FFmpeg: libavfilter/buffersrc.c Source File

79 av_log(s, AV_LOG_INFO, "filter context - fmt: %s r: %d layout: %"PRIX64" ch: %d, incoming frame - fmt: %s r: %d layout: %"PRIX64" ch: %d pts_time: %s\n",\

80 av_get_sample_fmt_name(c->sample_fmt), c->sample_rate, c->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ? c->ch_layout.u.mask : 0, c->channels,\

81 av_get_sample_fmt_name(format), srate, layout.order == AV_CHANNEL_ORDER_NATIVE ? layout.u.mask : 0, layout.nb_channels, av_ts2timestr(pts, &s->outputs[0]->time_base));\

82 av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\

83 return AVERROR(EINVAL);\

84 }

86 AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)

87 {

88 AVBufferSrcParameters *par = av_mallocz(sizeof(*par));

89 if (!par)

90 return NULL;

92 par->format = -1;

94 return par;

95 }

97 int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)

98 {

99 BufferSourceContext *s = ctx->priv;

100

101 if (param->time_base.num > 0 && param->time_base.den > 0)

102 s->time_base = param->time_base;

103

104 switch (ctx->filter->outputs[0].type) {

105 case AVMEDIA_TYPE_VIDEO:

106 if (param->format != AV_PIX_FMT_NONE) {

107 s->pix_fmt = param->format;

108 }

109 if (param->width > 0)

110 s->w = param->width;

111 if (param->height > 0)

112 s->h = param->height;

113 if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)

114 s->pixel_aspect = param->sample_aspect_ratio;

115 if (param->frame_rate.num > 0 && param->frame_rate.den > 0)

116 s->frame_rate = param->frame_rate;

117 if (param->hw_frames_ctx) {

118 av_buffer_unref(&s->hw_frames_ctx);

119 s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);

120 if (!s->hw_frames_ctx)

121 return AVERROR(ENOMEM);

122 }

123 break;

124 case AVMEDIA_TYPE_AUDIO:

125 if (param->format != AV_SAMPLE_FMT_NONE) {

126 s->sample_fmt = param->format;

127 }

128 if (param->sample_rate > 0)

129 s->sample_rate = param->sample_rate;

130 #if FF_API_OLD_CHANNEL_LAYOUT

131 FF_DISABLE_DEPRECATION_WARNINGS

132 // if the old/new fields are set inconsistently, prefer the old ones

133 if (param->channel_layout && (param->ch_layout.order != AV_CHANNEL_ORDER_NATIVE ||

134 param->ch_layout.u.mask != param->channel_layout)) {

135 av_channel_layout_uninit(&s->ch_layout);

136 av_channel_layout_from_mask(&s->ch_layout, param->channel_layout);

137 FF_ENABLE_DEPRECATION_WARNINGS

138 } else

139 #endif

140 if (param->ch_layout.nb_channels) {

141 int ret = av_channel_layout_copy(&s->ch_layout, &param->ch_layout);

142 if (ret < 0)

143 return ret;

144 }

145 break;

146 default:

147 return AVERROR_BUG;

148 }

149

150 return 0;

151 }

152

153 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)

154 {

155 return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,

156 AV_BUFFERSRC_FLAG_KEEP_REF);

157 }

158

159 int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)

160 {

161 return av_buffersrc_add_frame_flags(ctx, frame, 0);

162 }

163

164 static int push_frame(AVFilterGraph *graph)

165 {

166 int ret;

167

168 while (1) {

169 ret = ff_filter_graph_run_once(graph);

170 if (ret == AVERROR(EAGAIN))

171 break;

172 if (ret < 0)

173 return ret;

174 }

175 return 0;

176 }

177

178 int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)

179 {

180 BufferSourceContext *s = ctx->priv;

181 AVFrame *copy;

182 int refcounted, ret;

183

184 #if FF_API_OLD_CHANNEL_LAYOUT

185 FF_DISABLE_DEPRECATION_WARNINGS

186 if (frame && frame->channel_layout &&

187 av_get_channel_layout_nb_channels(frame->channel_layout) != frame->channels) {

188 av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");

