/* $Id$
This file is part of the HandBrake source code.
Homepage: .
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "lang.h"
#include "a52dec/a52.h"
#include
#define min(a, b) a < b ? a : b
typedef enum { hb_stream_type_unknown = 0, hb_stream_type_transport, hb_stream_type_program } hb_stream_type_t;
#define kMaxNumberDecodeStreams 8
#define kMaxNumberVideoPIDS 16
#define kMaxNumberAudioPIDS 16
//#define kVideoStream 0
//#define kAudioStream 1
#define kNumDecodeBuffers 2
#define kMaxNumberPMTStreams 32
#define CLOCKRATE ((int64_t)27000000) // MPEG System clock rate
#define STREAMRATE ((int64_t)2401587) // Original HD stream rate 19.2 Mbps
#define DEMUX (((int)STREAMRATE * 8) / 50)// Demux value for HD content STREAMRATE / 50
struct hb_stream_s
{
char * path;
FILE * file_handle;
hb_stream_type_t stream_type;
int ps_current_write_buffer_index;
int ps_current_read_buffer_index;
struct {
int size;
int len;
int read_pos;
int write_pos;
unsigned char * data;
} ps_decode_buffer[kNumDecodeBuffers];
struct {
int lang_code;
int flags;
int rate;
int bitrate;
} a52_info[kMaxNumberAudioPIDS];
int ts_video_pids[kMaxNumberVideoPIDS];
int ts_audio_pids[kMaxNumberAudioPIDS];
int ts_number_video_pids;
int ts_number_audio_pids;
unsigned char* ts_packetbuf[kMaxNumberDecodeStreams];
int ts_packetpos[kMaxNumberDecodeStreams];
// int ts_bufpackets[kMaxNumberDecodeStreams];
int ts_foundfirst[kMaxNumberDecodeStreams];
int ts_skipbad[kMaxNumberDecodeStreams];
int ts_streamcont[kMaxNumberDecodeStreams];
int ts_streamid[kMaxNumberDecodeStreams];
int ts_audio_stream_type[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 void hb_ts_stream_decode(hb_stream_t *stream);
static void hb_ts_stream_reset(hb_stream_t *stream);
static void hb_stream_put_back(hb_stream_t *stream, int i);
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(FILE* f);
static inline 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 inline 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 inline int have_ts_sync(const uint8_t *buf)
{
return check_ts_sync(&buf[0*188]) && check_ts_sync(&buf[1*188]) &&
check_ts_sync(&buf[2*188]) && check_ts_sync(&buf[3*188]) &&
check_ts_sync(&buf[4*188]) && check_ts_sync(&buf[5*188]) &&
check_ts_sync(&buf[6*188]) && check_ts_sync(&buf[7*188]);
}
static int hb_stream_check_for_ts(const uint8_t *buf)
{
// transport streams should have a sync byte every 188 bytes.
// search the first KB of buf looking for at least 8 consecutive
// correctly located sync patterns.
int offset = 0;
for ( offset = 0; offset < 1024; ++offset )
{
if ( have_ts_sync( &buf[offset]) )
return 1;
}
return 0;
}
static int hb_stream_check_for_ps(const uint8_t *buf)
{
// program streams should have a Pack header every 2048 bytes.
// check that we have 4 of these.
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) )
{
if ( hb_stream_check_for_ts(buf) != 0 )
{
hb_log("file is MPEG Transport Stream");
stream->stream_type = hb_stream_type_transport;
hb_ts_stream_init(stream);
return 1;
}
if ( hb_stream_check_for_ps(buf) != 0 )
{
hb_log("file is MPEG Program Stream");
stream->stream_type = hb_stream_type_program;
return 1;
}
}
return 0;
}
/***********************************************************************
* hb_stream_open
***********************************************************************
*
**********************************************************************/
hb_stream_t * hb_stream_open( char * path )
{
hb_stream_t * d;
d = calloc( sizeof( hb_stream_t ), 1 );
/* open the file and see if it's a type we know about. return a stream
* reference structure if we can deal with it & NULL otherwise. */
if( ( d->file_handle = fopen( path, "rb" ) ) )
{
d->path = strdup( path );
if (d->path != NULL && hb_stream_get_type( d ) != 0 )
{
return d;
}
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 * d = *_d;
if( d->file_handle )
{
fclose( d->file_handle );
d->file_handle = NULL;
}
int i=0;
for (i = 0; i < kNumDecodeBuffers; i++)
{
if (d->ps_decode_buffer[i].data)
{
free(d->ps_decode_buffer[i].data);
d->ps_decode_buffer[i].data = NULL;
}
}
for (i = 0; i < kMaxNumberDecodeStreams; i++)
{
if (d->ts_packetbuf[i])
{
free(d->ts_packetbuf[i]);
d->ts_packetbuf[i] = NULL;
}
}
free( d->path );
free( d );
*_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 copying all later entries down one slot. */
static void hb_stream_delete_audio_entry(hb_stream_t *stream, int indx)
{
int i;
for (i = indx+1; i < stream->ts_number_audio_pids; ++i)
{
stream->ts_audio_pids[indx] = stream->ts_audio_pids[i];
stream->ts_audio_stream_type[indx] = stream->ts_audio_stream_type[i];
++indx;
}
--stream->ts_number_audio_pids;
}
/***********************************************************************
* hb_ps_stream_title_scan
***********************************************************************
*
**********************************************************************/
hb_title_t * hb_stream_title_scan(hb_stream_t *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->stream_type == 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->codec)
hb_list_add( aTitle->list_audio, audio );
else
{
free(audio);
hb_stream_delete_audio_entry(stream, i);
--i;
}
}
}
else
{
hb_ps_stream_find_audio_ids(stream, aTitle);
}
return aTitle;
}
/*
* 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)
{
static uint8_t buf[188];
int npack = 100000; // max packets to read
while (--npack >= 0)
{
if (fread(buf, 1, 188, stream->file_handle) != 188)
{
hb_log("hb_ts_stream_getPEStype: EOF while searching for PID 0x%x", pid);
return 0;
}
if (buf[0] != 0x47)
{
hb_log("hb_ts_stream_getPEStype: lost sync while searching for PID 0x%x", pid);
align_to_next_packet(stream->file_handle);
continue;
}
/*
* 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 || (buf[1] & 0x1f) != (pid >> 8) ||
buf[2] != (pid & 0xff))
{
// 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;
}
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);
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
***********************************************************************
*
**********************************************************************/
struct pts_pos {
uint64_t pos; /* file position of this PTS sample */
uint64_t pts; /* PTS from video stream */
};
static struct pts_pos hb_sample_pts(hb_stream_t *stream, uint64_t fpos)
{
struct pts_pos pp = { 0, 0 };
if ( stream->stream_type == hb_stream_type_program )
{
// round address down to nearest dvd sector start
fpos &=~ ( HB_DVD_READ_BUFFER_SIZE - 1 );
fseeko( stream->file_handle, fpos, SEEK_SET );
pp.pts = hb_ps_stream_getVideoPTS( stream );
}
else
{
const uint8_t *buf;
fseeko( stream->file_handle, fpos, SEEK_SET );
align_to_next_packet( stream->file_handle );
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 );
}
pp.pos = ftello(stream->file_handle);
hb_log("hb_sample_pts: pts %lld at %llu", pp.pts, pp.pos );
return pp;
}
static void hb_stream_duration(hb_stream_t *stream, hb_title_t *inTitle)
{
// To calculate the duration we get video presentation time stamps
// at a couple places in the file then use their difference scaled
// by the ratio of the distance between our measurement points &
// the size of the file. The issue is that our 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 need to difference two pts's from the same program
// fragment. Since extraneous material is very likely at the beginning
// and end of the content, for now we take a time stamp from 25%
// into the file & 75% into the file then double their difference
// to get the total duration.
