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avformat/dtshddec: implement AUPR_HDR chunk parsing 

Use it to get stream duration, sample rate, channel count and initial padding

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2016-05-16 15:45:22 -03:00
parent ab3c04c458
commit 60c2e38dcb
1 changed files with 23 additions and 1 deletions
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24
libavformat/dtshddec.c
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@ -21,7 +21,9 @@
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavcodec/dca.h"
#include "avformat.h"
#include "internal.h"
#define AUPR_HDR 0x415550522D484452
#define AUPRINFO 0x41555052494E464F
@ -54,6 +56,7 @@ static int dtshd_read_header(AVFormatContext *s)
DTSHDDemuxContext *dtshd = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t chunk_type, chunk_size;
int64_t duration;
AVStream *st;
int ret;
char *value;
@ -88,9 +91,24 @@ static int dtshd_read_header(AVFormatContext *s)
if (dtshd->data_end <= chunk_size)
return AVERROR_INVALIDDATA;
if (!pb->seekable)
return 0;
goto break_loop;
goto skip;
break;
case AUPR_HDR:
if (chunk_size < 21)
return AVERROR_INVALIDDATA;
avio_skip(pb, 3);
st->codecpar->sample_rate = avio_rb24(pb);
if (!st->codecpar->sample_rate)
return AVERROR_INVALIDDATA;
duration = avio_rb32(pb); // num_frames
duration *= avio_rb16(pb); // samples_per_frames
st->duration = duration;
avio_skip(pb, 5);
st->codecpar->channels = ff_dca_count_chs_for_mask(avio_rb16(pb));
st->codecpar->initial_padding = avio_rb16(pb);
avio_skip(pb, chunk_size - 21);
break;
case FILEINFO:
if (chunk_size > INT_MAX)
goto skip;
@ -115,6 +133,10 @@ skip:
avio_seek(pb, dtshd->data_start, SEEK_SET);
break_loop:
if (st->codecpar->sample_rate)
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}