dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-10-31 10:25:46 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

demux: remove GetFragment()

Browse Source 
Change-Id: Ibea117b64ca91ccafde80411c10e0035dc3247f3
This commit is contained in:
James Zern
2015-12-15 18:53:01 -08:00
parent d3cfb79ad6
commit 47399f92b0
1 changed files with 16 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

54
src/demux/demux.c
View File

@@ -47,7 +47,7 @@ typedef struct Frame {
int duration_;
WebPMuxAnimDispose dispose_method_;
WebPMuxAnimBlend blend_method_;
int frame_num_; // the referent frame number for use in assembling fragments.
int frame_num_;
int complete_; // img_components_ contains a full image.
ChunkData img_components_[2]; // 0=VP8{,L} 1=ALPH
struct Frame* next_;
@@ -737,8 +737,6 @@ uint32_t WebPDemuxGetI(const WebPDemuxer* dmux, WebPFormatFeature feature) {
// -----------------------------------------------------------------------------
// Frame iteration
// Find the first 'frame_num' frame. There may be multiple such frames in a
// fragmented frame.
static const Frame* GetFrame(const WebPDemuxer* const dmux, int frame_num) {
const Frame* f;
for (f = dmux->frames_; f != NULL; f = f->next_) {
@@ -747,22 +745,6 @@ static const Frame* GetFrame(const WebPDemuxer* const dmux, int frame_num) {
return f;
}
// Returns fragment 'fragment_num' and the total count.
// TODO(jzern): this function is no longer necessary.
static const Frame* GetFragment(
const Frame* const frame_set, int fragment_num, int* const count) {
const int this_frame = frame_set->frame_num_;
const Frame* f = frame_set;
const Frame* fragment = NULL;
int total;
for (total = 0; f != NULL && f->frame_num_ == this_frame; f = f->next_) {
if (++total == fragment_num) fragment = f;
}
*count = total;
return fragment;
}
static const uint8_t* GetFramePayload(const uint8_t* const mem_buf,
const Frame* const frame,
size_t* const data_size) {
@@ -789,29 +771,25 @@ static const uint8_t* GetFramePayload(const uint8_t* const mem_buf,
// Create a whole 'frame' from VP8 (+ alpha) or lossless.
static int SynthesizeFrame(const WebPDemuxer* const dmux,
const Frame* const first_frame,
int fragment_num, WebPIterator* const iter) {
const Frame* const frame,
WebPIterator* const iter) {
const uint8_t* const mem_buf = dmux->mem_.buf_;
int num_fragments;
size_t payload_size = 0;
const Frame* const fragment =
GetFragment(first_frame, fragment_num, &num_fragments);
const uint8_t* const payload =
GetFramePayload(mem_buf, fragment, &payload_size);
const uint8_t* const payload = GetFramePayload(mem_buf, frame, &payload_size);
if (payload == NULL) return 0;
assert(first_frame != NULL);
assert(frame != NULL);
iter->frame_num = first_frame->frame_num_;
iter->frame_num = frame->frame_num_;
iter->num_frames = dmux->num_frames_;
iter->x_offset = fragment->x_offset_;
iter->y_offset = fragment->y_offset_;
iter->width = fragment->width_;
iter->height = fragment->height_;
iter->has_alpha = fragment->has_alpha_;
iter->duration = fragment->duration_;
iter->dispose_method = fragment->dispose_method_;
iter->blend_method = fragment->blend_method_;
iter->complete = fragment->complete_;
iter->x_offset = frame->x_offset_;
iter->y_offset = frame->y_offset_;
iter->width = frame->width_;
iter->height = frame->height_;
iter->has_alpha = frame->has_alpha_;
iter->duration = frame->duration_;
iter->dispose_method = frame->dispose_method_;
iter->blend_method = frame->blend_method_;
iter->complete = frame->complete_;
iter->fragment.bytes = payload;
iter->fragment.size = payload_size;
return 1;
@@ -827,7 +805,7 @@ static int SetFrame(int frame_num, WebPIterator* const iter) {
frame = GetFrame(dmux, frame_num);
if (frame == NULL) return 0;
return SynthesizeFrame(dmux, frame, 1, iter);
return SynthesizeFrame(dmux, frame, iter);
}
int WebPDemuxGetFrame(const WebPDemuxer* dmux, int frame, WebPIterator* iter) {