189 return AVERROR(EINVAL);

190 }

191 FF_ENABLE_DEPRECATION_WARNINGS

192 #endif

193

194 s->nb_failed_requests = 0;

195

196 if (!frame)

197 return av_buffersrc_close(ctx, AV_NOPTS_VALUE, flags);

198 if (s->eof)

199 return AVERROR(EINVAL);

200

201 refcounted = !!frame->buf[0];

202

203 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {

204

205 switch (ctx->outputs[0]->type) {

206 case AVMEDIA_TYPE_VIDEO:

207 CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,

208 frame->format, frame->pts);

209 break;

210 case AVMEDIA_TYPE_AUDIO:

211 /* For layouts unknown on input but known on link after negotiation. */

212 #if FF_API_OLD_CHANNEL_LAYOUT

213 FF_DISABLE_DEPRECATION_WARNINGS

214 if (!frame->channel_layout)

215 frame->channel_layout = s->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?

216 s->ch_layout.u.mask : 0;

217 FF_ENABLE_DEPRECATION_WARNINGS

218 #endif

219 if (frame->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {

220 ret = av_channel_layout_copy(&frame->ch_layout, &s->ch_layout);

221 if (ret < 0)

222 return ret;

223 }

224 CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->ch_layout,

225 frame->format, frame->pts);

226 break;

227 default:

228 return AVERROR(EINVAL);

229 }

230

231 }

232

233 if (!(copy = av_frame_alloc()))

234 return AVERROR(ENOMEM);

235

236 if (refcounted && !(flags & AV_BUFFERSRC_FLAG_KEEP_REF)) {

237 av_frame_move_ref(copy, frame);

238 } else {

239 ret = av_frame_ref(copy, frame);

240 if (ret < 0) {

241 av_frame_free(&copy);

242 return ret;

243 }

244 }

245

246 ret = ff_filter_frame(ctx->outputs[0], copy);

247 if (ret < 0)

248 return ret;

249

250 if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {

251 ret = push_frame(ctx->graph);

252 if (ret < 0)

253 return ret;

254 }

255

256 return 0;

257 }

258

259 int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)

260 {

261 BufferSourceContext *s = ctx->priv;

262

263 s->eof = 1;

264 ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, pts);

265 return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;

266 }

267

268 static av_cold int init_video(AVFilterContext *ctx)

269 {

270 BufferSourceContext *c = ctx->priv;

271

272 if (c->pix_fmt == AV_PIX_FMT_NONE || !c->w || !c->h ||

273 av_q2d(c->time_base) <= 0) {

274 av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");

275 return AVERROR(EINVAL);

276 }

277

278 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d\n",

279 c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),

280 c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,

281 c->pixel_aspect.num, c->pixel_aspect.den);

282

283 #if FF_API_SWS_PARAM_OPTION

284 if (c->sws_param)

285 av_log(ctx, AV_LOG_WARNING, "sws_param option is deprecated and ignored\n");

286 #endif

287

288 return 0;

289 }

290

291 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)

292 {

293 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;

294 }

295

296 #define OFFSET(x) offsetof(BufferSourceContext, x)

297 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

298 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

299

300 static const AVOption buffer_options[] = {

301 { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },

302 { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },

303 { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },

304 { "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, { .i64 = AV_PIX_FMT_NONE }, .min = AV_PIX_FMT_NONE, .max = INT_MAX, .flags = V },

305 { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },

306 { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },

307 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },

308 { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },

309 #if FF_API_SWS_PARAM_OPTION

310 { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },

311 #endif

312 { NULL },

313 };

314

315 AVFILTER_DEFINE_CLASS(buffer);

316

317 static const AVOption abuffer_options[] = {

318 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },

319 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },

320 { "sample_fmt", NULL, OFFSET(sample_fmt), AV_OPT_TYPE_SAMPLE_FMT, { .i64 = AV_SAMPLE_FMT_NONE }, .min = AV_SAMPLE_FMT_NONE, .max = INT_MAX, .flags = A },

321 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },

322 { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },

323 { NULL },

324 };

325

326 AVFILTER_DEFINE_CLASS(abuffer);

327

328 static av_cold int init_audio(AVFilterContext *ctx)