struct pts_pos first_pts, last_pts;
fseeko(stream->file_handle, 0, SEEK_END);
uint64_t fsize = ftello(stream->file_handle);
first_pts = hb_sample_pts(stream, fsize >> 2);
last_pts = hb_sample_pts(stream, fsize - (fsize >> 2) );
if ( first_pts.pos && last_pts.pos && first_pts.pos != last_pts.pos )
{
uint64_t dur = ( ( last_pts.pts - first_pts.pts ) * fsize ) /
( last_pts.pos - first_pts.pos );
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->stream_type == hb_stream_type_program)
{
size_t amt_read;
amt_read = fread(b->data, HB_DVD_READ_BUFFER_SIZE, 1, src_stream->file_handle);
if (amt_read > 0)
return 1;
else
return 0;
}
else if (src_stream->stream_type == hb_stream_type_transport)
{
int read_buffer_index = src_stream->ps_current_read_buffer_index;
// Transport streams are a little more complex - we might be able to just
// read from the transport stream conversion buffer (if there's enough data)
// or we may need to transfer what's left and fill it again.
if (src_stream->ps_decode_buffer[read_buffer_index].len - src_stream->ps_decode_buffer[read_buffer_index].read_pos > HB_DVD_READ_BUFFER_SIZE)
{
memcpy(b->data, src_stream->ps_decode_buffer[read_buffer_index].data + src_stream->ps_decode_buffer[read_buffer_index].read_pos,HB_DVD_READ_BUFFER_SIZE);
src_stream->ps_decode_buffer[read_buffer_index].read_pos += HB_DVD_READ_BUFFER_SIZE;
return 1;
}
else
{
// Not quite enough data in the buffer - transfer what is present, fill the buffer and then
// transfer what's still needed.
int transfer_size = HB_DVD_READ_BUFFER_SIZE;
int amt_avail_to_transfer = src_stream->ps_decode_buffer[read_buffer_index].len - src_stream->ps_decode_buffer[read_buffer_index].read_pos;
memcpy(b->data, src_stream->ps_decode_buffer[read_buffer_index].data + src_stream->ps_decode_buffer[read_buffer_index].read_pos, amt_avail_to_transfer);
transfer_size -= amt_avail_to_transfer;
src_stream->ps_decode_buffer[read_buffer_index].read_pos += amt_avail_to_transfer;
// Give up this buffer - decoding may well need it, and we're done
src_stream->ps_decode_buffer[read_buffer_index].write_pos = 0;
src_stream->ps_decode_buffer[read_buffer_index].len = 0;
// Fill the buffer
hb_ts_stream_decode(src_stream);
// Decoding will almost certainly have changed the current read buffer index
read_buffer_index = src_stream->ps_current_read_buffer_index;
if (src_stream->ps_decode_buffer[read_buffer_index].len == 0)
{
hb_log("hb_stream_read - buffer after decode has zero length data");
return 0;
}
// Read the bit we still need
memcpy(b->data+amt_avail_to_transfer, src_stream->ps_decode_buffer[read_buffer_index].data + src_stream->ps_decode_buffer[read_buffer_index].read_pos,transfer_size);
src_stream->ps_decode_buffer[read_buffer_index].read_pos += transfer_size;
return 1;
}
}
else
return 0;
}
/***********************************************************************
* hb_stream_seek
***********************************************************************
*
**********************************************************************/
int hb_stream_seek( hb_stream_t * src_stream, float f )
{
off_t stream_size, cur_pos, new_pos;
double pos_ratio = f;
cur_pos = ftello(src_stream->file_handle);
fseeko(src_stream->file_handle,0 ,SEEK_END);
stream_size = ftello(src_stream->file_handle);
new_pos = (off_t) ((double) (stream_size) * pos_ratio);
new_pos &=~ (HB_DVD_READ_BUFFER_SIZE - 1);
int r = fseeko(src_stream->file_handle, new_pos, SEEK_SET);
if (r == -1)
{
fseeko(src_stream->file_handle, cur_pos, SEEK_SET);
return 0;
}
if (src_stream->stream_type == 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(src_stream);
}
// Now we must scan forwards for a valid start code (0x000001BA)
int done = 0;
hb_buffer_t *buf = hb_buffer_init(HB_DVD_READ_BUFFER_SIZE);
while (!done)
{
if (hb_stream_read(src_stream,buf) == 1)
{
int i=0;
for (i=0; (i <= HB_DVD_READ_BUFFER_SIZE-4) && (!done); i++)
{
if ((buf->data[i] == 0x00) && (buf->data[i+1] == 0x00) && (buf->data[i+2] == 0x01) && (buf->data[i+3] == 0xba))
{
done = 1;
// 'Put Back' the data we've just read (up to this point)
hb_stream_put_back(src_stream, i);
}
}
}
else
done = 1; // End of data;
}
hb_buffer_close(&buf);
return 1;
}
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->file_handle);
buf = hb_ts_stream_getPEStype(stream, stream->ts_audio_pids[aud_pid_index]);
/* check that we found a PES header */
if (buf && buf[0] == 0x00 && buf[1] == 0x00 && buf[2] == 0x01)
{
if (buf[3] == 0xbd)
{
audio->id = 0x80bd | (aud_pid_index << 8);
audio->codec = HB_ACODEC_AC3;
hb_log("transport stream pid 0x%x (type 0x%x) is AC-3 audio id 0x%x",
stream->ts_audio_pids[aud_pid_index],
stream->ts_audio_stream_type[aud_pid_index],
audio->id);
stream->ts_audio_stream_type[aud_pid_index] = 0x81;
}
else if ((buf[3] & 0xe0) == 0xc0)
{
audio->id = buf[3];
audio->codec = HB_ACODEC_MPGA;
