FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/af_join.c
Date: 2024-07-24 19:24:46
Exec Total Coverage
Lines: 193 288 67.0%
Functions: 11 11 100.0%
Branches: 113 196 57.7%

Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * Audio join filter
22 *
23 * Join multiple audio inputs as different channels in
24 * a single output
25 */
26
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/common.h"
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33
34 #include "audio.h"
35 #include "avfilter.h"
36 #include "formats.h"
37 #include "filters.h"
38 #include "internal.h"
39
40 typedef struct ChannelMap {
41 int input; ///< input stream index
42 int in_channel_idx; ///< index of in_channel in the input stream data
43 enum AVChannel in_channel;
44 enum AVChannel out_channel;
45 } ChannelMap;
46
47 typedef struct JoinContext {
48 const AVClass *class;
49
50 int inputs;
51 char *map;
52 AVChannelLayout ch_layout;
53
54 int64_t eof_pts;
55 int eof;
56
57 ChannelMap *channels;
58
59 /**
60 * Temporary storage for input frames, until we get one on each input.
61 */
62 AVFrame **input_frames;
63
64 /**
65 * Temporary storage for buffer references, for assembling the output frame.
66 */
67 AVBufferRef **buffers;
68 } JoinContext;
69
70 #define OFFSET(x) offsetof(JoinContext, x)
71 #define A AV_OPT_FLAG_AUDIO_PARAM
72 #define F AV_OPT_FLAG_FILTERING_PARAM
73 static const AVOption join_options[] = {
74 { "inputs", "Number of input streams.", OFFSET(inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, A|F },
75 { "channel_layout", "Channel layout of the "
76 "output stream.", OFFSET(ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = "stereo"}, 0, 0, A|F },
77 { "map", "A comma-separated list of channels maps in the format "
78 "'input_stream.input_channel-output_channel.",
79 OFFSET(map), AV_OPT_TYPE_STRING, .flags = A|F },
80 { NULL }
81 };
82
83 #define MAP_SEPARATOR '|'
84
85 AVFILTER_DEFINE_CLASS(join);
86
87 2 static int parse_maps(AVFilterContext *ctx)
88 {
89 2 JoinContext *s = ctx->priv;
90 2 char *cur = s->map;
91
92
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2 while (cur && *cur) {
93 ChannelMap *map;
94 char *sep, *next, *p;
95 int input_idx, out_ch_idx;
96
97 next = strchr(cur, MAP_SEPARATOR);
98 if (next)
99 *next++ = 0;
100
101 /* split the map into input and output parts */
102 if (!(sep = strchr(cur, '-'))) {
103 av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "
104 "map '%s'\n", cur);
105 return AVERROR(EINVAL);
106 }
107 *sep++ = 0;
108
109 /* parse output channel */
110 out_ch_idx = av_channel_layout_index_from_string(&s->ch_layout, sep);
111 if (out_ch_idx < 0) {
112 av_log(ctx, AV_LOG_ERROR, "Invalid output channel: %s.\n", sep);
113 return AVERROR(EINVAL);
114 }
115
116 map = &s->channels[out_ch_idx];
117
118 if (map->input >= 0) {
119 av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "
120 "'%s'.\n", sep);
121 return AVERROR(EINVAL);
122 }
123
124 /* parse input channel */
125 input_idx = strtol(cur, &cur, 0);
126 if (input_idx < 0 || input_idx >= s->inputs) {
127 av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",
128 input_idx);
129 return AVERROR(EINVAL);
130 }
131
132 if (*cur)
133 cur++;
134
135 map->input = input_idx;
136 map->in_channel = AV_CHAN_NONE;
137 map->in_channel_idx = strtol(cur, &p, 0);
138 if (p == cur) {
139 /* channel specifier is not a number, handle as channel name */
140 map->in_channel = av_channel_from_string(cur);
141 if (map->in_channel < 0) {
142 av_log(ctx, AV_LOG_ERROR, "Invalid input channel: %s.\n", cur);
143 return AVERROR(EINVAL);
144 }
145 } else if (map->in_channel_idx < 0) {
146 av_log(ctx, AV_LOG_ERROR, "Invalid input channel index: %d\n", map->in_channel_idx);
147 return AVERROR(EINVAL);
148 }
149
150 cur = next;
151 }
152 2 return 0;
153 }
154
155 2 static av_cold int join_init(AVFilterContext *ctx)
156 {
157 2 JoinContext *s = ctx->priv;
158 int ret, i;
159
160 2 s->channels = av_calloc(s->ch_layout.nb_channels, sizeof(*s->channels));
161 2 s->buffers = av_calloc(s->ch_layout.nb_channels, sizeof(*s->buffers));
162 2 s->input_frames = av_calloc(s->inputs, sizeof(*s->input_frames));
163
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2 if (!s->channels || !s->buffers|| !s->input_frames)
164 return AVERROR(ENOMEM);
165
166
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12 for (i = 0; i < s->ch_layout.nb_channels; i++) {
167 10 s->channels[i].out_channel = av_channel_layout_channel_from_index(&s->ch_layout, i);
