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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14 #include <boost/algorithm/string.hpp>
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18 #define __STDC_CONSTANT_MACROS
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19 #define __STDC_LIMIT_MACROS
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20 #include <libavformat/avformat.h>
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25 int thread_execute(AVCodecContext* s, int (*func)(AVCodecContext *c2, void *arg2), void* arg, int* ret, int count, int size)
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27 tbb::parallel_for(tbb::blocked_range<size_t>(0, count), [&](const tbb::blocked_range<size_t>& r)
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29 for(size_t n = r.begin(); n != r.end(); ++n)
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31 int r = func(s, reinterpret_cast<uint8_t*>(arg) + n*size);
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40 int thread_execute2(AVCodecContext* s, int (*func)(AVCodecContext* c2, void* arg2, int, int), void* arg, int* ret, int count)
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42 tbb::atomic<int> counter;
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45 // Execute s->thread_count number of tasks in parallel.
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46 tbb::parallel_for(0, s->thread_count, 1, [&](int threadnr)
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50 int jobnr = counter++;
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54 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 s->thread_opaque = nullptr;
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81 CASPAR_LOG(info) << "Released ffmpeg tbb context.";
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84 int tbb_avcodec_open(AVCodecContext* avctx, AVCodec* codec)
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86 avctx->thread_count = 1;
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87 // Some codecs don't like to have multiple multithreaded decoding instances. Only enable for those we know work.
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88 if(codec->id == CODEC_ID_MPEG2VIDEO &&
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89 (codec->capabilities & CODEC_CAP_SLICE_THREADS) &&
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90 (avctx->thread_type & FF_THREAD_SLICE))
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94 // ff_thread_init will not be executed since thread_opaque != nullptr || thread_count == 1.
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95 return avcodec_open(avctx, codec);
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98 int tbb_avcodec_close(AVCodecContext* avctx)
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100 thread_free(avctx);
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101 // ff_thread_free will not be executed since thread_opaque == nullptr.
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102 return avcodec_close(avctx);
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