FFmpeg: libavfilter/af_join.c Source File

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libavfilter

af_join.c

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1 /*

2 * This file is part of FFmpeg.

3 *

4 * FFmpeg is free software; you can redistribute it and/or

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

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

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

8 *

9 * FFmpeg is distributed in the hope that it will be useful,

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

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

12 * Lesser General Public License for more details.

13 *

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

15 * License along with FFmpeg; if not, write to the Free Software

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

17 */

19 /**

20 * @file

21 * Audio join filter

22 *

23 * Join multiple audio inputs as different channels in

24 * a single output

25 */

27 #include "libavutil/avassert.h"

28 #include "libavutil/channel_layout.h"

29 #include "libavutil/common.h"

30 #include "libavutil/opt.h"

32 #include "audio.h"

33 #include "avfilter.h"

34 #include "formats.h"

35 #include "internal.h"

37 typedef struct ChannelMap {

38 int input; ///< input stream index

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

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

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

42 } ChannelMap;

44 typedef struct JoinContext {

45 const AVClass *class;

47 int inputs;

48 char *map;

49 char *channel_layout_str;

50 uint64_t channel_layout;

52 int nb_channels;

53 ChannelMap *channels;

55 /**

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

57 */

58 AVFrame **input_frames;

60 /**

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

62 */

63 AVBufferRef **buffers;

64 } JoinContext;

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

67 #define A AV_OPT_FLAG_AUDIO_PARAM

68 #define F AV_OPT_FLAG_FILTERING_PARAM

69 static const AVOption join_options[] = {

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

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

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

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

74 "'input_stream.input_channel-output_channel.",

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

76 { NULL }

77 };

79 AVFILTER_DEFINE_CLASS(join);

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

82 {

83 AVFilterContext *ctx = link->dst;

84 JoinContext *s = ctx->priv;

85 int i;

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

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

89 break;

90 av_assert0(i < ctx->nb_inputs);

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

92 s->input_frames[i] = frame;

94 return 0;

95 }

97 static int parse_maps(AVFilterContext *ctx)

98 {

99 JoinContext *s = ctx->priv;

100 char separator = '|';

101 char *cur = s->map;

102

103 #if FF_API_OLD_FILTER_OPTS

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

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

106 "separate the mappings.\n");

107 separator = ',';

108 }

109 #endif

110

111 while (cur && *cur) {

112 char *sep, *next, *p;

113 uint64_t in_channel = 0, out_channel = 0;

114 int input_idx, out_ch_idx, in_ch_idx;

115

116 next = strchr(cur, separator);

117 if (next)

118 *next++ = 0;

119

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

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

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

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

124 return AVERROR(EINVAL);

125 }

126 *sep++ = 0;

127

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

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

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

131 return AVERROR(EINVAL); \

132 } \

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

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

135 inout " channel.\n"); \

136 return AVERROR(EINVAL); \

137 }

138

139 /* parse output channel */

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

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

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

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

144 return AVERROR(EINVAL);

145 }

146

147 out_ch_idx = av_get_channel_layout_channel_index(s->channel_layout,

148 out_channel);

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

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

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

152 return AVERROR(EINVAL);

153 }

154

155 /* parse input channel */

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

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

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

159 input_idx);

160 return AVERROR(EINVAL);

161 }

162

163 if (*cur)

164 cur++;

165

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

167 if (p == cur) {

168 /* channel specifier is not a number,

169 * try to parse as channel name */

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

171 }

172

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

174 if (in_channel)

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

176 else

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

178

179 cur = next;

180 }

181 return 0;

182 }

183

184 static av_cold int join_init(AVFilterContext *ctx)

185 {

186 JoinContext *s = ctx->priv;

187 int ret, i;

188

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

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

191 s->channel_layout_str);

192 return AVERROR(EINVAL);

193 }

194

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

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

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

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

199 if (!s->channels || !s->buffers|| !s->input_frames)

200 return AVERROR(ENOMEM);

201

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

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

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

205 }

206

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

208 return ret;

209

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

211 char name[32];

212 AVFilterPad pad = { 0 };

213

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

215 pad.type = AVMEDIA_TYPE_AUDIO;

216 pad.name = av_strdup(name);

217 pad.filter_frame = filter_frame;

218

219 pad.needs_fifo = 1;

220

221 ff_insert_inpad(ctx, i, &pad);

222 }

223

224 return 0;

225 }

226

227 static av_cold void join_uninit(AVFilterContext *ctx)

228 {

229 JoinContext *s = ctx->priv;

230 int i;

231

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

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

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

235 }

236

237 av_freep(&s->channels);

238 av_freep(&s->buffers);

239 av_freep(&s->input_frames);

240 }

241

242 static int join_query_formats(AVFilterContext *ctx)

243 {

244 JoinContext *s = ctx->priv;

245 AVFilterChannelLayouts *layouts = NULL;

246 int i;

