/* $Id$ This file is part of the HandBrake source code. Homepage: . It may be used under the terms of the GNU General Public License. */ #include #include #include #include "hb.h" #include "hbffmpeg.h" #include "lang.h" #include "a52dec/a52.h" #include "mp4v2/mp4v2.h" #define min(a, b) a < b ? a : b /* * This table defines how ISO MPEG stream type codes map to HandBrake * codecs. It is indexed by the 8 bit stream type and contains the codec * worker object id and a parameter for that worker proc (ignored except * for the ffmpeg-based codecs in which case it is the ffmpeg codec id). * * Entries with a worker proc id of 0 or a kind of 'U' indicate that HB * doesn't handle the stream type. */ typedef struct { enum { N, U, A, V } kind; /* not handled / unknown / audio / video */ int codec; /* HB worker object id of codec */ int codec_param; /* param for codec (usually ffmpeg codec id) */ const char* name; /* description of type */ } stream2codec_t; #define st(id, kind, codec, codec_param, name) \ [id] = { kind, codec, codec_param, name } static const stream2codec_t st2codec[256] = { st(0x01, V, WORK_DECMPEG2, 0, "MPEG1"), st(0x02, V, WORK_DECMPEG2, 0, "MPEG2"), st(0x03, A, HB_ACODEC_MPGA, CODEC_ID_MP2, "MPEG1"), st(0x04, A, HB_ACODEC_MPGA, CODEC_ID_MP2, "MPEG2"), st(0x05, N, 0, 0, "ISO 13818-1 private section"), st(0x06, U, 0, 0, "ISO 13818-1 PES private data"), st(0x07, N, 0, 0, "ISO 13522 MHEG"), st(0x08, N, 0, 0, "ISO 13818-1 DSM-CC"), st(0x09, N, 0, 0, "ISO 13818-1 auxiliary"), st(0x0a, N, 0, 0, "ISO 13818-6 encap"), st(0x0b, N, 0, 0, "ISO 13818-6 DSM-CC U-N msgs"), st(0x0c, N, 0, 0, "ISO 13818-6 Stream descriptors"), st(0x0d, N, 0, 0, "ISO 13818-6 Sections"), st(0x0e, N, 0, 0, "ISO 13818-1 auxiliary"), st(0x0f, A, HB_ACODEC_MPGA, CODEC_ID_AAC, "ISO 13818-7 AAC Audio"), st(0x10, V, WORK_DECAVCODECV, CODEC_ID_MPEG4, "MPEG4"), st(0x11, A, HB_ACODEC_MPGA, CODEC_ID_AAC_LATM, "MPEG4 LATM AAC"), st(0x12, U, 0, 0, "MPEG4 generic"), st(0x14, N, 0, 0, "ISO 13818-6 DSM-CC download"), st(0x1b, V, WORK_DECAVCODECV, CODEC_ID_H264, "H.264"), st(0x80, N, 0, 0, "DigiCipher II Video"), st(0x81, A, HB_ACODEC_AC3, 0, "AC-3"), st(0x82, A, HB_ACODEC_DCA, 0, "HDMV DTS"), st(0x83, A, HB_ACODEC_LPCM, 0, "LPCM"), st(0x84, A, 0, 0, "SDDS"), st(0x85, U, 0, 0, "ATSC Program ID"), st(0x86, A, HB_ACODEC_DCA, 0, "DTS-HD"), st(0x87, A, 0, 0, "E-AC-3"), st(0x8a, A, HB_ACODEC_DCA, 0, "DTS"), st(0x91, A, HB_ACODEC_AC3, 0, "AC-3"), st(0x92, N, 0, 0, "Subtitle"), st(0x94, A, 0, 0, "SDDS"), st(0xa0, V, 0, 0, "MSCODEC"), st(0xea, V, WORK_DECAVCODECV, CODEC_ID_VC1, "VC1"), }; #undef st typedef enum { hb_stream_type_unknown = 0, transport, program, dvd_program, ffmpeg } hb_stream_type_t; #define kMaxNumberVideoPIDS 1 #define kMaxNumberAudioPIDS 31 #define kMaxNumberDecodeStreams (kMaxNumberVideoPIDS+kMaxNumberAudioPIDS) #define kMaxNumberPMTStreams 32 struct hb_stream_s { int frames; /* video frames so far */ int errors; /* total errors so far */ int last_error_frame; /* frame # at last error message */ int last_error_count; /* # errors at last error message */ int packetsize; /* Transport Stream packet size */ uint8_t need_keyframe; // non-zero if want to start at a keyframe uint8_t ts_found_pcr; // non-zero if we've found at least one input pcr int ts_pcr_out; // sequence number of most recent output pcr int ts_pcr_in; // sequence number of most recent input pcr int64_t ts_pcr; // most recent input pcr int64_t ts_pcrhist[4]; // circular buffer of output pcrs uint8_t *ts_packet; /* buffer for one TS packet */ hb_buffer_t *ts_buf[kMaxNumberDecodeStreams]; int ts_pos[kMaxNumberDecodeStreams]; int8_t ts_skipbad[kMaxNumberDecodeStreams]; int8_t ts_streamcont[kMaxNumberDecodeStreams]; uint8_t ts_pkt_summary[kMaxNumberDecodeStreams][8]; hb_buffer_t *fwrite_buf; /* PS buffer (set by hb_ts_stream_decode) */ int chapter; /* Chapter that we are currently in */ int64_t chapter_end; /* HB time that the current chapter ends */ /* * Stuff before this point is dynamic state updated as we read the * stream. Stuff after this point is stream description state that * we learn during the initial scan but cache so it can be * reused during the conversion read. */ uint8_t ts_number_video_pids; uint8_t ts_number_audio_pids; uint8_t ts_flags; // stream characteristics: #define TS_HAS_PCR (1 << 0) // at least one PCR seen #define TS_HAS_RAP (1 << 1) // Random Access Point bit seen #define TS_HAS_RSEI (1 << 2) // "Restart point" SEI seen uint8_t ts_IDRs; // # IDRs found during duration scan int16_t ts_video_pids[kMaxNumberVideoPIDS]; int16_t ts_audio_pids[kMaxNumberAudioPIDS]; uint32_t ts_format_id[kMaxNumberDecodeStreams]; #define TS_FORMAT_ID_AC3 (('A' << 24) | ('C' << 16) | ('-' << 8) | '3') uint8_t ts_stream_type[kMaxNumberDecodeStreams]; uint8_t ts_multiplexed[kMaxNumberDecodeStreams]; char *path; FILE *file_handle; hb_stream_type_t hb_stream_type; hb_title_t *title; AVFormatContext *ffmpeg_ic; AVPacket *ffmpeg_pkt; double ffmpeg_tsconv[MAX_STREAMS]; uint8_t ffmpeg_video_id; struct { int lang_code; int flags; int rate; int bitrate; } a52_info[kMaxNumberAudioPIDS]; struct { unsigned short program_number; unsigned short program_map_PID; } pat_info[kMaxNumberPMTStreams]; int ts_number_pat_entries; struct { int reading; unsigned char *tablebuf; unsigned int tablepos; unsigned char current_continuity_counter; int section_length; int program_number; unsigned int PCR_PID; int program_info_length; unsigned char *progam_info_descriptor_data; struct { unsigned char stream_type; unsigned short elementary_PID; unsigned short ES_info_length; unsigned char *es_info_descriptor_data; } pmt_stream_info[kMaxNumberPMTStreams]; } pmt_info; }; /*********************************************************************** * Local prototypes **********************************************************************/ static void hb_stream_duration(hb_stream_t *stream, hb_title_t *inTitle); static void hb_ts_stream_init(hb_stream_t *stream); static void hb_ts_stream_find_pids(hb_stream_t *stream); static int hb_ts_stream_decode(hb_stream_t *stream, hb_buffer_t *obuf); static void hb_ts_stream_reset(hb_stream_t *stream); static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream, int aud_pid_index); static void hb_ps_stream_find_audio_ids(hb_stream_t *stream, hb_title_t *title); static off_t align_to_next_packet(hb_stream_t *stream); static int ffmpeg_open( hb_stream_t *stream, hb_title_t *title ); static void ffmpeg_close( hb_stream_t *d ); static hb_title_t *ffmpeg_title_scan( hb_stream_t *stream ); static int ffmpeg_read( hb_stream_t *stream, hb_buffer_t *buf ); static int ffmpeg_seek( hb_stream_t *stream, float frac ); /* * streams have a bunch of state that's learned during the scan. We don't * want to throw away the state when scan does a close then relearn * everything when reader does an open. So we save the stream state on * the close following a scan and reuse it when 'reader' does an open. */ static hb_list_t *stream_state_list; static hb_stream_t *hb_stream_lookup( const char *path ) { if ( stream_state_list == NULL ) return NULL; hb_stream_t *ss; int i = 0; while ( ( ss = hb_list_item( stream_state_list, i++ ) ) != NULL ) { if ( strcmp( path, ss->path ) == 0 ) { break; } } return ss; } static void hb_stream_state_delete( hb_stream_t *ss ) { hb_list_rem( stream_state_list, ss ); free( ss->path ); free( ss ); } /* * logging routines. * these frontend hb_log because transport streams can have a lot of errors * so we want to rate limit messages. this routine limits the number of * messages to at most one per minute of video. other errors that occur * during the minute are counted & the count is output with the next * error msg we print. */ static void ts_warn_helper( hb_stream_t *stream, char *log, va_list args ) { // limit error printing to at most one per minute of video (at 30fps) ++stream->errors; if ( stream->frames - stream->last_error_frame >= 30*60 ) { char msg[256]; vsnprintf( msg, sizeof(msg), log, args ); if ( stream->errors - stream->last_error_count < 10 ) { hb_log( "stream: error near frame %d: %s", stream->frames, msg ); } else { int Edelta = stream->errors - stream->last_error_count; double Epcnt = (double)Edelta * 100. / (stream->frames - stream->last_error_frame); hb_log( "stream: %d new errors (%.0f%%) up to frame %d: %s", Edelta, Epcnt, stream->frames, msg ); } stream->last_error_frame = stream->frames; stream->last_error_count = stream->errors; } } static void ts_warn( hb_stream_t*, char*, ... ) HB_WPRINTF(2,3); static void ts_err( hb_stream_t*, int, char*, ... ) HB_WPRINTF(3,4); static void ts_warn( hb_stream_t *stream, char *log, ... ) { va_list args; va_start( args, log ); ts_warn_helper( stream, log, args ); va_end( args ); } static void ts_err( hb_stream_t *stream, int curstream, char *log, ... ) { va_list args; va_start( args, log ); ts_warn_helper( stream, log, args ); va_end( args ); stream->ts_skipbad[curstream] = 1; stream->ts_pos[curstream] = 0; stream->ts_streamcont[curstream] = -1; } static int check_ps_sync(const uint8_t *buf) { // a legal MPEG program stream must start with a Pack header in the // first four bytes. return (buf[0] == 0x00) && (buf[1] == 0x00) && (buf[2] == 0x01) && (buf[3] == 0xba); } static int check_ps_sc(const uint8_t *buf) { // a legal MPEG program stream must start with a Pack followed by a // some other start code. If we've already verified the pack, this skip // it and checks for a start code prefix. int pos = 14 + ( buf[13] & 0x7 ); // skip over the PACK return (buf[pos+0] == 0x00) && (buf[pos+1] == 0x00) && (buf[pos+2] == 0x01); } static int check_ts_sync(const uint8_t *buf) { // must have initial sync byte, no scrambling & a legal adaptation ctrl return (buf[0] == 0x47) && ((buf[3] >> 6) == 0) && ((buf[3] >> 4) > 0); } static int have_ts_sync(const uint8_t *buf, int psize) { return check_ts_sync(&buf[0*psize]) && check_ts_sync(&buf[1*psize]) && check_ts_sync(&buf[2*psize]) && check_ts_sync(&buf[3*psize]) && check_ts_sync(&buf[4*psize]) && check_ts_sync(&buf[5*psize]) && check_ts_sync(&buf[6*psize]) && check_ts_sync(&buf[7*psize]); } static int hb_stream_check_for_ts(const uint8_t *buf) { // transport streams should have a sync byte every 188 bytes. // search the first 8KB of buf looking for at least 8 consecutive // correctly located sync patterns. int offset = 0; for ( offset = 0; offset < 8*1024-8*188; ++offset ) { if ( have_ts_sync( &buf[offset], 188) ) return 188 | (offset << 8); if ( have_ts_sync( &buf[offset], 192) ) return 192 | (offset << 8); if ( have_ts_sync( &buf[offset], 204) ) return 204 | (offset << 8); if ( have_ts_sync( &buf[offset], 208) ) return 208 | (offset << 8); } return 0; } static int hb_stream_check_for_ps(const uint8_t *buf) { // program streams should start with a PACK then some other mpeg start // code (usually a SYS but that might be missing if we only have a clip). return check_ps_sync(buf) && check_ps_sc(buf); } static int hb_stream_check_for_dvd_ps(const uint8_t *buf) { // DVD program streams should have a Pack header every 2048 bytes. // check that we have 4 of these in a row. return check_ps_sync(&buf[0*2048]) && check_ps_sync(&buf[1*2048]) && check_ps_sync(&buf[2*2048]) && check_ps_sync(&buf[3*2048]); } static int hb_stream_get_type(hb_stream_t *stream) { uint8_t buf[2048*4]; if ( fread(buf, 1, sizeof(buf), stream->file_handle) == sizeof(buf) ) { int psize; if ( ( psize = hb_stream_check_for_ts(buf) ) != 0 ) { int offset = psize >> 8; psize &= 0xff; hb_log("file is MPEG Transport Stream with %d byte packets" " offset %d bytes", psize, offset); stream->packetsize = psize; stream->hb_stream_type = transport; hb_ts_stream_init(stream); if ( !stream->ts_number_video_pids || !stream->ts_number_audio_pids ) { return 0; } return 1; } if ( hb_stream_check_for_dvd_ps(buf) != 0 ) { hb_log("file is MPEG DVD Program Stream"); stream->hb_stream_type = dvd_program; return 1; } if ( hb_stream_check_for_ps(buf) != 0 ) { hb_log("file is MPEG Program Stream"); stream->hb_stream_type = program; return 1; } } return 0; } static void hb_stream_delete_dynamic( hb_stream_t *d ) { if( d->file_handle ) { fclose( d->file_handle ); d->file_handle = NULL; } int i=0; if ( d->ts_packet ) { free( d->ts_packet ); d->ts_packet = NULL; } for (i = 0; i < kMaxNumberDecodeStreams; i++) { if (d->ts_buf[i]) { hb_buffer_close(&(d->ts_buf[i])); d->ts_buf[i] = NULL; } } } static void hb_stream_delete( hb_stream_t *d ) { hb_stream_delete_dynamic( d ); free( d->path ); free( d ); } static int audio_inactive( hb_stream_t *stream, int indx ) { int aud_indx = indx - 1; if ( stream->ts_audio_pids[aud_indx] < 0 ) { // PID declared inactive by hb_stream_title_scan return 1; } if ( stream->ts_audio_pids[aud_indx] == stream->pmt_info.PCR_PID ) { // PCR PID is always active return 0; } // see if we should make the stream inactive because scan.c didn't // find a valid audio bitstream. int i; for ( i = 0; i < hb_list_count( stream->title->list_audio ); ++i ) { hb_audio_t *audio = hb_list_item( stream->title->list_audio, i ); if ( audio->id == indx ) { return 0; } } // not in the title's audio list - declare the PID inactive stream->ts_audio_pids[aud_indx] = -stream->ts_audio_pids[aud_indx]; return 1; } /*********************************************************************** * hb_stream_open *********************************************************************** * **********************************************************************/ hb_stream_t * hb_stream_open( char *path, hb_title_t *title ) { FILE *f = fopen( path, "rb" ); if ( f == NULL ) { hb_log( "hb_stream_open: open %s failed", path ); return NULL; } hb_stream_t *d = calloc( sizeof( hb_stream_t ), 1 ); if ( d == NULL ) { fclose( f ); hb_log( "hb_stream_open: can't allocate space for %s stream state", path ); return NULL; } /* * if we're opening the stream to read & convert, we need * the state we saved when we scanned the stream. if we're * opening the stream to scan it we want to rebuild the state * (even if we have saved state, the stream may have changed). */ hb_stream_t *ss = hb_stream_lookup( path ); if ( title && ss && ss->hb_stream_type != ffmpeg ) { /* * copy the saved state since we might be encoding the same stream * multiple times. */ memcpy( d, ss, sizeof(*d) ); d->file_handle = f; d->title = title; d->path = strdup( path ); if ( d->hb_stream_type == transport ) { d->ts_packet = malloc( d->packetsize ); int i = 0; for ( ; i < d->ts_number_video_pids + d->ts_number_audio_pids; i++) { if ( i && audio_inactive( d, i ) ) { // this PID isn't wanted (we don't have a codec for it // or scan didn't find audio parameters) continue; } d->ts_buf[i] = hb_buffer_init(d->packetsize); d->ts_buf[i]->size = 0; } hb_stream_seek( d, 0. ); } return d; } /* * opening for scan - delete any saved state then (re)scan the stream. * If it's something we can deal with (MPEG2 PS or TS) return a stream * reference structure & null otherwise. */ if ( ss != NULL ) { hb_stream_state_delete( ss ); } d->file_handle = f; d->title = title; d->path = strdup( path ); if (d->path != NULL ) { if ( hb_stream_get_type( d ) != 0 ) { return d; } fclose( d->file_handle ); d->file_handle = NULL; if ( ffmpeg_open( d, title ) ) { return d; } } if ( d->file_handle ) { fclose( d->file_handle ); } if (d->path) { free( d->path ); } hb_log( "hb_stream_open: open %s failed", path ); free( d ); return NULL; } /*********************************************************************** * hb_stream_close *********************************************************************** * Closes and frees everything **********************************************************************/ void hb_stream_close( hb_stream_t ** _d ) { hb_stream_t *stream = * _d; if ( stream->hb_stream_type == ffmpeg ) { ffmpeg_close( stream ); hb_stream_delete( stream ); *_d = NULL; return; } if ( stream->frames ) { hb_log( "stream: %d good frames, %d errors (%.0f%%)", stream->frames, stream->errors, (double)stream->errors * 100. / (double)stream->frames ); } /* * if the stream was opened for a scan, cache the result, otherwise delete * the state. */ if ( stream->title == NULL ) { hb_stream_delete_dynamic( stream ); if ( stream_state_list == NULL ) { stream_state_list = hb_list_init(); } hb_list_add( stream_state_list, stream ); } else { hb_stream_delete( stream ); } *_d = NULL; } /* when the file was first opened we made entries for all the audio elementary * streams we found in it. Streams that were later found during the preview scan * now have an audio codec, type, rate, etc., associated with them. At the end * of the scan we delete all the audio entries that weren't found by the scan * or don't have a format we support. This routine deletes audio entry 'indx' * by setting its PID to an invalid value so no packet will match it. (We can't * move any of the entries since the index of the entry is used as the id * of the media stream for HB. */ static void hb_stream_delete_audio_entry(hb_stream_t *stream, int indx) { if ( stream->ts_audio_pids[indx] > 0 ) { stream->ts_audio_pids[indx] = -stream->ts_audio_pids[indx]; } } static int index_of_pid(int pid, hb_stream_t *stream) { int i; if ( pid == stream->ts_video_pids[0] ) return 0; for ( i = 0; i < stream->ts_number_audio_pids; ++i ) if ( pid == stream->ts_audio_pids[i] ) return i + 1; return -1; } /*********************************************************************** * hb_ps_stream_title_scan *********************************************************************** * **********************************************************************/ hb_title_t * hb_stream_title_scan(hb_stream_t *stream) { if ( stream->hb_stream_type == ffmpeg ) return ffmpeg_title_scan( stream ); // 'Barebones Title' hb_title_t *aTitle = hb_title_init( stream->path, 0 ); aTitle->type = HB_STREAM_TYPE; aTitle->index = 1; // Copy part of the stream path to the title name char *sep = strrchr(stream->path, '/'); if (sep) strcpy(aTitle->name, sep+1); char *dot_term = strrchr(aTitle->name, '.'); if (dot_term) *dot_term = '\0'; // Height, width, rate and aspect ratio information is filled in when the previews are built hb_stream_duration(stream, aTitle); // One Chapter hb_chapter_t * chapter; chapter = calloc( sizeof( hb_chapter_t ), 1 ); chapter->index = 1; chapter->duration = aTitle->duration; chapter->hours = aTitle->hours; chapter->minutes = aTitle->minutes; chapter->seconds = aTitle->seconds; hb_list_add( aTitle->list_chapter, chapter ); // Figure out how many audio streams we really have: // - For transport streams, for each PID listed in the PMT (whether // or not it was an audio stream type) read the bitstream until we // find an packet from that PID containing a PES header and see if // the elementary stream is an audio type. // - For program streams read the first 4MB and take every unique // audio stream we find. if (stream->hb_stream_type == transport) { int i; for (i=0; i < stream->ts_number_audio_pids; i++) { hb_audio_t *audio = hb_ts_stream_set_audio_id_and_codec(stream, i); if (audio->config.in.codec) hb_list_add( aTitle->list_audio, audio ); else { free(audio); hb_stream_delete_audio_entry(stream, i); } } // make sure we're grabbing the PCR PID if ( index_of_pid( stream->pmt_info.PCR_PID, stream ) < 0 ) { stream->ts_audio_pids[stream->ts_number_audio_pids++] = stream->pmt_info.PCR_PID; } // set the video id, codec & muxer aTitle->video_id = 0; aTitle->video_codec = st2codec[stream->ts_stream_type[0]].codec; aTitle->video_codec_param = st2codec[stream->ts_stream_type[0]].codec_param; aTitle->demuxer = HB_MPEG2_TS_DEMUXER; if ( ( stream->ts_flags & TS_HAS_PCR ) == 0 ) { hb_log( "transport stream missing PCRs - using video DTS instead" ); } if ( stream->ts_IDRs < 1 ) { hb_log( "transport stream doesn't seem to have video IDR frames" ); aTitle->flags |= HBTF_NO_IDR; } } else { hb_ps_stream_find_audio_ids(stream, aTitle); } return aTitle; } /* * read the next transport stream packet from 'stream'. Return NULL if * we hit eof & a pointer to the sync byte otherwise. */ static const uint8_t *next_packet( hb_stream_t *stream ) { uint8_t *buf = stream->ts_packet + stream->packetsize - 188; while ( 1 ) { if ( fread(stream->ts_packet, 1, stream->packetsize, stream->file_handle) != stream->packetsize ) { return NULL; } if (buf[0] == 0x47) { return buf; } // lost