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twinvq: set block align for codecs and use it in size checks

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This both allows factoring out size check for both MetaSound and TwinVQ-VQF
decoders and fixes the situation when there are several MetaSound frames
stuffed together (that happens in 8kHz @ 8kbps MetaSound in ASF for example).
This commit is contained in:
Kostya Shishkov 2013-08-24 15:00:08 +02:00
parent b89e8759e0
commit 9e7b62f0fb
3 changed files with 13 additions and 13 deletions
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9
libavcodec/metasound.c
View File

@ -170,12 +170,6 @@ static int metasound_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
GetBitContext gb;
int i, j, k;
if (buf_size * 8 < avctx->bit_rate * mtab->size / avctx->sample_rate) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
return AVERROR(EINVAL);
}
init_get_bits(&gb, buf, buf_size * 8);
bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS);
@ -323,6 +317,9 @@ static av_cold int metasound_decode_init(AVCodecContext *avctx)
return AVERROR(ENOSYS);
}
avctx->block_align = (avctx->bit_rate * tctx->mtab->size
/ avctx->sample_rate + 7) / 8;
tctx->codec = TWINVQ_CODEC_METASOUND;
tctx->read_bitstream = metasound_read_bitstream;
tctx->dec_bark_env = dec_bark_env;

8
libavcodec/twinvq.c
View File

@ -491,6 +491,12 @@ int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data,
out = (float **)frame->extended_data;
}
if (buf_size < avctx->block_align) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
return AVERROR(EINVAL);
}
if ((ret = tctx->read_bitstream(avctx, tctx, buf, buf_size)) < 0)
return ret;
@ -508,7 +514,7 @@ int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data,
*got_frame_ptr = 1;
return buf_size;
return avctx->block_align;
}
/**

9
libavcodec/twinvqdec.c
View File

@ -258,12 +258,6 @@ static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
GetBitContext gb;
int i, j, k;
if (buf_size * 8 < avctx->bit_rate * mtab->size / avctx->sample_rate + 8) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
return AVERROR(EINVAL);
}
init_get_bits(&gb, buf, buf_size * 8);
skip_bits(&gb, get_bits(&gb, 8));
@ -398,6 +392,9 @@ static av_cold int twinvq_decode_init(AVCodecContext *avctx)
return -1;
}
avctx->block_align = (avctx->bit_rate * tctx->mtab->size
/ avctx->sample_rate + 15) / 8;
tctx->codec = TWINVQ_CODEC_VQF;
tctx->read_bitstream = twinvq_read_bitstream;
tctx->dec_bark_env = dec_bark_env;