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decklink_enc.cpp
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1 /*
2  * Blackmagic DeckLink output
3  * Copyright (c) 2013-2014 Ramiro Polla
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <DeckLinkAPI.h>
23 
24 #include <pthread.h>
25 #include <semaphore.h>
26 
27 extern "C" {
28 #include "libavformat/avformat.h"
29 #include "libavformat/internal.h"
30 #include "libavutil/imgutils.h"
31 }
32 
33 #include "decklink_common.h"
34 #include "decklink_enc.h"
35 
36 
37 /* DeckLink callback class declaration */
38 class decklink_frame : public IDeckLinkVideoFrame
39 {
40 public:
41  decklink_frame(struct decklink_ctx *ctx, AVFrame *avframe, long width,
42  long height, void *buffer) :
43  _ctx(ctx), _avframe(avframe), _width(width),
44  _height(height), _buffer(buffer), _refs(0) { }
45 
46  virtual long STDMETHODCALLTYPE GetWidth (void) { return _width; }
47  virtual long STDMETHODCALLTYPE GetHeight (void) { return _height; }
48  virtual long STDMETHODCALLTYPE GetRowBytes (void) { return _width<<1; }
49  virtual BMDPixelFormat STDMETHODCALLTYPE GetPixelFormat(void) { return bmdFormat8BitYUV; }
50  virtual BMDFrameFlags STDMETHODCALLTYPE GetFlags (void) { return bmdVideoOutputFlagDefault; }
51  virtual HRESULT STDMETHODCALLTYPE GetBytes (void **buffer) { *buffer = _buffer; return S_OK; }
52 
53  virtual HRESULT STDMETHODCALLTYPE GetTimecode (BMDTimecodeFormat format, IDeckLinkTimecode **timecode) { return S_FALSE; }
54  virtual HRESULT STDMETHODCALLTYPE GetAncillaryData(IDeckLinkVideoFrameAncillary **ancillary) { return S_FALSE; }
55 
56  virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
57  virtual ULONG STDMETHODCALLTYPE AddRef(void) { return ++_refs; }
58  virtual ULONG STDMETHODCALLTYPE Release(void) { if (!--_refs) delete this; return _refs; }
59 
60  struct decklink_ctx *_ctx;
61  AVFrame *_avframe;
62 
63 private:
64  long _width;
65  long _height;
66  void *_buffer;
67  int _refs;
68 };
69 
70 class decklink_output_callback : public IDeckLinkVideoOutputCallback
71 {
72 public:
73  virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame *_frame, BMDOutputFrameCompletionResult result)
74  {
75  decklink_frame *frame = static_cast<decklink_frame *>(_frame);
76  struct decklink_ctx *ctx = frame->_ctx;
77  AVFrame *avframe = frame->_avframe;
78 
79  av_frame_free(&avframe);
80 
81  sem_post(&ctx->semaphore);
82 
83  return S_OK;
84  }
85  virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped(void) { return S_OK; }
86  virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
87  virtual ULONG STDMETHODCALLTYPE AddRef(void) { return 1; }
88  virtual ULONG STDMETHODCALLTYPE Release(void) { return 1; }
89 };
90 
91 static int decklink_setup_video(AVFormatContext *avctx, AVStream *st)
92 {
93  struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
94  struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
95  AVCodecContext *c = st->codec;
96 
97  if (ctx->video) {
98  av_log(avctx, AV_LOG_ERROR, "Only one video stream is supported!\n");
99  return -1;
100  }
101 
102  if (c->pix_fmt != AV_PIX_FMT_UYVY422) {
103  av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format!"
104  " Only AV_PIX_FMT_UYVY422 is supported.\n");
105  return -1;
106  }
107  if (ff_decklink_set_format(avctx, c->width, c->height,
108  c->time_base.num, c->time_base.den)) {
109  av_log(avctx, AV_LOG_ERROR, "Unsupported video size or framerate!"
