FFmpeg: libavfilter/af_join.c Source File

FFmpeg

[フレーム]

libavfilter

af_join.c

Go to the documentation of this file.

1 /*

2 *

3 * This file is part of Libav.

4 *

5 * Libav is free software; you can redistribute it and/or

6 * modify it under the terms of the GNU Lesser General Public

7 * License as published by the Free Software Foundation; either

8 * version 2.1 of the License, or (at your option) any later version.

9 *

10 * Libav is distributed in the hope that it will be useful,

11 * but WITHOUT ANY WARRANTY; without even the implied warranty of

12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

13 * Lesser General Public License for more details.

14 *

15 * You should have received a copy of the GNU Lesser General Public

16 * License along with Libav; if not, write to the Free Software

17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

18 */

20 /**

21 * @file

22 * Audio join filter

23 *

24 * Join multiple audio inputs as different channels in

25 * a single output

26 */

28 #include "libavutil/avassert.h"

29 #include "libavutil/channel_layout.h"

30 #include "libavutil/common.h"

31 #include "libavutil/opt.h"

33 #include "audio.h"

34 #include "avfilter.h"

35 #include "formats.h"

36 #include "internal.h"

38 typedef struct ChannelMap {

39 int input; ///< input stream index

40 int in_channel_idx; ///< index of in_channel in the input stream data

41 uint64_t in_channel; ///< layout describing the input channel

42 uint64_t out_channel; ///< layout describing the output channel

43 } ChannelMap;

45 typedef struct JoinContext {

46 const AVClass *class;

48 int inputs;

49 char *map;

50 char *channel_layout_str;

51 uint64_t channel_layout;

53 int nb_channels;

54 ChannelMap *channels;

56 /**

57 * Temporary storage for input frames, until we get one on each input.

58 */

59 AVFrame **input_frames;

61 /**

62 * Temporary storage for buffer references, for assembling the output frame.

63 */

64 AVBufferRef **buffers;

65 } JoinContext;

67 #define OFFSET(x) offsetof(JoinContext, x)

68 #define A AV_OPT_FLAG_AUDIO_PARAM

69 #define F AV_OPT_FLAG_FILTERING_PARAM

70 static const AVOption join_options[] = {

71 { "inputs", "Number of input streams.", OFFSET(inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, A|F },

72 { "channel_layout", "Channel layout of the "

73 "output stream.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, A|F },

74 { "map", "A comma-separated list of channels maps in the format "

75 "'input_stream.input_channel-output_channel.",

76 OFFSET(map), AV_OPT_TYPE_STRING, .flags = A|F },

77 { NULL },

78 };

80 AVFILTER_DEFINE_CLASS(join);

82 static int filter_frame(AVFilterLink *link, AVFrame *frame)

83 {

84 AVFilterContext *ctx = link->dst;

85 JoinContext *s = ctx->priv;

86 int i;

88 for (i = 0; i < ctx->nb_inputs; i++)

89 if (link == ctx->inputs[i])

90 break;

91 av_assert0(i < ctx->nb_inputs);

92 av_assert0(!s->input_frames[i]);

93 s->input_frames[i] = frame;

95 return 0;

96 }

98 static int parse_maps(AVFilterContext *ctx)

99 {

100 JoinContext *s = ctx->priv;

101 char separator = '|';

102 char *cur = s->map;

103

104 #if FF_API_OLD_FILTER_OPTS

105 if (cur && strchr(cur, ',')) {

106 av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "

107 "separate the mappings.\n");

108 separator = ',';

109 }

110 #endif

111

112 while (cur && *cur) {

113 char *sep, *next, *p;

114 uint64_t in_channel = 0, out_channel = 0;

115 int input_idx, out_ch_idx, in_ch_idx;

116

117 next = strchr(cur, separator);

118 if (next)

119 *next++ = 0;

120

121 /* split the map into input and output parts */

122 if (!(sep = strchr(cur, '-'))) {

123 av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "

124 "map '%s'\n", cur);

125 return AVERROR(EINVAL);

126 }

127 *sep++ = 0;