168 10 s->channels[i].input = -1;
169 10 s->channels[i].in_channel_idx = -1;
170 10 s->channels[i].in_channel = AV_CHAN_NONE;
171 }
172
173
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2 if ((ret = parse_maps(ctx)) < 0)
174 return ret;
175
176
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6 for (i = 0; i < s->inputs; i++) {
177 4 AVFilterPad pad = { 0 };
178
179 4 pad.type = AVMEDIA_TYPE_AUDIO;
180 4 pad.name = av_asprintf("input%d", i);
181
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4 if (!pad.name)
182 return AVERROR(ENOMEM);
183
184
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4 if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
185 return ret;
186 }
187
188 2 return 0;
189 }
190
191 2 static av_cold void join_uninit(AVFilterContext *ctx)
192 {
193 2 JoinContext *s = ctx->priv;
194 int i;
195
196
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6 for (i = 0; i < s->inputs && s->input_frames; i++) {
197 4 av_frame_free(&s->input_frames[i]);
198 }
199
200 2 av_freep(&s->channels);
201 2 av_freep(&s->buffers);
202 2 av_freep(&s->input_frames);
203 2 }
204
205 1 static int join_query_formats(AVFilterContext *ctx)
206 {
207 1 JoinContext *s = ctx->priv;
208 1 AVFilterChannelLayouts *layouts = NULL;
209 int i, ret;
210
211
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2 if ((ret = ff_add_channel_layout(&layouts, &s->ch_layout)) < 0 ||
212 1 (ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
213 return ret;
214
215
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3 for (i = 0; i < ctx->nb_inputs; i++) {
216 2 layouts = ff_all_channel_layouts();
217
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2 if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
218 return ret;
219 }
220
221
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2 if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
222 1 (ret = ff_set_common_all_samplerates(ctx)) < 0)
223 return ret;
224
225 1 return 0;
226 }
227
228 typedef struct ChannelList {
229 enum AVChannel *ch;
230 int nb_ch;
231 } ChannelList;
232
233 5 static enum AVChannel channel_list_pop(ChannelList *chl, int idx)
234 {
235 5 enum AVChannel ret = chl->ch[idx];
236 5 memmove(chl->ch + idx, chl->ch + idx + 1,
237 5 (chl->nb_ch - idx - 1) * sizeof(*chl->ch));
238 5 chl->nb_ch--;
239 5 return ret;
240 }
241
242 /*
243 * If ch is present in chl, remove it from the list and return it.
244 * Otherwise return AV_CHAN_NONE.
245 */
246 8 static enum AVChannel channel_list_pop_ch(ChannelList *chl, enum AVChannel ch)
247 {
248
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17 for (int i = 0; i < chl->nb_ch; i++)
249
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11 if (chl->ch[i] == ch)
250 2 return channel_list_pop(chl, i);
251 6 return AV_CHAN_NONE;
252 }
253
254 5 static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch,
255 ChannelList *inputs)
256 {
257 int i;
258
259
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11 for (i = 0; i < ctx->nb_inputs; i++) {
260
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8 if (channel_list_pop_ch(&inputs[i], ch->out_channel) != AV_CHAN_NONE) {
261 2 ch->input = i;
262 2 ch->in_channel = ch->out_channel;
263 2 return;
264 }
265 }
266 }
267
268 3 static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch,
269 ChannelList *inputs)
270 {
271 int i;
272
273
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6 for (i = 0; i < ctx->nb_inputs; i++) {
274
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6 if (inputs[i].nb_ch) {
275 3 ch->input = i;
276 3 ch->in_channel = channel_list_pop(&inputs[i], 0);
277 3 return;
278 }
279 }
280 }
281
282 1 static int join_config_output(AVFilterLink *outlink)
283 {
284 1 AVFilterContext *ctx = outlink->src;
285 1 JoinContext *s = ctx->priv;
286 // unused channels from each input
287 ChannelList *inputs_unused;
288 char inbuf[64], outbuf[64];
289 1 int i, ret = 0;
290
291 /* initialize unused channel list for each input */
292 1 inputs_unused = av_calloc(ctx->nb_inputs, sizeof(*inputs_unused));
293
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1 if (!inputs_unused)
294 return AVERROR(ENOMEM);
295
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3 for (i = 0; i < ctx->nb_inputs; i++) {
296 2 AVFilterLink *inlink = ctx->inputs[i];
297 2 AVChannelLayout *chl = &inlink->ch_layout;
298 2 ChannelList *iu = &inputs_unused[i];
299
300 2 iu->nb_ch = chl->nb_channels;
301 2 iu->ch = av_malloc_array(iu->nb_ch, sizeof(*iu->ch));
