fc7815d692
To be enabled with the flag WEBP_USE_THREAD. For now it's only available on unix (pthread), when using Makefile.unix Will be switched on more generally later. In-loop filtering and output (=rescaling/yuv->rgb conversion) is done in parallel to bitstream decoding, lagging 1 row behind. Example: examples/dwebp bryce.webp -v Time to decode picture: 0.680s examples/dwebp bryce.webp -v -mt Time to decode picture: 0.515s Change-Id: Ic30a897423137a3bdace9c4e30465ef758fe53f2
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
// Copyright 2011 Google Inc.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// Multi-threaded worker
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//
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// Author: skal@google.com (Pascal Massimino)
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#include "./vp8i.h"
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#include "./thread.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#ifdef WEBP_USE_THREAD
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static void *WebPWorkerThreadLoop(void *ptr) { // thread loop
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WebPWorker* const worker = (WebPWorker*)ptr;
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int done = 0;
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while (!done) {
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pthread_mutex_lock(&worker->mutex_);
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while (worker->status_ == OK) { // wait in idling mode
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pthread_cond_wait(&worker->condition_, &worker->mutex_);
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}
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if (worker->status_ == WORK) {
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if (worker->hook) {
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worker->had_error |= !worker->hook(worker->data1, worker->data2);
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}
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worker->status_ = OK;
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} else if (worker->status_ == NOT_OK) { // finish the worker
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done = 1;
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}
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// signal to the main thread that we're done (for Sync())
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pthread_cond_signal(&worker->condition_);
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pthread_mutex_unlock(&worker->mutex_);
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}
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return NULL; // Thread is finished
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}
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// main thread state control
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static void WebPWorkerChangeState(WebPWorker* const worker,
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WebPWorkerStatus new_status) {
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pthread_mutex_lock(&worker->mutex_);
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assert(worker->status_ >= OK);
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// wait for the worker to finish
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while (worker->status_ != OK) {
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pthread_cond_wait(&worker->condition_, &worker->mutex_);
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}
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// assign new status and release the working thread if needed
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if (new_status != OK) {
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worker->status_ = new_status;
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pthread_cond_signal(&worker->condition_);
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}
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pthread_mutex_unlock(&worker->mutex_);
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}
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#endif
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//-----------------------------------------------------------------------------
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void WebPWorkerInit(WebPWorker* const worker) {
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memset(worker, 0, sizeof(*worker));
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worker->status_ = NOT_OK;
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}
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int WebPWorkerSync(WebPWorker* const worker) {
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#ifdef WEBP_USE_THREAD
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WebPWorkerChangeState(worker, OK);
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#endif
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assert(worker->status_ == OK);
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return !worker->had_error;
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}
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int WebPWorkerReset(WebPWorker* const worker) {
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int ok = 1;
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worker->had_error = 0;
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if (worker->status_ < OK) {
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#ifdef WEBP_USE_THREAD
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if (pthread_mutex_init(&worker->mutex_, 0) ||
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pthread_cond_init(&worker->condition_, 0)) {
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return 0;
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}
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pthread_mutex_lock(&worker->mutex_);
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ok = !pthread_create(&worker->thread_, 0, WebPWorkerThreadLoop, worker);
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if (ok) worker->status_ = OK;
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pthread_mutex_unlock(&worker->mutex_);
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#else
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worker->status_ = OK;
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#endif
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} else if (worker->status_ > OK) {
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ok = WebPWorkerSync(worker);
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}
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assert(!ok || (worker->status_ == OK));
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return ok;
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}
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void WebPWorkerLaunch(WebPWorker* const worker) {
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#ifdef WEBP_USE_THREAD
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WebPWorkerChangeState(worker, WORK);
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#else
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if (worker->hook)
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worker->had_error |= !worker->hook(worker->data1, worker->data2);
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#endif
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}
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void WebPWorkerEnd(WebPWorker* const worker) {
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if (worker->status_ >= OK) {
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#ifdef WEBP_USE_THREAD
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WebPWorkerChangeState(worker, NOT_OK);
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pthread_join(worker->thread_, NULL);
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pthread_mutex_destroy(&worker->mutex_);
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pthread_cond_destroy(&worker->condition_);
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#else
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worker->status_ = NOT_OK;
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#endif
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}
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assert(worker->status_ == NOT_OK);
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}
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//------------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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