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avcodec/vp3: Do not recalculate coded_fragment_list for keyframes

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This improves decoding speed of keyframes

Fixes: Timeout (102->27sec)
Fixes: 9642/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP3_fuzzer-6676767875006464

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-10-28 14:44:37 +01:00
parent f563180817
commit b5e7e437f4
1 changed files with 29 additions and 12 deletions
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41
libavcodec/vp3.c
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@ -223,6 +223,10 @@ typedef struct Vp3DecodeContext {
* which of the fragments are coded */
int *coded_fragment_list[3];
int *kf_coded_fragment_list;
int *nkf_coded_fragment_list;
int num_kf_coded_fragment[3];
VLC dc_vlc[16];
VLC ac_vlc_1[16];
VLC ac_vlc_2[16];
@ -271,7 +275,8 @@ static av_cold void free_tables(AVCodecContext *avctx)
av_freep(&s->superblock_coding);
av_freep(&s->all_fragments);
av_freep(&s->coded_fragment_list[0]);
av_freep(&s->nkf_coded_fragment_list);
av_freep(&s->kf_coded_fragment_list);
av_freep(&s->dct_tokens_base);
av_freep(&s->superblock_fragments);
av_freep(&s->macroblock_coding);
@ -538,6 +543,9 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
s->total_num_coded_frags = 0;
memset(s->macroblock_coding, MODE_COPY, s->macroblock_count);
s->coded_fragment_list[0] = s->keyframe ? s->kf_coded_fragment_list
: s->nkf_coded_fragment_list;
for (plane = 0; plane < 3; plane++) {
int sb_start = superblock_starts[plane];
int sb_end = sb_start + (plane ? s->c_superblock_count
@ -545,17 +553,21 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
int num_coded_frags = 0;
if (s->keyframe) {
for (i = sb_start; i < sb_end; i++) {
/* iterate through all 16 fragments in a superblock */
for (j = 0; j < 16; j++) {
/* if the fragment is in bounds, check its coding status */
current_fragment = s->superblock_fragments[i * 16 + j];
if (current_fragment != -1) {
s->coded_fragment_list[plane][num_coded_frags++] =
current_fragment;
if (s->num_kf_coded_fragment[plane] == -1) {
for (i = sb_start; i < sb_end; i++) {
/* iterate through all 16 fragments in a superblock */
for (j = 0; j < 16; j++) {
/* if the fragment is in bounds, check its coding status */
current_fragment = s->superblock_fragments[i * 16 + j];
if (current_fragment != -1) {
s->coded_fragment_list[plane][num_coded_frags++] =
current_fragment;
}
}
}
}
s->num_kf_coded_fragment[plane] = num_coded_frags;
} else
num_coded_frags = s->num_kf_coded_fragment[plane];
} else {
for (i = sb_start; i < sb_end && get_bits_left(gb) > 0; i++) {
if (get_bits_left(gb) < plane0_num_coded_frags >> 2) {
@ -1705,7 +1717,9 @@ static av_cold int allocate_tables(AVCodecContext *avctx)
s->superblock_coding = av_mallocz(s->superblock_count);
s->all_fragments = av_mallocz_array(s->fragment_count, sizeof(Vp3Fragment));
s->coded_fragment_list[0] = av_mallocz_array(s->fragment_count, sizeof(int));
s-> kf_coded_fragment_list = av_mallocz_array(s->fragment_count, sizeof(int));
s->nkf_coded_fragment_list = av_mallocz_array(s->fragment_count, sizeof(int));
memset(s-> num_kf_coded_fragment, -1, sizeof(s-> num_kf_coded_fragment));
s->dct_tokens_base = av_mallocz_array(s->fragment_count,
64 * sizeof(*s->dct_tokens_base));
@ -1717,7 +1731,8 @@ static av_cold int allocate_tables(AVCodecContext *avctx)
s->macroblock_coding = av_mallocz(s->macroblock_count + 1);
if (!s->superblock_coding || !s->all_fragments ||
!s->dct_tokens_base || !s->coded_fragment_list[0] ||
!s->dct_tokens_base || !s->kf_coded_fragment_list ||
!s->nkf_coded_fragment_list ||
!s->superblock_fragments || !s->macroblock_coding ||
!s->motion_val[0] || !s->motion_val[1]) {
vp3_decode_end(avctx);
@ -2271,6 +2286,8 @@ static int vp3_init_thread_copy(AVCodecContext *avctx)
s->superblock_coding = NULL;
s->all_fragments = NULL;
s->coded_fragment_list[0] = NULL;
s-> kf_coded_fragment_list= NULL;
s->nkf_coded_fragment_list= NULL;
s->dct_tokens_base = NULL;
s->superblock_fragments = NULL;
s->macroblock_coding = NULL;