FFmpeg: libavdevice/decklink_enc.cpp Source File

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decklink_enc.cpp

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1 /*

2 * Blackmagic DeckLink output

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 */

22 #include <DeckLinkAPI.h>

23 #ifdef _WIN32

24 #include <DeckLinkAPI_i.c>

25 typedef unsigned long buffercount_type;

26 #else

27 #include <DeckLinkAPIDispatch.cpp>

28 typedef uint32_t buffercount_type;

29 #endif

31 #include <pthread.h>

32 #include <semaphore.h>

34 extern "C" {

35 #include "libavformat/avformat.h"

36 #include "libavformat/internal.h"

37 #include "libavutil/imgutils.h"

38 }

40 #include "decklink_enc.h"

42 class decklink_callback;

44 struct decklink_ctx {

45 /* DeckLink SDK interfaces */

46 IDeckLink *dl;

47 IDeckLinkOutput *dlo;

48 decklink_callback *callback;

50 /* DeckLink mode information */

51 IDeckLinkDisplayModeIterator *itermode;

52 BMDTimeValue bmd_tb_den;

53 BMDTimeValue bmd_tb_num;

54 BMDDisplayMode bmd_mode;

55 int bmd_width;

56 int bmd_height;

58 /* Streams present */

59 int audio;

60 int video;

62 /* Status */

63 int playback_started;

64 int64_t last_pts;

66 /* Options */

67 int list_devices;

68 int list_formats;

69 double preroll;

71 int frames_preroll;

72 int frames_buffer;

74 sem_t semaphore;

76 int channels;

77 };

79 /* DeckLink callback class declaration */

80 class decklink_frame : public IDeckLinkVideoFrame

81 {

82 public:

83 decklink_frame(struct decklink_ctx *ctx, AVFrame *avframe, long width,

84 long height, void *buffer) :

85 _ctx(ctx), _avframe(avframe), _width(width),

86 _height(height), _buffer(buffer), _refs(0) { }

88 virtual long STDMETHODCALLTYPE GetWidth (void) { return _width; }

89 virtual long STDMETHODCALLTYPE GetHeight (void) { return _height; }

90 virtual long STDMETHODCALLTYPE GetRowBytes (void) { return _width<<1; }

91 virtual BMDPixelFormat STDMETHODCALLTYPE GetPixelFormat(void) { return bmdFormat8BitYUV; }

92 virtual BMDFrameFlags STDMETHODCALLTYPE GetFlags (void) { return bmdVideoOutputFlagDefault; }

93 virtual HRESULT STDMETHODCALLTYPE GetBytes (void **buffer) { *buffer = _buffer; return S_OK; }

95 virtual HRESULT STDMETHODCALLTYPE GetTimecode (BMDTimecodeFormat format, IDeckLinkTimecode **timecode) { return S_FALSE; }

96 virtual HRESULT STDMETHODCALLTYPE GetAncillaryData(IDeckLinkVideoFrameAncillary **ancillary) { return S_FALSE; }

98 virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }

99 virtual ULONG STDMETHODCALLTYPE AddRef(void) { return ++_refs; }

100 virtual ULONG STDMETHODCALLTYPE Release(void) { if (!--_refs) delete this; return _refs; }

101

102 struct decklink_ctx *_ctx;

103 AVFrame *_avframe;

104

105 private:

106 long _width;

107 long _height;

108 void *_buffer;

109 int _refs;

110 };

111

112 class decklink_callback : public IDeckLinkVideoOutputCallback

113 {

114 public:

115 virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame *_frame, BMDOutputFrameCompletionResult result)

116 {

117 decklink_frame *frame = static_cast<decklink_frame *>(_frame);

118 struct decklink_ctx *ctx = frame->_ctx;

119 AVFrame *avframe = frame->_avframe;

120

121 av_frame_free(&avframe);

122

123 sem_post(&ctx->semaphore);

124

125 return S_OK;

126 }

127 virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped(void) { return S_OK; }

128 virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }

129 virtual ULONG STDMETHODCALLTYPE AddRef(void) { return 1; }

130 virtual ULONG STDMETHODCALLTYPE Release(void) { return 1; }

131 };