247

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

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

250

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

252 ff_channel_layouts_ref(ff_all_channel_layouts(),

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

254

255 ff_set_common_formats (ctx, ff_planar_sample_fmts());

256 ff_set_common_samplerates(ctx, ff_all_samplerates());

257

258 return 0;

259 }

260

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

262 uint64_t *inputs)

263 {

264 int i;

265

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

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

268

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

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

271 ch->input = i;

272 ch->in_channel = ch->out_channel;

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

274 return;

275 }

276 }

277 }

278

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

280 uint64_t *inputs)

281 {

282 int i;

283

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

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

286

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

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

289

290 ch->input = i;

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

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

293 return;

294 }

295 }

296 }

297

298 static int join_config_output(AVFilterLink *outlink)

299 {

300 AVFilterContext *ctx = outlink->src;

301 JoinContext *s = ctx->priv;

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

303 int i, ret = 0;

304

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

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

307 return AVERROR(ENOMEM);

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

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

310 AVFilterLink *inlink;

311

312 if (ch->input < 0)

313 continue;

314

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

316

317 if (!ch->in_channel)

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

319 ch->in_channel_idx);

320

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

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

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

324 ch->input);

325 ret = AVERROR(EINVAL);

326 goto fail;

327 }

328

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

330 }

331

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

333 /* first try unused matching channels */

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

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

336

337 if (ch->input < 0)

338 guess_map_matching(ctx, ch, inputs);

339 }

340

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

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

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

344

345 if (ch->input < 0)

346 guess_map_any(ctx, ch, inputs);

347

348 if (ch->input < 0) {

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

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

351 av_get_channel_name(ch->out_channel));

352 goto fail;

353 }

354

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

356 ch->in_channel);

357 }

358

359 /* print mappings */

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

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

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

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

364 av_get_channel_name(ch->in_channel),

365 av_get_channel_name(ch->out_channel));

366 }

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

368

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

370 if (!inputs[i])

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

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

373 }

374

375 fail:

376 av_freep(&inputs);

377 return ret;

378 }

379

380 static int join_request_frame(AVFilterLink *outlink)

381 {

382 AVFilterContext *ctx = outlink->src;

383 JoinContext *s = ctx->priv;

384 AVFrame *frame;

385 int linesize = INT_MAX;

386 int nb_samples = 0;

387 int nb_buffers = 0;

388 int i, j, ret;

389

390 /* get a frame on each input */

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

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

393

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

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

396 return ret;

397

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

399 if (i == 0) {

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

401

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

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

404 }

405 }

406

407 /* setup the output frame */

408 frame = av_frame_alloc();

409 if (!frame)

410 return AVERROR(ENOMEM);

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

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

413 sizeof(*frame->extended_data));

414 if (!frame->extended_data) {

415 ret = AVERROR(ENOMEM);

416 goto fail;

417 }

418 }

419

420 /* copy the data pointers */

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

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

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

424 AVBufferRef *buf;

425

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

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

428

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

430 * not already there */

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

432 if (!buf) {

433 ret = AVERROR(EINVAL);

434 goto fail;

435 }

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

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

438 break;

439 if (j == i)

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

441 }

442

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

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

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

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

447 frame->nb_extended_buf);

448 if (!frame->extended_buf) {

449 frame->nb_extended_buf = 0;

450 ret = AVERROR(ENOMEM);

451 goto fail;

452 }

453 }

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

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

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

457 ret = AVERROR(ENOMEM);

458 goto fail;

459 }

460 }

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

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

463 FF_ARRAY_ELEMS(frame->buf)]);

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

465 ret = AVERROR(ENOMEM);

466 goto fail;

467 }

468 }

469

470 frame->nb_samples = nb_samples;

471 frame->channel_layout = outlink->channel_layout;

472 av_frame_set_channels(frame, outlink->channels);

473 frame->format = outlink->format;

474 frame->sample_rate = outlink->sample_rate;

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

476 frame->linesize[0] = linesize;

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

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

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

480 }

481

482 ret = ff_filter_frame(outlink, frame);

483

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

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

486

487 return ret;

488

489 fail:

490 av_frame_free(&frame);

491 return ret;

492 }

493

494 static const AVFilterPad avfilter_af_join_outputs[] = {

495 {

496 .name = "default",

497 .type = AVMEDIA_TYPE_AUDIO,

498 .config_props = join_config_output,

499 .request_frame = join_request_frame,

500 },

501 { NULL }

502 };

503

504 AVFilter avfilter_af_join = {

505 .name = "join",

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

507 "multi-channel output."),

508 .priv_size = sizeof(JoinContext),

509 .priv_class = &join_class,

510 .init = join_init,

511 .uninit = join_uninit,

512 .query_formats = join_query_formats,

513 .inputs = NULL,

514 .outputs = avfilter_af_join_outputs,

515 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,

516 };

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