+#include "../stdafx.h"\r
+\r
+#include "tbb_avcodec.h"\r
+\r
+#include <common/log/log.h>\r
+#include <common/env.h>\r
+#include <common/utility/assert.h>\r
+\r
+#include <tbb/task.h>\r
+#include <tbb/atomic.h>\r
+#include <tbb/parallel_for.h>\r
+#include <tbb/tbb_thread.h>\r
+\r
+#if defined(_MSC_VER)\r
+#pragma warning (push)\r
+#pragma warning (disable : 4244)\r
+#endif\r
+extern "C" \r
+{\r
+ #define __STDC_CONSTANT_MACROS\r
+ #define __STDC_LIMIT_MACROS\r
+ #include <libavformat/avformat.h>\r
+}\r
+#if defined(_MSC_VER)\r
+#pragma warning (pop)\r
+#endif\r
+\r
+namespace caspar {\r
+ \r
+int thread_execute(AVCodecContext* s, int (*func)(AVCodecContext *c2, void *arg2), void* arg, int* ret, int count, int size)\r
+{\r
+ tbb::parallel_for(tbb::blocked_range<size_t>(0, count), [&](const tbb::blocked_range<size_t>& r)\r
+ {\r
+ for(size_t n = r.begin(); n != r.end(); ++n) \r
+ {\r
+ int r = func(s, reinterpret_cast<uint8_t*>(arg) + n*size);\r
+ if(ret)\r
+ ret[n] = r;\r
+ }\r
+ });\r
+\r
+ return 0;\r
+}\r
+\r
+int thread_execute2(AVCodecContext* s, int (*func)(AVCodecContext* c2, void* arg2, int, int), void* arg, int* ret, int count)\r
+{ \r
+ tbb::atomic<int> counter; \r
+ counter = 0; \r
+\r
+ CASPAR_ASSERT(tbb::tbb_thread::hardware_concurrency() < 16);\r
+ // Note: this will probably only work when tbb::task_scheduler_init::num_threads() < 16.\r
+ tbb::parallel_for(tbb::blocked_range<int>(0, count, 2), [&](const tbb::blocked_range<int> &r) \r
+ { \r
+ int threadnr = counter++; \r
+ for(int jobnr = r.begin(); jobnr != r.end(); ++jobnr)\r
+ { \r
+ int r = func(s, arg, jobnr, threadnr); \r
+ if (ret) \r
+ ret[jobnr] = r; \r
+ }\r
+ --counter;\r
+ }); \r
+\r
+ return 0; \r
+}\r
+\r
+void thread_init(AVCodecContext* s)\r
+{\r
+ static const size_t MAX_THREADS = 16; // See mpegvideo.h\r
+ static int dummy_opaque;\r
+\r
+ s->active_thread_type = FF_THREAD_SLICE;\r
+ s->thread_opaque = &dummy_opaque; \r
+ s->execute = thread_execute;\r
+ s->execute2 = thread_execute2;\r
+ s->thread_count = MAX_THREADS; // We are using a task-scheduler, so use as many "threads/tasks" as possible. \r
+\r
+ CASPAR_LOG(info) << "Initialized ffmpeg tbb context.";\r
+}\r
+\r
+void thread_free(AVCodecContext* s)\r
+{\r
+ if(!s->thread_opaque)\r
+ return;\r
+\r
+ s->thread_opaque = nullptr;\r
+ \r
+ CASPAR_LOG(info) << "Released ffmpeg tbb context.";\r
+}\r
+\r
+int tbb_avcodec_open(AVCodecContext* avctx, AVCodec* codec)\r
+{\r
+ CodecID supported_codecs[] = {CODEC_ID_MPEG2VIDEO, CODEC_ID_PRORES};\r
+\r
+ avctx->thread_count = 1;\r
+ // Some codecs don't like to have multiple multithreaded decoding instances. Only enable for those we know work.\r
+ if(std::find(std::begin(supported_codecs), std::end(supported_codecs), codec->id) != std::end(supported_codecs) && \r
+ (codec->capabilities & CODEC_CAP_SLICE_THREADS) && \r
+ (avctx->thread_type & FF_THREAD_SLICE))\r
+ {\r
+ thread_init(avctx);\r
+ } \r
+ // ff_thread_init will not be executed since thread_opaque != nullptr || thread_count == 1.\r
+ return avcodec_open(avctx, codec); \r
+}\r
+\r
+int tbb_avcodec_close(AVCodecContext* avctx)\r
+{\r
+ thread_free(avctx);\r
+ // ff_thread_free will not be executed since thread_opaque == nullptr.\r
+ return avcodec_close(avctx); \r
+}\r
+\r
+}
\ No newline at end of file