1 // Author Robert Nagy
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5 #include "tbb_avcodec.h"
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7 #include <common/log/log.h>
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8 #include <common/env.h>
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10 #include <tbb/task.h>
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11 #include <tbb/atomic.h>
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12 #include <tbb/tbb_thread.h>
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15 #include <boost/algorithm/string.hpp>
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19 #define __STDC_CONSTANT_MACROS
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20 #define __STDC_LIMIT_MACROS
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21 #include <libavformat/avformat.h>
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26 int thread_execute(AVCodecContext* s, int (*func)(AVCodecContext *c2, void *arg2), void* arg, int* ret, int count, int size)
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28 tbb::parallel_for(tbb::blocked_range<size_t>(0, count), [&](const tbb::blocked_range<size_t>& r)
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30 for(size_t n = r.begin(); n != r.end(); ++n)
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32 int r = func(s, reinterpret_cast<uint8_t*>(arg) + n*size);
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41 int thread_execute2(AVCodecContext* s, int (*func)(AVCodecContext* c2, void* arg2, int, int), void* arg, int* ret, int count)
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43 tbb::atomic<int> counter;
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46 CASPAR_ASSERT(tbb::tbb_thread::hardware_concurrency() < 16);
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47 // Note: this will probably only work when tbb::task_scheduler_init::num_threads() < 16.
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48 tbb::parallel_for(tbb::blocked_range<int>(0, count, 2), [&](const tbb::blocked_range<int> &r)
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50 int threadnr = counter++;
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51 for(int jobnr = r.begin(); jobnr != r.end(); ++jobnr)
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53 int r = func(s, arg, jobnr, threadnr);
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63 void thread_init(AVCodecContext* s)
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65 static const size_t MAX_THREADS = 16; // See mpegvideo.h
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66 static int dummy_opaque;
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68 s->active_thread_type = FF_THREAD_SLICE;
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69 s->thread_opaque = &dummy_opaque;
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70 s->execute = thread_execute;
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71 s->execute2 = thread_execute2;
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72 s->thread_count = MAX_THREADS; // We are using a task-scheduler, so use as many "threads/tasks" as possible.
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74 CASPAR_LOG(info) << "Initialized ffmpeg tbb context.";
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77 void thread_free(AVCodecContext* s)
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79 if(!s->thread_opaque)
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82 s->thread_opaque = nullptr;
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84 CASPAR_LOG(info) << "Released ffmpeg tbb context.";
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87 int tbb_avcodec_open(AVCodecContext* avctx, AVCodec* codec)
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89 avctx->thread_count = 1;
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90 // Some codecs don't like to have multiple multithreaded decoding instances. Only enable for those we know work.
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91 if((codec->id == CODEC_ID_MPEG2VIDEO) &&
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92 (codec->capabilities & CODEC_CAP_SLICE_THREADS) &&
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93 (avctx->thread_type & FF_THREAD_SLICE))
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97 // ff_thread_init will not be executed since thread_opaque != nullptr || thread_count == 1.
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98 return avcodec_open(avctx, codec);
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101 int tbb_avcodec_close(AVCodecContext* avctx)
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103 thread_free(avctx);
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104 // ff_thread_free will not be executed since thread_opaque == nullptr.
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105 return avcodec_close(avctx);
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