On Tue, Dec 13, 2011 at 02:18:19AM +0530, Aneesh Dogra wrote:
> ---
> libavcodec/vc1dec.c | 19 +++++++++----------
> 1 files changed, 9 insertions(+), 10 deletions(-)
>
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index 0340dc2..35596ad 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -5425,7 +5425,6 @@ static int vc1_decode_frame(AVCodecContext *avctx, void
> *data,
> MpegEncContext *s = &v->s;
> AVFrame *pict = data;
> uint8_t *buf2 = NULL;
> - uint8_t *buf_field2 = NULL;
> const uint8_t *buf_start = buf;
> int mb_height, n_slices1;
> struct {
> @@ -5492,9 +5491,6 @@ static int vc1_decode_frame(AVCodecContext *avctx, void
> *data,
> slices[n_slices].mby_start = s->mb_height >> 1;
> n_slices1 = n_slices - 1; // index of the last slice of
> the first field
> n_slices++;
> - // not necessary, ad hoc until I find a way to handle
> WVC1i
> - buf_field2 = av_mallocz(buf_size +
> FF_INPUT_BUFFER_PADDING_SIZE);
> - vc1_unescape_buffer(start + 4, size, buf_field2);
> break;
> }
> case VC1_CODE_ENTRYPOINT: /* it should be before frame data
> */
> @@ -5522,14 +5518,21 @@ static int vc1_decode_frame(AVCodecContext *avctx,
> void *data,
> }
> } else if (v->interlace && ((buf[0] & 0xC0) == 0xC0)) { /* WVC1
> interlaced stores both fields divided by marker */
> const uint8_t *divider;
> + int buf_size3;
>
> divider = find_next_marker(buf, buf + buf_size);
> if ((divider == (buf + buf_size)) || AV_RB32(divider) !=
> VC1_CODE_FIELD) {
> av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced
> frame\n");
> goto err;
> } else { // found field marker, unescape second field
> - buf_field2 = av_mallocz(buf_size +
> FF_INPUT_BUFFER_PADDING_SIZE);
> - vc1_unescape_buffer(divider + 4, buf + buf_size - divider -
> 4, buf_field2);
> + slices = av_realloc(slices, sizeof(*slices) * (n_slices+1));
this still needs a check for realloc failure
something like
uint8_t *tmp;
...
tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));
if (!tmp)
goto err;
slices = tmp;
> + slices[n_slices].buf = av_mallocz(buf_size +
> FF_INPUT_BUFFER_PADDING_SIZE);
and this one - for alloc failure, like
if (!slices[n_slices].buf)
goto err;
> + buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size
> - divider - 4, slices[n_slices].buf);
> + init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,
> + buf_size3 << 3);
> + slices[n_slices].mby_start = s->mb_height >> 1;
> + n_slices1 = n_slices - 1;
> + n_slices++;
> }
> buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);
> } else {
> @@ -5700,10 +5703,7 @@ static int vc1_decode_frame(AVCodecContext *avctx,
> void *data,
> s->gb = slices[i].gb;
> }
> if (v->field_mode) {
> - av_free(buf_field2);
> v->second_field = 0;
> - }
> - if (v->field_mode) {
> if (s->pict_type == AV_PICTURE_TYPE_B) {
> memcpy(v->mv_f_base, v->mv_f_next_base,
> 2 * (s->b8_stride * (s->mb_height * 2 + 1) +
> s->mb_stride * (s->mb_height + 1) * 2));
> @@ -5758,7 +5758,6 @@ err:
> for (i = 0; i < n_slices; i++)
> av_free(slices[i].buf);
> av_free(slices);
> - av_free(buf_field2);
> return -1;
> }
>
> --
> 1.7.4.1
>
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