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g726: pre-calculate the number of output samples.

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Allows for checking output buffer size and simplification of decoding loop.
This commit is contained in:
Justin Ruggles 2011-10-27 14:36:41 -04:00
parent e61a670b53
commit c8d36d254e
1 changed files with 11 additions and 3 deletions
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14
libavcodec/g726.c
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@ -377,16 +377,24 @@ static int g726_decode_frame(AVCodecContext *avctx,
G726Context *c = avctx->priv_data; G726Context *c = avctx->priv_data;
int16_t *samples = data; int16_t *samples = data;
GetBitContext gb; GetBitContext gb;
int out_samples, out_size;
out_samples = buf_size * 8 / c->code_size;
out_size = out_samples * av_get_bytes_per_sample(avctx->sample_fmt);
if (*data_size < out_size) {
av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
return AVERROR(EINVAL);
}
init_get_bits(&gb, buf, buf_size * 8); init_get_bits(&gb, buf, buf_size * 8);
while (get_bits_count(&gb) + c->code_size <= buf_size*8) while (out_samples--)
*samples++ = g726_decode(c, get_bits(&gb, c->code_size)); *samples++ = g726_decode(c, get_bits(&gb, c->code_size));
if(buf_size*8 != get_bits_count(&gb)) if (get_bits_left(&gb) > 0)
av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n"); av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n");
*data_size = (uint8_t*)samples - (uint8_t*)data; *data_size = out_size;
return buf_size; return buf_size;
} }