/* * Blackmagic DeckLink output * Copyright (c) 2013-2014 Ramiro Polla * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <DeckLinkAPI.h>#ifdef _WIN32#include <DeckLinkAPI_i.c>typedef unsigned long buffercount_type;#else#include <DeckLinkAPIDispatch.cpp>typedef uint32_t buffercount_type;#endif #include <pthread.h>#include <semaphore.h> extern "C" {#include "libavformat/avformat.h"#include "libavformat/internal.h"#include "libavutil/imgutils.h"} #include "decklink_enc.h" class decklink_callback; struct decklink_ctx {    /* DeckLink SDK interfaces */    IDeckLink *dl;    IDeckLinkOutput *dlo;    decklink_callback *callback;     /* DeckLink mode information */    IDeckLinkDisplayModeIterator *itermode;    BMDTimeValue bmd_tb_den;    BMDTimeValue bmd_tb_num;    BMDDisplayMode bmd_mode;    int bmd_width;    int bmd_height;     /* Streams present */    int audio;    int video;     /* Status */    int playback_started;    int64_t last_pts;     /* Options */    int list_devices;    int list_formats;    double preroll;     int frames_preroll;    int frames_buffer;     sem_t semaphore;     int channels;}; /* DeckLink callback class declaration */class decklink_frame : public IDeckLinkVideoFrame{public:    decklink_frame(struct decklink_ctx *ctx, AVFrame *avframe, long width,                   long height, void *buffer) :                   _ctx(ctx), _avframe(avframe), _width(width),                   _height(height), _buffer(buffer), _refs(0) { }     virtual long           STDMETHODCALLTYPE GetWidth      (void)          { return _width; }    virtual long           STDMETHODCALLTYPE GetHeight     (void)          { return _height; }    virtual long           STDMETHODCALLTYPE GetRowBytes   (void)          { return _width<<1; }    virtual BMDPixelFormat STDMETHODCALLTYPE GetPixelFormat(void)          { return bmdFormat8BitYUV; }    virtual BMDFrameFlags  STDMETHODCALLTYPE GetFlags      (void)          { return bmdVideoOutputFlagDefault; }    virtual HRESULT        STDMETHODCALLTYPE GetBytes      (void **buffer) { *buffer = _buffer; return S_OK; }     virtual HRESULT STDMETHODCALLTYPE GetTimecode     (BMDTimecodeFormat format, IDeckLinkTimecode **timecode) { return S_FALSE; }    virtual HRESULT STDMETHODCALLTYPE GetAncillaryData(IDeckLinkVideoFrameAncillary **ancillary)               { return S_FALSE; }     virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }    virtual ULONG   STDMETHODCALLTYPE AddRef(void)                            { return ++_refs; }    virtual ULONG   STDMETHODCALLTYPE Release(void)                           { if (!--_refs) delete this; return _refs; }     struct decklink_ctx *_ctx;    AVFrame *_avframe; private:    long  _width;    long  _height;    void *_buffer;    int   _refs;}; class decklink_callback : public IDeckLinkVideoOutputCallback{public:    virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame *_frame, BMDOutputFrameCompletionResult result)    {        decklink_frame *frame = static_cast<decklink_frame *>(_frame);        struct decklink_ctx *ctx = frame->_ctx;        AVFrame *avframe = frame->_avframe;         av_frame_free(&avframe);         sem_post(&ctx->semaphore);         return S_OK;    }    virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped(void)       { return S_OK; }    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }    virtual ULONG   STDMETHODCALLTYPE AddRef(void)                            { return 1; }    virtual ULONG   STDMETHODCALLTYPE Release(void)                           { return 1; }}; #ifdef _WIN32static IDeckLinkIterator *CreateDeckLinkIteratorInstance(void){    IDeckLinkIterator *iter;     if (CoInitialize(NULL) != S_OK) {        av_log(NULL, AV_LOG_ERROR, "COM initialization failed.