128

129 #define PARSE_CHANNEL(str, var, inout) \

130 if (!(var = av_get_channel_layout(str))) { \

131 av_log(ctx, AV_LOG_ERROR, "Invalid " inout " channel: %s.\n", str);\

132 return AVERROR(EINVAL); \

133 } \

134 if (av_get_channel_layout_nb_channels(var) != 1) { \

135 av_log(ctx, AV_LOG_ERROR, "Channel map describes more than one " \

136 inout " channel.\n"); \

137 return AVERROR(EINVAL); \

138 }

139

140 /* parse output channel */

141 PARSE_CHANNEL(sep, out_channel, "output");

142 if (!(out_channel & s->channel_layout)) {

143 av_log(ctx, AV_LOG_ERROR, "Output channel '%s' is not present in "

144 "requested channel layout.\n", sep);

145 return AVERROR(EINVAL);

146 }

147

148 out_ch_idx = av_get_channel_layout_channel_index(s->channel_layout,

149 out_channel);

150 if (s->channels[out_ch_idx].input >= 0) {

151 av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "

152 "'%s'.\n", sep);

153 return AVERROR(EINVAL);

154 }

155

156 /* parse input channel */

157 input_idx = strtol(cur, &cur, 0);

158 if (input_idx < 0 || input_idx >= s->inputs) {

159 av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",

160 input_idx);

161 return AVERROR(EINVAL);

162 }

163

164 if (*cur)

165 cur++;

166

167 in_ch_idx = strtol(cur, &p, 0);

168 if (p == cur) {

169 /* channel specifier is not a number,

170 * try to parse as channel name */

171 PARSE_CHANNEL(cur, in_channel, "input");

172 }

173

174 s->channels[out_ch_idx].input = input_idx;

175 if (in_channel)

176 s->channels[out_ch_idx].in_channel = in_channel;

177 else

178 s->channels[out_ch_idx].in_channel_idx = in_ch_idx;

179

180 cur = next;

181 }

182 return 0;

183 }

184

185 static av_cold int join_init(AVFilterContext *ctx)

186 {

187 JoinContext *s = ctx->priv;

188 int ret, i;

189

190 if (!(s->channel_layout = av_get_channel_layout(s->channel_layout_str))) {

191 av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",

192 s->channel_layout_str);

193 ret = AVERROR(EINVAL);

194 goto fail;

195 }

196

197 s->nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);

198 s->channels = av_mallocz(sizeof(*s->channels) * s->nb_channels);

199 s->buffers = av_mallocz(sizeof(*s->buffers) * s->nb_channels);

200 s->input_frames = av_mallocz(sizeof(*s->input_frames) * s->inputs);

201 if (!s->channels || !s->buffers|| !s->input_frames) {

202 ret = AVERROR(ENOMEM);

203 goto fail;

204 }

205

206 for (i = 0; i < s->nb_channels; i++) {

207 s->channels[i].out_channel = av_channel_layout_extract_channel(s->channel_layout, i);

208 s->channels[i].input = -1;

209 }

210

211 if ((ret = parse_maps(ctx)) < 0)

212 goto fail;

213

214 for (i = 0; i < s->inputs; i++) {

215 char name[32];

216 AVFilterPad pad = { 0 };

217

218 snprintf(name, sizeof(name), "input%d", i);

219 pad.type = AVMEDIA_TYPE_AUDIO;

220 pad.name = av_strdup(name);

221 pad.filter_frame = filter_frame;

222

223 pad.needs_fifo = 1;

224

225 ff_insert_inpad(ctx, i, &pad);

226 }

227

228 fail:

229 av_opt_free(s);

230 return ret;

231 }

232

233 static av_cold void join_uninit(AVFilterContext *ctx)

234 {

235 JoinContext *s = ctx->priv;

236 int i;

237

238 for (i = 0; i < ctx->nb_inputs; i++) {

239 av_freep(&ctx->input_pads[i].name);

240 av_frame_free(&s->input_frames[i]);

241 }

242

243 av_freep(&s->channels);

244 av_freep(&s->buffers);

245 av_freep(&s->input_frames);

246 }

247

248 static int join_query_formats(AVFilterContext *ctx)

249 {

250 JoinContext *s = ctx->priv;

251 AVFilterChannelLayouts *layouts = NULL;

252 int i;

253

254 ff_add_channel_layout(&layouts, s->channel_layout);

255 ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);

256

257 for (i = 0; i < ctx->nb_inputs; i++)

258 ff_channel_layouts_ref(ff_all_channel_layouts(),

259 &ctx->inputs[i]->out_channel_layouts);

260

261 ff_set_common_formats (ctx, ff_planar_sample_fmts());

262 ff_set_common_samplerates(ctx, ff_all_samplerates());

263

264 return 0;

265 }

266

267 static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch,

268 uint64_t *inputs)

