vp9/decoder: add thread worker
vp9/decoder/vp9_thread.[hc]
Original source:
http://git.chromium.org/webm/libwebp.git
100644 blob b1615d0fb8d311666b2fa4561076c62d72c2e3ff src/utils/thread.c
100644 blob 13a61a4c84194c3374080cbf03d881d3cd6af40d src/utils/thread.h
Local modifications:
- s/WebP/VP9/g
- camelcase functions -> lower with _'s
Change-Id: Ib6932640ee34f8b4782c6fbd15864a59d5d4c5fe
diff --git a/vp9/decoder/vp9_thread.h b/vp9/decoder/vp9_thread.h
new file mode 100644
index 0000000..a8f7e04
--- /dev/null
+++ b/vp9/decoder/vp9_thread.h
@@ -0,0 +1,93 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Multi-threaded worker
+//
+// Original source:
+// http://git.chromium.org/webm/libwebp.git
+// 100644 blob 13a61a4c84194c3374080cbf03d881d3cd6af40d src/utils/thread.h
+
+
+#ifndef VP9_DECODER_VP9_THREAD_H_
+#define VP9_DECODER_VP9_THREAD_H_
+
+#include "vpx_config.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#if CONFIG_MULTITHREAD
+
+#if defined(_WIN32)
+
+#include <windows.h>
+typedef HANDLE pthread_t;
+typedef CRITICAL_SECTION pthread_mutex_t;
+typedef struct {
+ HANDLE waiting_sem_;
+ HANDLE received_sem_;
+ HANDLE signal_event_;
+} pthread_cond_t;
+
+#else
+
+#include <pthread.h>
+
+#endif /* _WIN32 */
+#endif /* CONFIG_MULTITHREAD */
+
+// State of the worker thread object
+typedef enum {
+ NOT_OK = 0, // object is unusable
+ OK, // ready to work
+ WORK // busy finishing the current task
+} VP9WorkerStatus;
+
+// Function to be called by the worker thread. Takes two opaque pointers as
+// arguments (data1 and data2), and should return false in case of error.
+typedef int (*VP9WorkerHook)(void*, void*);
+
+// Synchronize object used to launch job in the worker thread
+typedef struct {
+#if CONFIG_MULTITHREAD
+ pthread_mutex_t mutex_;
+ pthread_cond_t condition_;
+ pthread_t thread_;
+#endif
+ VP9WorkerStatus status_;
+ VP9WorkerHook hook; // hook to call
+ void* data1; // first argument passed to 'hook'
+ void* data2; // second argument passed to 'hook'
+ int had_error; // return value of the last call to 'hook'
+} VP9Worker;
+
+// Must be called first, before any other method.
+void vp9_worker_init(VP9Worker* const worker);
+// Must be called to initialize the object and spawn the thread. Re-entrant.
+// Will potentially launch the thread. Returns false in case of error.
+int vp9_worker_reset(VP9Worker* const worker);
+// Makes sure the previous work is finished. Returns true if worker->had_error
+// was not set and no error condition was triggered by the working thread.
+int vp9_worker_sync(VP9Worker* const worker);
+// Triggers the thread to call hook() with data1 and data2 argument. These
+// hook/data1/data2 can be changed at any time before calling this function,
+// but not be changed afterward until the next call to vp9_worker_sync().
+void vp9_worker_launch(VP9Worker* const worker);
+// Kill the thread and terminate the object. To use the object again, one
+// must call vp9_worker_reset() again.
+void vp9_worker_end(VP9Worker* const worker);
+
+//------------------------------------------------------------------------------
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} // extern "C"
+#endif
+
+#endif /* VP9_DECODER_VP9_THREAD_H_ */
