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avformat/flacdec: set time base for headerless flac

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Fixes #6396.
This commit is contained in:
Paul B Mahol 2023-09-06 02:04:10 +02:00
parent e6923e06c2
commit 5f8c113b75
1 changed files with 10 additions and 1 deletions
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11
libavformat/flacdec.c
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@ -46,11 +46,16 @@ static void reset_index_position(int64_t metadata_head_size, AVStream *st)
sti->index_entries[i].pos += metadata_head_size; sti->index_entries[i].pos += metadata_head_size;
} }
static const uint16_t sr_table[16] = {
0, 1764, 3528, 3840, 160, 320, 441, 480, 640, 882, 960, 1920, 0, 0, 0, 0
};
static int flac_read_header(AVFormatContext *s) static int flac_read_header(AVFormatContext *s)
{ {
int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0; int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
uint8_t header[4]; uint8_t header[4];
uint8_t *buffer=NULL; uint8_t *buffer=NULL;
uint32_t marker;
FLACDecContext *flac = s->priv_data; FLACDecContext *flac = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL); AVStream *st = avformat_new_stream(s, NULL);
if (!st) if (!st)
@ -61,7 +66,11 @@ static int flac_read_header(AVFormatContext *s)
/* the parameters will be extracted from the compressed bitstream */ /* the parameters will be extracted from the compressed bitstream */
/* if fLaC marker is not found, assume there is no header */ /* if fLaC marker is not found, assume there is no header */
if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) { marker = avio_rl32(s->pb);
if (marker != MKTAG('f','L','a','C')) {
const int sample_rate = 50 * sr_table[(marker >> 16) & 0xF];
if (sample_rate)
avpriv_set_pts_info(st, 64, 1, sample_rate);
avio_seek(s->pb, -4, SEEK_CUR); avio_seek(s->pb, -4, SEEK_CUR);
return 0; return 0;
} }