269 {

270 int i;

271

272 for (i = 0; i < ctx->nb_inputs; i++) {

273 AVFilterLink *link = ctx->inputs[i];

274

275 if (ch->out_channel & link->channel_layout &&

276 !(ch->out_channel & inputs[i])) {

277 ch->input = i;

278 ch->in_channel = ch->out_channel;

279 inputs[i] |= ch->out_channel;

280 return;

281 }

282 }

283 }

284

285 static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch,

286 uint64_t *inputs)

287 {

288 int i;

289

290 for (i = 0; i < ctx->nb_inputs; i++) {

291 AVFilterLink *link = ctx->inputs[i];

292

293 if ((inputs[i] & link->channel_layout) != link->channel_layout) {

294 uint64_t unused = link->channel_layout & ~inputs[i];

295

296 ch->input = i;

297 ch->in_channel = av_channel_layout_extract_channel(unused, 0);

298 inputs[i] |= ch->in_channel;

299 return;

300 }

301 }

302 }

303

304 static int join_config_output(AVFilterLink *outlink)

305 {

306 AVFilterContext *ctx = outlink->src;

307 JoinContext *s = ctx->priv;

308 uint64_t *inputs; // nth element tracks which channels are used from nth input

309 int i, ret = 0;

310

311 /* initialize inputs to user-specified mappings */

312 if (!(inputs = av_mallocz(sizeof(*inputs) * ctx->nb_inputs)))

313 return AVERROR(ENOMEM);

314 for (i = 0; i < s->nb_channels; i++) {

315 ChannelMap *ch = &s->channels[i];

316 AVFilterLink *inlink;

317

318 if (ch->input < 0)

319 continue;

320

321 inlink = ctx->inputs[ch->input];

322

323 if (!ch->in_channel)

324 ch->in_channel = av_channel_layout_extract_channel(inlink->channel_layout,

325 ch->in_channel_idx);

326

327 if (!(ch->in_channel & inlink->channel_layout)) {

328 av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "

329 "input stream #%d.\n", av_get_channel_name(ch->in_channel),

330 ch->input);

331 ret = AVERROR(EINVAL);

332 goto fail;

333 }

334

335 inputs[ch->input] |= ch->in_channel;

336 }

337

338 /* guess channel maps when not explicitly defined */

339 /* first try unused matching channels */

340 for (i = 0; i < s->nb_channels; i++) {

341 ChannelMap *ch = &s->channels[i];

342

343 if (ch->input < 0)

344 guess_map_matching(ctx, ch, inputs);

345 }

346

347 /* if the above failed, try to find _any_ unused input channel */

348 for (i = 0; i < s->nb_channels; i++) {

349 ChannelMap *ch = &s->channels[i];

350

351 if (ch->input < 0)

352 guess_map_any(ctx, ch, inputs);

353

354 if (ch->input < 0) {

355 av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "

356 "output channel '%s'.\n",

357 av_get_channel_name(ch->out_channel));

358 goto fail;

359 }

360

361 ch->in_channel_idx = av_get_channel_layout_channel_index(ctx->inputs[ch->input]->channel_layout,

362 ch->in_channel);

363 }

364

365 /* print mappings */

366 av_log(ctx, AV_LOG_VERBOSE, "mappings: ");

367 for (i = 0; i < s->nb_channels; i++) {

368 ChannelMap *ch = &s->channels[i];

369 av_log(ctx, AV_LOG_VERBOSE, "%d.%s => %s ", ch->input,

370 av_get_channel_name(ch->in_channel),

371 av_get_channel_name(ch->out_channel));

372 }

373 av_log(ctx, AV_LOG_VERBOSE, "\n");

374

375 for (i = 0; i < ctx->nb_inputs; i++) {

376 if (!inputs[i])

377 av_log(ctx, AV_LOG_WARNING, "No channels are used from input "

378 "stream %d.\n", i);

379 }

380

381 fail:

382 av_freep(&inputs);

383 return ret;

384 }

385

386 static int join_request_frame(AVFilterLink *outlink)

387 {

388 AVFilterContext *ctx = outlink->src;

389 JoinContext *s = ctx->priv;

390 AVFrame *frame;

391 int linesize = INT_MAX;

392 int nb_samples = 0;

393 int nb_buffers = 0;

394 int i, j, ret;

