int last_error_count; /* # errors at last error message */
int packetsize; /* Transport Stream packet size */
- int8_t need_keyframe; // non-zero if want to start at a keyframe
- int8_t ts_no_RAP; // non-zero if there are no random access points
-
- int8_t ts_found_pcr; // non-zero if we've found at least one input pcr
+ 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
*/
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];
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
{
}
}
-/*
- * scan the next MB of 'stream' to try to find a random access point
- */
-static void hb_ts_stream_find_RAP( hb_stream_t *stream )
+static int isIframe( hb_stream_t *stream, const uint8_t *buf, int adapt_len )
{
- off_t starting_point = ftello(stream->file_handle);
- int npack = 300000; // max packets to read
+ // 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;
- while (--npack >= 0)
+
+ if ( stream->ts_stream_type[0] <= 2 )
{
- off_t cur = ftello(stream->file_handle);
- const uint8_t *buf = next_packet( stream );
- if ( buf == NULL )
- {
- break;
- }
- switch (buf[3] & 0x30)
+ // This section of the code handles MPEG-1 and MPEG-2 video streams
+ for (i = 13 + adapt_len; i < 188; i++)
{
- case 0x00: // illegal
- continue;
-
- case 0x20: // fill packet
- case 0x30: // adaptation
- if ( buf[5] & 0x40 )
+ strid = (strid << 8) | buf[i];
+ if ( ( strid >> 8 ) == 1 )
+ {
+ // we found a start code
+ uint8_t id = strid;
+ switch ( id )
{
- // found a random access point
- fseeko( stream->file_handle, cur, SEEK_SET );
- return;
+ 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;
}
- continue;
+ }
+ }
+ // 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;
}
- /* didn't find it */
- fseeko( stream->file_handle, starting_point, SEEK_SET );
- stream->ts_no_RAP = 1;
+ // we don't understand the stream type so just say "yes" otherwise
+ // we'll discard all the video.
+ return 1;
}
/*
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 || (buf[1] & 0x1f) != (pid >> 8) ||
- buf[2] != (pid & 0xff))
+ if ((buf[1] & 0x40) == 0 || pack_pid != pid )
{
// not a start packet or not the pid we want
continue;
uint64_t pts; /* PTS from video stream */
};
-#define NDURSAMPLES 64
+#define NDURSAMPLES 128
// get one (position, timestamp) sampple from a transport or program
// stream.
( ( (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
{
hb_ts_stream_reset(stream);
if ( f > 0 )
{
- if ( !stream->ts_no_RAP )
+ if ( stream->ts_IDRs )
{
- // we're not at the beginning - try to find a random access point
- hb_ts_stream_find_RAP( stream );
+ // the stream has IDRs so look for one.
+ stream->need_keyframe = 1;
}
- stream->need_keyframe = 1;
}
else
{
stream->ts_buf[curstream]->size = 0;
}
-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: ???
- 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;
-
- if ( stream->packetsize == 192 )
- {
- // m2ts files have idr frames so keep looking for one
- continue;
- }
-
- // h.264 in ts files (ATSC or DVB video) often seem to be
- // missing IDR frames so look for at least an I
- if ( nal_type == 0x01 )
- {
- // h.264 slice: has to be start MB 0 & type I (2, 4, 7 or 9)
- uint8_t id = buf[i+1];
- if ( ( id >> 4 ) == 0x0b || ( id >> 2 ) == 0x25 ||
- id == 0x88 || id == 0x8a )
- {
- 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;
-}
-
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)
}
}
- // If we don't have a pcr yet, the right thing to do here would
- // be a 'continue' so we don't process anything until we have a
- // clock reference. Unfortunately the HD Home Run appears to null
- // out the pcr field of some streams so we keep going & substitute
- // the video stream dts for the pcr when there's no pcr.
+ // 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
{
// we're looking for the first video frame because we're
// doing random access during 'scan'
- if (curstream != 0 || !isIframe( stream, buf, adapt_len ) )
+ if ( curstream != 0 || !isIframe( stream, buf, adapt_len ) )
{
// not the video stream or didn't find an I frame
- continue;
+ // but we'll only wait 255 video frames for an I frame.
+ if ( curstream != 0 || ++stream->need_keyframe )
+ {
+ continue;
+ }
}
stream->need_keyframe = 0;
}
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