\n");        return NULL;    }     if (CoCreateInstance(CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL,                         IID_IDeckLinkIterator, (void**) &iter) != S_OK) {        av_log(NULL, AV_LOG_ERROR, "DeckLink drivers not installed.\n");        return NULL;    }     return iter;}#endif /* free() is needed for a string returned by the DeckLink SDL. */#undef free #ifdef _WIN32static char *dup_wchar_to_utf8(wchar_t *w){    char *s = NULL;    int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);    s = (char *) av_malloc(l);    if (s)        WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);    return s;}#define DECKLINK_STR    OLECHAR *#define DECKLINK_STRDUP dup_wchar_to_utf8#else#define DECKLINK_STR    const char *#define DECKLINK_STRDUP av_strdup#endif static HRESULT IDeckLink_GetDisplayName(IDeckLink *This, const char **displayName){    DECKLINK_STR tmpDisplayName;    HRESULT hr = This->GetDisplayName(&tmpDisplayName);    if (hr != S_OK)        return hr;    *displayName = DECKLINK_STRDUP(tmpDisplayName);    free((void *) tmpDisplayName);    return hr;} static int decklink_set_format(struct decklink_ctx *ctx,                               int width, int height,                               int tb_num, int tb_den){    BMDDisplayModeSupport support;    IDeckLinkDisplayMode *mode;     if (tb_num == 1) {        tb_num *= 1000;        tb_den *= 1000;    }    ctx->bmd_mode = bmdModeUnknown;    while ((ctx->bmd_mode == bmdModeUnknown) && ctx->itermode->Next(&mode) == S_OK) {        BMDTimeValue bmd_tb_num, bmd_tb_den;        int bmd_width  = mode->GetWidth();        int bmd_height = mode->GetHeight();         mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);         if (bmd_width == width && bmd_height == height &&            bmd_tb_num == tb_num && bmd_tb_den == tb_den) {            ctx->bmd_mode   = mode->GetDisplayMode();            ctx->bmd_width  = bmd_width;            ctx->bmd_height = bmd_height;            ctx->bmd_tb_den = bmd_tb_den;            ctx->bmd_tb_num = bmd_tb_num;        }         mode->Release();    }    if (ctx->bmd_mode == bmdModeUnknown)        return -1;    if (ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,                                       bmdVideoOutputFlagDefault,                                       &support, NULL) != S_OK)        return -1;    if (support == bmdDisplayModeSupported)        return 0;     return -1;} static int decklink_setup_video(AVFormatContext *avctx, AVStream *st){    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;    AVCodecContext *c = st->codec;     if (ctx->video) {        av_log(avctx, AV_LOG_ERROR, "Only one video stream is supported!\n");        return -1;    }     if (c->pix_fmt != AV_PIX_FMT_UYVY422) {        av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format!"               " Only AV_PIX_FMT_UYVY422 is supported.\n");        return -1;    }    if (decklink_set_format(ctx, c->width, c->height,                            c->time_base.num, c->time_base.den)) {        av_log(avctx, AV_LOG_ERROR, "Unsupported video size or framerate!"               " Check available formats with -list_formats 1.\n");        return -1;    }    if (ctx->dlo->EnableVideoOutput(ctx->bmd_mode,                                    bmdVideoOutputFlagDefault) != S_OK) {        av_log(avctx, AV_LOG_ERROR, "Could not enable video output!