sync - back up to where we started then try to re-establish. off_t pos = ftello(stream->file_handle) - stream->packetsize; off_t pos2 = align_to_next_packet(stream); if ( pos2 == 0 ) { hb_log( "next_packet: eof while re-establishing sync @ %"PRId64, pos ); return NULL; } ts_warn( stream, "next_packet: sync lost @ %"PRId64", regained after %"PRId64" bytes", pos, pos2 ); } } /* * skip to the start of the next PACK header in program stream src_stream. */ static void skip_to_next_pack( hb_stream_t *src_stream ) { // scan forward until we find the start of the next pack uint32_t strt_code = -1; int c; flockfile( src_stream->file_handle ); while ( ( c = getc_unlocked( src_stream->file_handle ) ) != EOF ) { strt_code = ( strt_code << 8 ) | c; if ( strt_code == 0x000001ba ) // we found the start of the next pack break; } funlockfile( src_stream->file_handle ); // if we didn't terminate on an eof back up so the next read // starts on the pack boundary. if ( c != EOF ) { fseeko( src_stream->file_handle, -4, SEEK_CUR ); } } static int isIframe( hb_stream_t *stream, const uint8_t *buf, int adapt_len ) { // For mpeg2: look for a gop start or i-frame picture start // for h.264: look for idr nal type or a slice header for an i-frame // for vc1: look for a Sequence header int i; uint32_t strid = 0; if ( stream->ts_stream_type[0] <= 2 ) { // This section of the code handles MPEG-1 and MPEG-2 video streams for (i = 13 + adapt_len; i < 188; i++) { strid = (strid << 8) | buf[i]; if ( ( strid >> 8 ) == 1 ) { // we found a start code uint8_t id = strid; switch ( id ) { case 0xB8: // group_start_code (GOP header) case 0xB3: // sequence_header code return 1; case 0x00: // picture_start_code // picture_header, let's see if it's an I-frame if (i<185) { // check if picture_coding_type == 1 if ((buf[i+2] & (0x7 << 3)) == (1 << 3)) { // found an I-frame picture return 1; } } break; } } } // didn't find an I-frame return 0; } if ( stream->ts_stream_type[0] == 0x1b ) { // we have an h.264 stream for (i = 13 + adapt_len; i < 188; i++) { strid = (strid << 8) | buf[i]; if ( ( strid >> 8 ) == 1 ) { // we found a start code - remove the ref_idc from the nal type uint8_t nal_type = strid & 0x1f; if ( nal_type == 0x05 ) // h.264 IDR picture start return 1; } } // didn't find an I-frame return 0; } if ( stream->ts_stream_type[0] == 0xea ) { // we have an vc1 stream for (i = 13 + adapt_len; i < 188; i++) { strid = (strid << 8) | buf[i]; if ( strid == 0x10f ) { // the ffmpeg vc1 decoder requires a seq hdr code in the first // frame. return 1; } } // didn't find an I-frame return 0; } // we don't understand the stream type so just say "yes" otherwise // we'll discard all the video. return 1; } /* * scan the next MB of 'stream' to find the next start packet for * the Packetized Elementary Stream associated with TS PID 'pid'. */ static const uint8_t *hb_ts_stream_getPEStype(hb_stream_t *stream, uint32_t pid) { int npack = 300000; // max packets to read while (--npack >= 0) { const uint8_t *buf = next_packet( stream ); if ( buf == NULL ) { hb_log("hb_ts_stream_getPEStype: EOF while searching for PID 0x%x", pid); return 0; } // while we're reading the stream, check if it has valid PCRs // and/or random access points. uint32_t pack_pid = ( (buf[1] & 0x1f) << 8 ) | buf[2]; if ( pack_pid == stream->pmt_info.PCR_PID ) { if ( ( buf[5] & 0x10 ) && ( ( ( buf[3] & 0x30 ) == 0x20 ) || ( ( buf[3] & 0x30 ) == 0x30 && buf[4] > 6 ) ) ) { stream->ts_flags |= TS_HAS_PCR; } } if ( buf[5] & 0x40 ) { stream->ts_flags |= TS_HAS_RAP; } /* * The PES header is only in TS packets with 'start' set so we check * that first then check for the right PID. */ if ((buf[1] & 0x40) == 0 || pack_pid != pid ) { // not a start packet or not the pid we want continue; } /* skip over the TS hdr to return a pointer to the PES hdr */ int udata = 4; switch (buf[3] & 0x30) { case 0x00: // illegal case 0x20: // fill packet continue; case 0x30: // adaptation if (buf[4] > 182) { hb_log("hb_ts_stream_getPEStype: invalid adaptation field length %d for PID 0x%x", buf[4], pid); continue; } udata += buf[4] + 1; break; } /* PES hdr has to begin with an mpeg start code */ if (buf[udata+0] == 0x00 && buf[udata+1] == 0x00 && buf[udata+2] == 0x01) { return &buf[udata]; } } /* didn't find it */ return 0; } static uint64_t hb_ps_stream_getVideoPTS(hb_stream_t *stream) { hb_buffer_t *buf = hb_buffer_init(HB_DVD_READ_BUFFER_SIZE); hb_list_t *list = hb_list_init(); // how many blocks we read while searching for a video PES header int blksleft = 1024; uint64_t pts = 0; while (--blksleft >= 0 && hb_stream_read(stream, buf) == 1) { hb_buffer_t *es; // 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams hb_demux_ps( buf, list, 0 ); while ( ( es = hb_list_item( list, 0 ) ) ) { hb_list_rem( list, es ); if ( es->id == 0xe0 ) { // this PES contains video - if there's a PTS we're done // hb_demux_ps left the PTS in buf_es->start. if ( es->start != ~0 ) { pts = es->start; blksleft = 0; break; } } hb_buffer_close( &es ); } } hb_list_empty( &list ); hb_buffer_close(&buf); return pts; } /*********************************************************************** * hb_stream_duration *********************************************************************** * * Finding stream duration is difficult. One issue is that the video file * may have chunks from several different program fragments (main feature, * commercials, station id, trailers, etc.) all with their own base pts * value. We can't find the piece boundaries without reading the entire * file but if we compute a rate based on time stamps from two different * pieces the result will be meaningless. The second issue is that the * data rate of compressed video normally varies by 5-10x over the length * of the video. This says that we want to compute the rate over relatively * long segments to get a representative average but long segments increase * the likelihood that we'll cross a piece boundary. * * What we do is take time stamp samples at several places in the file * (currently 16) then compute the average rate (i.e., ticks of video per * byte of the file) for all pairs of samples (N^2 rates computed for N * samples). Some of those rates will be absurd because the samples came * from different segments. Some will be way low or high because the * samples came from a low or high motion part of the segment. But given * that we're comparing *all* pairs the majority of the computed rates * should be near the overall average. So we median filter the computed * rates to pick the most representative value. * **********************************************************************/ struct pts_pos { uint64_t pos; /* file position of this PTS sample */ uint64_t pts; /* PTS from video stream */ }; #define NDURSAMPLES 128 // get one (position, timestamp) sampple from a transport or program // stream. static struct pts_pos hb_sample_pts(hb_stream_t *stream, uint64_t fpos) { struct pts_pos pp = { 0, 0 }; if ( stream->hb_stream_type == transport ) { const uint8_t *buf; fseeko( stream->file_handle, fpos, SEEK_SET ); align_to_next_packet( stream ); buf = hb_ts_stream_getPEStype( stream, stream->ts_video_pids[0] ); if ( buf == NULL ) { hb_log("hb_sample_pts: couldn't find video packet near %"PRIu64, fpos); return pp; } if ( ( buf[7] >> 7 ) != 1 ) { hb_log("hb_sample_pts: no PTS in video packet near %"PRIu64, fpos); return pp; } pp.pts = ( ( (uint64_t)buf[9] >> 1 ) & 7 << 30 ) | ( (uint64_t)buf[10] << 22 ) | ( ( (uint64_t)buf[11] >> 1 ) << 15 ) | ( (uint64_t)buf[12] << 7 ) | ( (uint64_t)buf[13] >> 1 ); if ( isIframe( stream, buf, -4 ) ) { if ( stream->ts_IDRs < 255 ) { ++stream->ts_IDRs; } } } else { // round address down to nearest dvd sector start fpos &=~ ( HB_DVD_READ_BUFFER_SIZE - 1 ); fseeko( stream->file_handle, fpos, SEEK_SET ); if ( stream->hb_stream_type == program ) { skip_to_next_pack( stream ); } pp.pts = hb_ps_stream_getVideoPTS( stream ); } pp.pos = ftello(stream->file_handle); return pp; } static int dur_compare( const void *a, const void *b ) { const double *aval = a, *bval = b; return ( *aval < *bval ? -1 : ( *aval == *bval ? 0 : 1 ) ); } // given an array of (position, time) samples, compute a max-likelihood // estimate of the average rate by computing the rate between all pairs // of samples then taking the median of those rates. static double compute_stream_rate( struct pts_pos *pp, int n ) { int i, j; double rates[NDURSAMPLES * NDURSAMPLES / 8]; double *rp = rates; // the following nested loops compute the rates between all pairs. *rp = 0; for ( i = 0; i < n-1; ++i ) { // Bias the median filter by not including pairs that are "far" // from one another. This is to handle cases where the file is // made of roughly equal size pieces where a symmetric choice of // pairs results in having the same number of intra-piece & // inter-piece rate estimates. This would mean that the median // could easily fall in the inter-piece part of the data which // would give a bogus estimate. The 'ns' index creates an // asymmetry that favors locality. int ns = i + ( n >> 3 ); if ( ns > n ) ns = n; for ( j = i+1; j < ns; ++j ) { if ( (uint64_t)(pp[j].pts - pp[i].pts) > 90000LL*3600*6 ) break; if ( pp[j].pts != pp[i].pts && pp[j].pos > pp[i].pos ) { *rp = ((double)( pp[j].pts - pp[i].pts )) / ((double)( pp[j].pos - pp[i].pos )); ++rp; } } } // now compute and return the median of all the (n*n/2) rates we computed // above. int nrates = rp - rates; qsort( rates, nrates, sizeof (rates[0] ), dur_compare ); return rates[nrates >> 1]; } static void hb_stream_duration(hb_stream_t *stream, hb_title_t *inTitle) { struct pts_pos ptspos[NDURSAMPLES]; struct pts_pos *pp = ptspos; int i; fseeko(stream->file_handle, 0, SEEK_END); uint64_t fsize = ftello(stream->file_handle); uint64_t fincr = fsize / NDURSAMPLES; uint64_t fpos = fincr / 2; for ( i = NDURSAMPLES; --i >= 0; fpos += fincr ) { *pp++ = hb_sample_pts(stream, fpos); } uint64_t dur = compute_stream_rate( ptspos, pp - ptspos ) * (double)fsize; inTitle->duration = dur; dur /= 90000; inTitle->hours = dur / 3600; inTitle->minutes = ( dur % 3600 ) / 60; inTitle->seconds = dur % 