// Return TRUE if all was read. FALSE if a problem occured:
// If a bitstream syntax problem occured the bitstream will
// point to after the problem, in case we run out of data the bitstream
// will point to where we want to restart after getting more.
static int read_pic_info(struct bitstream *esstream)
{
dbg_print(DMT_VERBOSE, "Read PIC Info\n");
// We only get here after seeing that start code
if (next_u32(esstream) != 0x00010000) // LSB first (0x00000100)
fatal(EXIT_BUG_BUG, "Impossible!");
// If we get here esstream points to the start of a group_start_code
// should we run out of data in esstream this is where we want to restart
// after getting more.
unsigned char *pic_info_start = esstream->pos;
pic_header(esstream);
pic_coding_ext(esstream);
if (esstream->error)
return 0;
if (esstream->bitsleft < 0)
{
init_bitstream(esstream, pic_info_start, esstream->end);
return 0;
}
// Analyse/use the picture information
static int maxtref; // Use to remember the temporal reference number
// A new anchor frame - flush buffered caption data. Might be flushed
// in GOP header already.
if (picture_coding_type==I_FRAME || picture_coding_type==P_FRAME)
{
// if (((picture_structure != 0x1) && (picture_structure != 0x2)) ||
// (temporal_reference != current_tref))
// {
// NOTE: process_hdcc() needs to be called before set_fts() as it
// uses fts_now to re-create the timeline !!!!!
if (has_ccdata_buffered)
{
process_hdcc();
}
anchor_hdcc(temporal_reference);
// }
}
current_tref = temporal_reference;
current_picture_coding_type = picture_coding_type;
// We mostly use PTS, but when the GOP mode is enabled do not set
// the FTS time here.
if (!use_gop_as_pts)
{
set_fts(); // Initialize fts
}
dbg_print(DMT_VIDES, "PTS: %s (%8u) - tref: %2d - %s since tref0/GOP: %2u/%2u",
print_mstime(current_pts/(MPEG_CLOCK_FREQ/1000)),
unsigned(current_pts), temporal_reference,
pict_types[picture_coding_type],
unsigned(frames_since_ref_time),
unsigned(frames_since_last_gop));
dbg_print(DMT_VIDES, " t:%d r:%d p:%d", top_field_first,
repeat_first_field, progressive_frame);
dbg_print(DMT_VIDES, " FTS: %s\n", print_mstime(get_fts()));
// Set min_pts/sync_pts according to the current time stamp.
// Use fts_at_gop_start as reference when a GOP header was seen
// since the last frame 0. If not this is most probably a
// TS without GOP headers but with USER DATA after each picture
// header. Use the current FTS values as reference.
// Note: If a GOP header was present the reference time is from
// the beginning of the GOP, otherwise it is now.
if(temporal_reference == 0)
{
last_gop_length = maxtref + 1;
maxtref = temporal_reference;
// frames_since_ref_time is used in set_fts()
if( saw_gop_header )
{
// This time (fts_at_gop_start) that was set in the
// GOP header and it might be off by one GOP. See the comment there.
frames_since_ref_time = frames_since_last_gop; // Should this be 0?
}
else
{
// No GOP header, use the current values
fts_at_gop_start=get_fts();
frames_since_ref_time = 0;
}
if (debug_mask & DMT_TIME)
{
dbg_print(DMT_TIME, "\nNew temporal reference:\n");
print_debug_timing();
}
saw_gop_header = 0; // Reset the value
}
if ( !saw_gop_header && picture_coding_type==I_FRAME )
{
// A new GOP beginns with an I-frame. Lets hope there are
// never more than one per GOP
frames_since_last_gop = 0;
}
// Set maxtref
if( temporal_reference > maxtref ) {
maxtref = temporal_reference;
if (maxtref+1 > max_gop_length)
max_gop_length = maxtref+1;
}
unsigned extraframe = 0;
if (repeat_first_field)
{
pulldownfields++;
total_pulldownfields++;
if ( current_progressive_sequence || !(total_pulldownfields%2) )
extraframe = 1;
if ( current_progressive_sequence && top_field_first )
extraframe = 2;
dbg_print(DMT_VIDES, "Pulldown: total pd fields: %d - %d extra frames\n",
total_pulldownfields, extraframe);
}
total_pulldownframes += extraframe;
total_frames_count += 1+extraframe;
frames_since_last_gop += 1+extraframe;
frames_since_ref_time += 1+extraframe;
dbg_print(DMT_VERBOSE, "Read PIC Info - processed\n\n");
return 1;
}
// Return TRUE if all was read. FALSE if a problem occured:
// If a bitstream syntax problem occured the bitstream will
// point to after the problem, in case we run out of data the bitstream
// will point to where we want to restart after getting more.
