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path: root/libavfilter/avf_concat.c (plain)
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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 }, 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_BOOL, { .i64 = 0 }, 0, 1, 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 int ret;
84
85 for (type = 0; type < TYPE_ALL; type++) {
86 nb_str = cat->nb_streams[type];
87 for (str = 0; str < nb_str; str++) {
88 idx = idx0;
89
90 /* Set the output formats */
91 formats = ff_all_formats(type);
92 if ((ret = ff_formats_ref(formats, &ctx->outputs[idx]->in_formats)) < 0)
93 return ret;
94
95 if (type == AVMEDIA_TYPE_AUDIO) {
96 rates = ff_all_samplerates();
97 if ((ret = ff_formats_ref(rates, &ctx->outputs[idx]->in_samplerates)) < 0)
98 return ret;
99 layouts = ff_all_channel_layouts();
100 if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->in_channel_layouts)) < 0)
101 return ret;
102 }
103
104 /* Set the same formats for each corresponding input */
105 for (seg = 0; seg < cat->nb_segments; seg++) {
106 if ((ret = ff_formats_ref(formats, &ctx->inputs[idx]->out_formats)) < 0)
107 return ret;
108 if (type == AVMEDIA_TYPE_AUDIO) {
109 if ((ret = ff_formats_ref(rates, &ctx->inputs[idx]->out_samplerates)) < 0 ||
110 (ret = ff_channel_layouts_ref(layouts, &ctx->inputs[idx]->out_channel_layouts)) < 0)
111 return ret;
112 }
113 idx += ctx->nb_outputs;
114 }
115
116 idx0++;
117 }
118 }
119 return 0;
120}
121
122static int config_output(AVFilterLink *outlink)
123{
124 AVFilterContext *ctx = outlink->src;
125 ConcatContext *cat = ctx->priv;
126 unsigned out_no = FF_OUTLINK_IDX(outlink);
127 unsigned in_no = out_no, seg;
128 AVFilterLink *inlink = ctx->inputs[in_no];
129
130 /* enhancement: find a common one */
131 outlink->time_base = AV_TIME_BASE_Q;
132 outlink->w = inlink->w;
133 outlink->h = inlink->h;
134 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
135 outlink->format = inlink->format;
136 for (seg = 1; seg < cat->nb_segments; seg++) {
137 inlink = ctx->inputs[in_no += ctx->nb_outputs];
138 if (!outlink->sample_aspect_ratio.num)
139 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
140 /* possible enhancement: unsafe mode, do not check */
141 if (outlink->w != inlink->w ||
142 outlink->h != inlink->h ||
143 outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num &&
144 inlink->sample_aspect_ratio.num ||
145 outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) {
146 av_log(ctx, AV_LOG_ERROR, "Input link %s parameters "
147 "(size %dx%d, SAR %d:%d) do not match the corresponding "
148 "output link %s parameters (%dx%d, SAR %d:%d)\n",
149 ctx->input_pads[in_no].name, inlink->w, inlink->h,
150 inlink->sample_aspect_ratio.num,
151 inlink->sample_aspect_ratio.den,
152 ctx->input_pads[out_no].name, outlink->w, outlink->h,
153 outlink->sample_aspect_ratio.num,
154 outlink->sample_aspect_ratio.den);
155 if (!cat->unsafe)
156 return AVERROR(EINVAL);
157 }
158 }
159
160 return 0;
161}
162
163static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf)
164{
165 ConcatContext *cat = ctx->priv;
166 unsigned out_no = in_no % ctx->nb_outputs;
167 AVFilterLink * inlink = ctx-> inputs[ in_no];
168 AVFilterLink *outlink = ctx->outputs[out_no];
169 struct concat_in *in = &cat->in[in_no];
170
171 buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base);
172 in->pts = buf->pts;
173 in->nb_frames++;
174 /* add duration to input PTS */
175 if (inlink->sample_rate)
176 /* use number of audio samples */
177 in->pts += av_rescale_q(buf->nb_samples,
178 av_make_q(1, inlink->sample_rate),
179 outlink->time_base);
180 else if (in->nb_frames >= 2)
181 /* use mean duration */
182 in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1);
183
184 buf->pts += cat->delta_ts;
185 return ff_filter_frame(outlink, buf);
186}
187
188static int process_frame(AVFilterLink *inlink, AVFrame *buf)
189{
190 AVFilterContext *ctx = inlink->dst;
191 ConcatContext *cat = ctx->priv;
192 unsigned in_no = FF_INLINK_IDX(inlink);
193
194 if (in_no < cat->cur_idx) {
195 av_log(ctx, AV_LOG_ERROR, "Frame after EOF on input %s\n",
196 ctx->input_pads[in_no].name);