329 {

330 BufferSourceContext *s = ctx->priv;

331 char buf[128];

332 int ret = 0;

333

334 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {

335 av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");

336 return AVERROR(EINVAL);

337 }

338

339 if (s->channel_layout_str || s->ch_layout.nb_channels) {

340 int n;

341

342 if (!s->ch_layout.nb_channels) {

343 ret = av_channel_layout_from_string(&s->ch_layout, s->channel_layout_str);

344 if (ret < 0) {

345 #if FF_API_OLD_CHANNEL_LAYOUT

346 uint64_t mask;

347 FF_DISABLE_DEPRECATION_WARNINGS

348 mask = av_get_channel_layout(s->channel_layout_str);

349 if (!mask) {

350 #endif

351 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",

352 s->channel_layout_str);

353 return AVERROR(EINVAL);

354 #if FF_API_OLD_CHANNEL_LAYOUT

355 }

356 FF_ENABLE_DEPRECATION_WARNINGS

357 av_log(ctx, AV_LOG_WARNING, "Channel layout '%s' uses a deprecated syntax.\n",

358 s->channel_layout_str);

359 av_channel_layout_from_mask(&s->ch_layout, mask);

360 #endif

361 }

362 }

363

364 n = s->ch_layout.nb_channels;

365 av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));

366 if (s->channels) {

367 if (n != s->channels) {

368 av_log(ctx, AV_LOG_ERROR,

369 "Mismatching channel count %d and layout '%s' "

370 "(%d channels)\n",

371 s->channels, buf, n);

372 return AVERROR(EINVAL);

373 }

374 }

375 s->channels = n;

376 } else if (!s->channels) {

377 av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "

378 "channel layout specified\n");

379 return AVERROR(EINVAL);

380 } else {

381 s->ch_layout = FF_COUNT2LAYOUT(s->channels);

382 av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));

383 }

384

385 if (!s->time_base.num)

386 s->time_base = (AVRational){1, s->sample_rate};

387

388 av_log(ctx, AV_LOG_VERBOSE,

389 "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",

390 s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),

391 s->sample_rate, buf);

392

393 return ret;

394 }

395

396 static av_cold void uninit(AVFilterContext *ctx)

397 {

398 BufferSourceContext *s = ctx->priv;

399 av_buffer_unref(&s->hw_frames_ctx);

400 av_channel_layout_uninit(&s->ch_layout);

401 }

402

403 static int query_formats(AVFilterContext *ctx)

404 {

405 BufferSourceContext *c = ctx->priv;

406 AVFilterChannelLayouts *channel_layouts = NULL;

407 AVFilterFormats *formats = NULL;

408 AVFilterFormats *samplerates = NULL;

409 int ret;

410

411 switch (ctx->outputs[0]->type) {

412 case AVMEDIA_TYPE_VIDEO:

413 if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||

414 (ret = ff_set_common_formats (ctx , formats )) < 0)

415 return ret;

416 break;

417 case AVMEDIA_TYPE_AUDIO:

418 if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||

419 (ret = ff_set_common_formats (ctx , formats )) < 0 ||

420 (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||

421 (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)

422 return ret;

423

424 if ((ret = ff_add_channel_layout(&channel_layouts, &c->ch_layout)) < 0)

425 return ret;

426 if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)

427 return ret;

428 break;

429 default:

430 return AVERROR(EINVAL);

431 }

432

433 return 0;

434 }

435

436 static int config_props(AVFilterLink *link)

437 {

438 BufferSourceContext *c = link->src->priv;

439

440 switch (link->type) {

441 case AVMEDIA_TYPE_VIDEO:

442 link->w = c->w;

443 link->h = c->h;

444 link->sample_aspect_ratio = c->pixel_aspect;

445

446 if (c->hw_frames_ctx) {

447 link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);

448 if (!link->hw_frames_ctx)

449 return AVERROR(ENOMEM);

450 }

451 break;

452 case AVMEDIA_TYPE_AUDIO:

453 if (!c->ch_layout.nb_channels) {

454 int ret = av_channel_layout_copy(&c->ch_layout, &link->ch_layout);

