mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/mobiclip: Don't check for errors for complete VLCs
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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c4229ad074
commit
10106b5d54
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@ -459,7 +459,7 @@ static void idct(int *arr, int size)
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arr[7] = tmp[0] - x0;
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}
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static int read_run_encoding(AVCodecContext *avctx,
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static void read_run_encoding(AVCodecContext *avctx,
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int *last, int *run, int *level)
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{
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MobiClipContext *s = avctx->priv_data;
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@ -467,14 +467,9 @@ static int read_run_encoding(AVCodecContext *avctx,
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int n = get_vlc2(gb, s->vlc[s->dct_tab_idx].table,
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s->vlc[s->dct_tab_idx].bits, 2);
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if (n < 0)
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return AVERROR_INVALIDDATA;
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*last = (n >> 11) == 1;
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*run = (n >> 5) & 0x3F;
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*level = n & 0x1F;
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return 0;
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}
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static int add_coefficients(AVCodecContext *avctx, AVFrame *frame,
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@ -486,29 +481,22 @@ static int add_coefficients(AVCodecContext *avctx, AVFrame *frame,
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const uint8_t *ztab = size == 8 ? ff_zigzag_direct : zigzag4x4_tab;
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const int *qtab = s->qtab[size == 8];
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uint8_t *dst = frame->data[plane] + by * frame->linesize[plane] + bx;
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int ret = 0;
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for (int pos = 0; get_bits_left(gb) > 0; pos++) {
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int qval, last, run, level;
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ret = read_run_encoding(avctx, &last, &run, &level);
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if (ret < 0)
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return ret;
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read_run_encoding(avctx, &last, &run, &level);
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if (level) {
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if (get_bits1(gb))
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level = -level;
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} else if (!get_bits1(gb)) {
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ret = read_run_encoding(avctx, &last, &run, &level);
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if (ret < 0)
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return ret;
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read_run_encoding(avctx, &last, &run, &level);
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level += run_residue[s->dct_tab_idx][(last ? 64 : 0) + run];
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if (get_bits1(gb))
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level = -level;
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} else if (!get_bits1(gb)) {
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ret = read_run_encoding(avctx, &last, &run, &level);
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if (ret < 0)
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return ret;
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read_run_encoding(avctx, &last, &run, &level);
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run += run_residue[s->dct_tab_idx][128 + (last ? 64 : 0) + level];
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if (get_bits1(gb))
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level = -level;
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@ -547,7 +535,7 @@ static int add_coefficients(AVCodecContext *avctx, AVFrame *frame,
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dst += frame->linesize[plane];
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}
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return ret;
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return 0;
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}
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static int add_pframe_coefficients(AVCodecContext *avctx, AVFrame *frame,
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@ -1262,8 +1250,6 @@ static int predict_motion(AVCodecContext *avctx,
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idx2 = get_vlc2(gb, s->mv_vlc[s->moflex][tidx].table,
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MOBI_MV_VLC_BITS, 1);
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if (idx2 < 0)
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return AVERROR_INVALIDDATA;
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ret = predict_motion(avctx, width, height, idx2,
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offsetm, offsetx + i * adjx, offsety + i * adjy);
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@ -1338,8 +1324,6 @@ static int mobiclip_decode(AVCodecContext *avctx, void *data,
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idx = get_vlc2(gb, s->mv_vlc[s->moflex][0].table,
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MOBI_MV_VLC_BITS, 1);
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if (idx < 0)
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return AVERROR_INVALIDDATA;
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if (idx == 6 || idx == 7) {
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ret = decode_macroblock(avctx, frame, x, y, idx == 7);
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