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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9 #include <common/utility/assert.h>
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11 #include <tbb/task.h>
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12 #include <tbb/atomic.h>
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13 #include <tbb/parallel_for.h>
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14 #include <tbb/tbb_thread.h>
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16 #if defined(_MSC_VER)
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17 #pragma warning (push)
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18 #pragma warning (disable : 4244)
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22 #define __STDC_CONSTANT_MACROS
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23 #define __STDC_LIMIT_MACROS
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24 #include <libavformat/avformat.h>
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26 #if defined(_MSC_VER)
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27 #pragma warning (pop)
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30 namespace caspar { namespace ffmpeg {
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32 int thread_execute(AVCodecContext* s, int (*func)(AVCodecContext *c2, void *arg2), void* arg, int* ret, int count, int size)
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34 tbb::parallel_for(tbb::blocked_range<size_t>(0, count), [&](const tbb::blocked_range<size_t>& r)
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36 for(size_t n = r.begin(); n != r.end(); ++n)
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38 int r = func(s, reinterpret_cast<uint8_t*>(arg) + n*size);
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47 int thread_execute2(AVCodecContext* s, int (*func)(AVCodecContext* c2, void* arg2, int, int), void* arg, int* ret, int count)
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49 tbb::atomic<int> counter;
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52 CASPAR_ASSERT(tbb::tbb_thread::hardware_concurrency() < 16);
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53 // Note: this will probably only work when tbb::task_scheduler_init::num_threads() < 16.
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54 tbb::parallel_for(tbb::blocked_range<int>(0, count, 2), [&](const tbb::blocked_range<int> &r)
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56 int threadnr = counter++;
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57 for(int jobnr = r.begin(); jobnr != r.end(); ++jobnr)
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59 int r = func(s, arg, jobnr, threadnr);
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69 void thread_init(AVCodecContext* s)
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71 static const size_t MAX_THREADS = 16; // See mpegvideo.h
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72 static int dummy_opaque;
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74 s->active_thread_type = FF_THREAD_SLICE;
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75 s->thread_opaque = &dummy_opaque;
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76 s->execute = thread_execute;
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77 s->execute2 = thread_execute2;
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78 s->thread_count = MAX_THREADS; // We are using a task-scheduler, so use as many "threads/tasks" as possible.
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80 CASPAR_LOG(info) << "Initialized ffmpeg tbb context.";
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83 void thread_free(AVCodecContext* s)
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85 if(!s->thread_opaque)
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88 s->thread_opaque = nullptr;
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90 CASPAR_LOG(info) << "Released ffmpeg tbb context.";
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93 int tbb_avcodec_open(AVCodecContext* avctx, AVCodec* codec)
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95 avctx->thread_count = 1;
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96 // Some codecs don't like to have multiple multithreaded decoding instances. Only enable for those we know work.
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97 if((codec->id == CODEC_ID_MPEG2VIDEO) &&
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98 (codec->capabilities & CODEC_CAP_SLICE_THREADS) &&
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99 (avctx->thread_type & FF_THREAD_SLICE))
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101 thread_init(avctx);
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103 // ff_thread_init will not be executed since thread_opaque != nullptr || thread_count == 1.
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104 return avcodec_open(avctx, codec);
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107 int tbb_avcodec_close(AVCodecContext* avctx)
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109 thread_free(avctx);
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110 // ff_thread_free will not be executed since thread_opaque == nullptr.
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111 return avcodec_close(avctx);
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