\n");        return -1;    }     /* Set callback. */    ctx->callback = new decklink_callback();    ctx->dlo->SetScheduledFrameCompletionCallback(ctx->callback);     /* Start video semaphore. */    ctx->frames_preroll = c->time_base.den * ctx->preroll;    if (c->time_base.den > 1000)        ctx->frames_preroll /= 1000;     /* Buffer twice as many frames as the preroll. */    ctx->frames_buffer = ctx->frames_preroll * 2;    ctx->frames_buffer = FFMIN(ctx->frames_buffer, 60);    sem_init(&ctx->semaphore, 0, ctx->frames_buffer);     /* The device expects the framerate to be fixed. */    avpriv_set_pts_info(st, 64, c->time_base.num, c->time_base.den);     ctx->video = 1;     return 0;} static int decklink_setup_audio(AVFormatContext *avctx, AVStream *st){    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;    AVCodecContext *c = st->codec;     if (ctx->audio) {        av_log(avctx, AV_LOG_ERROR, "Only one audio stream is supported!\n");        return -1;    }    if (c->sample_rate != 48000) {        av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate!"               " Only 48kHz is supported.\n");        return -1;    }    if (c->channels != 2 && c->channels != 8) {        av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels!"               " Only stereo and 7.1 are supported.\n");        return -1;    }    if (ctx->dlo->EnableAudioOutput(bmdAudioSampleRate48kHz,                                    bmdAudioSampleType16bitInteger,                                    c->channels,                                    bmdAudioOutputStreamTimestamped) != S_OK) {        av_log(avctx, AV_LOG_ERROR, "Could not enable audio output!\n");        return -1;    }    if (ctx->dlo->BeginAudioPreroll() != S_OK) {        av_log(avctx, AV_LOG_ERROR, "Could not begin audio preroll!\n");        return -1;    }     /* The device expects the sample rate to be fixed. */    avpriv_set_pts_info(st, 64, 1, c->sample_rate);    ctx->channels = c->channels;     ctx->audio = 1;     return 0;} av_cold int ff_decklink_write_trailer(AVFormatContext *avctx){    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;     if (ctx->playback_started) {        BMDTimeValue actual;        ctx->dlo->StopScheduledPlayback(ctx->last_pts * ctx->bmd_tb_num,                                        &actual, ctx->bmd_tb_den);        ctx->dlo->DisableVideoOutput();        if (ctx->audio)            ctx->dlo->DisableAudioOutput();    }     if (ctx->dlo)        ctx->dlo->Release();    if (ctx->dl)        ctx->dl->Release();     if (ctx->callback)        delete ctx->callback;     sem_destroy(&ctx->semaphore);     av_freep(&cctx->ctx);     return 0;} static int decklink_write_video_packet(AVFormatContext *avctx, AVPacket *pkt){    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;    AVPicture *avpicture = (AVPicture *) pkt->data;    AVFrame *avframe, *tmp;    decklink_frame *frame;    buffercount_type buffered;    HRESULT hr;     /* HACK while av_uncoded_frame() isn't implemented */    int ret;     tmp = av_frame_alloc();    if (!tmp)        return AVERROR(ENOMEM);    tmp->format = AV_PIX_FMT_UYVY422;    tmp->width  = ctx->bmd_width;    tmp->height = ctx->bmd_height;    ret = av_frame_get_buffer(tmp, 32);    if (ret < 0) {        av_frame_free(&tmp);        return ret;    }    av_image_copy(tmp->data, tmp->linesize, (const uint8_t **) avpicture->data,                  avpicture->linesize, (AVPixelFormat) tmp->format, tmp->width,                  tmp->height);    avframe = av_frame_clone(tmp);    av_frame_free(&tmp);    if (!avframe) {        av_log(avctx, AV_LOG_ERROR, "Could not clone video frame.\n");        return AVERROR(EIO);    }    /* end HACK */     frame = new decklink_frame(ctx, avframe, ctx->bmd_width, ctx->bmd_height,                               (void *) avframe->data[0]);    if (!frame) {        av_log(avctx, AV_LOG_ERROR, "Could not create new frame.