FFmpeg: libavfilter/avf_concat.c Source File

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libavfilter

avf_concat.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

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

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

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

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

10 *

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

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

13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

14 * See the GNU Lesser General Public License for more details.

15 *

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

17 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,

18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 /**

22 * @file

23 * concat audio-video filter

24 */

26 #include "libavutil/avassert.h"

27 #include "libavutil/avstring.h"

28 #include "libavutil/channel_layout.h"

29 #include "libavutil/opt.h"

30 #include "avfilter.h"

31 #define FF_BUFQUEUE_SIZE 256

32 #include "bufferqueue.h"

33 #include "internal.h"

34 #include "video.h"

35 #include "audio.h"

37 #define TYPE_ALL 2

39 typedef struct {

40 const AVClass *class;

41 unsigned nb_streams[TYPE_ALL]; /**< number of out streams of each type */

42 unsigned nb_segments;

43 unsigned cur_idx; /**< index of the first input of current segment */

44 int64_t delta_ts; /**< timestamp to add to produce output timestamps */

45 unsigned nb_in_active; /**< number of active inputs in current segment */

46 unsigned unsafe;

47 struct concat_in {

48 int64_t pts;

49 int64_t nb_frames;

50 unsigned eof;

51 struct FFBufQueue queue;

52 } *in;

53 } ConcatContext;

55 #define OFFSET(x) offsetof(ConcatContext, x)

56 #define A AV_OPT_FLAG_AUDIO_PARAM

57 #define F AV_OPT_FLAG_FILTERING_PARAM

58 #define V AV_OPT_FLAG_VIDEO_PARAM

60 static const AVOption concat_options[] = {

61 { "n", "specify the number of segments", OFFSET(nb_segments),

62 AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, V|A|F},

63 { "v", "specify the number of video streams",

64 OFFSET(nb_streams[AVMEDIA_TYPE_VIDEO]),

65 AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, V|F },

66 { "a", "specify the number of audio streams",

67 OFFSET(nb_streams[AVMEDIA_TYPE_AUDIO]),

68 AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A|F},

69 { "unsafe", "enable unsafe mode",

70 OFFSET(unsafe),

71 AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V|A|F},

72 { NULL }

73 };

75 AVFILTER_DEFINE_CLASS(concat);

77 static int query_formats(AVFilterContext *ctx)

78 {

79 ConcatContext *cat = ctx->priv;

80 unsigned type, nb_str, idx0 = 0, idx, str, seg;

81 AVFilterFormats *formats, *rates = NULL;

82 AVFilterChannelLayouts *layouts = NULL;

84 for (type = 0; type < TYPE_ALL; type++) {

85 nb_str = cat->nb_streams[type];

86 for (str = 0; str < nb_str; str++) {

87 idx = idx0;

89 /* Set the output formats */

90 formats = ff_all_formats(type);

91 if (!formats)

92 return AVERROR(ENOMEM);

93 ff_formats_ref(formats, &ctx->outputs[idx]->in_formats);

94 if (type == AVMEDIA_TYPE_AUDIO) {

95 rates = ff_all_samplerates();

96 if (!rates)

97 return AVERROR(ENOMEM);

98 ff_formats_ref(rates, &ctx->outputs[idx]->in_samplerates);

99 layouts = ff_all_channel_layouts();

100 if (!layouts)

101 return AVERROR(ENOMEM);

102 ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->in_channel_layouts);

103 }

104

105 /* Set the same formats for each corresponding input */

106 for (seg = 0; seg < cat->nb_segments; seg++) {

107 ff_formats_ref(formats, &ctx->inputs[idx]->out_formats);

108 if (type == AVMEDIA_TYPE_AUDIO) {

109 ff_formats_ref(rates, &ctx->inputs[idx]->out_samplerates);

110 ff_channel_layouts_ref(layouts, &ctx->inputs[idx]->out_channel_layouts);

111 }

112 idx += ctx->nb_outputs;

113 }

114

115 idx0++;

116 }

117 }

118 return 0;

119 }

120

121 static int config_output(AVFilterLink *outlink)

122 {

123 AVFilterContext *ctx = outlink->src;

124 ConcatContext *cat = ctx->priv;

125 unsigned out_no = FF_OUTLINK_IDX(outlink);

126 unsigned in_no = out_no, seg;

127 AVFilterLink *inlink = ctx->inputs[in_no];

128

129 /* enhancement: find a common one */

130 outlink->time_base = AV_TIME_BASE_Q;

131 outlink->w = inlink->w;

132 outlink->h = inlink->h;

133 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

134 outlink->format = inlink->format;

135 for (seg = 1; seg < cat->nb_segments; seg++) {

136 inlink = ctx->inputs[in_no += ctx->nb_outputs];

137 if (!outlink->sample_aspect_ratio.num)