hb_log("transport stream pid 0x%x (type 0x%x) is MPEG audio id 0x%x",
stream->ts_audio_pids[aud_pid_index],
stream->ts_audio_stream_type[aud_pid_index],
audio->id);
stream->ts_audio_stream_type[aud_pid_index] = 0x03;
}
}
fseeko(stream->file_handle, cur_pos, SEEK_SET);
if (! audio->codec)
{
hb_log("transport stream pid 0x%x (type 0x%x) isn't audio",
stream->ts_audio_pids[aud_pid_index],
stream->ts_audio_stream_type[aud_pid_index]);
}
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->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->codec = HB_ACODEC_AC3;
hb_log("add_audio_to_title: added AC3 audio stream 0x%x", id);
break;
case 0xa:
audio->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;
}
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);
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_stream_update_audio
***********************************************************************
*
**********************************************************************/
void hb_stream_update_audio(hb_stream_t *stream, hb_audio_t *audio)
{
iso639_lang_t *lang;
if (stream->stream_type == hb_stream_type_transport)
{
// Find the audio stream info for this PID
int i = (audio->id >> 8) & 0xf;
if (i >= stream->ts_number_audio_pids)
{
hb_log("hb_stream_update_audio: no PID for audio stream 0x%x",
audio->id);
return;
}
lang = lang_for_code(stream->a52_info[i].lang_code);
if (!audio->rate)
audio->rate = stream->a52_info[i].rate;
if (!audio->bitrate)
audio->bitrate = stream->a52_info[i].bitrate;
if (!audio->config.a52.ac3flags)
audio->config.a52.ac3flags = audio->ac3flags = stream->a52_info[i].flags;
}
else
{
// XXX should try to get language code from the AC3 bitstream
lang = lang_for_code(0x0000);
}
if (!audio->input_channel_layout)
{
switch( audio->ac3flags & A52_CHANNEL_MASK )
{
/* mono sources */
case A52_MONO:
case A52_CHANNEL1:
case A52_CHANNEL2:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_MONO;
break;
/* stereo input */
case A52_CHANNEL:
case A52_STEREO:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
break;
/* dolby (DPL1 aka Dolby Surround = 4.0 matrix-encoded) input */
case A52_DOLBY:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_DOLBY;
break;
/* 3F/2R input */
case A52_3F2R:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_3F2R;
break;
/* 3F/1R input */
case A52_3F1R:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_3F1R;
break;
/* other inputs */
case A52_3F:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_3F;
break;
case A52_2F1R:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_2F1R;
break;
case A52_2F2R:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_2F2R;
break;
/* unknown */
default:
audio->input_channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
}
/* add in our own LFE flag if the source has LFE */
if (audio->ac3flags & A52_LFE)
{
audio->input_channel_layout = audio->input_channel_layout | HB_INPUT_CH_LAYOUT_HAS_LFE;
}
}
snprintf( audio->lang, sizeof( audio->lang ), "%s (%s)", strlen(lang->native_name) ? lang->native_name : lang->eng_name,
audio->codec == HB_ACODEC_AC3 ? "AC3" : ( audio->codec == HB_ACODEC_MPGA ? "MPEG" : ( audio->codec == HB_ACODEC_DCA ? "DTS" : "LPCM" ) ) );
snprintf( audio->lang_simple, sizeof( audio->lang_simple ), "%s", strlen(lang->native_name) ? lang->native_name : lang->eng_name );
snprintf( audio->iso639_2, sizeof( audio->iso639_2 ), "%s", lang->iso639_2);
if ( (audio->ac3flags & A52_CHANNEL_MASK) == A52_DOLBY ) {
sprintf( audio->lang + strlen( audio->lang ),
" (Dolby Surround)" );
} else {
sprintf( audio->lang + strlen( audio->lang ),
" (%d.%d ch)",
HB_INPUT_CH_LAYOUT_GET_DISCRETE_FRONT_COUNT(audio->input_channel_layout) +
HB_INPUT_CH_LAYOUT_GET_DISCRETE_REAR_COUNT(audio->input_channel_layout),
HB_INPUT_CH_LAYOUT_GET_DISCRETE_LFE_COUNT(audio->input_channel_layout));
}
hb_log( "hb_stream_update_audio: id=%x, lang=%s, 3cc=%s, rate = %d, bitrate = %d, flags = 0x%x (%d)", audio->id, audio->lang, audio->iso639_2, audio->rate, audio->bitrate, audio->ac3flags, audio->ac3flags );
}
/***********************************************************************
* hb_stream_put_back
***********************************************************************
*
**********************************************************************/
static void hb_stream_put_back(hb_stream_t *stream, int i)
{
if (stream->stream_type == hb_stream_type_program)
{
// Program streams are pretty easy - we just reposition the source file
// pointer
fseeko(stream->file_handle, -(HB_DVD_READ_BUFFER_SIZE-i), SEEK_CUR);
}
else if (stream->stream_type == hb_stream_type_transport)
{
int read_buffer_index = stream->ps_current_read_buffer_index;
// Transport streams are a little more tricky - so long as the
// amount to back up is still within the current decode buffer
// we can just adjust the read pos.