132

133 #ifdef _WIN32

134 static IDeckLinkIterator *CreateDeckLinkIteratorInstance(void)

135 {

136 IDeckLinkIterator *iter;

137

138 if (CoInitialize(NULL) != S_OK) {

139 av_log(NULL, AV_LOG_ERROR, "COM initialization failed.\n");

140 return NULL;

141 }

142

143 if (CoCreateInstance(CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL,

144 IID_IDeckLinkIterator, (void**) &iter) != S_OK) {

145 av_log(NULL, AV_LOG_ERROR, "DeckLink drivers not installed.\n");

146 return NULL;

147 }

148

149 return iter;

150 }

151 #endif

152

153 /* free() is needed for a string returned by the DeckLink SDL. */

154 #undef free

155

156 #ifdef _WIN32

157 static char *dup_wchar_to_utf8(wchar_t *w)

158 {

159 char *s = NULL;

160 int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);

161 s = (char *) av_malloc(l);

162 if (s)

163 WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);

164 return s;

165 }

166 #define DECKLINK_STR OLECHAR *

167 #define DECKLINK_STRDUP dup_wchar_to_utf8

168 #else

169 #define DECKLINK_STR const char *

170 #define DECKLINK_STRDUP av_strdup

171 #endif

172

173 static HRESULT IDeckLink_GetDisplayName(IDeckLink *This, const char **displayName)

174 {

175 DECKLINK_STR tmpDisplayName;

176 HRESULT hr = This->GetDisplayName(&tmpDisplayName);

177 if (hr != S_OK)

178 return hr;

179 *displayName = DECKLINK_STRDUP(tmpDisplayName);

180 free((void *) tmpDisplayName);

181 return hr;

182 }

183

184 static int decklink_set_format(struct decklink_ctx *ctx,

185 int width, int height,

186 int tb_num, int tb_den)

187 {

188 BMDDisplayModeSupport support;

189 IDeckLinkDisplayMode *mode;

190

191 if (tb_num == 1) {

192 tb_num *= 1000;

193 tb_den *= 1000;

194 }

195 ctx->bmd_mode = bmdModeUnknown;

196 while ((ctx->bmd_mode == bmdModeUnknown) && ctx->itermode->Next(&mode) == S_OK) {

197 BMDTimeValue bmd_tb_num, bmd_tb_den;

198 int bmd_width = mode->GetWidth();

199 int bmd_height = mode->GetHeight();

200

201 mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);

202

203 if (bmd_width == width && bmd_height == height &&

204 bmd_tb_num == tb_num && bmd_tb_den == tb_den) {

205 ctx->bmd_mode = mode->GetDisplayMode();

206 ctx->bmd_width = bmd_width;

207 ctx->bmd_height = bmd_height;

208 ctx->bmd_tb_den = bmd_tb_den;

209 ctx->bmd_tb_num = bmd_tb_num;

210 }

211

212 mode->Release();

213 }

214 if (ctx->bmd_mode == bmdModeUnknown)

215 return -1;

216 if (ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,

217 bmdVideoOutputFlagDefault,

218 &support, NULL) != S_OK)

219 return -1;

220 if (support == bmdDisplayModeSupported)

221 return 0;

222

223 return -1;

224 }

225

226 static int decklink_setup_video(AVFormatContext *avctx, AVStream *st)

227 {

228 struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

229 struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;

230 AVCodecContext *c = st->codec;

231

232 if (ctx->video) {

233 av_log(avctx, AV_LOG_ERROR, "Only one video stream is supported!\n");

234 return -1;

235 }

236

237 if (c->pix_fmt != AV_PIX_FMT_UYVY422) {

238 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format!"

239 " Only AV_PIX_FMT_UYVY422 is supported.\n");

240 return -1;

241 }

242 if (decklink_set_format(ctx, c->width, c->height,

243 c->time_base.num, c->time_base.den)) {

244 av_log(avctx, AV_LOG_ERROR, "Unsupported video size or framerate!"

