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ffmpeg/libavdevice/decklink_enc.cpp

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/*
* 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 <atomic>
using std::atomic;
/* Include internal.h first to avoid conflict between winsock.h (used by
* DeckLink headers) and winsock2.h (used by libavformat) in MSVC++ builds */
extern "C" {
#include "libavformat/internal.h"
}
#include <DeckLinkAPI.h>
extern "C" {
#include "libavformat/avformat.h"
#include "libavutil/imgutils.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 ++_refs; }
virtual ULONG STDMETHODCALLTYPE Release(void)
{
int ret = --_refs;
if (!ret) {
av_frame_free(&_avframe);
delete this;
}
return ret;
}
struct decklink_ctx *_ctx;
AVFrame *_avframe;
private:
std::atomic<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);
pthread_mutex_lock(&ctx->mutex);
ctx->frames_buffer_available_spots++;
pthread_cond_broadcast(&ctx->cond);
pthread_mutex_unlock(&ctx->mutex);
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);
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);
pthread_mutex_init(&ctx->mutex, NULL);
pthread_cond_init(&ctx->cond, NULL);
ctx->frames_buffer_available_spots = 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;
pthread_mutex_destroy(&ctx->mutex);
pthread_cond_destroy(&ctx->cond);
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. */
pthread_mutex_lock(&ctx->mutex);
while (ctx->frames_buffer_available_spots == 0) {
pthread_cond_wait(&ctx->cond, &ctx->mutex);
}
ctx->frames_buffer_available_spots--;
pthread_mutex_unlock(&ctx->mutex);
/* 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" */
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