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add waveformatextensible support

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Originally committed as revision 7714 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2007-01-25 21:56:06 +00:00
parent cc1fb6238b
commit 72fd40bd3a
1 changed files with 19 additions and 11 deletions
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30
libavformat/riff.c
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@ -422,22 +422,30 @@ void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
codec->bits_per_sample = 8;
}else
codec->bits_per_sample = get_le16(pb);
codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
codec->extradata_size = get_le16(pb);
if (codec->extradata_size > 0) {
if (codec->extradata_size > size - 18)
codec->extradata_size = size - 18;
if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
int cbSize = get_le16(pb); /* cbSize */
size -= 18;
cbSize = FFMIN(size, cbSize);
if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
codec->bits_per_sample = get_le16(pb);
get_le32(pb); /* dwChannelMask */
id = get_le32(pb); /* 4 first bytes of GUID */
url_fskip(pb, 12); /* skip end of GUID */
cbSize -= 22;
size -= 22;
}
codec->extradata_size = cbSize;
if (cbSize > 0) {
codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
get_buffer(pb, codec->extradata, codec->extradata_size);
} else
codec->extradata_size = 0;
size -= cbSize;
}
/* It is possible for the chunk to contain garbage at the end */
if (size - codec->extradata_size - 18 > 0)
url_fskip(pb, size - codec->extradata_size - 18);
if (size > 0)
url_fskip(pb, size);
}
codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
}