110  " Check available formats with -list_formats 1.\n");
111  return -1;
112  }
113  if (ctx->dlo->EnableVideoOutput(ctx->bmd_mode,
114  bmdVideoOutputFlagDefault) != S_OK) {
115  av_log(avctx, AV_LOG_ERROR, "Could not enable video output!\n");
116  return -1;
117  }
118 
119  /* Set callback. */
120  ctx->output_callback = new decklink_output_callback();
121  ctx->dlo->SetScheduledFrameCompletionCallback(ctx->output_callback);
122 
123  /* Start video semaphore. */
124  ctx->frames_preroll = c->time_base.den * ctx->preroll;
125  if (c->time_base.den > 1000)
126  ctx->frames_preroll /= 1000;
127 
128  /* Buffer twice as many frames as the preroll. */
129  ctx->frames_buffer = ctx->frames_preroll * 2;
130  ctx->frames_buffer = FFMIN(ctx->frames_buffer, 60);
131  sem_init(&ctx->semaphore, 0, ctx->frames_buffer);
132 
133  /* The device expects the framerate to be fixed. */
134  avpriv_set_pts_info(st, 64, c->time_base.num, c->time_base.den);
135 
136  ctx->video = 1;
137 
138  return 0;
139 }
140 
141 static int decklink_setup_audio(AVFormatContext *avctx, AVStream *st)
142 {
143  struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
144  struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
145  AVCodecContext *c = st->codec;
146 
147  if (ctx->audio) {
148  av_log(avctx, AV_LOG_ERROR, "Only one audio stream is supported!\n");
149  return -1;
150  }
151  if (c->sample_rate != 48000) {
152  av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate!"
153  " Only 48kHz is supported.\n");
154  return -1;
155  }
156  if (c->channels != 2 && c->channels != 8) {
157  av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels!"
158  " Only stereo and 7.1 are supported.\n");
159  return -1;
160  }
161  if (ctx->dlo->EnableAudioOutput(bmdAudioSampleRate48kHz,
162  bmdAudioSampleType16bitInteger,
163  c->channels,
164  bmdAudioOutputStreamTimestamped) != S_OK) {
165  av_log(avctx, AV_LOG_ERROR, "Could not enable audio output!\n");
166  return -1;
167  }
168  if (ctx->dlo->BeginAudioPreroll() != S_OK) {
169  av_log(avctx, AV_LOG_ERROR, "Could not begin audio preroll!\n");
170  return -1;
171  }
172 
173  /* The device expects the sample rate to be fixed. */
174  avpriv_set_pts_info(st, 64, 1, c->sample_rate);
175  ctx->channels = c->channels;
176 
177  ctx->audio = 1;
178 
179  return 0;
180 }
181 
182 av_cold int ff_decklink_write_trailer(AVFormatContext *avctx)
183 {
184  struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
185  struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
186 
187  if (ctx->playback_started) {
188  BMDTimeValue actual;
189  ctx->dlo->StopScheduledPlayback(ctx->last_pts * ctx->bmd_tb_num,
190  &actual, ctx->bmd_tb_den);
191  ctx->dlo->DisableVideoOutput();
192  if (ctx->audio)
193  ctx->dlo->DisableAudioOutput();
194  }
195 
196  if (ctx->dlo)
197  ctx->dlo->Release();
198  if (ctx->dl)
199  ctx->dl->Release();
200 
201  if (ctx->output_callback)
202  delete ctx->output_callback;
203 
204  sem_destroy(&ctx->semaphore);
205 
206  av_freep(&cctx->ctx);
207 
208  return 0;
209 }
210 
211 static int decklink_write_video_packet(AVFormatContext *avctx, AVPacket *pkt)
212 {