if (stream->ps_decode_buffer[read_buffer_index].read_pos - i > 0)
{
stream->ps_decode_buffer[read_buffer_index].read_pos -= i;
}
else
hb_error("hb_stream_put_back - trying to step beyond the start of the buffer, read_pos = %d amt to put back = %d\n", stream->ps_decode_buffer[read_buffer_index].read_pos, i);
}
}
/***********************************************************************
* hb_ts_stream_init
***********************************************************************
*
**********************************************************************/
#define PS_DECODE_BUFFER_SIZE ( 1024 * 1024 * 4)
static void hb_ts_stream_init(hb_stream_t *stream)
{
// Output Program Stream
int i=0;
for (i=0; i < kNumDecodeBuffers; i++)
{
stream->ps_decode_buffer[i].data = (unsigned char *) malloc(PS_DECODE_BUFFER_SIZE);
stream->ps_decode_buffer[i].read_pos = 0;
stream->ps_decode_buffer[i].size = PS_DECODE_BUFFER_SIZE;
stream->ps_decode_buffer[i].len = 0;
stream->ps_decode_buffer[i].write_pos = 0;
}
for (i=0; i < kMaxNumberDecodeStreams; i++)
{
stream->ts_streamcont[i] = -1;
}
stream->ps_current_write_buffer_index = 0;
stream->ps_current_read_buffer_index = 1;
// Find the audio and video pids in the stream
hb_ts_stream_find_pids(stream);
for (i=0; i < stream->ts_number_video_pids; i++)
{
// In progress audio/video data during the transport stream -> program stream processing
stream->ts_packetbuf[i] = (unsigned char *) malloc(1024 * 1024);
stream->ts_streamid[i] = 0xE0; // Stream is Video
}
for (i = stream->ts_number_video_pids; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
{
stream->ts_packetbuf[i] = (unsigned char *) malloc(1024 * 1024);
stream->ts_streamid[i] = 0xBD; // Stream 1 is AC-3 Audio
}
}
// ------------------------------------------------------------------------------------
static off_t align_to_next_packet(FILE* f)
{
unsigned char buf[188*20];
off_t start = ftello(f);
off_t pos = 0;
if (fread(buf, 188*20, 1, f) == 1)
{
int found = 0;
while (!found && (pos < 188))
{
found = 1;
int i = 0;
for (i = 0; i < 188*20; i += 188)
{
unsigned char c = buf[pos+i];
// Check sync byte
if ((c != 0x47) && (c != 0x72) && (c != 0x29))
{
// this offset failed, try next
found = 0;
pos++;
break;
}
}
}
}
if (pos == 188)
pos = 0; // failed to find anything!!!!!?
fseeko(f, start+pos, SEEK_SET);
return pos;
}
// ------------------------------------------------------------------------------------
int bitpos = 0;
unsigned int bitval = 0;
unsigned char* bitbuf = NULL;
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(unsigned char* buf, int bufsize, int clear)
{
bitpos = 0;
bitbuf = buf;
bitval = (bitbuf[0] << 24) | (bitbuf[1] << 16) | (bitbuf[2] << 8) | bitbuf[3];
if (clear)
memset(bitbuf, 0, bufsize);
}
static inline int buf_size()
{
return bitpos >> 3;
}
static inline void set_bits(unsigned int val, int bits)
{
val &= bitmask[bits];
while (bits > 0)
{
int bitsleft = (8 - (bitpos & 7));
if (bits >= bitsleft)
{
bitbuf[bitpos >> 3] |= val >> (bits - bitsleft);
bitpos += bitsleft;
bits -= bitsleft;
val &= bitmask[bits];
}
else
{
bitbuf[bitpos >> 3] |= val << (bitsleft - bits);
bitpos += bits;
bits = 0;
}
}
}
static inline unsigned int get_bits(int bits)
{
unsigned int val;
int left = 32 - (bitpos & 31);
if (bits < left)
{
val = (bitval >> (left - bits)) & bitmask[bits];
bitpos += bits;
}
else
{
val = (bitval & bitmask[left]) << (bits - left);
bitpos += left;
bits -= left;
int pos = bitpos >> 3;
bitval = (bitbuf[pos] << 24) | (bitbuf[pos + 1] << 16) | (bitbuf[pos + 2] << 8) | bitbuf[pos + 3];
if (bits > 0)
{
val |= (bitval >> (32 - bits)) & bitmask[bits];
bitpos += 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 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;
}
}
int decode_program_map(hb_stream_t* stream)
{
set_buf(stream->pmt_info.tablebuf, stream->pmt_info.tablepos, 0);
unsigned char table_id = get_bits(8);
get_bits(4);
unsigned int section_length = get_bits(12);
stream->pmt_info.section_length = section_length;
unsigned int program_number = get_bits(16);
stream->pmt_info.program_number = program_number;
get_bits(2);
unsigned char version_number = get_bits(5);
get_bits(1);
unsigned char section_number = get_bits(8);
unsigned char last_section_number = get_bits(8);
get_bits(3);
unsigned int PCR_PID = get_bits(13);
stream->pmt_info.PCR_PID = PCR_PID;
get_bits(4);
unsigned int program_info_length = get_bits(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(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(8);
get_bits(3);
unsigned int elementary_PID = get_bits(13);
get_bits(4);
unsigned int ES_info_length = get_bits(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(8);
}
if (stream_type == 0x02)
{
if (stream->ts_number_video_pids <= kMaxNumberVideoPIDS)
stream->ts_number_video_pids++;
stream->ts_video_pids[stream->ts_number_video_pids-1] = elementary_PID;
}
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_number_audio_pids++;
stream->ts_audio_pids[i] = elementary_PID;
stream->ts_audio_stream_type[i] = stream_type;
if (ES_info_length > 0)
{
decode_element_descriptors(stream, i, ES_info_buf, ES_info_length);
}
}
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;
}
// ------------------------------------------------------------------------------------
int build_program_map(unsigned char *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 && stream->pmt_info.reading)
{
// 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;
}
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;
}
return 0;
}
int decode_PAT(unsigned char *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)
{
set_buf(tablebuf + pos, tablepos - pos, 0);
unsigned char section_id = get_bits(8);
get_bits(4);
unsigned int section_len = get_bits(12);
unsigned int transport_id = get_bits(16);
get_bits(2);
unsigned int version_num = get_bits(5);
unsigned int current_next = get_bits(1);
unsigned int section_num = get_bits(8);
unsigned int last_section = get_bits(8);