60; rewind(stream->file_handle); } /*********************************************************************** * hb_stream_read *********************************************************************** * **********************************************************************/ int hb_stream_read( hb_stream_t * src_stream, hb_buffer_t * b ) { if ( src_stream->hb_stream_type == ffmpeg ) { return ffmpeg_read( src_stream, b ); } if ( src_stream->hb_stream_type == dvd_program ) { size_t amt_read = fread(b->data, HB_DVD_READ_BUFFER_SIZE, 1, src_stream->file_handle); return (amt_read > 0); } if ( src_stream->hb_stream_type == program ) { // a general program stream has arbitrary sized pack's. we're // currently positioned at the start of a pack so read up to but // not including the start of the next, expanding the buffer // as necessary. uint8_t *cp = b->data; uint8_t *ep = cp + b->alloc; uint32_t strt_code = -1; int c; // consume the first byte of the initial pack so we don't match on // it in the loop below. if ( ( c = getc( src_stream->file_handle ) ) == EOF ) return 0; *cp++ = c; flockfile( src_stream->file_handle ); while ( ( c = getc_unlocked( src_stream->file_handle ) ) != EOF ) { strt_code = ( strt_code << 8 ) | c; if ( strt_code == 0x000001ba ) // we found the start of the next pack break; if ( cp >= ep ) { // need to expand the buffer int curSize = cp - b->data; hb_buffer_realloc( b, curSize * 2 ); cp = b->data + curSize; ep = b->data + b->alloc; } *cp++ = c; } funlockfile( src_stream->file_handle ); // if we didn't terminate on an eof back up so the next read // starts on the pack boundary. b->size = cp - b->data; if ( c != EOF ) { fseeko( src_stream->file_handle, -4, SEEK_CUR ); b->size -= 4; } return 1; } return hb_ts_stream_decode( src_stream, b ); } int hb_stream_seek_chapter( hb_stream_t * stream, int chapter_num ) { if ( stream->hb_stream_type != ffmpeg ) { // currently meaningliess for transport and program streams return 1; } if ( !stream || !stream->title || chapter_num > hb_list_count( stream->title->list_chapter ) ) { return 0; } int64_t sum_dur = 0; hb_chapter_t *chapter = NULL; int i; for ( i = 0; i < chapter_num; ++i) { chapter = hb_list_item( stream->title->list_chapter, i ); sum_dur += chapter->duration; } stream->chapter = chapter_num - 1; stream->chapter_end = sum_dur; int64_t pos = ( ( ( sum_dur - chapter->duration ) * AV_TIME_BASE ) / 90000 ); hb_deep_log( 2, "Seeking to chapter %d: starts %"PRId64", ends %"PRId64", AV pos %"PRId64, chapter_num, sum_dur - chapter->duration, sum_dur, pos); if ( chapter_num > 1 && pos > 0 ) { av_seek_frame( stream->ffmpeg_ic, -1, pos, 0); } return 1; } /*********************************************************************** * hb_stream_chapter *********************************************************************** * Return the number of the chapter that we are currently in. We store * the chapter number starting from 0, so + 1 for the real chpater num. **********************************************************************/ int hb_stream_chapter( hb_stream_t * src_stream ) { return( src_stream->chapter + 1 ); } /*********************************************************************** * hb_stream_seek *********************************************************************** * **********************************************************************/ int hb_stream_seek( hb_stream_t * stream, float f ) { if ( stream->hb_stream_type == ffmpeg ) { return ffmpeg_seek( stream, f ); } off_t stream_size, cur_pos, new_pos; double pos_ratio = f; cur_pos = ftello( stream->file_handle ); fseeko( stream->file_handle, 0, SEEK_END ); stream_size = ftello( stream->file_handle ); new_pos = (off_t) ((double) (stream_size) * pos_ratio); new_pos &=~ (HB_DVD_READ_BUFFER_SIZE - 1); int r = fseeko( stream->file_handle, new_pos, SEEK_SET ); if (r == -1) { fseeko( stream->file_handle, cur_pos, SEEK_SET ); return 0; } if ( stream->hb_stream_type == transport ) { // We need to drop the current decoder output and move // forwards to the next transport stream packet. hb_ts_stream_reset(stream); if ( f > 0 ) { if ( stream->ts_IDRs ) { // the stream has IDRs so look for one. stream->need_keyframe = 1; } } else { // we're at the beginning - say we have video sync so that we // won't drop initial SPS & PPS data on an AVC stream. stream->need_keyframe = 0; } } else if ( stream->hb_stream_type == program ) { skip_to_next_pack( stream ); } return 1; } static const char* make_upper( const char* s ) { static char name[8]; char *cp = name; char *ep = cp + sizeof(name)-1; while ( *s && cp < ep ) { *cp++ = islower(*s)? toupper(*s) : *s; ++s; } *cp = 0; return name; } static void set_audio_description( hb_audio_t *audio, iso639_lang_t *lang ) { /* XXX * This is a duplicate of code in dvd.c - it should get factored out * into a common routine. We probably should only be putting the lang * code or a lang pointer into the audio config & let the common description * formatting routine in scan.c do all the stuff below. */ const char *codec_name; AVCodecContext *cc; if ( audio->config.in.codec == HB_ACODEC_FFMPEG && ( cc = hb_ffmpeg_context( audio->config.in.codec_param ) ) && avcodec_find_decoder( cc->codec_id ) ) { codec_name = make_upper( avcodec_find_decoder( cc->codec_id )->name ); if ( !strcmp( codec_name, "LIBFAAD" ) ) { codec_name = "AAC"; } } else if ( audio->config.in.codec == HB_ACODEC_MPGA && avcodec_find_decoder( audio->config.in.codec_param ) ) { codec_name = avcodec_find_decoder( audio->config.in.codec_param )->name; } else { codec_name = audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" : audio->config.in.codec == HB_ACODEC_DCA ? "DTS" : audio->config.in.codec == HB_ACODEC_MPGA ? "MPEG" : audio->config.in.codec == HB_ACODEC_LPCM ? "LPCM" : audio->config.in.codec == HB_ACODEC_FFMPEG ? "FFMPEG" : "Unknown"; } snprintf( audio->config.lang.description, sizeof( audio->config.lang.description ), "%s (%s)", strlen(lang->native_name) ? lang->native_name : lang->eng_name, codec_name ); snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s", strlen(lang->native_name) ? lang->native_name : lang->eng_name ); snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ), "%s", lang->iso639_2); } static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream, int aud_pid_index) { off_t cur_pos = ftello(stream->file_handle); hb_audio_t *audio = calloc( sizeof( hb_audio_t ), 1 ); const uint8_t *buf; fseeko(stream->file_handle, 0, SEEK_SET); align_to_next_packet(stream); buf = hb_ts_stream_getPEStype(stream, stream->ts_audio_pids[aud_pid_index]); /* check that we found a PES header */ uint8_t stype = 0; if (buf && buf[0] == 0x00 && buf[1] == 0x00 && buf[2] == 0x01) { stype = stream->ts_stream_type[1 + aud_pid_index]; // 0xbd ("private stream 1") is the normal container for non-ISO // media - AC3/DCA/PCM/etc. if ( buf[3] == 0xbd ) { if ( st2codec[stype].kind == U ) { // XXX assume unknown stream types are AC-3 (if they're not // audio we'll find that out during the scan but if they're // some other type of audio we'll end up ignoring them). stype = 0x81; stream->ts_stream_type[1 + aud_pid_index] = 0x81; } } else if ( buf[3] == 0xfd ) { // 0xfd indicates an extended stream id (ISO 13818-1(2007)). // the blu ray consortium apparently forgot to read the portion // of the MPEG spec that says one PID should map to one media // stream and multiplexed multiple types of audio into one PID // using the extended stream identifier of the PES header to // distinguish them. So we have to check if that's happening and // if so tell the runtime what esid we want. if ( st2codec[stype].kind == A && stype == 0x83 && stream->ts_format_id[1 + aud_pid_index] == TS_FORMAT_ID_AC3 ) { // This is an interleaved TrueHD/AC-3 stream and the esid of // the AC-3 is 0x76 stream->ts_multiplexed[1 + aud_pid_index] = 0x76; stype = 0x81; stream->ts_stream_type[1 + aud_pid_index] = 0x81; } if ( st2codec[stype].kind == A && stype == 0x86 ) { // This is an interleaved DTS-HD/DTS stream and the esid of // the DTS is 0x71 stream->ts_multiplexed[1 + aud_pid_index] = 0x71; stype = 0x82; stream->ts_stream_type[1 + aud_pid_index] = 0x82; } } else if ((buf[3] & 0xe0) == 0xc0) { // 0xC0 - 0xCF are the normal containers for ISO-standard // media (mpeg2 audio and mpeg4 AAC). if ( st2codec[stype].kind == U ) { // XXX assume unknown stream types are MPEG audio stype = 0x03; stream->ts_stream_type[1 + aud_pid_index] = 0x03; } } else { stype = 0; } } // if we found an audio stream type & HB has a codec that can decode it // finish configuring the audio so we'll add it to the title's list. if ( st2codec[stype].kind == A && st2codec[stype].codec ) { audio->id = 1 + aud_pid_index; audio->config.in.codec = st2codec[stype].codec; audio->config.in.codec_param = st2codec[stype].codec_param; set_audio_description( audio, lang_for_code( stream->a52_info[aud_pid_index].lang_code ) ); hb_log("transport stream pid 0x%x (type 0x%x) may be %s audio (id 0x%x)", stream->ts_audio_pids[aud_pid_index], stype, st2codec[stype].name, audio->id); } else { if ( buf ) { hb_log("transport stream pid 0x%x (type 0x%x, substream 0x%x) " "isn't audio", stream->ts_audio_pids[aud_pid_index], stream->ts_stream_type[1 + aud_pid_index], buf[3]); } else { hb_log("transport stream pid 0x%x (type 0x%x) isn't audio", stream->ts_audio_pids[aud_pid_index], stream->ts_stream_type[1 + aud_pid_index]); } } fseeko(stream->file_handle, cur_pos, SEEK_SET); return audio; } static void add_audio_to_title(hb_title_t *title, int id) { hb_audio_t *audio = calloc( sizeof( hb_audio_t ), 1 ); audio->id = id; switch ( id >> 12 ) { case 0x0: audio->config.in.codec = HB_ACODEC_MPGA; hb_log("add_audio_to_title: added MPEG audio stream 0x%x", id); break; case 0x2: // type 2 is a DVD subtitle stream - just ignore it */ free( audio ); return; case 0x8: audio->config.in.codec = HB_ACODEC_AC3; hb_log("add_audio_to_title: added AC3 audio stream 0x%x", id); break; case 0xa: audio->config.in.codec = HB_ACODEC_LPCM; hb_log("add_audio_to_title: added LPCM audio stream 0x%x", id); break; default: hb_log("add_audio_to_title: unknown audio stream type 0x%x", id); free( audio ); return; } set_audio_description( audio, lang_for_code( 