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wmadec: consolidate 2 output buffer size checks into 1 check

This commit is contained in:
Justin Ruggles 2011-09-23 23:38:36 -04:00
parent 9a33264478
commit d0b1b1c5c7
1 changed files with 14 additions and 11 deletions
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25
libavcodec/wmadec.c
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@ -804,7 +804,7 @@ static int wma_decode_superframe(AVCodecContext *avctx,
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
WMACodecContext *s = avctx->priv_data;
int nb_frames, bit_offset, i, pos, len;
int nb_frames, bit_offset, i, pos, len, out_size;
uint8_t *q;
int16_t *samples;
@ -825,13 +825,19 @@ static int wma_decode_superframe(AVCodecContext *avctx,
if (s->use_bit_reservoir) {
/* read super frame header */
skip_bits(&s->gb, 4); /* super frame index */
nb_frames = get_bits(&s->gb, 4) - 1;
nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
} else {
nb_frames = 1;
}
if((nb_frames+1) * s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){
av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n");
goto fail;
}
out_size = nb_frames * s->frame_len * s->nb_channels *
av_get_bytes_per_sample(avctx->sample_fmt);
if (*data_size < out_size) {
av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n");
goto fail;
}
if (s->use_bit_reservoir) {
bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
if (s->last_superframe_len > 0) {
@ -860,6 +866,7 @@ static int wma_decode_superframe(AVCodecContext *avctx,
if (wma_decode_frame(s, samples) < 0)
goto fail;
samples += s->nb_channels * s->frame_len;
nb_frames--;
}
/* read each frame starting from bit_offset */
@ -888,10 +895,6 @@ static int wma_decode_superframe(AVCodecContext *avctx,
s->last_superframe_len = len;
memcpy(s->last_superframe, buf + pos, len);
} else {
if(s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){
av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n");
goto fail;
}
/* single frame decode */
if (wma_decode_frame(s, samples) < 0)
goto fail;
@ -900,7 +903,7 @@ static int wma_decode_superframe(AVCodecContext *avctx,
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d outbytes:%d eaten:%d\n", s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len, (int8_t *)samples - (int8_t *)data, s->block_align);
*data_size = (int8_t *)samples - (int8_t *)data;
*data_size = out_size;
return s->block_align;
fail:
/* when error, we reset the bit reservoir */