1/* 2 * Copyright (c) 2012 Nicolas George 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 */ 20 21/** 22 * @file 23 * concat audio-video filter 24 */ 25 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" 36 37#define TYPE_ALL 2 38 39typedef 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; 54 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 59 60static 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, V|A|F}, 72 { NULL } 73}; 74 75AVFILTER_DEFINE_CLASS(concat); 76 77static 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; 83 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; 88 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 121static 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 162static 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 187static 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 205static 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 214static 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 223static int filter_frame(AVFilterLink *inlink, AVFrame *buf) 224{ 225 return process_frame(inlink, buf); 226} 227 228static 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 238static 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 252static 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 286static 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 323static 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 361static 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 401static 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_free(cat->in); 413} 414 415AVFilter 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}; 427