0 ) ); hb_list_add( title->list_audio, audio ); } static void hb_ps_stream_find_audio_ids(hb_stream_t *stream, hb_title_t *title) { off_t cur_pos = ftello(stream->file_handle); hb_buffer_t *buf = hb_buffer_init(HB_DVD_READ_BUFFER_SIZE); hb_list_t *list = hb_list_init(); // how many blocks we read while searching for audio streams int blksleft = 4096; // there can be at most 16 unique streams in an MPEG PS (8 in a DVD) // so we use a bitmap to keep track of the ones we've already seen. // Bit 'i' of smap is set if we've already added the audio for // audio substream id 'i' to the title's audio list. uint32_t smap = 0; // start looking 20% into the file since there's occasionally no // audio at the beginning (particularly for vobs). hb_stream_seek(stream, 0.2f); while (--blksleft >= 0 && hb_stream_read(stream, buf) == 1) { hb_buffer_t *es; // 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams hb_demux_ps( buf, list, 0 ); while ( ( es = hb_list_item( list, 0 ) ) ) { hb_list_rem( list, es ); if ( (es->id & 0xff) == 0xbd || (es->id & 0xe0) == 0xc0 ) { // this PES contains some kind of audio - get the substream id // and check if we've seen it already. int ssid = (es->id > 0xff ? es->id >> 8 : es->id) & 0xf; if ( (smap & (1 << ssid)) == 0 ) { // we haven't seen this stream before - add it to the // title's list of audio streams. smap |= (1 << ssid); add_audio_to_title(title, es->id); } } hb_buffer_close( &es ); } } hb_list_empty( &list ); hb_buffer_close(&buf); fseeko(stream->file_handle, cur_pos, SEEK_SET); } /*********************************************************************** * hb_ts_stream_init *********************************************************************** * **********************************************************************/ static void hb_ts_stream_init(hb_stream_t *stream) { int i; for (i=0; i < kMaxNumberDecodeStreams; i++) { stream->ts_streamcont[i] = -1; } stream->ts_video_pids[0] = -1; for ( i = 0; i < stream->ts_number_audio_pids; i++ ) { stream-> ts_audio_pids[i] = -1; } stream->ts_packet = malloc( stream->packetsize ); // Find the audio and video pids in the stream hb_ts_stream_find_pids(stream); for (i = 0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++) { // demuxing buffer for TS to PS conversion stream->ts_buf[i] = hb_buffer_init(stream->packetsize); stream->ts_buf[i]->size = 0; } } #define MAX_HOLE 208*80 static off_t align_to_next_packet(hb_stream_t *stream) { uint8_t buf[MAX_HOLE]; off_t pos = 0; off_t start = ftello(stream->file_handle); if ( start >= stream->packetsize ) { start -= stream->packetsize; fseeko(stream->file_handle, start, SEEK_SET); } if (fread(buf, sizeof(buf), 1, stream->file_handle) == 1) { const uint8_t *bp = buf; int i; for ( i = sizeof(buf); --i >= 0; ++bp ) { if ( have_ts_sync( bp, stream->packetsize ) ) { break; } } if ( i >= 0 ) { pos = ( bp - buf ) - stream->packetsize + 188; if ( pos < 0 ) pos = 0; } } fseeko(stream->file_handle, start+pos, SEEK_SET); return pos; } typedef struct { uint8_t *buf; uint32_t val; int pos; } bitbuf_t; static const unsigned int bitmask[] = { 0x0,0x1,0x3,0x7,0xf,0x1f,0x3f,0x7f,0xff, 0x1ff,0x3ff,0x7ff,0xfff,0x1fff,0x3fff,0x7fff,0xffff, 0x1ffff,0x3ffff,0x7ffff,0xfffff,0x1fffff,0x3fffff,0x7fffff,0xffffff, 0x1ffffff,0x3ffffff,0x7ffffff,0xfffffff,0x1fffffff,0x3fffffff,0x7fffffff,0xffffffff}; static inline void set_buf(bitbuf_t *bb, uint8_t* buf, int bufsize, int clear) { bb->pos = 0; bb->buf = buf; bb->val = (bb->buf[0] << 24) | (bb->buf[1] << 16) | (bb->buf[2] << 8) | bb->buf[3]; if (clear) memset(bb->buf, 0, bufsize); } static inline int buf_size(bitbuf_t *bb) { return bb->pos >> 3; } static inline unsigned int get_bits(bitbuf_t *bb, int bits) { unsigned int val; int left = 32 - (bb->pos & 31); if (bits < left) { val = (bb->val >> (left - bits)) & bitmask[bits]; bb->pos += bits; } else { val = (bb->val & bitmask[left]) << (bits - left); bb->pos += left; bits -= left; int pos = bb->pos >> 3; bb->val = (bb->buf[pos] << 24) | (bb->buf[pos + 1] << 16) | (bb->buf[pos + 2] << 8) | bb->buf[pos + 3]; if (bits > 0) { val |= (bb->val >> (32 - bits)) & bitmask[bits]; bb->pos += bits; } } return val; } // extract what useful information we can from the elementary stream // descriptor list at 'dp' and add it to the stream at 'esindx'. // Descriptors with info we don't currently use are ignored. // The descriptor list & descriptor item formats are defined in // ISO 13818-1 (2000E) section 2.6 (pg. 62). static void decode_element_descriptors(hb_stream_t* stream, int esindx, const uint8_t *dp, uint8_t dlen) { const uint8_t *ep = dp + dlen; while (dp < ep) { switch (dp[0]) { case 5: // Registration descriptor stream->ts_format_id[esindx+1] = (dp[2] << 24) | (dp[3] << 16) | (dp[4] << 8) | dp[5]; break; case 10: // ISO_639_language descriptor stream->a52_info[esindx].lang_code = lang_to_code(lang_for_code2((const char *)&dp[2])); break; case 0x6a: // DVB AC-3 descriptor stream->ts_stream_type[esindx+1] = 0x81; break; default: break; } dp += dp[1] + 2; } } static const char *stream_type_name (uint8_t stream_type) { return st2codec[stream_type].name? st2codec[stream_type].name : "Unknown"; } int decode_program_map(hb_stream_t* stream) { bitbuf_t bb; set_buf(&bb, stream->pmt_info.tablebuf, stream->pmt_info.tablepos, 0); get_bits(&bb, 8); // table_id get_bits(&bb, 4); unsigned int section_length = get_bits(&bb, 12); stream->pmt_info.section_length = section_length; unsigned int program_number = get_bits(&bb, 16); stream->pmt_info.program_number = program_number; get_bits(&bb, 2); get_bits(&bb, 5); // version_number get_bits(&bb, 1); get_bits(&bb, 8); // section_number get_bits(&bb, 8); // last_section_number get_bits(&bb, 3); unsigned int PCR_PID = get_bits(&bb, 13); stream->pmt_info.PCR_PID = PCR_PID; get_bits(&bb, 4); unsigned int program_info_length = get_bits(&bb, 12); stream->pmt_info.program_info_length = program_info_length; int i=0; unsigned char *descriptor_buf = (unsigned char *) malloc(program_info_length); for (i = 0; i < program_info_length; i++) { descriptor_buf[i] = get_bits(&bb, 8); } int cur_pos = 9 /* data after the section length field*/ + program_info_length; int done_reading_stream_types = 0; while (!done_reading_stream_types) { unsigned char stream_type = get_bits(&bb, 8); get_bits(&bb, 3); unsigned int elementary_PID = get_bits(&bb, 13); get_bits(&bb, 4); unsigned int ES_info_length = get_bits(&bb, 12); int i=0; unsigned char *ES_info_buf = (unsigned char *) malloc(ES_info_length); for (i=0; i < ES_info_length; i++) { ES_info_buf[i] = get_bits(&bb, 8); } if ( index_of_pid( elementary_PID, stream ) < 0 ) { // don't have this pid yet if (stream->ts_number_video_pids == 0 && st2codec[stream_type].kind == V ) { stream->ts_video_pids[0] = elementary_PID; stream->ts_stream_type[0] = stream_type; stream->ts_number_video_pids = 1; } else { // Defined audio stream types are 0x81 for AC-3/A52 audio // and 0x03 for mpeg audio. But content producers seem to // use other values (0x04 and 0x06 have both been observed) // so at this point we say everything that isn't a video // pid is audio then at the end of hb_stream_title_scan // we'll figure out which are really audio by looking at // the PES headers. i = stream->ts_number_audio_pids; if (i < kMaxNumberAudioPIDS) { stream->ts_audio_pids[i] = elementary_PID; stream->ts_stream_type[1 + i] = stream_type; if (ES_info_length > 0) { decode_element_descriptors(stream, i, ES_info_buf, ES_info_length); } ++stream->ts_number_audio_pids; } } } cur_pos += 5 /* stream header */ + ES_info_length; free(ES_info_buf); if (cur_pos >= section_length - 4 /* stop before the CRC */) done_reading_stream_types = 1; } free(descriptor_buf); return 1; } static int build_program_map(const uint8_t *buf, hb_stream_t *stream) { // Get adaption header info int adapt_len = 0; int adaption = (buf[3] & 0x30) >> 4; if (adaption == 0) return 0; else if (adaption == 0x2) adapt_len = 184; else if (adaption == 0x3) adapt_len = buf[4] + 1; if (adapt_len > 184) return 0; // Get payload start indicator int start; start = (buf[1] & 0x40) != 0; // Get pointer length - only valid in packets with a start flag int pointer_len = 0; if (start) { pointer_len = buf[4 + adapt_len] + 1; stream->pmt_info.tablepos = 0; } // Get Continuity Counter int continuity_counter = buf[3] & 0x0f; if (!start && (stream->pmt_info.current_continuity_counter + 1 != continuity_counter)) { hb_log("build_program_map - Continuity Counter %d out of sequence - expected %d", continuity_counter, stream->pmt_info.current_continuity_counter+1); return 0; } stream->pmt_info.current_continuity_counter = continuity_counter; stream->pmt_info.reading |= start; // Add the payload for this packet to the current buffer int amount_to_copy = 184 - adapt_len - pointer_len; if (stream->pmt_info.reading && (amount_to_copy > 0)) { stream->pmt_info.tablebuf = realloc(stream->pmt_info.tablebuf, stream->pmt_info.tablepos + amount_to_copy); memcpy(stream->pmt_info.tablebuf + stream->pmt_info.tablepos, buf + 4 + adapt_len + pointer_len, amount_to_copy); stream->pmt_info.tablepos += amount_to_copy; } if (stream->pmt_info.tablepos > 3) { // We have enough to check the section length int length; length = ((stream->pmt_info.tablebuf[1] << 8) + stream->pmt_info.tablebuf[2]) & 0xFFF; if (stream->pmt_info.tablepos > length + 1) { // We just finished a bunch of packets - parse the program map details int decode_ok = 0; if (stream->pmt_info.tablebuf[0] == 0x02) decode_ok = decode_program_map(stream); free(stream->pmt_info.tablebuf); stream->pmt_info.tablebuf = NULL; stream->pmt_info.tablepos = 0; stream->pmt_info.reading = 0; if (decode_ok) return decode_ok; } } return 0; } static int decode_PAT(const uint8_t *buf, hb_stream_t *stream) { unsigned char tablebuf[1024]; unsigned int tablepos = 0; int reading = 0; // Get adaption header info int adapt_len = 0; int adaption = (buf[3] & 0x30) >> 4; if (adaption == 0) return 0; else if (adaption == 0x2) adapt_len = 184; else if (adaption == 0x3) adapt_len = buf[4] + 1; if (adapt_len > 184) return 0; // Get pointer length int pointer_len = buf[4 + adapt_len] + 1; // Get