2 * Copyright (c) 2012 Nicolas George
4 * This file is part of FFmpeg.
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.
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.
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
23 * concat audio-video filter
26 #include "libavutil/avassert.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/opt.h"
31 #define FF_BUFQUEUE_SIZE 256
32 #include "bufferqueue.h"
41 unsigned nb_streams[TYPE_ALL]; /**< number of out streams of each type */
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 */
51 struct FFBufQueue queue;
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",
71 AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A|A|F},
75 AVFILTER_DEFINE_CLASS(concat);
77 static int query_formats(AVFilterContext *ctx)
79 ConcatContext *cat = ctx->priv;
80 unsigned type, nb_str, idx0 = 0, idx, str, seg;
81 AVFilterFormats *formats, *rates;
82 AVFilterChannelLayouts *layouts;
84 for (type = 0; type < TYPE_ALL; type++) {
85 nb_str = cat->nb_streams[type];
86 for (str = 0; str < nb_str; str++) {
89 /* Set the output formats */
90 formats = ff_all_formats(type);
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();
97 return AVERROR(ENOMEM);
98 ff_formats_ref(rates, &ctx->outputs[idx]->in_samplerates);
99 layouts = ff_all_channel_layouts();
101 return AVERROR(ENOMEM);
102 ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->in_channel_layouts);
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);
112 idx += ctx->nb_outputs;
121 static int config_output(AVFilterLink *outlink)
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];
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);
152 return AVERROR(EINVAL);
159 static void push_frame(AVFilterContext *ctx, unsigned in_no,
160 AVFilterBufferRef *buf)
162 ConcatContext *cat = ctx->priv;
163 unsigned out_no = in_no % ctx->nb_outputs;
164 AVFilterLink * inlink = ctx-> inputs[ in_no];
165 AVFilterLink *outlink = ctx->outputs[out_no];
166 struct concat_in *in = &cat->in[in_no];
168 buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base);
171 /* add duration to input PTS */
172 if (inlink->sample_rate)
173 /* use number of audio samples */
174 in->pts += av_rescale_q(buf->audio->nb_samples,
175 (AVRational){ 1, inlink->sample_rate },
177 else if (in->nb_frames >= 2)
178 /* use mean duration */
179 in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1);
181 buf->pts += cat->delta_ts;
182 ff_filter_frame(outlink, buf);
185 static void process_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
187 AVFilterContext *ctx = inlink->dst;
188 ConcatContext *cat = ctx->priv;
189 unsigned in_no = FF_INLINK_IDX(inlink);
191 if (in_no < cat->cur_idx) {
192 av_log(ctx, AV_LOG_ERROR, "Frame after EOF on input %s\n",
193 ctx->input_pads[in_no].name);
194 avfilter_unref_buffer(buf);
195 } else if (in_no >= cat->cur_idx + ctx->nb_outputs) {
196 ff_bufqueue_add(ctx, &cat->in[in_no].queue, buf);
198 push_frame(ctx, in_no, buf);
202 static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms,
205 AVFilterContext *ctx = inlink->dst;
206 unsigned in_no = FF_INLINK_IDX(inlink);
207 AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
209 return ff_get_video_buffer(outlink, perms, w, h);
212 static AVFilterBufferRef *get_audio_buffer(AVFilterLink *inlink, int perms,
215 AVFilterContext *ctx = inlink->dst;
216 unsigned in_no = FF_INLINK_IDX(inlink);
217 AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
219 return ff_get_audio_buffer(outlink, perms, nb_samples);
222 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
224 process_frame(inlink, buf);
225 return 0; /* enhancement: handle error return */
228 static void close_input(AVFilterContext *ctx, unsigned in_no)
230 ConcatContext *cat = ctx->priv;
232 cat->in[in_no].eof = 1;
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);
238 static void find_next_delta_ts(AVFilterContext *ctx)
240 ConcatContext *cat = ctx->priv;
241 unsigned i = cat->cur_idx;
242 unsigned imax = i + ctx->nb_outputs;
245 pts = cat->in[i++].pts;
246 for (; i < imax; i++)
247 pts = FFMAX(pts, cat->in[i].pts);
248 cat->delta_ts += pts;
251 static void send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no)
253 ConcatContext *cat = ctx->priv;
254 AVFilterLink *outlink = ctx->outputs[out_no];
