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path: root/libavdevice/decklink_enc.cpp (plain)
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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 <atomic>
23using std::atomic;
24
25#include <DeckLinkAPI.h>
26
27#include <pthread.h>
28#include <semaphore.h>
29
30extern "C" {
31#include "libavformat/avformat.h"
32#include "libavformat/internal.h"
33#include "libavutil/imgutils.h"
34}
35
36#include "decklink_common.h"
37#include "decklink_enc.h"
38
39
40/* DeckLink callback class declaration */
41class decklink_frame : public IDeckLinkVideoFrame
42{
43public:
44 decklink_frame(struct decklink_ctx *ctx, AVFrame *avframe) :
45 _ctx(ctx), _avframe(avframe), _refs(1) { }
46
47 virtual long STDMETHODCALLTYPE GetWidth (void) { return _avframe->width; }
48 virtual long STDMETHODCALLTYPE GetHeight (void) { return _avframe->height; }
49 virtual long STDMETHODCALLTYPE GetRowBytes (void) { return _avframe->linesize[0] < 0 ? -_avframe->linesize[0] : _avframe->linesize[0]; }
50 virtual BMDPixelFormat STDMETHODCALLTYPE GetPixelFormat(void) { return bmdFormat8BitYUV; }
51 virtual BMDFrameFlags STDMETHODCALLTYPE GetFlags (void) { return _avframe->linesize[0] < 0 ? bmdFrameFlagFlipVertical : bmdFrameFlagDefault; }
52 virtual HRESULT STDMETHODCALLTYPE GetBytes (void **buffer)
53 {
54 if (_avframe->linesize[0] < 0)
55 *buffer = (void *)(_avframe->data[0] + _avframe->linesize[0] * (_avframe->height - 1));
56 else
57 *buffer = (void *)(_avframe->data[0]);
58 return S_OK;
59 }
60
61 virtual HRESULT STDMETHODCALLTYPE GetTimecode (BMDTimecodeFormat format, IDeckLinkTimecode **timecode) { return S_FALSE; }
62 virtual HRESULT STDMETHODCALLTYPE GetAncillaryData(IDeckLinkVideoFrameAncillary **ancillary) { return S_FALSE; }
63
64 virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
65 virtual ULONG STDMETHODCALLTYPE AddRef(void) { return ++_refs; }
66 virtual ULONG STDMETHODCALLTYPE Release(void)
67 {
68 int ret = --_refs;
69 if (!ret) {
70 av_frame_free(&_avframe);
71 delete this;
72 }
73 return ret;
74 }
75
76 struct decklink_ctx *_ctx;
77 AVFrame *_avframe;
78
79private:
80 std::atomic<int> _refs;
81};
82
83class decklink_output_callback : public IDeckLinkVideoOutputCallback
84{
85public:
86 virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame *_frame, BMDOutputFrameCompletionResult result)
87 {
88 decklink_frame *frame = static_cast<decklink_frame *>(_frame);
89 struct decklink_ctx *ctx = frame->_ctx;
90 AVFrame *avframe = frame->_avframe;
91
92 av_frame_unref(avframe);
93
94 sem_post(&ctx->semaphore);
95
96 return S_OK;
97 }
98 virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped(void) { return S_OK; }
99 virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
100 virtual ULONG STDMETHODCALLTYPE AddRef(void) { return 1; }
101 virtual ULONG STDMETHODCALLTYPE Release(void) { return 1; }
102};
103
104static int decklink_setup_video(AVFormatContext *avctx, AVStream *st)
105{
106 struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
107 struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
108 AVCodecParameters *c = st->codecpar;
109
110 if (ctx->video) {
111 av_log(avctx, AV_LOG_ERROR, "Only one video stream is supported!\n");
112 return -1;
113 }
114
115 if (c->format != AV_PIX_FMT_UYVY422) {
116 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format!"
117 " Only AV_PIX_FMT_UYVY422 is supported.\n");
118 return -1;
119 }
120 if (ff_decklink_set_format(avctx, c->width, c->height,
121 st->time_base.num, st->time_base.den, c->field_order)) {
122 av_log(avctx, AV_LOG_ERROR, "Unsupported video size, framerate or field order!"