static int read_pic_info(struct lib_cc_decode *ctx, struct bitstream *esstream, struct cc_subtitle *sub)
{
debug("Read PIC Info\n");
// We only get here after seeing that start code
if (next_u32(esstream) != 0x00010000) // LSB first (0x00000100)
fatal(CCX_COMMON_EXIT_BUG_BUG, "In read_pic_info: next_u32(esstream) != 0x00010000. Please file a bug report in GitHub.\n");
// If we get here esstream points to the start of a group_start_code
// should we run out of data in esstream this is where we want to restart
// after getting more.
unsigned char *pic_info_start = esstream->pos;
pic_header(ctx, esstream);
pic_coding_ext(ctx, esstream);
if (esstream->error)
return 0;
if (esstream->bitsleft < 0)
{
init_bitstream(esstream, pic_info_start, esstream->end);
return 0;
}
// A new anchor frame - flush buffered caption data. Might be flushed
// in GOP header already.
if (ctx->picture_coding_type==CCX_FRAME_TYPE_I_FRAME || ctx->picture_coding_type==CCX_FRAME_TYPE_P_FRAME)
{
if (((ctx->picture_structure != 0x1) && (ctx->picture_structure != 0x2)) ||
(ctx->temporal_reference != ctx->timing->current_tref))
{
// NOTE: process_hdcc() needs to be called before set_fts() as it
// uses fts_now to re-create the timeline !!!!!
if (ctx->has_ccdata_buffered)
{
process_hdcc(ctx, sub);
}
anchor_hdcc(ctx, ctx->temporal_reference);
}
}
ctx->timing->current_tref = ctx->temporal_reference;
ctx->timing->current_picture_coding_type = ctx->picture_coding_type;
// We mostly use PTS, but when the GOP mode is enabled do not set
// the FTS time here.
if (ccx_options.use_gop_as_pts!=1)
{
set_fts(ctx->timing); // Initialize fts
}
dbg_print(CCX_DMT_VIDES, " t:%d r:%d p:%d", ctx->top_field_first,
ctx->repeat_first_field, ctx->progressive_frame);
dbg_print(CCX_DMT_VIDES, " FTS: %s\n", print_mstime_static(get_fts(ctx->timing, ctx->current_field)));
// Set min_pts/sync_pts according to the current time stamp.
// Use fts_at_gop_start as reference when a GOP header was seen
// since the last frame 0. If not this is most probably a
// TS without GOP headers but with USER DATA after each picture
// header. Use the current FTS values as reference.
// Note: If a GOP header was present the reference time is from
// the beginning of the GOP, otherwise it is now.
if(ctx->temporal_reference == 0)
{
ctx->last_gop_length = ctx->maxtref + 1;
ctx->maxtref = ctx->temporal_reference;
// frames_since_ref_time is used in set_fts()
if( ctx->saw_gop_header )
{
// This time (fts_at_gop_start) that was set in the
// GOP header and it might be off by one GOP. See the comment there.
frames_since_ref_time = ctx->frames_since_last_gop; // Should this be 0?
}
else
{
// No GOP header, use the current values
fts_at_gop_start = get_fts(ctx->timing, ctx->current_field);
frames_since_ref_time = 0;
}
if (ccx_options.debug_mask & CCX_DMT_TIME)
{
dbg_print(CCX_DMT_TIME, "\nNew temporal reference:\n");
print_debug_timing(ctx->timing);
}
ctx->saw_gop_header = 0; // Reset the value
}
if ( !ctx->saw_gop_header && ctx->picture_coding_type==CCX_FRAME_TYPE_I_FRAME )
{
// A new GOP beginns with an I-frame. Lets hope there are
// never more than one per GOP
ctx->frames_since_last_gop = 0;
}
// Set maxtref
if( ctx->temporal_reference > ctx->maxtref ) {
ctx->maxtref = ctx->temporal_reference;
if (ctx->maxtref + 1 > ctx->max_gop_length)
ctx->max_gop_length = ctx->maxtref + 1;
}
unsigned extraframe = 0;
if (ctx->repeat_first_field)
{
ctx->pulldownfields++;
ctx->total_pulldownfields++;
if ( ctx->current_progressive_sequence || !(ctx->total_pulldownfields%2) )
extraframe = 1;
if ( ctx->current_progressive_sequence && ctx->top_field_first )
extraframe = 2;
dbg_print(CCX_DMT_VIDES, "Pulldown: total pd fields: %d - %d extra frames\n",
ctx->total_pulldownfields, extraframe);
}
ctx->total_pulldownframes += extraframe;
total_frames_count += 1+extraframe;
ctx->frames_since_last_gop += 1+extraframe;
frames_since_ref_time += 1+extraframe;
debug("Read PIC Info - processed\n\n");
return 1;
}
