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lavf: prevent infinite loops while flushing in avformat_find_stream_info

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If no data was seen for a stream decoder are returning 0 when fed with
empty packets for flushing. We can stop flushing when the decoder does
not return delayed delayed frames anymore. Changes try_decode_frame()
return value to got_picture or negative error.

CC: libav-stable@libav.org
This commit is contained in:
Janne Grunau 2012-01-18 10:59:32 +01:00
parent d2ee8c1779
commit b3461c29c1
1 changed files with 13 additions and 7 deletions
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20
libavformat/utils.c
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@ -2130,6 +2130,7 @@ static int has_decode_delay_been_guessed(AVStream *st)
st->info->nb_decoded_frames >= 6;
}
/* returns 1 or 0 if or if not decoded data was returned, or a negative error */
static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **options)
{
AVCodec *codec;
@ -2177,6 +2178,7 @@ static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **option
st->info->nb_decoded_frames++;
pkt.data += ret;
pkt.size -= ret;
ret = got_picture;
}
}
return ret;
@ -2401,16 +2403,20 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
st = ic->streams[i];
/* flush the decoders */
while ((err = try_decode_frame(st, &empty_pkt,
(options && i < orig_nb_streams) ?
&options[i] : NULL)) >= 0)
if (has_codec_parameters(st->codec))
break;
do {
err = try_decode_frame(st, &empty_pkt,
(options && i < orig_nb_streams) ?
&options[i] : NULL);
} while (err > 0 && !has_codec_parameters(st->codec));
if (!has_codec_parameters(st->codec)){
if (err < 0) {
av_log(ic, AV_LOG_WARNING,
"decoding for stream %d failed\n", st->index);
} else if (!has_codec_parameters(st->codec)){
char buf[256];
avcodec_string(buf, sizeof(buf), st->codec, 0);
av_log(ic, AV_LOG_WARNING, "Could not find codec parameters (%s)\n", buf);
av_log(ic, AV_LOG_WARNING,
"Could not find codec parameters (%s)\n", buf);
} else {
ret = 0;
}