payload start indicator int start; start = (buf[1] & 0x40) != 0; if (start) reading = 1; // Add the payload for this packet to the current buffer if (reading && (184 - adapt_len) > 0) { if (tablepos + 184 - adapt_len - pointer_len > 1024) { hb_log("decode_PAT - Bad program section length (> 1024)"); return 0; } memcpy(tablebuf + tablepos, buf + 4 + adapt_len + pointer_len, 184 - adapt_len - pointer_len); tablepos += 184 - adapt_len - pointer_len; } if (start && reading) { memcpy(tablebuf + tablepos, buf + 4 + adapt_len + 1, pointer_len - 1); unsigned int pos = 0; //while (pos < tablepos) { bitbuf_t bb; set_buf(&bb, tablebuf + pos, tablepos - pos, 0); unsigned char section_id = get_bits(&bb, 8); get_bits(&bb, 4); unsigned int section_len = get_bits(&bb, 12); get_bits(&bb, 16); // transport_id get_bits(&bb, 2); get_bits(&bb, 5); // version_num get_bits(&bb, 1); // current_next get_bits(&bb, 8); // section_num get_bits(&bb, 8); // last_section switch (section_id) { case 0x00: { // Program Association Section section_len -= 5; // Already read transport stream ID, version num, section num, and last section num section_len -= 4; // Ignore the CRC int curr_pos = 0; stream->ts_number_pat_entries = 0; while ((curr_pos < section_len) && (stream->ts_number_pat_entries < kMaxNumberPMTStreams)) { unsigned int pkt_program_num = get_bits(&bb, 16); stream->pat_info[stream->ts_number_pat_entries].program_number = pkt_program_num; get_bits(&bb, 3); // Reserved if (pkt_program_num == 0) { get_bits(&bb, 13); // pkt_network_id } else { unsigned int pkt_program_map_PID = get_bits(&bb, 13); stream->pat_info[stream->ts_number_pat_entries].program_map_PID = pkt_program_map_PID; } curr_pos += 4; stream->ts_number_pat_entries++; } } break; case 0xC7: { break; } case 0xC8: { break; } } pos += 3 + section_len; } tablepos = 0; } return 1; } static void hb_ts_stream_find_pids(hb_stream_t *stream) { // To be different from every other broadcaster in the world, New Zealand TV // changes PMTs (and thus video & audio PIDs) when 'programs' change. Since // we may have the tail of the previous program at the beginning of this // file, take our PMT from the middle of the file. fseeko(stream->file_handle, 0, SEEK_END); uint64_t fsize = ftello(stream->file_handle); fseeko(stream->file_handle, fsize >> 1, SEEK_SET); align_to_next_packet(stream); // Read the Transport Stream Packets (188 bytes each) looking at first for PID 0 (the PAT PID), then decode that // to find the program map PID and then decode that to get the list of audio and video PIDs for (;;) { const uint8_t *buf = next_packet( stream ); if ( buf == NULL ) { hb_log("hb_ts_stream_find_pids - end of file"); break; } // Get pid int pid = (((buf[1] & 0x1F) << 8) | buf[2]) & 0x1FFF; if ((pid == 0x0000) && (stream->ts_number_pat_entries == 0)) { decode_PAT(buf, stream); continue; } int pat_index = 0; for (pat_index = 0; pat_index < stream->ts_number_pat_entries; pat_index++) { // There are some streams where the PAT table has multiple entries as if their are // multiple programs in the same transport stream, and yet there's actually only one // program really in the stream. This seems to be true for transport streams that // originate in the HDHomeRun but have been output by EyeTV's export utility. What I think // is happening is that the HDHomeRun is sending the entire transport stream as broadcast, // but the EyeTV is only recording a single (selected) program number and not rewriting the // PAT info on export to match what's actually on the stream. // Until we have a way of handling multiple programs per transport stream elegantly we'll match // on the first pat entry for which we find a matching program map PID. The ideal solution would // be to build a title choice popup from the PAT program number details and then select from // their - but right now the API's not capable of that. if (stream->pat_info[pat_index].program_number != 0 && pid == stream->pat_info[pat_index].program_map_PID) { if (build_program_map(buf, stream) > 0) break; } } // Keep going until we have a complete set of PIDs if (stream->ts_number_video_pids > 0) break; } hb_log("hb_ts_stream_find_pids - found the following PIDS"); hb_log(" Video PIDS : "); int i; for (i=0; i < stream->ts_number_video_pids; i++) { hb_log( " 0x%x type %s (0x%x)", stream->ts_video_pids[i], stream_type_name(stream->ts_stream_type[i]), stream->ts_stream_type[i]); } hb_log(" Audio PIDS : "); for (i = 0; i < stream->ts_number_audio_pids; i++) { hb_log( " 0x%x type %s (0x%x)", stream->ts_audio_pids[i], stream_type_name(stream->ts_stream_type[i+1]), stream->ts_stream_type[i+1] ); } } static void fwrite64( hb_stream_t *stream, void *buf, int len ) { if ( len > 0 ) { int pos = stream->fwrite_buf->size; if ( pos + len > stream->fwrite_buf->alloc ) { int size = MAX(stream->fwrite_buf->alloc * 2, pos + len); hb_buffer_realloc(stream->fwrite_buf, size); } memcpy( &(stream->fwrite_buf->data[pos]), buf, len ); stream->fwrite_buf->size += len; } } // convert a PES PTS or DTS to an int64 static int64_t pes_timestamp( const uint8_t *pes ) { int64_t ts = ( (uint64_t)(pes[0] & 0xe ) << 29 ); ts |= ( pes[1] << 22 ) | ( ( pes[2] >> 1 ) << 15 ) | ( pes[3] << 7 ) | ( pes[4] >> 1 ); return ts; } static void generate_output_data(hb_stream_t *stream, int curstream) { hb_buffer_t *buf = stream->fwrite_buf; uint8_t *tdat = stream->ts_buf[curstream]->data; buf->id = curstream; // check if this packet was referenced to an older pcr and if that // pcr was significantly different than the one we're using now. // (the reason for the uint cast on the pcr difference is that the // difference is significant if it advanced by more than 200ms or if // it went backwards by any amount. The negative numbers look like huge // unsigned ints so the cast allows both conditions to be checked at once. int bufpcr = stream->ts_buf[curstream]->cur; int curpcr = stream->ts_pcr_out; if ( bufpcr && bufpcr < curpcr && (uint64_t)(stream->ts_pcrhist[curpcr & 3] - stream->ts_pcrhist[bufpcr & 3]) > 200*90LL ) { // we've sent up a new pcr but have a packet referenced to an // old pcr and the difference was enough to trigger a discontinuity // correction. smash the timestamps or we'll mess up the correction. buf->start = -1; buf->renderOffset = -1; } else { if ( stream->ts_pcr_out != stream->ts_pcr_in ) { // we have a new pcr stream->ts_pcr_out = stream->ts_pcr_in; buf->stop = stream->ts_pcr; stream->ts_pcrhist[stream->ts_pcr_out & 3] = stream->ts_pcr; } else { buf->stop = -1; } // put the PTS & possible DTS into 'start' & 'renderOffset' then strip // off the PES header. if ( tdat[7] & 0xc0 ) { buf->start = pes_timestamp( tdat + 9 ); buf->renderOffset = ( tdat[7] & 0x40 )? pes_timestamp( tdat + 14 ) : buf->start; } else { buf->start = -1; buf->renderOffset = -1; } } int hlen = tdat[8] + 9; fwrite64( stream, tdat + hlen, stream->ts_pos[curstream] - hlen ); stream->ts_pos[curstream] = 0; stream->ts_buf[curstream]->size = 0; } static void hb_ts_stream_append_pkt(hb_stream_t *stream, int idx, const uint8_t *buf, int len) { if (stream->ts_pos[idx] + len > stream->ts_buf[idx]->alloc) { int size; size = MAX(stream->ts_buf[idx]->alloc * 2, stream->ts_pos[idx] + len); hb_buffer_realloc(stream->ts_buf[idx], size); } memcpy(stream->ts_buf[idx]->data + stream->ts_pos[idx], buf, len); stream->ts_pos[idx] += len; stream->ts_buf[idx]->size += len; } /*********************************************************************** * hb_ts_stream_decode *********************************************************************** * **********************************************************************/ static int hb_ts_stream_decode( hb_stream_t *stream, hb_buffer_t *obuf ) { /* * stash the output buffer pointer in our stream so we don't have to * pass it & its original value to everything we call. */ obuf->size = 0; stream->fwrite_buf = obuf; // spin until we get a packet of data from some stream or hit eof while ( 1 ) { int curstream; const uint8_t *buf = next_packet(stream); if ( buf == NULL ) { // end of file - we didn't finish filling our ps write buffer // so just discard the remainder (the partial buffer is useless) hb_log("hb_ts_stream_decode - eof"); return 0; } /* This next section validates the packet */ // Get pid and use it to find stream state. int pid = ((buf[1] & 0x1F) << 8) | buf[2]; if ( ( curstream = index_of_pid( pid, stream ) ) < 0 ) continue; // Get error int errorbit = (buf[1] & 0x80) != 0; if (errorbit) { ts_err( stream, curstream, "packet error bit set"); continue; } // Get adaption header info int adaption = (buf[3] & 0x30) >> 4; int adapt_len = 0; if (adaption == 0) { ts_err( stream, curstream, "adaptation code 0"); continue; } else if (adaption == 0x2) adapt_len = 184; else if (adaption == 0x3) { adapt_len = buf[4] + 1; if (adapt_len > 184) { ts_err( stream, curstream, "invalid adapt len %d", adapt_len); continue; } } if ( adapt_len > 0 ) { if ( buf[5] & 0x40 ) { // found a random access point } // if there's an adaptation header & PCR_flag is set // get the PCR (Program Clock Reference) if ( adapt_len > 7 && ( buf[5] & 0x10 ) != 0 ) { stream->ts_pcr = ( (uint64_t)buf[6] << (33 - 8) ) | ( (uint64_t)buf[7] << (33 - 16) ) | ( (uint64_t)buf[8] << (33 - 24) ) | ( (uint64_t)buf[9] << (33 - 32) ) | ( buf[10] >> 7 ); ++stream->ts_pcr_in; stream->ts_found_pcr = 1; } } // If we don't have a PCR yet but the stream has PCRs just loop // so we don't process anything until we have a clock reference. // Unfortunately the HD Home Run appears to null out the PCR so if // we didn't detect a PCR during scan keep going and we'll use // the video stream DTS for the PCR. if ( !stream->ts_found_pcr && ( stream->ts_flags & TS_HAS_PCR ) ) { continue; } // Get continuity // Continuity only increments for adaption values of 0x3 or 0x01 // and is not checked for start packets. int start = (buf[1] & 0x40) != 0; if ( (adaption & 0x01) != 0 ) { int continuity = (buf[3] & 0xF); if ( continuity == stream->ts_streamcont[curstream] ) { // Spliced transport streams can have duplicate // continuity counts at the splice boundary. // Test to see if the packet is really a duplicate // by comparing