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riffenc: do not fall back on AVCodecContext.frame_size for MP3

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It will not be set unless the codec context is used as the encoding
context, which is discouraged. For MP2, av_get_audio_frame_duration()
will already set the frame size properly. For MP3, set the frame size
explicitly.
This commit is contained in:
Anton Khirnov 2014-08-24 10:28:32 +00:00
parent 91e8d2eb1f
commit 56dc46a189
1 changed files with 3 additions and 7 deletions
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10
libavformat/riffenc.c
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@ -63,8 +63,6 @@ int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
* fall back on using AVCodecContext.frame_size, which is not as reliable
* for indicating packet duration. */
frame_size = av_get_audio_frame_duration(enc, enc->block_align);
if (!frame_size)
frame_size = enc->frame_size;
waveformatextensible = (enc->channels > 2 && enc->channel_layout) ||
enc->sample_rate > 48000 ||
@ -96,12 +94,10 @@ int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
enc->bits_per_coded_sample, bps);
}
if (enc->codec_id == AV_CODEC_ID_MP2 ||
enc->codec_id == AV_CODEC_ID_MP3) {
/* This is wrong, but it seems many demuxers do not work if this
* is set correctly. */
if (enc->codec_id == AV_CODEC_ID_MP2) {
blkalign = frame_size;
// blkalign = 144 * enc->bit_rate/enc->sample_rate;
} else if (enc->codec_id == AV_CODEC_ID_MP3) {
blkalign = 576 * (enc->sample_rate <= 24000 ? 1 : 2);
} else if (enc->codec_id == AV_CODEC_ID_AC3) {
blkalign = 3840; /* maximum bytes per frame */
} else if (enc->block_align != 0) { /* specified by the codec */