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(16);
stream->pat_info[stream->ts_number_pat_entries].program_number = pkt_program_num;
get_bits(3); // Reserved
if (pkt_program_num == 0)
{
unsigned int pkt_network_PID = get_bits(13);
}
else
{
unsigned int pkt_program_map_PID = get_bits(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 int flushbuf(hb_stream_t *stream)
{
int old_write_index = stream->ps_current_write_buffer_index;
// Flip the buffers and start moving on to the next
stream->ps_current_write_buffer_index++;
if (stream->ps_current_write_buffer_index > kNumDecodeBuffers-1)
stream->ps_current_write_buffer_index = 0;
if ( (stream->ps_decode_buffer[stream->ps_current_write_buffer_index].len != 0) || (stream->ps_decode_buffer[stream->ps_current_write_buffer_index].write_pos != 0) )
{
hb_log("flushbuf - new buffer (index %d) has non zero length and write position !", stream->ps_current_write_buffer_index);
return 0;
}
stream->ps_current_read_buffer_index = old_write_index;
stream->ps_decode_buffer[stream->ps_current_read_buffer_index].read_pos = 0;
return 1;
}
static int fwrite64(void* buf, int elsize, int elnum, hb_stream_t* stream)
{
int size = elsize;
if (elnum > 1)
size *= elnum;
int written = 0;
int current_write_index = stream->ps_current_write_buffer_index;
if (size <= stream->ps_decode_buffer[current_write_index].size - stream->ps_decode_buffer[current_write_index].write_pos)
{
memcpy(stream->ps_decode_buffer[current_write_index].data + stream->ps_decode_buffer[current_write_index].write_pos, buf, size);
stream->ps_decode_buffer[current_write_index].write_pos += size;
stream->ps_decode_buffer[current_write_index].len = stream->ps_decode_buffer[current_write_index].write_pos;
written = size;
}
else
{
memcpy(stream->ps_decode_buffer[current_write_index].data + stream->ps_decode_buffer[current_write_index].write_pos, buf, stream->ps_decode_buffer[current_write_index].size - stream->ps_decode_buffer[current_write_index].write_pos);
written += stream->ps_decode_buffer[current_write_index].size - stream->ps_decode_buffer[current_write_index].write_pos;
stream->ps_decode_buffer[current_write_index].write_pos += stream->ps_decode_buffer[current_write_index].size - stream->ps_decode_buffer[current_write_index].write_pos;
stream->ps_decode_buffer[current_write_index].len = stream->ps_decode_buffer[current_write_index].write_pos;
if (flushbuf(stream))
{
// FLushing the buffer will have change the current write buffer
current_write_index = stream->ps_current_write_buffer_index;
memcpy(stream->ps_decode_buffer[current_write_index].data, (unsigned char*)buf + written, size - written);
stream->ps_decode_buffer[current_write_index].write_pos += size - written;
stream->ps_decode_buffer[current_write_index].len = stream->ps_decode_buffer[current_write_index].write_pos;
written += size - written;
}
}
if (elnum == 1 && written == size)
return 1;
else
return written / elsize;
}
static int write_pack(hb_stream_t* stream, int64_t time)
{
unsigned char buf[64];
set_buf(buf, 64, 1); // clear buffer
int64_t ext_time = time % 300;
time = time / 300;
set_bits(0x000001ba, 32); // pack id 32
set_bits(1, 2); // 0x01 2
set_bits((unsigned int)(time >> 30), 3); // system_clock_reference_base 3
set_bits(1, 1); // marker_bit 1
set_bits((unsigned int)(time >> 15), 15); // system_clock_reference_base 15
set_bits(1, 1); // marker_bit 1
set_bits((unsigned int)time, 15); // system_clock_reference_base1 15
set_bits(1, 1); // marker_bit 1
set_bits((unsigned int)ext_time, 9); // system_clock_reference_extension 9
set_bits(1, 1); // marker_bit 1
set_bits(DEMUX, 22); // program_mux_rate 22
set_bits(1, 1); // marker_bit 1
set_bits(1, 1); // marker_bit 1
set_bits(31, 5); // reserved 5
set_bits(0, 3); // pack_stuffing_length 3
return fwrite64(buf, buf_size(), 1, stream) == 1;
}
static int pad_buffer(hb_stream_t *stream, int pad)
{
pad -= 6;
char buf[6];
buf[0] = '\x0'; buf[1] = '\x0'; buf[2] = '\x1'; buf[3] = '\xbe';
buf[4] = pad >> 8; buf[5] = pad & 0xff;
if (fwrite64(buf, 6, 1, stream) != 1)
return 0;
unsigned char padbyte = 0xff;
int i=0;
for (i = 0; i < pad; i++)
{
if (fwrite64(&padbyte, 1, 1, stream) != 1)
return 0;
}
return 1;
}
int make_pes_header(unsigned char* buf, int streamid, int len, int64_t PTS, int64_t DTS)
{
int hdrlen = 0;
int PTS_DTS_flags = 0;
if (PTS != -1)
{
if (DTS != -1)
{
PTS_DTS_flags = 3;
hdrlen += 10;
}
else
{
PTS_DTS_flags = 2;
hdrlen += 5;
}
}
set_buf(buf, 9 + hdrlen, 1); // clear the buffer
set_bits(0x000001, 24); // packet_start_code_prefix 24
set_bits((unsigned int)streamid, 8); // directory_stream_id 8
set_bits(len, 16); // PES_packet_length 16
set_bits(0x2, 2); // '10' 2
set_bits(0, 2); // PES_scrambling_control 2
set_bits(1, 1); // PES_priority 1
set_bits(0, 1); // data_alignment_indicator 1
set_bits(0, 1); // copyright 1
set_bits(0, 1); // original_or_copy 1
set_bits(PTS_DTS_flags, 2); // PTS_DTS_flags 2
set_bits(0, 1); // ESCR_flag 1
set_bits(0, 1); // ES_rate_flag 1
set_bits(0, 1); // DSM_trick_mode_flag 1
set_bits(0, 1); // additional_copy_info_flag 1
set_bits(0, 1); // PES_CRC_flag 1
set_bits(0, 1); // PES_extension_flag 1
set_bits(hdrlen, 8); // PES_header_data_length 8
if (PTS_DTS_flags == 2)
{
set_bits(2, 4); // '0010' 4
set_bits((unsigned int)(PTS >> 30), 3); // PTS [32..30] 3
set_bits(1, 1); // marker bit 1
set_bits((unsigned int)(PTS >> 15), 15); // PTS [29..15] 15
set_bits(1, 1); // marker bit 1
set_bits((unsigned int)PTS, 15); // PTS [14..0] 15
set_bits(1, 1); // marker bit 1
}
else if (PTS_DTS_flags == 3)
{
set_bits(3, 4); // '0011' 4
set_bits((unsigned int)(PTS >> 30), 3); // PTS [32..30] 3
set_bits(1, 1); // marker bit 1
set_bits((unsigned int)(PTS >> 15), 15); // PTS [29..15] 15
set_bits(1, 1); // marker bit 1
set_bits((unsigned int)PTS, 15); // PTS [14..0] 15
set_bits(1, 1); // marker bit 1
set_bits(1, 4); // '0001' 4
set_bits((unsigned int)(DTS >> 30), 3); // DTS [32..30] 3