123 " Check available formats with -list_formats 1.\n");
124 return -1;
125 }
126 if (ctx->dlo->EnableVideoOutput(ctx->bmd_mode,
127 bmdVideoOutputFlagDefault) != S_OK) {
128 av_log(avctx, AV_LOG_ERROR, "Could not enable video output!\n");
129 return -1;
130 }
131
132 /* Set callback. */
133 ctx->output_callback = new decklink_output_callback();
134 ctx->dlo->SetScheduledFrameCompletionCallback(ctx->output_callback);
135
136 /* Start video semaphore. */
137 ctx->frames_preroll = st->time_base.den * ctx->preroll;
138 if (st->time_base.den > 1000)
139 ctx->frames_preroll /= 1000;
140
141 /* Buffer twice as many frames as the preroll. */
142 ctx->frames_buffer = ctx->frames_preroll * 2;
143 ctx->frames_buffer = FFMIN(ctx->frames_buffer, 60);
144 sem_init(&ctx->semaphore, 0, ctx->frames_buffer);
145
146 /* The device expects the framerate to be fixed. */
147 avpriv_set_pts_info(st, 64, st->time_base.num, st->time_base.den);
148
149 ctx->video = 1;
150
151 return 0;
152}
153
154static int decklink_setup_audio(AVFormatContext *avctx, AVStream *st)
155{
156 struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
157 struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
158 AVCodecParameters *c = st->codecpar;
159
160 if (ctx->audio) {
161 av_log(avctx, AV_LOG_ERROR, "Only one audio stream is supported!\n");
162 return -1;
163 }
164 if (c->sample_rate != 48000) {
165 av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate!"
166 " Only 48kHz is supported.\n");
167 return -1;
168 }
169 if (c->channels != 2 && c->channels != 8) {
170 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels!"
171 " Only stereo and 7.1 are supported.\n");
172 return -1;
173 }
174 if (ctx->dlo->EnableAudioOutput(bmdAudioSampleRate48kHz,
175 bmdAudioSampleType16bitInteger,
176 c->channels,
177 bmdAudioOutputStreamTimestamped) != S_OK) {
178 av_log(avctx, AV_LOG_ERROR, "Could not enable audio output!\n");
179 return -1;
180 }
181 if (ctx->dlo->BeginAudioPreroll() != S_OK) {
182 av_log(avctx, AV_LOG_ERROR, "Could not begin audio preroll!\n");
183 return -1;
184 }
185
186 /* The device expects the sample rate to be fixed. */
187 avpriv_set_pts_info(st, 64, 1, c->sample_rate);
188 ctx->channels = c->channels;
189
190 ctx->audio = 1;
191
192 return 0;
193}
194
195av_cold int ff_decklink_write_trailer(AVFormatContext *avctx)
196{
197 struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
198 struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
199
200 if (ctx->playback_started) {
201 BMDTimeValue actual;
202 ctx->dlo->StopScheduledPlayback(ctx->last_pts * ctx->bmd_tb_num,
203 &actual, ctx->bmd_tb_den);
204 ctx->dlo->DisableVideoOutput();
205 if (ctx->audio)
206 ctx->dlo->DisableAudioOutput();
207 }
208
209 ff_decklink_cleanup(avctx);
210
211 if (ctx->output_callback)
212 delete ctx->output_callback;
213
214 sem_destroy(&ctx->semaphore);
215
216 av_freep(&cctx->ctx);
217
218 return 0;
219}
220
221static int decklink_write_video_packet(AVFormatContext *avctx, AVPacket *pkt)
222{
223 struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
224 struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
225 AVFrame *avframe, *tmp = (AVFrame *)pkt->data;
226 decklink_frame *frame;
227 buffercount_type buffered;
228 HRESULT hr;
229
230 if (tmp->format != AV_PIX_FMT_UYVY422 ||
231 tmp->width != ctx->bmd_width ||
232 tmp->height != ctx->bmd_height) {
233 av_log(avctx, AV_LOG_ERROR, "Got a frame with invalid pixel format or dimension.\n");
234 return AVERROR(EINVAL);
235 }
236 avframe = av_frame_clone(tmp);
237 if (!avframe) {
238 av_log(avctx, AV_LOG_ERROR, "Could not clone video frame.\n");
239 return AVERROR(EIO);
240 }
241
242 frame = new decklink_frame(ctx, avframe);
243 if (!frame) {
244 av_log(avctx, AV_LOG_ERROR, "Could not create new frame.\n");
245 av_frame_free(&avframe);
246 return AVERROR(EIO);
247 }
248
249 /* Always keep at most one second of frames buffered. */
250 sem_wait(&ctx->semaphore);
251
252 /* Schedule frame for playback. */
253 hr = ctx->dlo->ScheduleVideoFrame((struct IDeckLinkVideoFrame *) frame,
254 pkt->pts * ctx->bmd_tb_num,
255 ctx->bmd_tb_num, ctx->bmd_tb_den);
256 /* Pass ownership to DeckLink, or release on failure */
257 frame->Release();
258 if (hr != S_OK) {
259 av_log(avctx, AV_LOG_ERROR, "Could not schedule video frame."
