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Validate the number of audio channels before using it in wmapro decoder.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Laurent Aimar 2011-09-26 23:37:29 +02:00 committed by Michael Niedermayer
parent eb11cca530
commit fc64434030
1 changed files with 12 additions and 12 deletions
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24
libavcodec/wmaprodec.c
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@ -309,10 +309,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
3, s->decode_flags);
/** init previous block len */
for (i = 0; i < avctx->channels; i++)
s->channel[i].prev_block_len = s->samples_per_frame;
/** subframe info */
log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
s->max_num_subframes = 1 << log2_max_num_subframes;
@ -332,6 +328,18 @@ static av_cold int decode_init(AVCodecContext *avctx)
s->num_channels = avctx->channels;
if (s->num_channels < 0) {
av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
return AVERROR_INVALIDDATA;
} else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
av_log_ask_for_sample(avctx, "unsupported number of channels\n");
return AVERROR_PATCHWELCOME;
}
/** init previous block len */
for (i = 0; i < s->num_channels; i++)
s->channel[i].prev_block_len = s->samples_per_frame;
/** extract lfe channel position */
s->lfe_channel = -1;
@ -343,14 +351,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
}
}
if (s->num_channels < 0) {
av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
return AVERROR_INVALIDDATA;
} else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
av_log_ask_for_sample(avctx, "unsupported number of channels\n");
return AVERROR_PATCHWELCOME;
}
INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
scale_huffbits, 1, 1,
scale_huffcodes, 2, 2, 616);