455 if (ret < 0)

456 return ret;

457 }

458 break;

459 default:

460 return AVERROR(EINVAL);

461 }

462

463 link->time_base = c->time_base;

464 link->frame_rate = c->frame_rate;

465 return 0;

466 }

467

468 static int request_frame(AVFilterLink *link)

469 {

470 BufferSourceContext *c = link->src->priv;

471

472 if (c->eof)

473 return AVERROR_EOF;

474 c->nb_failed_requests++;

475 return AVERROR(EAGAIN);

476 }

477

478 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {

479 {

480 .name = "default",

481 .type = AVMEDIA_TYPE_VIDEO,

482 .request_frame = request_frame,

483 .config_props = config_props,

484 },

485 };

486

487 const AVFilter ff_vsrc_buffer = {

488 .name = "buffer",

489 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),

490 .priv_size = sizeof(BufferSourceContext),

491

492 .init = init_video,

493 .uninit = uninit,

494

495 .inputs = NULL,

496 FILTER_OUTPUTS(avfilter_vsrc_buffer_outputs),

497 FILTER_QUERY_FUNC(query_formats),

498 .priv_class = &buffer_class,

499 };

500

501 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {

502 {

503 .name = "default",

504 .type = AVMEDIA_TYPE_AUDIO,

505 .request_frame = request_frame,

506 .config_props = config_props,

507 },

508 };

509

510 const AVFilter ff_asrc_abuffer = {

511 .name = "abuffer",

512 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),

513 .priv_size = sizeof(BufferSourceContext),

514

515 .init = init_audio,

516 .uninit = uninit,

517

518 .inputs = NULL,

519 FILTER_OUTPUTS(avfilter_asrc_abuffer_outputs),

520 FILTER_QUERY_FUNC(query_formats),

521 .priv_class = &abuffer_class,

522 };

formats

Definition: signature.h:48

FF_ENABLE_DEPRECATION_WARNINGS

#define FF_ENABLE_DEPRECATION_WARNINGS

Definition: internal.h:83

AVFilterChannelLayouts

A list of supported channel layouts.

Definition: formats.h:85

AV_LOG_WARNING

#define AV_LOG_WARNING

Something somehow does not look correct.

Definition: log.h:186

AVPixelFormat

Pixel format.

Definition: pixfmt.h:64

AVERROR

Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions

opt.h

AV_OPT_TYPE_SAMPLE_FMT

@ AV_OPT_TYPE_SAMPLE_FMT

Definition: opt.h:237

AVFILTER_DEFINE_CLASS

AVFILTER_DEFINE_CLASS(buffer)

ff_filter_frame

int ff_filter_frame(AVFilterLink *link, AVFrame *frame)

Send a frame of data to the next filter.

Definition: avfilter.c:999

AVERROR_EOF

#define AVERROR_EOF

End of file.

Definition: error.h:57

av_get_channel_layout

uint64_t av_get_channel_layout(const char *name)

Return a channel layout id that matches name, or 0 if no match is found.

Definition: channel_layout.c:237

#define A

Definition: buffersrc.c:297

av_frame_free

void av_frame_free(AVFrame **frame)

Free the frame and any dynamically allocated objects in it, e.g.

Definition: frame.c:111

AVFrame

This structure describes decoded (raw) audio or video data.

Definition: frame.h:325

uint8_t w

Definition: llviddspenc.c:38

AVOption

AVOption.

Definition: opt.h:251

av_buffersrc_add_frame

int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)

Add a frame to the buffer source.

Definition: buffersrc.c:159

FILTER_QUERY_FUNC

#define FILTER_QUERY_FUNC(func)

Definition: internal.h:167

AV_BUFFERSRC_FLAG_PUSH

@ AV_BUFFERSRC_FLAG_PUSH

Immediately push the frame to the output.

Definition: buffersrc.h:46

OFFSET

#define OFFSET(x)

Definition: buffersrc.c:296

AV_LOG_VERBOSE

#define AV_LOG_VERBOSE

Detailed information.