213  struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
214  struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
215  AVPicture *avpicture = (AVPicture *) pkt->data;
216  AVFrame *avframe, *tmp;
217  decklink_frame *frame;
218  buffercount_type buffered;
219  HRESULT hr;
220 
221  /* HACK while av_uncoded_frame() isn't implemented */
222  int ret;
223 
224  tmp = av_frame_alloc();
225  if (!tmp)
226  return AVERROR(ENOMEM);
227  tmp->format = AV_PIX_FMT_UYVY422;
228  tmp->width = ctx->bmd_width;
229  tmp->height = ctx->bmd_height;
230  ret = av_frame_get_buffer(tmp, 32);
231  if (ret < 0) {
232  av_frame_free(&tmp);
233  return ret;
234  }
235  av_image_copy(tmp->data, tmp->linesize, (const uint8_t **) avpicture->data,
236  avpicture->linesize, (AVPixelFormat) tmp->format, tmp->width,
237  tmp->height);
238  avframe = av_frame_clone(tmp);
239  av_frame_free(&tmp);
240  if (!avframe) {
241  av_log(avctx, AV_LOG_ERROR, "Could not clone video frame.\n");
242  return AVERROR(EIO);
243  }
244  /* end HACK */
245 
246  frame = new decklink_frame(ctx, avframe, ctx->bmd_width, ctx->bmd_height,
247  (void *) avframe->data[0]);
248  if (!frame) {
249  av_log(avctx, AV_LOG_ERROR, "Could not create new frame.\n");
250  return AVERROR(EIO);
251  }
252 
253  /* Always keep at most one second of frames buffered. */
254  sem_wait(&ctx->semaphore);
255 
256  /* Schedule frame for playback. */
257  hr = ctx->dlo->ScheduleVideoFrame((struct IDeckLinkVideoFrame *) frame,
258  pkt->pts * ctx->bmd_tb_num,
259  ctx->bmd_tb_num, ctx->bmd_tb_den);
260  if (hr != S_OK) {
261  av_log(avctx, AV_LOG_ERROR, "Could not schedule video frame."
262  " error %08x.\n", (uint32_t) hr);
263  frame->Release();
264  return AVERROR(EIO);
265  }
266 
267  ctx->dlo->GetBufferedVideoFrameCount(&buffered);
268  av_log(avctx, AV_LOG_DEBUG, "Buffered video frames: %d.\n", (int) buffered);
269  if (pkt->pts > 2 && buffered <= 2)
270  av_log(avctx, AV_LOG_WARNING, "There are not enough buffered video frames."
271  " Video may misbehave!\n");
272 
273  /* Preroll video frames. */
274  if (!ctx->playback_started && pkt->pts > ctx->frames_preroll) {
275  av_log(avctx, AV_LOG_DEBUG, "Ending audio preroll.\n");
276  if (ctx->audio && ctx->dlo->EndAudioPreroll() != S_OK) {
277  av_log(avctx, AV_LOG_ERROR, "Could not end audio preroll!\n");
278  return AVERROR(EIO);
279  }
280  av_log(avctx, AV_LOG_DEBUG, "Starting scheduled playback.\n");
281  if (ctx->dlo->StartScheduledPlayback(0, ctx->bmd_tb_den, 1.0) != S_OK) {
282  av_log(avctx, AV_LOG_ERROR, "Could not start scheduled playback!\n");
283  return AVERROR(EIO);
284  }
285  ctx->playback_started = 1;
286  }
287 
288  return 0;
289 }
290 
291 static int decklink_write_audio_packet(AVFormatContext *avctx, AVPacket *pkt)
292 {
293  struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
294  struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
295  int sample_count = pkt->size / (ctx->channels << 1);
296  buffercount_type buffered;
297 
298  ctx->dlo->GetBufferedAudioSampleFrameCount(&buffered);
299  if (pkt->pts > 1 && !buffered)
300  av_log(avctx, AV_LOG_WARNING, "There's no buffered audio."