245 " Check available formats with -list_formats 1.\n");

246 return -1;

247 }

248 if (ctx->dlo->EnableVideoOutput(ctx->bmd_mode,

249 bmdVideoOutputFlagDefault) != S_OK) {

250 av_log(avctx, AV_LOG_ERROR, "Could not enable video output!\n");

251 return -1;

252 }

253

254 /* Set callback. */

255 ctx->callback = new decklink_callback();

256 ctx->dlo->SetScheduledFrameCompletionCallback(ctx->callback);

257

258 /* Start video semaphore. */

259 ctx->frames_preroll = c->time_base.den * ctx->preroll;

260 if (c->time_base.den > 1000)

261 ctx->frames_preroll /= 1000;

262

263 /* Buffer twice as many frames as the preroll. */

264 ctx->frames_buffer = ctx->frames_preroll * 2;

265 ctx->frames_buffer = FFMIN(ctx->frames_buffer, 60);

266 sem_init(&ctx->semaphore, 0, ctx->frames_buffer);

267

268 /* The device expects the framerate to be fixed. */

269 avpriv_set_pts_info(st, 64, c->time_base.num, c->time_base.den);

270

271 ctx->video = 1;

272

273 return 0;

274 }

275

276 static int decklink_setup_audio(AVFormatContext *avctx, AVStream *st)

277 {

278 struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

279 struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;

280 AVCodecContext *c = st->codec;

281

282 if (ctx->audio) {

283 av_log(avctx, AV_LOG_ERROR, "Only one audio stream is supported!\n");

284 return -1;

285 }

286 if (c->sample_rate != 48000) {

287 av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate!"

288 " Only 48kHz is supported.\n");

289 return -1;

290 }

291 if (c->channels != 2 && c->channels != 8) {

292 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels!"

293 " Only stereo and 7.1 are supported.\n");

294 return -1;

295 }

296 if (ctx->dlo->EnableAudioOutput(bmdAudioSampleRate48kHz,

297 bmdAudioSampleType16bitInteger,

298 c->channels,

299 bmdAudioOutputStreamTimestamped) != S_OK) {

300 av_log(avctx, AV_LOG_ERROR, "Could not enable audio output!\n");

301 return -1;

302 }

303 if (ctx->dlo->BeginAudioPreroll() != S_OK) {

304 av_log(avctx, AV_LOG_ERROR, "Could not begin audio preroll!\n");

305 return -1;

306 }

307

308 /* The device expects the sample rate to be fixed. */

309 avpriv_set_pts_info(st, 64, 1, c->sample_rate);

310 ctx->channels = c->channels;

311

312 ctx->audio = 1;

313

314 return 0;

315 }

316

317 av_cold int ff_decklink_write_trailer(AVFormatContext *avctx)

318 {

319 struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

320 struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;

321

322 if (ctx->playback_started) {

323 BMDTimeValue actual;

324 ctx->dlo->StopScheduledPlayback(ctx->last_pts * ctx->bmd_tb_num,

325 &actual, ctx->bmd_tb_den);

326 ctx->dlo->DisableVideoOutput();

327 if (ctx->audio)

328 ctx->dlo->DisableAudioOutput();

329 }

330

331 if (ctx->dlo)

332 ctx->dlo->Release();

333 if (ctx->dl)

334 ctx->dl->Release();

335

336 if (ctx->callback)

337 delete ctx->callback;

338

339 sem_destroy(&ctx->semaphore);

340

341 av_freep(&cctx->ctx);

342

343 return 0;

344 }

345

346 static int decklink_write_video_packet(AVFormatContext *avctx, AVPacket *pkt)

347 {

348 struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

349 struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;

350 AVPicture *avpicture = (AVPicture *) pkt->data;

351 AVFrame *avframe, *tmp;

352 decklink_frame *frame;

353 buffercount_type buffered;

354 HRESULT hr;

355

356 /* HACK while av_uncoded_frame() isn't implemented */

357 int ret;

358

359 tmp = av_frame_alloc();

360 if (!tmp)

361 return AVERROR(ENOMEM);

362 tmp->format = AV_PIX_FMT_UYVY422;

363 tmp->width = ctx->bmd_width;

364 tmp->height = ctx->bmd_height;

365 ret = av_frame_get_buffer(tmp, 32);

366 if (ret < 0) {

367 av_frame_free(&tmp);

368 return ret;

