eessppeelllloo/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-12-13 02:20:07 +01:00
Code Issues Packages Projects Releases Wiki Activity

avformat/mp3dec: avoid early EOF with concatenated gapless mp3s

Browse Source 
Consider a file created with something like:

    cat file1.mp3 file2.mp3 > result.mp3

Then if file2.mp3 has gapless information, result.mp3 would stop playing
something in the middle. This happens because the gapless info directs
the decoder to discard all samples after a certain position. To make
matters worse, the gapless info of file2.mp3 will be used when playing
the file1.mp3 part, because the gapless info is located at the end of
the file.

While handling concatenated gapless files correctly would be insane and
a lot of effort (especially without scanning the whole file on opening),
it's easy to prevent at least early EOF. Playback will happen to work,
even if it's slightly broken.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
wm4
2014-09-21 12:51:41 +02:00
committed by Michael Niedermayer
parent 36bf549b27
commit 6c7f1155bb
3 changed files with 16 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
libavformat/utils.c
View File

@@ -1358,13 +1358,14 @@ static int read_frame_internal(AVFormatContext *s, AVPacket *pkt)
if (ret >= 0) {
AVStream *st = s->streams[pkt->stream_index];
int discard_padding = 0;
if (st->end_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
if (st->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
int64_t sample = ts_to_samples(st, pts);
int duration = ts_to_samples(st, pkt->duration);
int64_t end_sample = sample + duration;
if (duration > 0 && end_sample >= st->end_discard_sample)
discard_padding = FFMIN(end_sample - st->end_discard_sample, duration);
if (duration > 0 && end_sample >= st->first_discard_sample &&
sample < st->last_discard_sample)
discard_padding = FFMIN(end_sample - st->first_discard_sample, duration);
}
if (st->skip_samples || discard_padding) {
uint8_t *p = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);