301  " Audio will misbehave!\n");
302 
303  if (ctx->dlo->ScheduleAudioSamples(pkt->data, sample_count, pkt->pts,
304  bmdAudioSampleRate48kHz, NULL) != S_OK) {
305  av_log(avctx, AV_LOG_ERROR, "Could not schedule audio samples.\n");
306  return AVERROR(EIO);
307  }
308 
309  return 0;
310 }
311 
312 extern "C" {
313 
314 av_cold int ff_decklink_write_header(AVFormatContext *avctx)
315 {
316  struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
317  struct decklink_ctx *ctx;
318  IDeckLinkDisplayModeIterator *itermode;
319  IDeckLinkIterator *iter;
320  IDeckLink *dl = NULL;
321  unsigned int n;
322 
323  ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
324  if (!ctx)
325  return AVERROR(ENOMEM);
326  ctx->list_devices = cctx->list_devices;
327  ctx->list_formats = cctx->list_formats;
328  ctx->preroll = cctx->preroll;
329  cctx->ctx = ctx;
330 
331  iter = CreateDeckLinkIteratorInstance();
332  if (!iter) {
333  av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n");
334  return AVERROR(EIO);
335  }
336 
337  /* List available devices. */
338  if (ctx->list_devices) {
339  ff_decklink_list_devices(avctx);
340  return AVERROR_EXIT;
341  }
342 
343  /* Open device. */
344  while (iter->Next(&dl) == S_OK) {
345  const char *displayName;
346  ff_decklink_get_display_name(dl, &displayName);
347  if (!strcmp(avctx->filename, displayName)) {
348  av_free((void *) displayName);
349  ctx->dl = dl;
350  break;
351  }
352  av_free((void *) displayName);
353  dl->Release();
354  }
355  iter->Release();
356  if (!ctx->dl) {
357  av_log(avctx, AV_LOG_ERROR, "Could not open '%s'\n", avctx->filename);
358  return AVERROR(EIO);
359  }
360 
361  /* Get output device. */
362  if (ctx->dl->QueryInterface(IID_IDeckLinkOutput, (void **) &ctx->dlo) != S_OK) {
363  av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",
364  avctx->filename);
365  ctx->dl->Release();
366  return AVERROR(EIO);
367  }
368 
369  /* List supported formats. */
370  if (ctx->list_formats) {
371  ff_decklink_list_formats(avctx);
372  ctx->dlo->Release();
373  ctx->dl->Release();
374  return AVERROR_EXIT;
375  }
376 
377  if (ctx->dlo->GetDisplayModeIterator(&itermode) != S_OK) {
378  av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
379  ctx->dl->Release();
380  return AVERROR(EIO);
381  }
382 
383  /* Setup streams. */
384  for (n = 0; n < avctx->nb_streams; n++) {
385  AVStream *st = avctx->streams[n];
386  AVCodecContext *c = st->codec;
387  if (c->codec_type == AVMEDIA_TYPE_AUDIO) {
388  if (decklink_setup_audio(avctx, st))
389  goto error;
390  } else if (c->codec_type == AVMEDIA_TYPE_VIDEO) {
391  if (decklink_setup_video(avctx, st))
392  goto error;
393  } else {
394  av_log(avctx, AV_LOG_ERROR, "Unsupported stream type.\n");
395  goto error;
396  }
397  }
398  itermode->Release();
399 
400  return 0;
401 
402 error:
403 
404  ctx->dlo->Release();
405  ctx->dl->Release();
406 
407  return AVERROR(EIO);
408 }
409 
410 int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt)
411 {
412  struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
413  struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
414  AVStream *st = avctx->streams[pkt->stream_index];
415 
416  ctx->last_pts = FFMAX(ctx->last_pts, pkt->pts);
417 
418  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
419  return decklink_write_video_packet(avctx, pkt);
420  else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
421  return decklink_write_audio_packet(avctx, pkt);
422 
423  return AVERROR(EIO);
424 }
425 
426 } /* extern "C" */
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