/* $Id$
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 15
#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];
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 *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, "r" );
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->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 @ %lld", pos );
return NULL;
}
ts_warn( stream, "next_packet: sync lost @ %lld, regained after %lld 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 %llu", fpos);
return pp;
}
if ( ( buf[7] >> 7 ) != 1 )
{
hb_log("hb_sample_pts: no PTS in video packet near %llu", 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;
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 %lld, ends %lld, AV pos %lld",
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] = (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;
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 )
{
// already have this pid - do nothing
}
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)
{
// align to first packet
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) && (stream->ts_number_audio_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] )
{
// 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;
}
/* 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 )
{
// tell ffmpeg we want a pts on every frame it returns
stream->ffmpeg_ic->flags |= AVFMT_FLAG_GENPTS;
// 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->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=%llu, (%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 );
if( chapter )
{
stream->chapter_end += chapter->duration;
buf->new_chap = stream->chapter + 1;
hb_deep_log( 2, "ffmpeg_read starting chapter %i at %lld",
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;
}