138 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

139 /* possible enhancement: unsafe mode, do not check */

140 if (outlink->w != inlink->w ||

141 outlink->h != inlink->h ||

142 outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num &&

143 inlink->sample_aspect_ratio.num ||

144 outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) {

145 av_log(ctx, AV_LOG_ERROR, "Input link %s parameters "

146 "(size %dx%d, SAR %d:%d) do not match the corresponding "

147 "output link %s parameters (%dx%d, SAR %d:%d)\n",

148 ctx->input_pads[in_no].name, inlink->w, inlink->h,

149 inlink->sample_aspect_ratio.num,

150 inlink->sample_aspect_ratio.den,

151 ctx->input_pads[out_no].name, outlink->w, outlink->h,

152 outlink->sample_aspect_ratio.num,

153 outlink->sample_aspect_ratio.den);

154 if (!cat->unsafe)

155 return AVERROR(EINVAL);

156 }

157 }

158

159 return 0;

160 }

161

162 static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf)

163 {

164 ConcatContext *cat = ctx->priv;

165 unsigned out_no = in_no % ctx->nb_outputs;

166 AVFilterLink * inlink = ctx-> inputs[ in_no];

167 AVFilterLink *outlink = ctx->outputs[out_no];

168 struct concat_in *in = &cat->in[in_no];

169

170 buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base);

171 in->pts = buf->pts;

172 in->nb_frames++;

173 /* add duration to input PTS */

174 if (inlink->sample_rate)

175 /* use number of audio samples */

176 in->pts += av_rescale_q(buf->nb_samples,

177 av_make_q(1, inlink->sample_rate),

178 outlink->time_base);

179 else if (in->nb_frames >= 2)

180 /* use mean duration */

181 in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1);

182

183 buf->pts += cat->delta_ts;

184 return ff_filter_frame(outlink, buf);

185 }

186

187 static int process_frame(AVFilterLink *inlink, AVFrame *buf)

188 {

189 AVFilterContext *ctx = inlink->dst;

190 ConcatContext *cat = ctx->priv;

191 unsigned in_no = FF_INLINK_IDX(inlink);

192

193 if (in_no < cat->cur_idx) {

194 av_log(ctx, AV_LOG_ERROR, "Frame after EOF on input %s\n",

195 ctx->input_pads[in_no].name);

196 av_frame_free(&buf);

197 } else if (in_no >= cat->cur_idx + ctx->nb_outputs) {

198 ff_bufqueue_add(ctx, &cat->in[in_no].queue, buf);

199 } else {

200 return push_frame(ctx, in_no, buf);

201 }

202 return 0;

203 }

204

205 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)

206 {

207 AVFilterContext *ctx = inlink->dst;

208 unsigned in_no = FF_INLINK_IDX(inlink);

209 AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];

210

211 return ff_get_video_buffer(outlink, w, h);

212 }

213

214 static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples)

215 {

216 AVFilterContext *ctx = inlink->dst;

217 unsigned in_no = FF_INLINK_IDX(inlink);

218 AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];

219

220 return ff_get_audio_buffer(outlink, nb_samples);

221 }

222

223 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)

224 {

225 return process_frame(inlink, buf);

226 }

227

228 static void close_input(AVFilterContext *ctx, unsigned in_no)

229 {

230 ConcatContext *cat = ctx->priv;

231

232 cat->in[in_no].eof = 1;

233 cat->nb_in_active--;

234 av_log(ctx, AV_LOG_VERBOSE, "EOF on %s, %d streams left in segment.\n",

235 ctx->input_pads[in_no].name, cat->nb_in_active);

236 }

237

238 static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)

239 {

240 ConcatContext *cat = ctx->priv;

241 unsigned i = cat->cur_idx;

242 unsigned imax = i + ctx->nb_outputs;

243 int64_t pts;

244

245 pts = cat->in[i++].pts;

246 for (; i < imax; i++)

247 pts = FFMAX(pts, cat->in[i].pts);

248 cat->delta_ts += pts;

249 *seg_delta = pts;

250 }

251

252 static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no,

253 int64_t seg_delta)

254 {

255 ConcatContext *cat = ctx->priv;

256 AVFilterLink *outlink = ctx->outputs[out_no];

257 int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta;

258 int64_t nb_samples, sent = 0;

259 int frame_nb_samples, ret;

260 AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate };

261 AVFrame *buf;

262 int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout);

263

264 if (!rate_tb.den)

265 return AVERROR_BUG;

266 nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts,

267 outlink->time_base, rate_tb);

268 frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */

269 while (nb_samples) {

270 frame_nb_samples = FFMIN(frame_nb_samples, nb_samples);

271 buf = ff_get_audio_buffer(outlink, frame_nb_samples);

272 if (!buf)

273 return AVERROR(ENOMEM);

274 av_samples_set_silence(buf->extended_data, 0, frame_nb_samples,

275 nb_channels, outlink->format);

276 buf->pts = base_pts + av_rescale_q(sent, rate_tb, outlink->time_base);

277 ret = ff_filter_frame(outlink, buf);

278 if (ret < 0)