197 av_frame_free(&buf);
198 } else if (in_no >= cat->cur_idx + ctx->nb_outputs) {
199 ff_bufqueue_add(ctx, &cat->in[in_no].queue, buf);
200 } else {
201 return push_frame(ctx, in_no, buf);
202 }
203 return 0;
204}
205
206static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
207{
208 AVFilterContext *ctx = inlink->dst;
209 unsigned in_no = FF_INLINK_IDX(inlink);
210 AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
211
212 return ff_get_video_buffer(outlink, w, h);
213}
214
215static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples)
216{
217 AVFilterContext *ctx = inlink->dst;
218 unsigned in_no = FF_INLINK_IDX(inlink);
219 AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
220
221 return ff_get_audio_buffer(outlink, nb_samples);
222}
223
224static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
225{
226 return process_frame(inlink, buf);
227}
228
229static void close_input(AVFilterContext *ctx, unsigned in_no)
230{
231 ConcatContext *cat = ctx->priv;
232
233 cat->in[in_no].eof = 1;
234 cat->nb_in_active--;
235 av_log(ctx, AV_LOG_VERBOSE, "EOF on %s, %d streams left in segment.\n",
236 ctx->input_pads[in_no].name, cat->nb_in_active);
237}
238
239static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)
240{
241 ConcatContext *cat = ctx->priv;
242 unsigned i = cat->cur_idx;
243 unsigned imax = i + ctx->nb_outputs;
244 int64_t pts;
245
246 pts = cat->in[i++].pts;
247 for (; i < imax; i++)
248 pts = FFMAX(pts, cat->in[i].pts);
249 cat->delta_ts += pts;
250 *seg_delta = pts;
251}
252
253static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no,
254 int64_t seg_delta)
255{
256 ConcatContext *cat = ctx->priv;
257 AVFilterLink *outlink = ctx->outputs[out_no];
258 int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta;
259 int64_t nb_samples, sent = 0;
260 int frame_nb_samples, ret;
261 AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate };
262 AVFrame *buf;
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 outlink->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 return ret;
351 close_input(ctx, str);
352 }
353 ret = flush_segment(ctx);
354 if (ret < 0)
355 return ret;
356 in_no += ctx->nb_outputs;
357 }
358}
359
360static av_cold int init(AVFilterContext *ctx)
361{
362 ConcatContext *cat = ctx->priv;
363 unsigned seg, type, str;
364
365 /* create input pads */
366 for (seg = 0; seg < cat->nb_segments; seg++) {
367 for (type = 0; type < TYPE_ALL; type++) {
368 for (str = 0; str < cat->nb_streams[type]; str++) {
369 AVFilterPad pad = {
370 .type = type,
371 .get_video_buffer = get_video_buffer,
372 .get_audio_buffer = get_audio_buffer,
373 .filter_frame = filter_frame,
374 };
375 pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str);
376 ff_insert_inpad(ctx, ctx->nb_inputs, &pad);
377 }
378 }
379 }
380 /* create output pads */
381 for (type = 0; type < TYPE_ALL; type++) {
382 for (str = 0; str < cat->nb_streams[type]; str++) {
383 AVFilterPad pad = {
384 .type = type,
385 .config_props = config_output,
386 .request_frame = request_frame,
387 };
388 pad.name = av_asprintf("out:%c%d", "va"[type], str);
389 ff_insert_outpad(ctx, ctx->nb_outputs, &pad);
390 }
391 }
392
393 cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in));
394 if (!cat->in)
395 return AVERROR(ENOMEM);
396 cat->nb_in_active = ctx->nb_outputs;
397 return 0;
398}
399
400static av_cold void uninit(AVFilterContext *ctx)
401{
402 ConcatContext *cat = ctx->priv;
403 unsigned i;
404
405 for (i = 0; i < ctx->nb_inputs; i++) {
406 av_freep(&ctx->input_pads[i].name);
407 ff_bufqueue_discard_all(&cat->in[i].queue);
408 }
409 for (i = 0; i < ctx->nb_outputs; i++)
410 av_freep(&ctx->output_pads[i].name);
411 av_freep(&cat->in);
412}
413
414AVFilter ff_avf_concat = {
415 .name = "concat",
416 .description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."),
417 .init = init,
418 .uninit = uninit,
419 .query_formats = query_formats,
420 .priv_size = sizeof(ConcatContext),
421 .inputs = NULL,
422 .outputs = NULL,
423 .priv_class = &concat_class,
424 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
425};
426
generated by cgit at 2024-05-17 05:47:41 (GMT)