260 " error %08x.\n", (uint32_t) hr);
261 return AVERROR(EIO);
262 }
263
264 ctx->dlo->GetBufferedVideoFrameCount(&buffered);
265 av_log(avctx, AV_LOG_DEBUG, "Buffered video frames: %d.\n", (int) buffered);
266 if (pkt->pts > 2 && buffered <= 2)
267 av_log(avctx, AV_LOG_WARNING, "There are not enough buffered video frames."
268 " Video may misbehave!\n");
269
270 /* Preroll video frames. */
271 if (!ctx->playback_started && pkt->pts > ctx->frames_preroll) {
272 av_log(avctx, AV_LOG_DEBUG, "Ending audio preroll.\n");
273 if (ctx->audio && ctx->dlo->EndAudioPreroll() != S_OK) {
274 av_log(avctx, AV_LOG_ERROR, "Could not end audio preroll!\n");
275 return AVERROR(EIO);
276 }
277 av_log(avctx, AV_LOG_DEBUG, "Starting scheduled playback.\n");
278 if (ctx->dlo->StartScheduledPlayback(0, ctx->bmd_tb_den, 1.0) != S_OK) {
279 av_log(avctx, AV_LOG_ERROR, "Could not start scheduled playback!\n");
280 return AVERROR(EIO);
281 }
282 ctx->playback_started = 1;
283 }
284
285 return 0;
286}
287
288static int decklink_write_audio_packet(AVFormatContext *avctx, AVPacket *pkt)
289{
290 struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
291 struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
292 int sample_count = pkt->size / (ctx->channels << 1);
293 buffercount_type buffered;
294
295 ctx->dlo->GetBufferedAudioSampleFrameCount(&buffered);
296 if (pkt->pts > 1 && !buffered)
297 av_log(avctx, AV_LOG_WARNING, "There's no buffered audio."
298 " Audio will misbehave!\n");
299
300 if (ctx->dlo->ScheduleAudioSamples(pkt->data, sample_count, pkt->pts,
301 bmdAudioSampleRate48kHz, NULL) != S_OK) {
302 av_log(avctx, AV_LOG_ERROR, "Could not schedule audio samples.\n");
303 return AVERROR(EIO);
304 }
305
306 return 0;
307}
308
309extern "C" {
310
311av_cold int ff_decklink_write_header(AVFormatContext *avctx)
312{
313 struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
314 struct decklink_ctx *ctx;
315 unsigned int n;
316 int ret;
317
318 ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
319 if (!ctx)
320 return AVERROR(ENOMEM);
321 ctx->list_devices = cctx->list_devices;
322 ctx->list_formats = cctx->list_formats;
323 ctx->preroll = cctx->preroll;
324 cctx->ctx = ctx;
325
326 /* List available devices. */
327 if (ctx->list_devices) {
328 ff_decklink_list_devices(avctx);
329 return AVERROR_EXIT;
330 }
331
332 ret = ff_decklink_init_device(avctx, avctx->filename);
333 if (ret < 0)
334 return ret;
335
336 /* Get output device. */
337 if (ctx->dl->QueryInterface(IID_IDeckLinkOutput, (void **) &ctx->dlo) != S_OK) {
338 av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",
339 avctx->filename);
340 ret = AVERROR(EIO);
341 goto error;
342 }
343
344 /* List supported formats. */
345 if (ctx->list_formats) {
346 ff_decklink_list_formats(avctx);
347 ret = AVERROR_EXIT;
348 goto error;
349 }
350
351 /* Setup streams. */
352 ret = AVERROR(EIO);
353 for (n = 0; n < avctx->nb_streams; n++) {
354 AVStream *st = avctx->streams[n];
355 AVCodecParameters *c = st->codecpar;
356 if (c->codec_type == AVMEDIA_TYPE_AUDIO) {
357 if (decklink_setup_audio(avctx, st))
358 goto error;
359 } else if (c->codec_type == AVMEDIA_TYPE_VIDEO) {
360 if (decklink_setup_video(avctx, st))
361 goto error;
362 } else {
363 av_log(avctx, AV_LOG_ERROR, "Unsupported stream type.\n");
364 goto error;
365 }
366 }
367
368 return 0;
369
370error:
371 ff_decklink_cleanup(avctx);
372 return ret;
373}
374
375int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt)
376{
377 struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
378 struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
379 AVStream *st = avctx->streams[pkt->stream_index];
380
381 ctx->last_pts = FFMAX(ctx->last_pts, pkt->pts);
382
383 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
384 return decklink_write_video_packet(avctx, pkt);
385 else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
386 return decklink_write_audio_packet(avctx, pkt);
387
388 return AVERROR(EIO);
389}
390
391} /* extern "C" */
392
generated by cgit at 2024-05-18 08:38:32 (GMT)