255 int64_t base_pts = cat->in[in_no].pts + cat->delta_ts;
256 int64_t nb_samples, sent = 0;
257 int frame_nb_samples;
258 AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate };
259 AVFilterBufferRef *buf;
260 int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout);
264 nb_samples = av_rescale_q(cat->delta_ts - base_pts,
265 outlink->time_base, rate_tb);
266 frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */
268 frame_nb_samples = FFMIN(frame_nb_samples, nb_samples);
269 buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE, frame_nb_samples);
272 av_samples_set_silence(buf->extended_data, 0, frame_nb_samples,
273 nb_channels, outlink->format);
274 buf->pts = base_pts + av_rescale_q(sent, rate_tb, outlink->time_base);
275 ff_filter_frame(outlink, buf);
276 sent += frame_nb_samples;
277 nb_samples -= frame_nb_samples;
281 static void flush_segment(AVFilterContext *ctx)
283 ConcatContext *cat = ctx->priv;
284 unsigned str, str_max;
286 find_next_delta_ts(ctx);
287 cat->cur_idx += ctx->nb_outputs;
288 cat->nb_in_active = ctx->nb_outputs;
289 av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n",
292 if (cat->cur_idx < ctx->nb_inputs) {
293 /* pad audio streams with silence */
294 str = cat->nb_streams[AVMEDIA_TYPE_VIDEO];
295 str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO];
296 for (; str < str_max; str++)
297 send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str);
298 /* flush queued buffers */
299 /* possible enhancement: flush in PTS order */
300 str_max = cat->cur_idx + ctx->nb_outputs;
301 for (str = cat->cur_idx; str < str_max; str++)
302 while (cat->in[str].queue.available)
303 push_frame(ctx, str, ff_bufqueue_get(&cat->in[str].queue));
307 static int request_frame(AVFilterLink *outlink)
309 AVFilterContext *ctx = outlink->src;
310 ConcatContext *cat = ctx->priv;
311 unsigned out_no = FF_OUTLINK_IDX(outlink);
312 unsigned in_no = out_no + cat->cur_idx;
313 unsigned str, str_max;
317 if (in_no >= ctx->nb_inputs)
319 if (!cat->in[in_no].eof) {
320 ret = ff_request_frame(ctx->inputs[in_no]);
321 if (ret != AVERROR_EOF)
323 close_input(ctx, in_no);
325 /* cycle on all inputs to finish the segment */
326 /* possible enhancement: request in PTS order */
327 str_max = cat->cur_idx + ctx->nb_outputs - 1;
328 for (str = cat->cur_idx; cat->nb_in_active;
329 str = str == str_max ? cat->cur_idx : str + 1) {
330 if (cat->in[str].eof)
332 ret = ff_request_frame(ctx->inputs[str]);
333 if (ret == AVERROR_EOF)
334 close_input(ctx, str);
339 in_no += ctx->nb_outputs;
343 static av_cold int init(AVFilterContext *ctx, const char *args)
345 ConcatContext *cat = ctx->priv;
347 unsigned seg, type, str;
349 cat->class = &concat_class;
350 av_opt_set_defaults(cat);
351 ret = av_set_options_string(cat, args, "=", ":");
353 av_log(ctx, AV_LOG_ERROR, "Error parsing options: '%s'\n", args);
357 /* create input pads */
358 for (seg = 0; seg < cat->nb_segments; seg++) {
359 for (type = 0; type < TYPE_ALL; type++) {
360 for (str = 0; str < cat->nb_streams[type]; str++) {
363 .min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
364 .get_video_buffer = get_video_buffer,
365 .get_audio_buffer = get_audio_buffer,
366 .filter_frame = filter_frame,
368 pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str);
369 ff_insert_inpad(ctx, ctx->nb_inputs, &pad);
373 /* create output pads */
374 for (type = 0; type < TYPE_ALL; type++) {
375 for (str = 0; str < cat->nb_streams[type]; str++) {
378 .config_props = config_output,
379 .request_frame = request_frame,
381 pad.name = av_asprintf("out:%c%d", "va"[type], str);
382 ff_insert_outpad(ctx, ctx->nb_outputs, &pad);
386 cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in));
388 return AVERROR(ENOMEM);
389 cat->nb_in_active = ctx->nb_outputs;
393 static av_cold void uninit(AVFilterContext *ctx)
395 ConcatContext *cat = ctx->priv;
398 for (i = 0; i < ctx->nb_inputs; i++) {
399 av_freep(&ctx->input_pads[i].name);
400 ff_bufqueue_discard_all(&cat->in[i].queue);
402 for (i = 0; i < ctx->nb_outputs; i++)
403 av_freep(&ctx->output_pads[i].name);
407 AVFilter avfilter_avf_concat = {
409 .description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."),
412 .query_formats = query_formats,
413 .priv_size = sizeof(ConcatContext),
416 .priv_class = &concat_class,