From dea5517ee383b4133a11137b99b27ba389e04a47 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Wed, 6 Sep 2023 02:04:10 +0200 Subject: [PATCH] avformat/flacdec: set time base for headerless flac Fixes #6396. Signed-off-by: Paul B Mahol --- libavformat/flacdec.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c index b58ec03963..5104f23110 100644 --- a/libavformat/flacdec.c +++ b/libavformat/flacdec.c @@ -46,11 +46,16 @@ static void reset_index_position(int64_t metadata_head_size, AVStream *st) 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) { int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0; uint8_t header[4]; uint8_t *buffer=NULL; + uint32_t marker; FLACDecContext *flac = s->priv_data; AVStream *st = avformat_new_stream(s, NULL); if (!st) @@ -61,7 +66,11 @@ static int flac_read_header(AVFormatContext *s) /* the parameters will be extracted from the compressed bitstream */ /* 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); return 0; } -- 2.39.1