set_bits(1, 1); // marker bit 1
set_bits((unsigned int)(DTS >> 15), 15); // DTS [29..15] 15
set_bits(1, 1); // marker bit 1
set_bits((unsigned int)DTS, 15); // DTS [14..0] 15
set_bits(1, 1); // marker bit 1
}
return buf_size();
}
int generate_output_data(hb_stream_t *stream, int write_ac3, int curstream, int pid)
{
unsigned char ac3_substream_id[4];
int ac3len = 0;
if (write_ac3)
{
// Make a four byte DVD ac3 stream header
int ssid = (curstream - stream->ts_number_video_pids) & 0xf;
ac3_substream_id[0] = 0x80 | ssid; // substream id
ac3_substream_id[1] = 0x01; // number of sync words
ac3_substream_id[2] = 0x00; // first offset (16 bits)
ac3_substream_id[3] = 0x02;
ac3len = 4;
}
int written = 0; // Bytes we've written to output file
int pos = 0; // Position in PES packet buffer
for (;;)
{
if ((stream->ps_decode_buffer[stream->ps_current_write_buffer_index].len % HB_DVD_READ_BUFFER_SIZE) != 0)
{
hb_log("write_output_stream - Packet's not falling on read buffer size boundries!");
return 1;
}
// Get total length of this pack
int len = min(14 + ac3len + stream->ts_packetpos[curstream] - pos, HB_DVD_READ_BUFFER_SIZE);
// Figure out stuffing (if we have less than 16 bytes left)
int stuffing = 0;
if (len < HB_DVD_READ_BUFFER_SIZE && HB_DVD_READ_BUFFER_SIZE - len < 16)
{
stuffing = HB_DVD_READ_BUFFER_SIZE - len;
len += stuffing;
}
// Write out pack header
off_t file_offset = ftello(stream->file_handle);
int64_t packet_time = (file_offset * CLOCKRATE / STREAMRATE) + 0 /*file_time*/;
if (!write_pack(stream, packet_time))
{
hb_log("write_output_stream - Couldn't write pack header!");
return 1;
}
int index_of_selected_pid = -1;
if ((index_of_selected_pid = index_of_video_pid(pid,stream)) < 0)
{
if ((index_of_selected_pid = index_of_audio_pid(pid,stream)) < 0)
{
hb_log("generate_output_data - cannot find pid 0x%x (%d) in selected audio or video pids", pid, pid);
return 0;
}
else
{
stream->ts_packetbuf[curstream][pos + 3] = stream->ts_streamid[stream->ts_number_video_pids + index_of_selected_pid];
}
}
else
stream->ts_packetbuf[curstream][pos + 3] = stream->ts_streamid[index_of_selected_pid];
// Packet length..
// Subtract pack size (14) and pes id and len (6) from lenth
stream->ts_packetbuf[curstream][pos + 4] = (len - 6 - 14) >> 8; stream->ts_packetbuf[curstream][pos + 5] = (len - 6 - 14) & 0xFF;
// Add any stuffing bytes to header extra len
int hdrsize = 9 + stream->ts_packetbuf[curstream][pos + 8];
stream->ts_packetbuf[curstream][pos + 8] += stuffing; // Add stuffing to header bytes
// Write out id, streamid, len
if (fwrite64(stream->ts_packetbuf[curstream] + pos, hdrsize, 1, stream) != 1) // Write pes id, streamid, and len
{
hb_log("write_output_stream - Failed to write output file!");
return 1;
}
// Write stuffing
int i=0;
for (i = 0; i < stuffing; i++) // Write any stuffing bytes
{
unsigned char stuff = 0xff;
if (fwrite64(&stuff, 1, 1, stream) != 1)
{
hb_log("write_output_stream - Failed to write output file!");
return 1;
}
}
// Write ac3 streamid
if (ac3len != 0)
{
if (fwrite64(ac3_substream_id, ac3len, 1, stream) != 1)
{
hb_log("write_output_stream - Failed to write output file!");
return 1;
}
}
// Write rest of data len minus headersize (9) stuffing, and pack size (14)
if (fwrite64(stream->ts_packetbuf[curstream] + pos + hdrsize, len - hdrsize - 14 - stuffing - ac3len, 1, stream) != 1) // Write data bytes
{
hb_log("write_output_stream - Failed to write output file!");
return 1;
}
written += len;
// Add len minus stuff we added like the pack (14) and the stuffing.
pos += len - 14 - stuffing - ac3len;
if (pos == stream->ts_packetpos[curstream])
break;
// Add pes header for next packet
pos -= 9;
// make_pes_header(stream->ts_packetbuf[curstream] + pos, (pid == stream->ts_video_pids[0] ? stream->ts_streamid[kVideoStream] : stream->ts_streamid[kAudioStream]), 0, -1, -1);
make_pes_header(stream->ts_packetbuf[curstream] + pos, stream->ts_streamid[curstream], 0, -1, -1);
}
// Write padding
if ((written % HB_DVD_READ_BUFFER_SIZE) != 0)
{
int left = HB_DVD_READ_BUFFER_SIZE - (written % HB_DVD_READ_BUFFER_SIZE);
// Pad out to HB_DVD_READ_BUFFER_SIZE bytes
if (!pad_buffer(stream, left))
{
hb_log("write_output_stream - Couldn't write pad buffer!");
return 1;
}
}
stream->ts_packetpos[curstream] = 0;
stream->ts_streamcont[curstream] = -1;
return 0;
}
static void hb_ts_handle_mpeg_audio(hb_stream_t *stream, int curstream, unsigned char* buf, int adapt_len )
{
// Although we don't have AC3/A52 audio here we can still use the same structure to record this useful information.
stream->a52_info[curstream - stream->ts_number_video_pids].flags = A52_STEREO;
stream->a52_info[curstream - stream->ts_number_video_pids].rate = 48000 /*Hz*/;
stream->a52_info[curstream - stream->ts_number_video_pids].bitrate = 384000 /*Bps*/;
}
static int hb_ts_handle_ac3_audio(hb_stream_t *stream, int curstream, unsigned char* buf, int adapt_len )
{
int spos, dpos;
// Make sure we start with 0x0b77
if (stream->ts_packetbuf[curstream][9 + stream->ts_packetbuf[curstream][8]] != 0x0b || stream->ts_packetbuf[curstream][9 + stream->ts_packetbuf[curstream][8] + 1] != 0x77)
{
spos = 9 + stream->ts_packetbuf[curstream][8];
dpos = 9 + stream->ts_packetbuf[curstream][8];
while (spos <= stream->ts_packetpos[curstream] - 2 && !(stream->ts_packetbuf[curstream][spos] == 0x0b && stream->ts_packetbuf[curstream][spos + 1] == 0x77))
spos++;
if (!(stream->ts_packetbuf[curstream][spos] == 0x0b && stream->ts_packetbuf[curstream][spos + 1] == 0x77))
{
hb_log("hb_ts_stream_decode - Couldn't sync AC3 packet!");
stream->ts_skipbad[curstream] = 1;
return 0;
}
while (spos < stream->ts_packetpos[curstream])
{
stream->ts_packetbuf[curstream][dpos] = stream->ts_packetbuf[curstream][spos];
spos++;
dpos++;
}
stream->ts_packetpos[curstream] = dpos;
}
// Check the next packet to make sure IT starts with a 0x0b77
int plen = 0;
// if (buf[4 + adapt_len] == 0 && buf[4 + adapt_len + 1] == 0 && // Starting with an mpeg header?
