// Return TRUE if the data parsing finished, FALSE otherwise.
// estream->pos is advanced. Data is only processed if esstream->error
// is FALSE, parsing can set esstream->error to TRUE.
static int sequence_header(struct bitstream *esstream)
{
dbg_print(DMT_VERBOSE, "Sequence header\n");
if (esstream->error || esstream->bitsleft <= 0)
return 0;
// We only get here after seeing that start code
if (read_u32(esstream) != 0xB3010000) // LSB first (0x000001B3)
fatal(EXIT_BUG_BUG, "Impossible!");
unsigned hor_size = (unsigned) read_bits(esstream,12);
unsigned vert_size = (unsigned) read_bits(esstream,12);
unsigned aspect_ratio = (unsigned) read_bits(esstream,4);
unsigned frame_rate = (unsigned) read_bits(esstream,4);
// Discard some information
read_bits(esstream, 18+1+10+1);
// load_intra_quantiser_matrix
if (read_bits(esstream,1))
skip_bits(esstream, 8*64);
// load_non_intra_quantiser_matrix
if (read_bits(esstream,1))
skip_bits(esstream, 8*64);
if (esstream->bitsleft < 0)
return 0;
// If we got the whole sequence, process
if (hor_size!=current_hor_size ||
vert_size!=current_vert_size ||
aspect_ratio!=current_aspect_ratio ||
frame_rate!=current_frame_rate)
{
// If horizontal/vertical size, framerate and/or aspect
// ratio are ilegal, we discard the
// whole sequence info.
if (vert_size >= 288 && vert_size <= 1088 &&
hor_size >= 352 && hor_size <= 1920 &&
hor_size / vert_size >= 352/576 && hor_size / vert_size <= 2 &&
frame_rate>0 && frame_rate<9 &&
aspect_ratio>0 && aspect_ratio<5)
{
mprint ("\n\nNew video information found");
if (pts_set==2)
{
unsigned cur_sec = (unsigned) ((current_pts - min_pts)
/ MPEG_CLOCK_FREQ);
mprint (" at %02u:%02u",cur_sec/60, cur_sec % 60);
}
mprint ("\n");
mprint ("[%u * %u] [AR: %s] [FR: %s]",
hor_size,vert_size,
aspect_ratio_types[aspect_ratio],
framerates_types[frame_rate]);
// No newline, force the output of progressive info in picture
// info part.
current_progressive_sequence = 2;
current_hor_size=hor_size;
current_vert_size=vert_size;
current_aspect_ratio=aspect_ratio;
current_frame_rate=frame_rate;
current_fps = framerates_values[current_frame_rate];
activity_video_info (hor_size,vert_size,
aspect_ratio_types[aspect_ratio],
framerates_types[frame_rate]);
}
else
{
dbg_print(DMT_VERBOSE, "\nInvalid sequence header:\n");
dbg_print(DMT_VERBOSE, "V: %u H: %u FR: %u AS: %u\n",
vert_size, hor_size, frame_rate, aspect_ratio);
esstream->error = 1;
return 0;
}
}
// Read complete
return 1;
}
// Return TRUE if the data parsing finished, FALSE otherwise.
// estream->pos is advanced. Data is only processed if esstream->error
// is FALSE, parsing can set esstream->error to TRUE.
static int sequence_header(struct lib_cc_decode *ctx, struct bitstream *esstream)
{
debug("Sequence header\n");
if (esstream->error || esstream->bitsleft <= 0)
return 0;
// We only get here after seeing that start code
if (read_u32(esstream) != 0xB3010000) // LSB first (0x000001B3)
fatal(CCX_COMMON_EXIT_BUG_BUG, "sequence_header: read_u32(esstream) != 0xB3010000. Please file a bug report in GitHub.\n");
unsigned hor_size = (unsigned) read_bits(esstream,12);
unsigned vert_size = (unsigned) read_bits(esstream,12);
unsigned aspect_ratio = (unsigned) read_bits(esstream,4);
unsigned frame_rate = (unsigned) read_bits(esstream,4);
#if 0
ctx->freport.width = hor_size;
ctx->freport.height = vert_size;
ctx->freport.aspect_ratio = aspect_ratio;
ctx->freport.frame_rate = frame_rate;
#endif
// Discard some information
read_bits(esstream, 18+1+10+1);
// load_intra_quantiser_matrix
if (read_bits(esstream,1))
skip_bits(esstream, 8*64);
// load_non_intra_quantiser_matrix
if (read_bits(esstream,1))
skip_bits(esstream, 8*64);
if (esstream->bitsleft < 0)
return 0;
// If we got the whole sequence, process
if (hor_size!= ctx->current_hor_size ||
vert_size!= ctx->current_vert_size ||
aspect_ratio!=ctx->current_aspect_ratio ||
frame_rate!= ctx->current_frame_rate)
{
// If horizontal/vertical size, framerate and/or aspect
// ratio are ilegal, we discard the
// whole sequence info.
if (vert_size >= 288 && vert_size <= 1088 &&
hor_size >= 352 && hor_size <= 1920 &&
(hor_size*100) / vert_size >= (352*100)/576 && // The weird *100 is to avoid using floats
hor_size / vert_size <= 2 &&
frame_rate>0 && frame_rate<9 &&
aspect_ratio>0 && aspect_ratio<5)
{
mprint ("\n\nNew video information found");
mprint ("\n");
mprint ("[%u * %u] [AR: %s] [FR: %s]",
hor_size,vert_size,
aspect_ratio_types[aspect_ratio],
framerates_types[frame_rate]);
// No newline, force the output of progressive info in picture
// info part.
ctx->current_progressive_sequence = 2;
ctx->current_hor_size = hor_size;
ctx->current_vert_size = vert_size;
ctx->current_aspect_ratio = aspect_ratio;
ctx->current_frame_rate=frame_rate;
current_fps = framerates_values[ctx->current_frame_rate];
activity_video_info (hor_size,vert_size,
aspect_ratio_types[aspect_ratio],
framerates_types[frame_rate]);
}
else
{
debug("\nInvalid sequence header:\n");
debug("V: %u H: %u FR: %u AS: %u\n",
vert_size, hor_size, frame_rate, aspect_ratio);
esstream->error = 1;
return 0;
}
}
// Read complete
return 1;
}