packet summaries to see if they // match. uint8_t summary[8]; summary[0] = adaption; summary[1] = adapt_len; if (adapt_len + 4 + 6 + 9 <= 188) { memcpy(&summary[2], buf+4+adapt_len+9, 6); } else { memset(&summary[2], 0, 6); } if ( memcmp( summary, stream->ts_pkt_summary[curstream], 8 ) == 0 ) { // we got a duplicate packet (usually used to introduce // a PCR when one is needed). The only thing that can // change in the dup is the PCR which we grabbed above // so ignore the rest. continue; } } if ( !start && (stream->ts_streamcont[curstream] != -1) && !stream->ts_skipbad[curstream] && (continuity != ( (stream->ts_streamcont[curstream] + 1) & 0xf ) ) ) { ts_err( stream, curstream, "continuity error: got %d expected %d", (int)continuity, (stream->ts_streamcont[curstream] + 1) & 0xf ); stream->ts_streamcont[curstream] = continuity; continue; } stream->ts_streamcont[curstream] = continuity; // Save a summary of this packet for later duplicate // testing. The summary includes some header information // and payload bytes. Should be enough to detect // non-duplicates. stream->ts_pkt_summary[curstream][0] = adaption; stream->ts_pkt_summary[curstream][1] = adapt_len; if (adapt_len + 4 + 6 + 9 <= 188) { memcpy(&stream->ts_pkt_summary[curstream][2], buf+4+adapt_len+9, 6); } else { memset(&stream->ts_pkt_summary[curstream][2], 0, 6); } } /* If we get here the packet is valid - process its data */ if ( start ) { // Found a random access point (now we can start a frame/audio packet..) if ( stream->need_keyframe ) { // we're looking for the first video frame because we're // doing random access during 'scan' if ( curstream != 0 || !isIframe( stream, buf, adapt_len ) ) { // not the video stream or didn't find an I frame // but we'll only wait 255 video frames for an I frame. if ( curstream != 0 || ++stream->need_keyframe ) { continue; } } stream->need_keyframe = 0; } // If we were skipping a bad packet, start fresh on this new PES packet.. if (stream->ts_skipbad[curstream] == 1) { stream->ts_skipbad[curstream] = 0; } if ( curstream == 0 ) { ++stream->frames; // if we don't have a pcr yet use the dts from this frame if ( !stream->ts_found_pcr ) { // PES must begin with an mpeg start code & contain // a DTS or PTS. const uint8_t *pes = buf + adapt_len + 4; if ( pes[0] != 0x00 || pes[1] != 0x00 || pes[2] != 0x01 || ( pes[7] >> 6 ) == 0 ) { continue; } // if we have a dts use it otherwise use the pts stream->ts_pcr = pes_timestamp( pes + ( pes[7] & 0x40? 14 : 9 ) ); ++stream->ts_pcr_in; } } // if this is a multiplexed stream make sure this is the // substream we want. if ( stream->ts_multiplexed[curstream] ) { // PES must begin with an mpeg start code & contain // a DTS or PTS. const uint8_t *pes = buf + adapt_len + 4; if ( pes[0] != 0x00 || pes[1] != 0x00 || pes[2] != 0x01 || pes[3] != 0xfd ) { stream->ts_skipbad[curstream] = 1; continue; } // the last byte of the header is the extension id. see if // it's the one we want. if ( pes[pes[8]+8] != stream->ts_multiplexed[curstream] ) { stream->ts_skipbad[curstream] = 1; continue; } } // If we have some data already on this stream, turn it into // a program stream packet. Then add the payload for this // packet to the current pid's buffer. if ( stream->ts_pos[curstream] ) { // we have to ship the old packet before updating the pcr // since the packet we've been accumulating is referenced // to the old pcr. generate_output_data(stream, curstream); // remember the pcr that was in effect when we started // this packet. stream->ts_buf[curstream]->cur = stream->ts_pcr_in; hb_ts_stream_append_pkt(stream, curstream, buf + 4 + adapt_len, 184 - adapt_len); return 1; } // remember the pcr that was in effect when we started this packet. stream->ts_buf[curstream]->cur = stream->ts_pcr_in; } // Add the payload for this packet to the current buffer if (!stream->ts_skipbad[curstream] && (184 - adapt_len) > 0) { hb_ts_stream_append_pkt(stream, curstream, buf + 4 + adapt_len, 184 - adapt_len); // see if we've hit the end of this PES packet const uint8_t *pes = stream->ts_buf[curstream]->data; int len = ( pes[4] << 8 ) + pes[5] + 6; if ( len > 6 && stream->ts_pos[curstream] == len && pes[0] == 0x00 && pes[1] == 0x00 && pes[2] == 0x01 ) { generate_output_data(stream, curstream); return 1; } } } } static void hb_ts_stream_reset(hb_stream_t *stream) { int i; for (i=0; i < kMaxNumberDecodeStreams; i++) { stream->ts_pos[i] = 0; stream->ts_skipbad[i] = 1; stream->ts_streamcont[i] = -1; } stream->need_keyframe = 0; stream->ts_found_pcr = 0; stream->ts_pcr_out = 0; stream->ts_pcr_in = 0; stream->ts_pcr = 0; stream->frames = 0; stream->errors = 0; stream->last_error_frame = -10000; stream->last_error_count = 0; align_to_next_packet(stream); } // ------------------------------------------------------------------ // Support for reading media files via the ffmpeg libraries. static void ffmpeg_add_codec( hb_stream_t *stream, int stream_index ) { // add a codec to the context here so it will be there when we // read the first packet. AVCodecContext *context = stream->ffmpeg_ic->streams[stream_index]->codec; context->workaround_bugs = FF_BUG_AUTODETECT; context->error_recognition = 1; context->error_concealment = FF_EC_GUESS_MVS|FF_EC_DEBLOCK; AVCodec *codec = avcodec_find_decoder( context->codec_id ); hb_avcodec_open( context, codec ); } // The ffmpeg stream reader / parser shares a lot of state with the // decoder via a codec context kept in the AVStream of the reader's // AVFormatContext. Since decoding is done in a different thread we // have to somehow pass this codec context to the decoder and we have // to do it before the first packet is read (so we can't put the info // in the buf we'll send downstream). Decoders don't have any way to // get to the stream directly (they're not passed the title or job // pointers during a scan) so this is a back door for the decoder to // get the codec context. We just stick the stream pointer in the next // slot an array of pointers maintained as a circular list then return // the index into the list combined with the ffmpeg stream index as the // codec_param that will be passed to the decoder init routine. We make // the list 'big' (enough for 1024 simultaneously open ffmpeg streams) // so that we don't have to do a complicated allocator or worry about // deleting entries on close. // // Entries can only be added to this list during a scan and are never // deleted so the list access doesn't require locking. static hb_stream_t **ffmpeg_streams; // circular list of stream pointers static int ffmpeg_stream_cur; // where we put the last stream pointer #define ffmpeg_sl_bits (10) // log2 stream list size (in entries) #define ffmpeg_sl_size (1 << ffmpeg_sl_bits) // add a stream to the list & return the appropriate codec_param to access it static int ffmpeg_codec_param( hb_stream_t *stream, int stream_index ) { if ( !ffmpeg_streams ) { ffmpeg_streams = calloc( ffmpeg_sl_size, sizeof(stream) ); } // the title scan adds all the ffmpeg media streams at once so we // only add a new entry to our stream list if the stream is different // than last time. int slot = ffmpeg_stream_cur; if ( ffmpeg_streams[slot] != stream ) { // new stream - put it in the next slot of the stream list slot = ++ffmpeg_stream_cur & (ffmpeg_sl_size - 1); ffmpeg_streams[slot] = stream; } ffmpeg_add_codec( stream, stream_index ); return ( stream_index << ffmpeg_sl_bits ) | slot; } // we're about to open 'title' to convert it - remap the stream associated // with the video & audio codec params of the title to refer to 'stream' // (the original scan stream was closed and no longer exists). static void ffmpeg_remap_stream( hb_stream_t *stream, hb_title_t *title ) { // all the video & audio came from the same stream so remapping // the video's stream slot takes care of everything. int slot = title->video_codec_param & (ffmpeg_sl_size - 1); ffmpeg_streams[slot] = stream; // add codecs for all the streams used by the title ffmpeg_add_codec( stream, title->video_codec_param >> ffmpeg_sl_bits ); int i; hb_audio_t *audio; for ( i = 0; ( audio = hb_list_item( title->list_audio, i ) ); ++i ) { if ( audio->config.in.codec == HB_ACODEC_FFMPEG ) { ffmpeg_add_codec( stream, audio->config.in.codec_param >> ffmpeg_sl_bits ); } } } void *hb_ffmpeg_context( int codec_param ) { int slot = codec_param & (ffmpeg_sl_size - 1); int stream_index = codec_param >> ffmpeg_sl_bits; return ffmpeg_streams[slot]->ffmpeg_ic->streams[stream_index]->codec; } void *hb_ffmpeg_avstream( int codec_param ) { int slot = codec_param & (ffmpeg_sl_size - 1); int stream_index = codec_param >> ffmpeg_sl_bits; return ffmpeg_streams[slot]->ffmpeg_ic->streams[stream_index]; } static AVFormatContext *ffmpeg_deferred_close; static int ffmpeg_open( hb_stream_t *stream, hb_title_t *title ) { if ( ffmpeg_deferred_close ) { av_close_input_file( ffmpeg_deferred_close ); ffmpeg_deferred_close = NULL; } AVFormatContext *ic; av_log_set_level( AV_LOG_ERROR ); if ( av_open_input_file( &ic, stream->path, NULL, 0, NULL ) < 0 ) { return 0; } if ( av_find_stream_info( ic ) < 0 ) goto fail; stream->ffmpeg_ic = ic; stream->hb_stream_type = ffmpeg; stream->ffmpeg_pkt = malloc(sizeof(*stream->ffmpeg_pkt)); av_init_packet( stream->ffmpeg_pkt ); stream->chapter_end = INT64_MAX; if ( title ) { // we're opening for read. scan passed out codec params that // indexed its stream so we need to remap them so they point // to this stream. ffmpeg_remap_stream( stream, title ); av_log_set_level( AV_LOG_ERROR ); } else { // we're opening for scan. let ffmpeg put some info into the // log about what we've got. av_log_set_level( AV_LOG_INFO ); dump_format( ic, 0, stream->path, 0 ); av_log_set_level( AV_LOG_ERROR ); // accept this file if it has at least one video stream we can decode int i; for (i = 0; i < ic->nb_streams; ++i ) { if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO ) { break; } } if ( i >= ic->nb_streams ) goto fail; } return 1; fail: av_close_input_file( ic ); return 0; } static void ffmpeg_close( hb_stream_t *d ) { // XXX since we're sharing the CodecContext with the downstream // decoder proc we can't close the stream. We