Definition: log.h:196

float.h

CHECK_AUDIO_PARAM_CHANGE

#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)

Definition: buffersrc.c:76

AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT

@ AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT

Do not check for format changes.

Definition: buffersrc.h:41

ff_filter_graph_run_once

int ff_filter_graph_run_once(AVFilterGraph *graph)

Run one round of processing on a filter graph.

Definition: avfiltergraph.c:1339

AVChannelLayout::order

enum AVChannelOrder order

Channel order used in this layout.

Definition: channel_layout.h:295

av_buffer_ref

AVBufferRef * av_buffer_ref(const AVBufferRef *buf)

Create a new reference to an AVBuffer.

Definition: buffer.c:103

AVFilter::name

const char * name

Filter name.

Definition: avfilter.h:175

BufferSourceContext::channels

int channels

Definition: buffersrc.c:62

AVChannelLayout::mask

uint64_t mask

This member must be used for AV_CHANNEL_ORDER_NATIVE, and may be used for AV_CHANNEL_ORDER_AMBISONIC ...

Definition: channel_layout.h:322

AV_OPT_TYPE_RATIONAL

@ AV_OPT_TYPE_RATIONAL

Definition: opt.h:230

AVChannelLayout::nb_channels

int nb_channels

Number of channels in this layout.

Definition: channel_layout.h:300

abuffer_options

static const AVOption abuffer_options[]

Definition: buffersrc.c:317

video.h

AVFilterLink

A link between two filters.

Definition: avfilter.h:538

AVBufferSrcParameters::height

int height

Definition: buffersrc.h:87

sample_rate

Definition: ffmpeg_filter.c:153

av_channel_layout_copy

int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)

Make a copy of a channel layout.

Definition: channel_layout.c:637

AVFilterFormats

A list of supported formats for one end of a filter link.

Definition: formats.h:64

formats.h

init

static int init

Definition: av_tx.c:47

uninit

static av_cold void uninit(AVFilterContext *ctx)

Definition: buffersrc.c:396

AVFilterContext::priv

void * priv

private data for use by the filter

Definition: avfilter.h:423

AVBufferSrcParameters::sample_aspect_ratio

AVRational sample_aspect_ratio

Video only, the sample (pixel) aspect ratio.

Definition: buffersrc.h:92

BufferSourceContext::frame_rate

AVRational frame_rate

frame_rate to set in the output link

Definition: buffersrc.c:46

samplefmt.h

ff_vsrc_buffer

const AVFilter ff_vsrc_buffer

Definition: buffersrc.c:487

AVFrame::ch_layout

AVChannelLayout ch_layout

Channel layout of the audio data.

Definition: frame.h:704

pts

static int64_t pts

Definition: transcode_aac.c:654

AVRational::num

int num

Numerator.

Definition: rational.h:59

AVFilterPad

A filter pad used for either input or output.

Definition: internal.h:49

av_frame_alloc

AVFrame * av_frame_alloc(void)

Allocate an AVFrame and set its fields to default values.

Definition: frame.c:99

BufferSourceContext::sample_rate

int sample_rate

Definition: buffersrc.c:60

AVBufferSrcParameters::ch_layout

AVChannelLayout ch_layout

Audio only, the audio channel layout.

Definition: buffersrc.h:125

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:180

av_cold

#define av_cold

Definition: attributes.h:90

ff_set_common_formats

int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)

A helper for query_formats() which sets all links to the same list of formats.

Definition: formats.c:749

AV_CHANNEL_ORDER_NATIVE

@ AV_CHANNEL_ORDER_NATIVE

The native channel order, i.e.

Definition: channel_layout.h:112

mask

static const uint16_t mask[17]

Definition: lzw.c:38

#define s(width, name)

Definition: cbs_vp9.c:256

BufferSourceContext::h

int h

Definition: buffersrc.c:50

AV_CHANNEL_ORDER_UNSPEC

@ AV_CHANNEL_ORDER_UNSPEC

Only the channel count is specified, without any further information about the channel order.

Definition: channel_layout.h:106

AVMEDIA_TYPE_AUDIO

@ AVMEDIA_TYPE_AUDIO

Definition: avutil.h:202

av_q2d

static double av_q2d(AVRational a)

Convert an AVRational to a double.

