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anim_encode: Fix encoded_frames_[] overflow

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Check encoded_frames_ count and call FlushFrames if necessary after
IncreasePreviousDuration. Avoids an overflow in encoded_frames_[] with
-kmax 0 and an assertion failure related to the previous and keyframe
durations when a frame is forced in this way.

Based on patch by tomwei7g <at> gmail

Bug: webp:518
Change-Id: Idef685e6c06a67d48fcdc048265ca0e672a01263
This commit is contained in:
James Zern 2021-06-22 23:07:04 +00:00
parent 6f445b3e3d
commit 116d235c30
1 changed files with 8 additions and 1 deletions
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9
src/mux/anim_encode.c
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@ -946,7 +946,8 @@ static int IncreasePreviousDuration(WebPAnimEncoder* const enc, int duration) {
int new_duration;
assert(enc->count_ >= 1);
assert(prev_enc_frame->sub_frame_.duration ==
assert(!prev_enc_frame->is_key_frame_ ||
prev_enc_frame->sub_frame_.duration ==
prev_enc_frame->key_frame_.duration);
assert(prev_enc_frame->sub_frame_.duration ==
(prev_enc_frame->sub_frame_.duration & (MAX_DURATION - 1)));
@ -1355,6 +1356,12 @@ int WebPAnimEncoderAdd(WebPAnimEncoder* enc, WebPPicture* frame, int timestamp,
if (!IncreasePreviousDuration(enc, (int)prev_frame_duration)) {
return 0;
}
// IncreasePreviousDuration() may add a frame to avoid exceeding
// MAX_DURATION which could cause CacheFrame() to over read encoded_frames_
// before the next flush.
if (enc->count_ == enc->size_ && !FlushFrames(enc)) {
return 0;
}
} else {
enc->first_timestamp_ = timestamp;
}