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Make WNV1 decoder use temporary buffer for bit-reversed input

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Originally committed as revision 16920 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2009-02-01 16:11:33 +00:00
parent 94f694a476
commit b709397530
1 changed files with 12 additions and 3 deletions
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15
libavcodec/wnv1.c
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@ -58,13 +58,20 @@ static inline int wnv1_get_code(WNV1Context *w, int base_value)
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
const uint8_t *buf, int buf_size)
{
WNV1Context * const l = avctx->priv_data;
AVFrame * const p= (AVFrame*)&l->pic;
unsigned char *Y,*U,*V;
int i, j;
int prev_y = 0, prev_u = 0, prev_v = 0;
uint8_t *rbuf;
rbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
if(!rbuf){
av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
return -1;
}
if(p->data[0])
avctx->release_buffer(avctx, p);
@ -72,13 +79,14 @@ static int decode_frame(AVCodecContext *avctx,
p->reference = 0;
if(avctx->get_buffer(avctx, p) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
av_free(rbuf);
return -1;
}
p->key_frame = 1;
for(i=8; i<buf_size; i++)
buf[i]= ff_reverse[ buf[i] ]; //FIXME ensure that the buffer is modifyable or use a temp one
init_get_bits(&l->gb, buf+8, (buf_size-8)*8);
rbuf[i]= ff_reverse[ buf[i] ];
init_get_bits(&l->gb, rbuf+8, (buf_size-8)*8);
if (buf[2] >> 4 == 6)
l->shift = 2;
@ -112,6 +120,7 @@ static int decode_frame(AVCodecContext *avctx,
*data_size = sizeof(AVFrame);
*(AVFrame*)data = l->pic;
av_free(rbuf);
return buf_size;
}