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 }, 2, 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, A|A|F},

72 { 0 }

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

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

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

140 outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num ||

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

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

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

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

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

146 inlink->sample_aspect_ratio.num,

147 inlink->sample_aspect_ratio.den,

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

149 outlink->sample_aspect_ratio.num,

150 outlink->sample_aspect_ratio.den);

151 if (!cat->unsafe)

152 return AVERROR(EINVAL);

153 }

154 }

155

156 return 0;

157 }

158

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

160 {

161 ConcatContext *cat = ctx->priv;

162 unsigned out_no = in_no % ctx->nb_outputs;

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

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

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

166

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

168 in->pts = buf->pts;

169 in->nb_frames++;

170 /* add duration to input PTS */

171 if (inlink->sample_rate)

172 /* use number of audio samples */

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

174 (AVRational){ 1, inlink->sample_rate },

175 outlink->time_base);

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

177 /* use mean duration */

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

179

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

181 return ff_filter_frame(outlink, buf);

182 }

183

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

185 {

186 AVFilterContext *ctx = inlink->dst;

187 ConcatContext *cat = ctx->priv;

188 unsigned in_no = FF_INLINK_IDX(inlink);

189

190 if (in_no < cat->cur_idx) {

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

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

193 av_frame_free(&buf);

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

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

196 } else {

197 return push_frame(ctx, in_no, buf);

198 }

199 return 0;

200 }

201

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

203 {

204 AVFilterContext *ctx = inlink->dst;

205 unsigned in_no = FF_INLINK_IDX(inlink);

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

207

208 return ff_get_video_buffer(outlink, w, h);

209 }

210

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

212 {

213 AVFilterContext *ctx = inlink->dst;

214 unsigned in_no = FF_INLINK_IDX(inlink);

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

216

217 return ff_get_audio_buffer(outlink, nb_samples);

218 }

219

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

221 {

222 return process_frame(inlink, buf);

223 }

224

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

226 {

227 ConcatContext *cat = ctx->priv;

228

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

230 cat->nb_in_active--;

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

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

233 }

234

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

236 {

237 ConcatContext *cat = ctx->priv;

238 unsigned i = cat->cur_idx;

239 unsigned imax = i + ctx->nb_outputs;

240 int64_t pts;

241

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

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

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

245 cat->delta_ts += pts;

246 *seg_delta = pts;

247 }

248

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

250 int64_t seg_delta)

251 {

252 ConcatContext *cat = ctx->priv;

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

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

255 int64_t nb_samples, sent = 0;

256 int frame_nb_samples, ret;

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

258 AVFrame *buf;

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

260

261 if (!rate_tb.den)

262 return AVERROR_BUG;

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

264 outlink->time_base, rate_tb);

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

266 while (nb_samples) {

267 frame_nb_samples = FFMIN(frame_nb_samples, nb_samples);

268 buf = ff_get_audio_buffer(outlink, frame_nb_samples);

269 if (!buf)

270 return AVERROR(ENOMEM);

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

272 nb_channels, outlink->format);

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

274 ret = ff_filter_frame(outlink, buf);

275 if (ret < 0)

276 return ret;

277 sent += frame_nb_samples;

278 nb_samples -= frame_nb_samples;

279 }

280 return 0;

281 }

282

283 static int flush_segment(AVFilterContext *ctx)

284 {

285 int ret;

286 ConcatContext *cat = ctx->priv;

287 unsigned str, str_max;

288 int64_t seg_delta;

289

290 find_next_delta_ts(ctx, &seg_delta);

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

292 cat->nb_in_active = ctx->nb_outputs;

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

294 cat->delta_ts);

295

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

297 /* pad audio streams with silence */

298 str = cat->nb_streams[AVMEDIA_TYPE_VIDEO];

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

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

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

302 seg_delta);

303 if (ret < 0)

304 return ret;

305 }

306 /* flush queued buffers */

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

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

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

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

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

312 if (ret < 0)

313 return ret;

314 }

315 }

316 }

317 return 0;

318 }

319

320 static int request_frame(AVFilterLink *outlink)

321 {

322 AVFilterContext *ctx = outlink->src;

323 ConcatContext *cat = ctx->priv;

324 unsigned out_no = FF_OUTLINK_IDX(outlink);

325 unsigned in_no = out_no + cat->cur_idx;

326 unsigned str, str_max;

327 int ret;

328

329 while (1) {

330 if (in_no >= ctx->nb_inputs)

331 return AVERROR_EOF;

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

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

334 if (ret != AVERROR_EOF)

335 return ret;

336 close_input(ctx, in_no);

337 }

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

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

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

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

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

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

344 continue;

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

346 if (ret == AVERROR_EOF)

347 close_input(ctx, str);

348 else if (ret < 0)

349 return ret;

350 }

351 ret = flush_segment(ctx);

352 if (ret < 0)

353 return ret;

354 in_no += ctx->nb_outputs;

355 }

356 }

357

358 static av_cold int init(AVFilterContext *ctx)

359 {

360 ConcatContext *cat = ctx->priv;

361 unsigned seg, type, str;

362

363 /* create input pads */

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

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

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

367 AVFilterPad pad = {

368 .type = type,

369 .get_video_buffer = get_video_buffer,

370 .get_audio_buffer = get_audio_buffer,

371 .filter_frame = filter_frame,

372 };

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

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

375 }

376 }

377 }

378 /* create output pads */

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

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

381 AVFilterPad pad = {

382 .type = type,

383 .config_props = config_output,

384 .request_frame = request_frame,

385 };

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

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

388 }

389 }

390

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

392 if (!cat->in)

393 return AVERROR(ENOMEM);

394 cat->nb_in_active = ctx->nb_outputs;

395 return 0;

396 }

397

398 static av_cold void uninit(AVFilterContext *ctx)

399 {

400 ConcatContext *cat = ctx->priv;

401 unsigned i;

402

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

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

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

406 }

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

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

409 av_free(cat->in);

410 }

411

412 AVFilter avfilter_avf_concat = {

413 .name = "concat",

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

415 .init = init,

416 .uninit = uninit,

417 .query_formats = query_formats,

418 .priv_size = sizeof(ConcatContext),

419 .inputs = NULL,

420 .outputs = NULL,

421 .priv_class = &concat_class,

422 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,

423 };

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