// buf[4 + adapt_len + 2] == 1 && buf[4 + adapt_len + 3] == 0xBD)
plen = 9 + buf[4 + adapt_len + 8];
int pstart = 4 + adapt_len + plen;
if (buf[pstart] != 0x0b || buf[pstart + 1] != 0x77)
{
spos = pstart;
while (spos < 188 - 2 && !(buf[spos] == 0x0b && buf[spos + 1] == 0x77))
{
stream->ts_packetbuf[curstream][stream->ts_packetpos[curstream]] = buf[spos];
stream->ts_packetpos[curstream]++;
spos++;
}
if (!(buf[spos] == 0x0b && buf[spos + 1] == 0x77))
{
hb_log("hb_ts_stream_decode - Couldn't sync AC3 packet!");
stream->ts_skipbad[curstream] = 1;
return 0;
}
adapt_len = spos - 4 - plen;
dpos = spos - 1;
spos = pstart - 1;
while (spos >= pstart - plen)
{
buf[dpos] = buf[spos];
spos--;
dpos--;
}
}
int flags, rate, bitrate;
if( a52_syncinfo( &buf[pstart], &flags, &rate, &bitrate ) )
{
stream->a52_info[curstream - stream->ts_number_video_pids].flags = flags;
stream->a52_info[curstream - stream->ts_number_video_pids].rate = rate;
stream->a52_info[curstream - stream->ts_number_video_pids].bitrate = bitrate;
}
return 1;
}
static void hb_ts_stream_find_pids(hb_stream_t *stream)
{
unsigned char buf[188];
// align to first packet
align_to_next_packet(stream->file_handle);
// 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
int bytesReadInPacket = 0;
for (;;)
{
// Try to read packet..
int bytesRead;
if ((bytesRead = fread(buf+bytesReadInPacket, 1, 188-bytesReadInPacket, stream->file_handle)) != 188-bytesReadInPacket)
{
if (bytesRead < 0)
bytesRead = 0;
bytesReadInPacket += bytesRead;
hb_log("hb_ts_stream_find_pids - end of file");
break;
}
else
{
bytesReadInPacket = 0;
}
// Check sync byte
if ((buf[0] != 0x47) && (buf[0] != 0x72) && (buf[0] != 0x29))
{
hb_log("hb_ts_stream_find_pids - Bad transport packet (no sync byte 0x47)!");
int i = 0;
for (i=0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
stream->ts_skipbad[i] = 1;
continue;
}
// 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 (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=0;
for (i=0; i < stream->ts_number_video_pids; i++)
{
hb_log(" 0x%x (%d)", stream->ts_video_pids[i], stream->ts_video_pids[i]);
}
hb_log(" Audio PIDS : ");
for (i = 0; i < stream->ts_number_audio_pids; i++)
{
hb_log(" 0x%x (%d)", stream->ts_audio_pids[i], stream->ts_audio_pids[i]);
}
}
int index_of_video_pid(int pid, hb_stream_t *stream)
{
int found_pid = -1, i = 0;
for (i = 0; (i < stream->ts_number_video_pids) && (found_pid < 0); i++)
{
if (pid == stream->ts_video_pids[i])
found_pid = i;
}
return found_pid;
}
int index_of_audio_pid(int pid, hb_stream_t *stream)
{
int i = 0, found_pid = -1;
for (i = 0; (i < stream->ts_number_audio_pids) && (found_pid < 0); i++)
{
if (pid == stream->ts_audio_pids[i])
found_pid = i;
}
return found_pid;
}
int index_of_pid(int pid, hb_stream_t *stream)
{
int found_pid = -1;
if ((found_pid = index_of_video_pid(pid, stream)) >= 0)
return found_pid;
if ((found_pid = index_of_audio_pid(pid, stream)) >= 0)
return found_pid;
return found_pid;
}
/***********************************************************************
* hb_ts_stream_decode
***********************************************************************
*
**********************************************************************/
static void hb_ts_stream_decode(hb_stream_t *stream)
{
unsigned char buf[188];
int curstream;
int doing_iframe;
int i = 0;
for (i=0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
{
// stream->ts_skipbad[kAudioStream] = stream->ts_skipbad[kVideoStream] = 0;
stream->ts_skipbad[i] = 0;
}
doing_iframe = 0;
if ((stream->ts_number_video_pids == 0) || (stream->ts_number_audio_pids == 0))
{
hb_log("hb_ts_stream_decode - no Video or Audio PID selected, cannot decode transport stream");
return;
}
int curr_write_buffer_index = stream->ps_current_write_buffer_index;
// Write output data until a buffer switch occurs.
while (curr_write_buffer_index == stream->ps_current_write_buffer_index)
{
if ((fread(buf, 188, 1, stream->file_handle)) != 1)
{
// 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");
stream->ps_decode_buffer[stream->ps_current_write_buffer_index].len = 0;
return;
}
// Check sync byte
if ((buf[0] != 0x47) && (buf[0] != 0x72) && (buf[0] != 0x29))
{
off_t pos = ftello(stream->file_handle);
hb_log("hb_ts_stream_decode - no sync byte 0x47 @ %lld", pos);
for (i=0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
{
// stream->ts_skipbad[kAudioStream] = stream->ts_skipbad[kVideoStream] = 1;
stream->ts_skipbad[i] = 1;
}
continue;
}
// Get pid
int pid = (((buf[1] & 0x1F) << 8) | buf[2]) & 0x1FFF;
// Get the pos and buf - we organize our streams as 'n' video streams then 'm' audio streams
int index_of_selected_pid;
if ((index_of_selected_pid = index_of_video_pid(pid,stream)) < 0)
{
// Not a video PID perhaps audio ?