Definition: rational.h:104

push_frame

static int push_frame(AVFilterGraph *graph)

Definition: buffersrc.c:164

BufferSourceContext

Definition: buffersrc.c:43

avfilter_vsrc_buffer_outputs

static const AVFilterPad avfilter_vsrc_buffer_outputs[]

Definition: buffersrc.c:478

BufferSourceContext::ch_layout

AVChannelLayout ch_layout

Definition: buffersrc.c:64

ctx

AVFormatContext * ctx

Definition: movenc.c:48

channels

Definition: aptx.h:32

pix_fmt

static enum AVPixelFormat pix_fmt

Definition: demuxing_decoding.c:41

av_get_sample_fmt_name

const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)

Return the name of sample_fmt, or NULL if sample_fmt is not recognized.

Definition: samplefmt.c:51

buffer_options

static const AVOption buffer_options[]

Definition: buffersrc.c:300

link

Definition: filter_design.txt:23

BufferSourceContext::eof

int eof

Definition: buffersrc.c:66

AVClass

Describe the class of an AVClass context structure.

Definition: log.h:66

AVChannelLayout::u

union AVChannelLayout::@296 u

Details about which channels are present in this layout.

NULL

#define NULL

Definition: coverity.c:32

av_buffer_unref

void av_buffer_unref(AVBufferRef **buf)

Free a given reference and automatically free the buffer if there are no more references to it.

Definition: buffer.c:139

AVRational

Rational number (pair of numerator and denominator).

Definition: rational.h:58

AV_OPT_TYPE_IMAGE_SIZE

@ AV_OPT_TYPE_IMAGE_SIZE

offset must point to two consecutive integers

Definition: opt.h:235

ff_add_format

int ff_add_format(AVFilterFormats **avff, int64_t fmt)

Add fmt to the list of media formats contained in *avff.

Definition: formats.c:449

BufferSourceContext::nb_failed_requests

unsigned nb_failed_requests

Definition: buffersrc.c:47

AVFilterGraph

Definition: avfilter.h:871

inputs

Definition: filter_design.txt:243

ff_add_channel_layout

int ff_add_channel_layout(AVFilterChannelLayouts **l, const AVChannelLayout *channel_layout)

Definition: formats.c:466

Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c

Definition: undefined.txt:32

BufferSourceContext::pixel_aspect

AVRational pixel_aspect

Definition: buffersrc.c:52

av_channel_layout_uninit

void av_channel_layout_uninit(AVChannelLayout *channel_layout)

Free any allocated data in the channel layout and reset the channel count to 0.

Definition: channel_layout.c:630

AVBufferSrcParameters::frame_rate

AVRational frame_rate

Video only, the frame rate of the input video.

Definition: buffersrc.h:100

av_buffersrc_close

int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)

Close the buffer source after EOF.

Definition: buffersrc.c:259

#define V

Definition: buffersrc.c:298

NULL_IF_CONFIG_SMALL

#define NULL_IF_CONFIG_SMALL(x)

Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.

Definition: internal.h:117

copy

static void copy(const float *p1, float *p2, const int length)

Definition: vf_vaguedenoiser.c:187

av_frame_ref

int av_frame_ref(AVFrame *dst, const AVFrame *src)

Set up a new reference to the data described by the source frame.

Definition: frame.c:343

AVChannelLayout

An AVChannelLayout holds information about the channel layout of audio data.

Definition: channel_layout.h:290

av_buffersrc_parameters_alloc

AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)

Allocate a new AVBufferSrcParameters instance.

Definition: buffersrc.c:86

av_get_channel_layout_nb_channels

int av_get_channel_layout_nb_channels(uint64_t channel_layout)

Return the number of channels in the channel layout.

Definition: channel_layout.c:318

BufferSourceContext::hw_frames_ctx

AVBufferRef * hw_frames_ctx

Definition: buffersrc.c:57

config_props

static int config_props(AVFilterLink *link)

Definition: buffersrc.c:436

AVBufferSrcParameters::hw_frames_ctx

AVBufferRef * hw_frames_ctx

Video with a hwaccel pixel format only.