369 }

370 av_image_copy(tmp->data, tmp->linesize, (const uint8_t **) avpicture->data,

371 avpicture->linesize, (AVPixelFormat) tmp->format, tmp->width,

372 tmp->height);

373 avframe = av_frame_clone(tmp);

374 av_frame_free(&tmp);

375 if (!avframe) {

376 av_log(avctx, AV_LOG_ERROR, "Could not clone video frame.\n");

377 return AVERROR(EIO);

378 }

379 /* end HACK */

380

381 frame = new decklink_frame(ctx, avframe, ctx->bmd_width, ctx->bmd_height,

382 (void *) avframe->data[0]);

383 if (!frame) {

384 av_log(avctx, AV_LOG_ERROR, "Could not create new frame.\n");

385 return AVERROR(EIO);

386 }

387

388 /* Always keep at most one second of frames buffered. */

389 sem_wait(&ctx->semaphore);

390

391 /* Schedule frame for playback. */

392 hr = ctx->dlo->ScheduleVideoFrame((struct IDeckLinkVideoFrame *) frame,

393 pkt->pts * ctx->bmd_tb_num,

394 ctx->bmd_tb_num, ctx->bmd_tb_den);

395 if (hr != S_OK) {

396 av_log(avctx, AV_LOG_ERROR, "Could not schedule video frame."

397 " error %08x.\n", (uint32_t) hr);

398 frame->Release();

399 return AVERROR(EIO);

400 }

401

402 ctx->dlo->GetBufferedVideoFrameCount(&buffered);

403 av_log(avctx, AV_LOG_DEBUG, "Buffered video frames: %d.\n", (int) buffered);

404 if (pkt->pts > 2 && buffered <= 2)

405 av_log(avctx, AV_LOG_WARNING, "There are not enough buffered video frames."

406 " Video may misbehave!\n");

407

408 /* Preroll video frames. */

409 if (!ctx->playback_started && pkt->pts > ctx->frames_preroll) {

410 av_log(avctx, AV_LOG_DEBUG, "Ending audio preroll.\n");

411 if (ctx->audio && ctx->dlo->EndAudioPreroll() != S_OK) {

412 av_log(avctx, AV_LOG_ERROR, "Could not end audio preroll!\n");

413 return AVERROR(EIO);

414 }

415 av_log(avctx, AV_LOG_DEBUG, "Starting scheduled playback.\n");

416 if (ctx->dlo->StartScheduledPlayback(0, ctx->bmd_tb_den, 1.0) != S_OK) {

417 av_log(avctx, AV_LOG_ERROR, "Could not start scheduled playback!\n");

418 return AVERROR(EIO);

419 }

420 ctx->playback_started = 1;

421 }

422

423 return 0;

424 }

425

426 static int decklink_write_audio_packet(AVFormatContext *avctx, AVPacket *pkt)

427 {

428 struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

429 struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;

430 int sample_count = pkt->size / (ctx->channels << 1);

431 buffercount_type buffered;

432

433 ctx->dlo->GetBufferedAudioSampleFrameCount(&buffered);

434 if (pkt->pts > 1 && !buffered)

435 av_log(avctx, AV_LOG_WARNING, "There's no buffered audio."

436 " Audio will misbehave!\n");

437

438 if (ctx->dlo->ScheduleAudioSamples(pkt->data, sample_count, pkt->pts,

439 bmdAudioSampleRate48kHz, NULL) != S_OK) {

440 av_log(avctx, AV_LOG_ERROR, "Could not schedule audio samples.\n");

441 return AVERROR(EIO);

442 }

443

444 return 0;

445 }

446

447 extern "C" {

448

449 av_cold int ff_decklink_write_header(AVFormatContext *avctx)

450 {

451 struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

452 struct decklink_ctx *ctx;

453 IDeckLinkIterator *iter;

454 IDeckLink *dl = NULL;

455 unsigned int n;

456

457 ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));

458 if (!ctx)

459 return AVERROR(ENOMEM);

460 ctx->list_devices = cctx->list_devices;

461 ctx->list_formats = cctx->list_formats;

462 ctx->preroll = cctx->preroll;

463 cctx->ctx = ctx;

464

465 iter = CreateDeckLinkIteratorInstance();

466 if (!iter) {

467 av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n");

