/* * 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> #include <pthread.h>#include <semaphore.h> extern "C" {#include "libavformat/avformat.h"#include "libavformat/internal.h"#include "libavutil/imgutils.h"#include "libavutil/atomic.h"} #include "decklink_common.h"#include "decklink_enc.h"  /* DeckLink callback class declaration */class decklink_frame : public IDeckLinkVideoFrame{public:    decklink_frame(struct decklink_ctx *ctx, AVFrame *avframe) :                   _ctx(ctx), _avframe(avframe),  _refs(1) { }     virtual long           STDMETHODCALLTYPE GetWidth      (void)          { return _avframe->width; }    virtual long           STDMETHODCALLTYPE GetHeight     (void)          { return _avframe->height; }    virtual long           STDMETHODCALLTYPE GetRowBytes   (void)          { return _avframe->linesize[0] < 0 ? -_avframe->linesize[0] : _avframe->linesize[0]; }    virtual BMDPixelFormat STDMETHODCALLTYPE GetPixelFormat(void)          { return bmdFormat8BitYUV; }    virtual BMDFrameFlags  STDMETHODCALLTYPE GetFlags      (void)          { return _avframe->linesize[0] < 0 ? bmdFrameFlagFlipVertical : bmdFrameFlagDefault; }    virtual HRESULT        STDMETHODCALLTYPE GetBytes      (void **buffer)    {        if (_avframe->linesize[0] < 0)            *buffer = (void *)(_avframe->data[0] + _avframe->linesize[0] * (_avframe->height - 1));        else            *buffer = (void *)(_avframe->data[0]);        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 avpriv_atomic_int_add_and_fetch(&_refs, 1); }    virtual ULONG   STDMETHODCALLTYPE Release(void)    {        int ret = avpriv_atomic_int_add_and_fetch(&_refs, -1);        if (!ret) {            av_frame_free(&_avframe);            delete this;        }        return ret;    }     struct decklink_ctx *_ctx;    AVFrame *_avframe; private:    volatile int   _refs;}; class decklink_output_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_unref(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; }}; 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;    AVCodecParameters *c = st->codecpar;     if (ctx->video) {        av_log(avctx, AV_LOG_ERROR, "Only one video stream is supported!\n");        return -1;    }     if (c->format != AV_PIX_FMT_UYVY422) {        av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format!"               " Only AV_PIX_FMT_UYVY422 is supported.\n");        return -1;    }    if (ff_decklink_set_format(avctx, c->width, c->height,                            st->time_base.num, st->time_base.den, c->field_order)) {        av_log(avctx, AV_LOG_ERROR, "Unsupported video size, framerate or field order!"               " 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->output_callback = new decklink_output_callback();    ctx->dlo->SetScheduledFrameCompletionCallback(ctx->output_callback);     /* Start video semaphore. */    ctx->frames_preroll = st->time_base.den * ctx->preroll;    if (st->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, st->time_base.num, st->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;    AVCodecParameters *c = st->codecpar;     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();    }     ff_decklink_cleanup(avctx);     if (ctx->output_callback)        delete ctx->output_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;    AVFrame *avframe, *tmp = (AVFrame *)pkt->data;    decklink_frame *frame;    buffercount_type buffered;    HRESULT hr;     if (tmp->format != AV_PIX_FMT_UYVY422 ||        tmp->width  != ctx->bmd_width ||        tmp->height != ctx->bmd_height) {        av_log(avctx, AV_LOG_ERROR, "Got a frame with invalid pixel format or dimension.\n");        return AVERROR(EINVAL);    }    avframe = av_frame_clone(tmp);    if (!avframe) {        av_log(avctx, AV_LOG_ERROR, "Could not clone video frame.\n");        return AVERROR(EIO);    }     frame = new decklink_frame(ctx, avframe);    if (!frame) {        av_log(avctx, AV_LOG_ERROR, "Could not create new frame.\n");        av_frame_free(&avframe);        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);    /* Pass ownership to DeckLink, or release on failure */    frame->Release();    if (hr != S_OK) {        av_log(avctx, AV_LOG_ERROR, "Could not schedule video frame."                " error %08x.\n", (uint32_t) hr);        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;    unsigned int n;    int ret;     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;     /* List available devices. */    if (ctx->list_devices) {        ff_decklink_list_devices(avctx);        return AVERROR_EXIT;    }     ret = ff_decklink_init_device(avctx, avctx->filename);    if (ret < 0)        return ret;     /* Get output device. */    if (ctx->dl->QueryInterface(IID_IDeckLinkOutput, (void **) &ctx->dlo) != S_OK) {        av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",               avctx->filename);        ret = AVERROR(EIO);        goto error;    }     /* List supported formats. */    if (ctx->list_formats) {        ff_decklink_list_formats(avctx);        ret = AVERROR_EXIT;        goto error;    }     /* Setup streams. */    ret = AVERROR(EIO);    for (n = 0; n < avctx->nb_streams; n++) {        AVStream *st = avctx->streams[n];        AVCodecParameters *c = st->codecpar;        if        (c->codec_type == AVMEDIA_TYPE_AUDIO) {            if (decklink_setup_audio(avctx, st))                goto error;        } else if (c->codec_type == AVMEDIA_TYPE_VIDEO) {            if (decklink_setup_video(avctx, st))                goto error;        } else {            av_log(avctx, AV_LOG_ERROR, "Unsupported stream type.\n");            goto error;        }    }     return 0; error:    ff_decklink_cleanup(avctx);    return ret;} int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt){    struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;    struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;    AVStream *st = avctx->streams[pkt->stream_index];     ctx->last_pts = FFMAX(ctx->last_pts, pkt->pts);     if      (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)        return decklink_write_video_packet(avctx, pkt);    else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)        return decklink_write_audio_packet(avctx, pkt);     return AVERROR(EIO);} } /* extern "C" */