need to reference count // this so we can close it when both are done with their instance but // for now just defer the close until the next stream open or close. if ( ffmpeg_deferred_close ) { av_close_input_file( ffmpeg_deferred_close ); } ffmpeg_deferred_close = d->ffmpeg_ic; if ( d->ffmpeg_pkt != NULL ) { free( d->ffmpeg_pkt ); d->ffmpeg_pkt = NULL; } } static void add_ffmpeg_audio( hb_title_t *title, hb_stream_t *stream, int id ) { AVStream *st = stream->ffmpeg_ic->streams[id]; AVCodecContext *codec = st->codec; // scan will ignore any audio without a bitrate. Since we've already // typed the audio in order to determine its codec we set up the audio // paramters here. if ( codec->bit_rate || codec->sample_rate ) { static const int chan2layout[] = { HB_INPUT_CH_LAYOUT_MONO, // We should allow no audio really. HB_INPUT_CH_LAYOUT_MONO, HB_INPUT_CH_LAYOUT_STEREO, HB_INPUT_CH_LAYOUT_2F1R, HB_INPUT_CH_LAYOUT_2F2R, HB_INPUT_CH_LAYOUT_3F2R, HB_INPUT_CH_LAYOUT_4F2R, HB_INPUT_CH_LAYOUT_STEREO, HB_INPUT_CH_LAYOUT_STEREO, }; hb_audio_t *audio = calloc( 1, sizeof(*audio) );; audio->id = id; if ( codec->codec_id == CODEC_ID_AC3 ) { audio->config.in.codec = HB_ACODEC_AC3; } else if ( codec->codec_id == CODEC_ID_DTS ) { audio->config.in.codec = HB_ACODEC_DCA; } else { audio->config.in.codec = HB_ACODEC_FFMPEG; audio->config.in.codec_param = ffmpeg_codec_param( stream, id ); audio->config.in.bitrate = codec->bit_rate? codec->bit_rate : 1; audio->config.in.samplerate = codec->sample_rate; audio->config.in.channel_layout = chan2layout[codec->channels & 7]; } set_audio_description( audio, lang_for_code2( st->language ) ); hb_list_add( title->list_audio, audio ); } } static hb_title_t *ffmpeg_title_scan( hb_stream_t *stream ) { AVFormatContext *ic = stream->ffmpeg_ic; // 'Barebones Title' hb_title_t *title = hb_title_init( stream->path, 0 ); title->type = HB_STREAM_TYPE; title->index = 1; // Copy part of the stream path to the title name char *sep = strrchr(stream->path, '/'); if (sep) strcpy(title->name, sep+1); char *dot_term = strrchr(title->name, '.'); if (dot_term) *dot_term = '\0'; uint64_t dur = ic->duration * 90000 / AV_TIME_BASE; title->duration = dur; dur /= 90000; title->hours = dur / 3600; title->minutes = ( dur % 3600 ) / 60; title->seconds = dur % 60; // set the title to decode the first video stream in the file title->demuxer = HB_NULL_DEMUXER; title->video_codec = 0; int i; for (i = 0; i < ic->nb_streams; ++i ) { if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO && avcodec_find_decoder( ic->streams[i]->codec->codec_id ) && title->video_codec == 0 ) { title->video_id = i; stream->ffmpeg_video_id = i; // We have to use the 'internal' avcodec decoder because // it needs to share the codec context from this video // stream. The parser internal to av_read_frame // passes a bunch of state info to the decoder via the context. title->video_codec = WORK_DECAVCODECVI; title->video_codec_param = ffmpeg_codec_param( stream, i ); } else if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO && avcodec_find_decoder( ic->streams[i]->codec->codec_id ) ) { add_ffmpeg_audio( title, stream, i ); } } title->container_name = strdup( ic->iformat->name ); title->data_rate = ic->bit_rate; hb_deep_log( 2, "Found ffmpeg %d chapters, container=%s", ic->nb_chapters, ic->iformat->name ); if( ic->nb_chapters != 0 ) { AVChapter *m; uint64_t duration_sum = 0; for( i = 0; i < ic->nb_chapters; i++ ) if( ( m = ic->chapters[i] ) != NULL ) { hb_chapter_t * chapter; chapter = calloc( sizeof( hb_chapter_t ), 1 ); chapter->index = i+1; chapter->duration = ( m->end / ( (double) m->time_base.num * m->time_base.den ) ) * 90000 - duration_sum; duration_sum += chapter->duration; chapter->hours = chapter->duration / 90000 / 3600; chapter->minutes = ( ( chapter->duration / 90000 ) % 3600 ) / 60; chapter->seconds = ( chapter->duration / 90000 ) % 60; strcpy( chapter->title, m->title ); hb_deep_log( 2, "Added chapter %i, name='%s', dur=%"PRIu64", (%02i:%02i:%02i)", chapter->index, chapter->title, chapter->duration, chapter->hours, chapter->minutes, chapter->seconds ); hb_list_add( title->list_chapter, chapter ); } } /* * Fill the metadata. */ decmetadata( title ); if( hb_list_count( title->list_chapter ) == 0 ) { // Need at least one chapter hb_chapter_t * chapter; chapter = calloc( sizeof( hb_chapter_t ), 1 ); chapter->index = 1; chapter->duration = title->duration; chapter->hours = title->hours; chapter->minutes = title->minutes; chapter->seconds = title->seconds; hb_list_add( title->list_chapter, chapter ); } return title; } static int64_t av_to_hb_pts( int64_t pts, double conv_factor ) { if ( pts == AV_NOPTS_VALUE ) return -1; return (int64_t)( (double)pts * conv_factor ); } static int ffmpeg_is_keyframe( hb_stream_t *stream ) { uint8_t *pkt; switch ( stream->ffmpeg_ic->streams[stream->ffmpeg_video_id]->codec->codec_id ) { case CODEC_ID_VC1: // XXX the VC1 codec doesn't mark key frames so to get previews // we do it ourselves here. The decoder gets messed up if it // doesn't get a SEQ header first so we consider that to be a key frame. pkt = stream->ffmpeg_pkt->data; if ( !pkt[0] && !pkt[1] && pkt[2] == 1 && pkt[3] == 0x0f ) return 1; return 0; case CODEC_ID_WMV3: // XXX the ffmpeg WMV3 codec doesn't mark key frames. // Only M$ could make I-frame detection this complicated: there // are two to four bits of unused junk ahead of the frame type // so we have to look at the sequence header to find out how much // to skip. Then there are three different ways of coding the type // depending on whether it's main or advanced profile then whether // there are bframes or not so we have to look at the sequence // header to get that. pkt = stream->ffmpeg_pkt->data; uint8_t *seqhdr = stream->ffmpeg_ic->streams[stream->ffmpeg_video_id]->codec->extradata; int pshift = 2; if ( ( seqhdr[3] & 0x02 ) == 0 ) // no FINTERPFLAG ++pshift; if ( ( seqhdr[3] & 0x80 ) == 0 ) // no RANGEREDUCTION ++pshift; if ( seqhdr[3] & 0x70 ) // stream has b-frames return ( ( pkt[0] >> pshift ) & 0x3 ) == 0x01; return ( ( pkt[0] >> pshift ) & 0x2 ) == 0; default: break; } return ( stream->ffmpeg_pkt->flags & PKT_FLAG_KEY ); } static int ffmpeg_read( hb_stream_t *stream, hb_buffer_t *buf ) { int err; again: if ( ( err = av_read_frame( stream->ffmpeg_ic, stream->ffmpeg_pkt )) < 0 ) { // XXX the following conditional is to handle avi files that // use M$ 'packed b-frames' and occasionally have negative // sizes for the null frames these require. if ( err != AVERROR_NOMEM || stream->ffmpeg_pkt->size >= 0 ) // eof return 0; } if ( stream->ffmpeg_pkt->size <= 0 ) { // M$ "invalid and inefficient" packed b-frames require 'null frames' // following them to preserve the timing (since the packing puts two // or more frames in what looks like one avi frame). The contents and // size of these null frames are ignored by the ff_h263_decode_frame // as long as they're < 20 bytes. We need a positive size so we use // one byte if we're given a zero or negative size. We don't know // if the pkt data points anywhere reasonable so we just stick a // byte of zero in our outbound buf. buf->size = 1; *buf->data = 0; } else { if ( stream->ffmpeg_pkt->size > buf->alloc ) { // sometimes we get absurd sizes from ffmpeg if ( stream->ffmpeg_pkt->size >= (1 << 25) ) { hb_log( "ffmpeg_read: pkt too big: %d bytes", stream->ffmpeg_pkt->size ); av_free_packet( stream->ffmpeg_pkt ); return ffmpeg_read( stream, buf ); } // need to expand buffer hb_buffer_realloc( buf, stream->ffmpeg_pkt->size ); } memcpy( buf->data, stream->ffmpeg_pkt->data, stream->ffmpeg_pkt->size ); buf->size = stream->ffmpeg_pkt->size; } buf->id = stream->ffmpeg_pkt->stream_index; if ( buf->id == stream->ffmpeg_video_id ) { if ( stream->need_keyframe ) { // we've just done a seek (generally for scan or live preview) and // want to start at a keyframe. Some ffmpeg codecs seek to a key // frame but most don't. So we spin until we either get a keyframe // or we've looked through 50 video frames without finding one. if ( ! ffmpeg_is_keyframe( stream ) && ++stream->need_keyframe < 50 ) { av_free_packet( stream->ffmpeg_pkt ); goto again; } stream->need_keyframe = 0; } ++stream->frames; } // if we haven't done it already, compute a conversion factor to go // from the ffmpeg timebase for the stream to HB's 90KHz timebase. double tsconv = stream->ffmpeg_tsconv[stream->ffmpeg_pkt->stream_index]; if ( ! tsconv ) { AVStream *s = stream->ffmpeg_ic->streams[stream->ffmpeg_pkt->stream_index]; tsconv = 90000. * (double)s->time_base.num / (double)s->time_base.den; stream->ffmpeg_tsconv[stream->ffmpeg_pkt->stream_index] = tsconv; } buf->start = av_to_hb_pts( stream->ffmpeg_pkt->pts, tsconv ); buf->renderOffset = av_to_hb_pts( stream->ffmpeg_pkt->dts, tsconv ); if ( buf->renderOffset >= 0 && buf->start == -1 ) { buf->start = buf->renderOffset; } /* * Check to see whether this video buffer is on a chapter * boundary, if so mark it as such in the buffer then advance * chapter_end to the end of the next chapter. * If there are no chapters, chapter_end is always initialized to INT64_MAX * (roughly 3 million years at our 90KHz clock rate) so the test * below handles both the chapters & no chapters case. */ if ( buf->id == stream->ffmpeg_video_id && buf->start >= stream->chapter_end ) { hb_chapter_t *chapter = hb_list_item( stream->title->list_chapter, stream->chapter+1 ); if( chapter ) { stream->chapter++; stream->chapter_end += chapter->duration; buf->new_chap = stream->chapter + 1; hb_deep_log( 2, "ffmpeg_read starting chapter %i at %"PRId64, buf->new_chap, buf->start); } else { // Must have run out of chapters, stop looking. stream->chapter_end = INT64_MAX; } } else { buf->new_chap = 0; } av_free_packet( stream->ffmpeg_pkt ); return 1; } static int ffmpeg_seek( hb_stream_t *stream, float frac ) { AVFormatContext *ic = stream->ffmpeg_ic; if ( frac > 0. ) { int64_t pos = (double)ic->duration * (double)frac; if ( ic->start_time != AV_NOPTS_VALUE && ic->start_time > 0 ) { pos += ic->start_time; } av_seek_frame( ic, -1, pos, 0 ); stream->need_keyframe = 1; } else { av_seek_frame( ic, -1, 0LL, AVSEEK_FLAG_BACKWARD ); } return 1; }