395

396 /* get a frame on each input */

397 for (i = 0; i < ctx->nb_inputs; i++) {

398 AVFilterLink *inlink = ctx->inputs[i];

399

400 if (!s->input_frames[i] &&

401 (ret = ff_request_frame(inlink)) < 0)

402 return ret;

403

404 /* request the same number of samples on all inputs */

405 if (i == 0) {

406 nb_samples = s->input_frames[0]->nb_samples;

407

408 for (j = 1; !i && j < ctx->nb_inputs; j++)

409 ctx->inputs[j]->request_samples = nb_samples;

410 }

411 }

412

413 /* setup the output frame */

414 frame = av_frame_alloc();

415 if (!frame)

416 return AVERROR(ENOMEM);

417 if (s->nb_channels > FF_ARRAY_ELEMS(frame->data)) {

418 frame->extended_data = av_mallocz(s->nb_channels *

419 sizeof(*frame->extended_data));

420 if (!frame->extended_data) {

421 ret = AVERROR(ENOMEM);

422 goto fail;

423 }

424 }

425

426 /* copy the data pointers */

427 for (i = 0; i < s->nb_channels; i++) {

428 ChannelMap *ch = &s->channels[i];

429 AVFrame *cur = s->input_frames[ch->input];

430 AVBufferRef *buf;

431

432 frame->extended_data[i] = cur->extended_data[ch->in_channel_idx];

433 linesize = FFMIN(linesize, cur->linesize[0]);

434

435 /* add the buffer where this plan is stored to the list if it's

436 * not already there */

437 buf = av_frame_get_plane_buffer(cur, ch->in_channel_idx);

438 if (!buf) {

439 ret = AVERROR(EINVAL);

440 goto fail;

441 }

442 for (j = 0; j < nb_buffers; j++)

443 if (s->buffers[j]->buffer == buf->buffer)

444 break;

445 if (j == i)

446 s->buffers[nb_buffers++] = buf;

447 }

448

449 /* create references to the buffers we copied to output */

450 if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {

451 frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);

452 frame->extended_buf = av_mallocz(sizeof(*frame->extended_buf) *

453 frame->nb_extended_buf);

454 if (!frame->extended_buf) {

455 frame->nb_extended_buf = 0;

456 ret = AVERROR(ENOMEM);

457 goto fail;

458 }

459 }

460 for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {

461 frame->buf[i] = av_buffer_ref(s->buffers[i]);

462 if (!frame->buf[i]) {

463 ret = AVERROR(ENOMEM);

464 goto fail;

465 }

466 }

467 for (i = 0; i < frame->nb_extended_buf; i++) {

468 frame->extended_buf[i] = av_buffer_ref(s->buffers[i +

469 FF_ARRAY_ELEMS(frame->buf)]);

470 if (!frame->extended_buf[i]) {

471 ret = AVERROR(ENOMEM);

472 goto fail;

473 }

474 }

475

476 frame->nb_samples = nb_samples;

477 frame->channel_layout = outlink->channel_layout;

478 av_frame_set_channels(frame, outlink->channels);

479 frame->format = outlink->format;

480 frame->sample_rate = outlink->sample_rate;

481 frame->pts = s->input_frames[0]->pts;

482 frame->linesize[0] = linesize;

483 if (frame->data != frame->extended_data) {

484 memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *

485 FFMIN(FF_ARRAY_ELEMS(frame->data), s->nb_channels));

486 }

487

488 ret = ff_filter_frame(outlink, frame);

489

490 for (i = 0; i < ctx->nb_inputs; i++)

491 av_frame_free(&s->input_frames[i]);

492

493 return ret;

494

495 fail:

496 av_frame_free(&frame);

497 return ret;

498 }

499

500 static const AVFilterPad avfilter_af_join_outputs[] = {

501 {

502 .name = "default",

503 .type = AVMEDIA_TYPE_AUDIO,

504 .config_props = join_config_output,

505 .request_frame = join_request_frame,

506 },

507 { NULL }

508 };

509

510 AVFilter avfilter_af_join = {

511 .name = "join",

512 .description = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "

513 "multi-channel output."),

514 .priv_size = sizeof(JoinContext),

515 .priv_class = &join_class,

516

517 .init = join_init,

518 .uninit = join_uninit,

519 .query_formats = join_query_formats,

520

521 .inputs = NULL,

522 .outputs = avfilter_af_join_outputs,

523

524 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,

525 };

Generated on Wed Jul 10 2013 23:48:09 for FFmpeg by doxygen 1.8.2