279 return ret;

280 sent += frame_nb_samples;

281 nb_samples -= frame_nb_samples;

282 }

283 return 0;

284 }

285

286 static int flush_segment(AVFilterContext *ctx)

287 {

288 int ret;

289 ConcatContext *cat = ctx->priv;

290 unsigned str, str_max;

291 int64_t seg_delta;

292

293 find_next_delta_ts(ctx, &seg_delta);

294 cat->cur_idx += ctx->nb_outputs;

295 cat->nb_in_active = ctx->nb_outputs;

296 av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n",

297 cat->delta_ts);

298

299 if (cat->cur_idx < ctx->nb_inputs) {

300 /* pad audio streams with silence */

301 str = cat->nb_streams[AVMEDIA_TYPE_VIDEO];

302 str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO];

303 for (; str < str_max; str++) {

304 ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str,

305 seg_delta);

306 if (ret < 0)

307 return ret;

308 }

309 /* flush queued buffers */

310 /* possible enhancement: flush in PTS order */

311 str_max = cat->cur_idx + ctx->nb_outputs;

312 for (str = cat->cur_idx; str < str_max; str++) {

313 while (cat->in[str].queue.available) {

314 ret = push_frame(ctx, str, ff_bufqueue_get(&cat->in[str].queue));

315 if (ret < 0)

316 return ret;

317 }

318 }

319 }

320 return 0;

321 }

322

323 static int request_frame(AVFilterLink *outlink)

324 {

325 AVFilterContext *ctx = outlink->src;

326 ConcatContext *cat = ctx->priv;

327 unsigned out_no = FF_OUTLINK_IDX(outlink);

328 unsigned in_no = out_no + cat->cur_idx;

329 unsigned str, str_max;

330 int ret;

331

332 while (1) {

333 if (in_no >= ctx->nb_inputs)

334 return AVERROR_EOF;

335 if (!cat->in[in_no].eof) {

336 ret = ff_request_frame(ctx->inputs[in_no]);

337 if (ret != AVERROR_EOF)

338 return ret;

339 close_input(ctx, in_no);

340 }

341 /* cycle on all inputs to finish the segment */

342 /* possible enhancement: request in PTS order */

343 str_max = cat->cur_idx + ctx->nb_outputs - 1;

344 for (str = cat->cur_idx; cat->nb_in_active;

345 str = str == str_max ? cat->cur_idx : str + 1) {

346 if (cat->in[str].eof)

347 continue;

348 ret = ff_request_frame(ctx->inputs[str]);

349 if (ret == AVERROR_EOF)

350 close_input(ctx, str);

351 else if (ret < 0)

352 return ret;

353 }

354 ret = flush_segment(ctx);

355 if (ret < 0)

356 return ret;

357 in_no += ctx->nb_outputs;

358 }

359 }

360

361 static av_cold int init(AVFilterContext *ctx)

362 {

363 ConcatContext *cat = ctx->priv;

364 unsigned seg, type, str;

365

366 /* create input pads */

367 for (seg = 0; seg < cat->nb_segments; seg++) {

368 for (type = 0; type < TYPE_ALL; type++) {

369 for (str = 0; str < cat->nb_streams[type]; str++) {

370 AVFilterPad pad = {

371 .type = type,

372 .get_video_buffer = get_video_buffer,

373 .get_audio_buffer = get_audio_buffer,

374 .filter_frame = filter_frame,

375 };

376 pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str);

377 ff_insert_inpad(ctx, ctx->nb_inputs, &pad);

378 }

379 }

380 }

381 /* create output pads */

382 for (type = 0; type < TYPE_ALL; type++) {

383 for (str = 0; str < cat->nb_streams[type]; str++) {

384 AVFilterPad pad = {

385 .type = type,

386 .config_props = config_output,

387 .request_frame = request_frame,

388 };

389 pad.name = av_asprintf("out:%c%d", "va"[type], str);

390 ff_insert_outpad(ctx, ctx->nb_outputs, &pad);

391 }

392 }

393

394 cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in));

395 if (!cat->in)

396 return AVERROR(ENOMEM);

397 cat->nb_in_active = ctx->nb_outputs;

398 return 0;

399 }

400

401 static av_cold void uninit(AVFilterContext *ctx)

402 {

403 ConcatContext *cat = ctx->priv;

404 unsigned i;

405

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

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

408 ff_bufqueue_discard_all(&cat->in[i].queue);

409 }

410 for (i = 0; i < ctx->nb_outputs; i++)

411 av_freep(&ctx->output_pads[i].name);

412 av_freep(&cat->in);

413 }

414

415 AVFilter ff_avf_concat = {

416 .name = "concat",

417 .description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."),

418 .init = init,

419 .uninit = uninit,

420 .query_formats = query_formats,

421 .priv_size = sizeof(ConcatContext),

422 .inputs = NULL,

423 .outputs = NULL,

424 .priv_class = &concat_class,

425 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,

426 };

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