468 return AVERROR(EIO);

469 }

470

471 /* List available devices. */

472 if (ctx->list_devices) {

473 av_log(avctx, AV_LOG_INFO, "Blackmagic DeckLink devices:\n");

474 while (iter->Next(&dl) == S_OK) {

475 const char *displayName;

476 IDeckLink_GetDisplayName(dl, &displayName);

477 av_log(avctx, AV_LOG_INFO, "\t'%s'\n", displayName);

478 av_free((void *) displayName);

479 dl->Release();

480 }

481 iter->Release();

482 return AVERROR_EXIT;

483 }

484

485 /* Open device. */

486 while (iter->Next(&dl) == S_OK) {

487 const char *displayName;

488 IDeckLink_GetDisplayName(dl, &displayName);

489 if (!strcmp(avctx->filename, displayName)) {

490 av_free((void *) displayName);

491 ctx->dl = dl;

492 break;

493 }

494 av_free((void *) displayName);

495 dl->Release();

496 }

497 iter->Release();

498 if (!ctx->dl) {

499 av_log(avctx, AV_LOG_ERROR, "Could not open '%s'\n", avctx->filename);

500 return AVERROR(EIO);

501 }

502

503 /* Get output device. */

504 if (ctx->dl->QueryInterface(IID_IDeckLinkOutput, (void **) &ctx->dlo) != S_OK) {

505 av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",

506 avctx->filename);

507 ctx->dl->Release();

508 return AVERROR(EIO);

509 }

510

511 if (ctx->dlo->GetDisplayModeIterator(&ctx->itermode) != S_OK) {

512 av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");

513 ctx->dl->Release();

514 return AVERROR(EIO);

515 }

516

517 /* List supported formats. */

518 if (ctx->list_formats) {

519 IDeckLinkDisplayMode *mode;

520

521 av_log(avctx, AV_LOG_INFO, "Supported formats for '%s':\n",

522 avctx->filename);

523 while (ctx->itermode->Next(&mode) == S_OK) {

524 BMDTimeValue tb_num, tb_den;

525 mode->GetFrameRate(&tb_num, &tb_den);

526 av_log(avctx, AV_LOG_INFO, "\t%ldx%ld at %d/%d fps",

527 mode->GetWidth(), mode->GetHeight(),

528 (int) tb_den, (int) tb_num);

529 switch (mode->GetFieldDominance()) {

530 case bmdLowerFieldFirst:

531 av_log(avctx, AV_LOG_INFO, " (interlaced, lower field first)"); break;

532 case bmdUpperFieldFirst:

533 av_log(avctx, AV_LOG_INFO, " (interlaced, upper field first)"); break;

534 }

535 av_log(avctx, AV_LOG_INFO, "\n");

536 mode->Release();

537 }

538

539 ctx->itermode->Release();

540 ctx->dlo->Release();

541 ctx->dl->Release();

542 return AVERROR_EXIT;

543 }

544

545 /* Setup streams. */

546 for (n = 0; n < avctx->nb_streams; n++) {

547 AVStream *st = avctx->streams[n];

548 AVCodecContext *c = st->codec;

549 if (c->codec_type == AVMEDIA_TYPE_AUDIO) {

550 if (decklink_setup_audio(avctx, st))

551 goto error;

552 } else if (c->codec_type == AVMEDIA_TYPE_VIDEO) {

553 if (decklink_setup_video(avctx, st))

554 goto error;

555 } else {

556 av_log(avctx, AV_LOG_ERROR, "Unsupported stream type.\n");

557 goto error;

558 }

559 }

560 ctx->itermode->Release();

561

562 return 0;

563

564 error:

565

566 ctx->dlo->Release();

567 ctx->dl->Release();

568

569 return AVERROR(EIO);

570 }

571

572 int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt)

573 {

574 struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

575 struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;

576 AVStream *st = avctx->streams[pkt->stream_index];

577

578 ctx->last_pts = FFMAX(ctx->last_pts, pkt->pts);

579

580 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)

581 return decklink_write_video_packet(avctx, pkt);

582 else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

583 return decklink_write_audio_packet(avctx, pkt);

584

585 return AVERROR(EIO);

586 }

587

588 } /* extern "C" */

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