Definition: buffersrc.h:106

AVBufferSrcParameters::sample_rate

int sample_rate

Audio only, the audio sampling rate in samples per second.

Definition: buffersrc.h:111

AV_SAMPLE_FMT_NONE

@ AV_SAMPLE_FMT_NONE

Definition: samplefmt.h:56

AV_NOPTS_VALUE

#define AV_NOPTS_VALUE

Undefined timestamp value.

Definition: avutil.h:248

AVFrame::time_base

AVRational time_base

Time base for the timestamps in this frame.

Definition: frame.h:447

frame.h

AVBufferSrcParameters::time_base

AVRational time_base

The timebase to be used for the timestamps on the input frames.

Definition: buffersrc.h:82

request_frame

static int request_frame(AVFilterLink *link)

Definition: buffersrc.c:468

init_audio

static av_cold int init_audio(AVFilterContext *ctx)

Definition: buffersrc.c:328

query_formats

static int query_formats(AVFilterContext *ctx)

Definition: buffersrc.c:403

internal.h

CHECK_VIDEO_PARAM_CHANGE

#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)

Definition: buffersrc.c:69

av_buffersrc_parameters_set

int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)

Initialize the buffersrc or abuffersrc filter with the provided parameters.

Definition: buffersrc.c:97

BufferSourceContext::w

int w

Definition: buffersrc.c:50

BufferSourceContext::pix_fmt

enum AVPixelFormat pix_fmt

Definition: buffersrc.c:51

AVBufferSrcParameters::width

int width

Video only, the display dimensions of the input frames.

Definition: buffersrc.h:87

ff_avfilter_link_set_in_status

void ff_avfilter_link_set_in_status(AVFilterLink *link, int status, int64_t pts)

Set the status field of a link from the source filter.

Definition: avfilter.c:209

internal.h

av_buffersrc_add_frame_flags

int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)

Add a frame to the buffer source.

Definition: buffersrc.c:178

common.h

AVSampleFormat

Audio sample formats.

Definition: samplefmt.h:55

init_video

static av_cold int init_video(AVFilterContext *ctx)

Definition: buffersrc.c:268

av_frame_move_ref

void av_frame_move_ref(AVFrame *dst, AVFrame *src)

Move everything contained in src to dst and reset src.

Definition: frame.c:506

av_mallocz

void * av_mallocz(size_t size)

Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...

Definition: mem.c:264

AVFilterPad::name

const char * name

Pad name.

Definition: internal.h:55

AVFilter

Filter definition.

Definition: avfilter.h:171

av_channel_layout_from_mask

FF_ENABLE_DEPRECATION_WARNINGS int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)

Initialize a native channel layout from a bitmask indicating which channels are present.

Definition: channel_layout.c:389

ret

Definition: filter_design.txt:187

frame

these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame

Definition: filter_design.txt:264

FF_COUNT2LAYOUT

#define FF_COUNT2LAYOUT(c)

Encode a channel count as a channel layout.

Definition: formats.h:102

AVFrame::sample_aspect_ratio

AVRational sample_aspect_ratio

Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.

Definition: frame.h:427

AVFrame::hw_frames_ctx

AVBufferRef * hw_frames_ctx

For hwaccel-format frames, this should be a reference to the AVHWFramesContext describing the frame.

Definition: frame.h:659

channel_layout.h

AVBufferSrcParameters

This structure contains the parameters describing the frames that will be passed to this filter.

Definition: buffersrc.h:73

AVBufferSrcParameters::format

int format

video: the pixel format, value corresponds to enum AVPixelFormat audio: the sample format,...

Definition: buffersrc.h:78

buffer

the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer

Definition: filter_design.txt:49

av_channel_layout_from_string

int av_channel_layout_from_string(AVChannelLayout *channel_layout, const char *str)

Initialize a channel layout from a given string description.

Definition: channel_layout.c:402

AV_BUFFERSRC_FLAG_KEEP_REF

@ AV_BUFFERSRC_FLAG_KEEP_REF

Keep a reference to the frame.

Definition: buffersrc.h:53

AVRational::den

int den

Denominator.