if ((index_of_selected_pid = index_of_audio_pid(pid,stream)) < 0)
{
// not a pid we want
continue;
}
else
{
curstream = stream->ts_number_video_pids + index_of_selected_pid;
}
}
else
curstream = index_of_selected_pid;
// Get start code
int start;
start = (buf[1] & 0x40) != 0;
if (!start && stream->ts_skipbad[curstream])
continue;
// Get error
int errorbit = (buf[1] & 0x80) != 0;
if (errorbit)
{
hb_log("hb_ts_stream_decode - Error bit set in packet");
stream->ts_skipbad[curstream] = 1;
continue;
}
// Get adaption header info
int adaption = (buf[3] & 0x30) >> 4;
int adapt_len = 0;
// Get continuity
// Continuity only increments for adaption values of 0x3 or 0x01
int continuity = (buf[3] & 0xF);
if ((stream->ts_streamcont[curstream] != -1) && ((adaption & 0x01) != 0))
{
if (continuity != ((stream->ts_streamcont[curstream] + 1) & 0xF))
{
hb_log("hb_ts_stream_decode - Bad continuity code in packet");
stream->ts_skipbad[curstream] = 1;
continue;
}
stream->ts_streamcont[curstream] = continuity;
}
// Get adaption header size
if (adaption == 0)
{
hb_log("hb_ts_stream_decode - Bad adaption code (code was 0)!");
for (i=0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
{
stream->ts_skipbad[i] = 1;
}
// stream->ts_skipbad[kAudioStream] = stream->ts_skipbad[kVideoStream] = 1;
continue;
}
else if (adaption == 0x2)
adapt_len = 184;
else if (adaption == 0x3)
{
adapt_len = buf[4] + 1;
if (adapt_len > 184)
{
hb_log("hb_ts_stream_decode - Invalid adapt len (was > 183)!");
for (i=0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
{
stream->ts_skipbad[i] = 1;
}
// stream->ts_skipbad[kAudioStream] = stream->ts_skipbad[kVideoStream] = 1;
}
}
// HBO is slick, it doesn't bother to sync AC3 packets with PES elementary stream packets.. so
// we have to swizzle them together! (ARGHH!)
// if (pid == stream->ts_audio_pids[0] && start)
if ((index_of_audio_pid(pid, stream) >= 0) && start)
{
// Is there an AC3 packet start 0b77 code in this packet??
int sync_found = 0;
unsigned char *p = buf + 4 + adapt_len;
while (p <= buf + 186)
{
if (p[0] == 0x0b && p[1] == 0x77)
{
sync_found = 1;
break;
}
p++;
}
// Couldn't find an AC3 sync start in this packet.. don't make a PES packet!
if (!sync_found)
{
// int pos = ftell(fin);
// error("AC3 packet sync not found in start frame");
// return 1;
adapt_len += 9 + buf[4 + adapt_len + 8];
start = 0;
}
}
// Found a random access point (now we can start a frame/audio packet..)
if (start)
{
// Check to see if this is an i_frame (group of picture start)
if (pid == stream->ts_video_pids[0])
{
// printf("Found Video Start for pid 0x%x\n", pid);
// Look for the Group of Pictures packet.. indicates this is an I-Frame packet..
doing_iframe = 0;
unsigned int strid = 0;
int i = 4;
for (i = 4 + adapt_len; i < 188; i++)
{
strid = (strid << 8) | buf[i];
if (strid == 0x000001B8) // group_start_code
{
// found a Group of Pictures header, subsequent picture must be an I-frame
doing_iframe = 1;
}
else if (strid == 0x000001B3) // sequence_header code
{
doing_iframe = 1;
}
else if (strid == 0x00000100) // picture_start_code
{
// picture_header, let's see if it's an I-frame
if (i<187)
{
// int pic_start_code = (buf[i+2] >> 3) & 0x07;
// hb_log("hb_ts_stream_decode - picture_start_code header value = 0x%x (%d)", pic_start_code, pic_start_code);
// check if picture_coding_type == 1
if ((buf[i+2] & (0x7 << 3)) == (1 << 3))
{
// found an I-frame picture
doing_iframe = 1;
}
}
}
if (doing_iframe)
{
if (!stream->ts_foundfirst[curstream])
{
stream->ts_foundfirst[curstream] = 1;
// first_video_PCR = PCR;
}
break;
}
}
}
else if (index_of_audio_pid(pid, stream) >= 0)
{
if (stream->ts_foundfirst[0]) // Set audio found first ONLY after first video frame found. There's an assumption here that stream '0' is a video stream
{
stream->ts_foundfirst[curstream] |= 1;
}
}
// 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;
stream->ts_packetpos[curstream] = 0;
}
// Get the continuity code of this packet
stream->ts_streamcont[curstream] = continuity;
}
// Write a 2048 byte program stream packet..
if (start && stream->ts_packetpos[curstream] > 0 && stream->ts_foundfirst[curstream] && !stream->ts_skipbad[curstream])
{
// Save the substream id block so we can added it to subsequent blocks
int write_ac3 = 0;
// if (pid == stream->ts_audio_pids[0] /*&& audstreamid == 0xBD*/)
if (index_of_audio_pid(pid, stream) >= 0)
{
// Curstream is a zero based index of streams and includes both video and audio streams, so we must subtract the numver of video streams
// from the indes value used here since ts_audio_stream_type is indexed only by audio streams.
if (stream->ts_audio_stream_type[curstream - stream->ts_number_video_pids] == 0x03)
{
hb_ts_handle_mpeg_audio(stream, curstream, buf, adapt_len);
}
else
{
write_ac3 = hb_ts_handle_ac3_audio(stream, curstream, buf, adapt_len);
}
}
if (generate_output_data(stream, write_ac3, curstream, pid) != 0)
return ;
}
// Add the payload for this packet to the current buffer
if (stream->ts_foundfirst[curstream] && (184 - adapt_len) > 0)
{
memcpy(stream->ts_packetbuf[curstream] + stream->ts_packetpos[curstream], buf + 4 + adapt_len, 184 - adapt_len);
stream->ts_packetpos[curstream] += 184 - adapt_len;
}
}
}
/***********************************************************************
* hb_ts_stream_reset
***********************************************************************
*
**********************************************************************/
static void hb_ts_stream_reset(hb_stream_t *stream)
{
int i=0;
for (i=0; i < kNumDecodeBuffers; i++)
{
stream->ps_decode_buffer[i].read_pos = 0;
stream->ps_decode_buffer[i].write_pos = 0;
stream->ps_decode_buffer[i].len = 0;
}
for (i=0; i < kMaxNumberDecodeStreams; i++)
{
stream->ts_streamcont[i] = -1;
}
stream->ps_current_write_buffer_index = 0;
stream->ps_current_read_buffer_index = 1;
align_to_next_packet(stream->file_handle);
}