\n");        return AVERROR(EIO);    }     /* Always keep at most one second of frames buffered. */    sem_wait(&ctx->semaphore);     /* Schedule frame for playback. */    hr = ctx->dlo->ScheduleVideoFrame((struct IDeckLinkVideoFrame *) frame,                                      pkt->pts * ctx->bmd_tb_num,                                      ctx->bmd_tb_num, ctx->bmd_tb_den);    if (hr != S_OK) {        av_log(avctx, AV_LOG_ERROR, "Could not schedule video frame."                " error %08x.\n", (uint32_t) hr);        frame->Release();        return AVERROR(EIO);    }     ctx->dlo->GetBufferedVideoFrameCount(&buffered);    av_log(avctx, AV_LOG_DEBUG, "Buffered video frames: %d.\n", (int) buffered);    if (pkt->pts > 2 && buffered <= 2)        av_log(avctx, AV_LOG_WARNING, "There are not enough buffered video frames."               " Video may misbehave!\n");     /* Preroll video frames. */    if (!ctx->playback_started && pkt->pts > ctx->frames_preroll) {        av_log(avctx, AV_LOG_DEBUG, "Ending audio preroll.\n");        if (ctx->audio && ctx->dlo->EndAudioPreroll() != S_OK) {            av_log(avctx, AV_LOG_ERROR, "Could not end audio preroll!\n");            return AVERROR(EIO);        }        av_log(avctx, AV_LOG_DEBUG, "Starting scheduled playback.\n");        if (ctx->dlo->StartScheduledPlayback(0, ctx->bmd_tb_den, 1.0) != S_OK) {            av_log(avctx, AV_LOG_ERROR, "Could not start scheduled playback!\n");            return AVERROR(EIO);        }        ctx->playback_started = 1;    }     return 0;} static int decklink_write_audio_packet(AVFormatContext *avctx, AVPacket *pkt){    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;    int sample_count = pkt->size / (ctx->channels << 1);    buffercount_type buffered;     ctx->dlo->GetBufferedAudioSampleFrameCount(&buffered);    if (pkt->pts > 1 && !buffered)        av_log(avctx, AV_LOG_WARNING, "There's no buffered audio."               " Audio will misbehave!\n");     if (ctx->dlo->ScheduleAudioSamples(pkt->data, sample_count, pkt->pts,                                       bmdAudioSampleRate48kHz, NULL) != S_OK) {        av_log(avctx, AV_LOG_ERROR, "Could not schedule audio samples.\n");        return AVERROR(EIO);    }     return 0;} extern "C" { av_cold int ff_decklink_write_header(AVFormatContext *avctx){    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;    struct decklink_ctx *ctx;    IDeckLinkIterator *iter;    IDeckLink *dl = NULL;    unsigned int n;     ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));    if (!ctx)        return AVERROR(ENOMEM);    ctx->list_devices = cctx->list_devices;    ctx->list_formats = cctx->list_formats;    ctx->preroll      = cctx->preroll;    cctx->ctx = ctx;     iter = CreateDeckLinkIteratorInstance();    if (!iter) {        av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n");        return AVERROR(EIO);    }     /* List available devices. */    if (ctx->list_devices) {        av_log(avctx, AV_LOG_INFO, "Blackmagic DeckLink devices:\n");        while (iter->Next(&dl) == S_OK) {            const char *displayName;            IDeckLink_GetDisplayName(dl, &displayName);            av_log(avctx, AV_LOG_INFO, "\t'%s'\n", displayName);            av_free((void *) displayName);            dl->Release();        }        iter->Release();        return AVERROR_EXIT;    }     /* Open device. */    while (iter->Next(&dl) == S_OK) {        const char *displayName;        IDeckLink_GetDisplayName(dl, &displayName);        if (!strcmp(avctx->filename, displayName)) {            av_free((void *) displayName);            ctx->dl = dl;            break;        }        av_free((void *) displayName);        dl->Release();    }    iter->Release();    if (!ctx->dl) {        av_log(avctx, AV_LOG_ERROR, "Could not open '%s'\n", avctx->filename);        return AVERROR(EIO);

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