302
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2 if (!iu->ch) {
303 ret = AVERROR(ENOMEM);
304 goto fail;
305 }
306
307
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7 for (int ch_idx = 0; ch_idx < iu->nb_ch; ch_idx++) {
308 5 iu->ch[ch_idx] = av_channel_layout_channel_from_index(chl, ch_idx);
309
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5 if (iu->ch[ch_idx] < 0) {
310 /* no channel ordering information in this input,
311 * so don't auto-map from it */
312 iu->nb_ch = 0;
313 break;
314 }
315 }
316 }
317
318 /* process user-specified maps */
319
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6 for (i = 0; i < s->ch_layout.nb_channels; i++) {
320 5 ChannelMap *ch = &s->channels[i];
321 AVFilterLink *inlink;
322 AVChannelLayout *ichl;
323 ChannelList *iu;
324
325
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5 if (ch->input < 0)
326 5 continue;
327
328 inlink = ctx->inputs[ch->input];
329 ichl = &inlink->ch_layout;
330 iu = &inputs_unused[ch->input];
331
332 /* get the index for the channels defined by name */
333 if (ch->in_channel != AV_CHAN_NONE) {
334 ch->in_channel_idx = av_channel_layout_index_from_channel(ichl, ch->in_channel);
335 if (ch->in_channel_idx < 0) {
336 av_channel_name(inbuf, sizeof(inbuf), ch->in_channel);
337 av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "
338 "input stream #%d.\n", inbuf,
339 ch->input);
340 ret = AVERROR(EINVAL);
341 goto fail;
342 }
343 }
344
345 /* make sure channels specified by index actually exist */
346 if (ch->in_channel_idx >= ichl->nb_channels) {
347 av_log(ctx, AV_LOG_ERROR, "Requested channel with index %d is not "
348 "present in input stream #%d.\n", ch->in_channel_idx, ch->input);
349 ret = AVERROR(EINVAL);
350 goto fail;
351 }
352
353 channel_list_pop_ch(iu, av_channel_layout_channel_from_index(ichl, ch->in_channel_idx));
354 }
355
356 /* guess channel maps when not explicitly defined */
357 /* first try unused matching channels */
358
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6 for (i = 0; i < s->ch_layout.nb_channels; i++) {
359 5 ChannelMap *ch = &s->channels[i];
360
361
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5 if (ch->input < 0)
362 5 guess_map_matching(ctx, ch, inputs_unused);
363 }
364
365 /* if the above failed, try to find _any_ unused input channel */
366
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6 for (i = 0; i < s->ch_layout.nb_channels; i++) {
367 5 ChannelMap *ch = &s->channels[i];
368
369
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5 if (ch->input < 0)
370 3 guess_map_any(ctx, ch, inputs_unused);
371
372
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5 if (ch->input < 0) {
373 av_channel_name(outbuf, sizeof(outbuf), ch->out_channel);
374 av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "
375 "output channel '%s'.\n",
376 outbuf);
377 ret = AVERROR(EINVAL);
378 goto fail;
379 }
380
381
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5 if (ch->in_channel != AV_CHAN_NONE) {
382 5 ch->in_channel_idx = av_channel_layout_index_from_channel(
383 5 &ctx->inputs[ch->input]->ch_layout, ch->in_channel);
384 }
385
386
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5 av_assert0(ch->in_channel_idx >= 0);
387 }
388
389 /* print mappings */
390 1 av_log(ctx, AV_LOG_VERBOSE, "mappings: ");
391
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6 for (i = 0; i < s->ch_layout.nb_channels; i++) {
392 5 ChannelMap *ch = &s->channels[i];
393 5 AVFilterLink *inlink = ctx->inputs[ch->input];
394 5 AVChannelLayout *ichl = &inlink->ch_layout;
395 5 enum AVChannel in_ch = av_channel_layout_channel_from_index(
396 5 ichl, ch->in_channel_idx);
397
398 5 av_channel_name(inbuf, sizeof(inbuf), in_ch);
399 5 av_channel_name(outbuf, sizeof(outbuf), ch->out_channel);
400 5 av_log(ctx, AV_LOG_VERBOSE, "%d.%s(%d) => %s(%d) ", ch->input,
401 inbuf, ch->in_channel_idx,
402 outbuf, i);
403 }
404 1 av_log(ctx, AV_LOG_VERBOSE, "\n");
405
406
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3 for (i = 0; i < ctx->nb_inputs; i++) {
407
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2 if (inputs_unused[i].nb_ch == ctx->inputs[i]->ch_layout.nb_channels)
408 av_log(ctx, AV_LOG_WARNING, "No channels are used from input "
409 "stream %d.\n", i);
410 }
411
412 1 fail:
413
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3 for (i = 0; i < ctx->nb_inputs; i++)
414 2 av_freep(&inputs_unused[i].ch);
415 1 av_freep(&inputs_unused);
416 1 return ret;
417 }
418
419 66 static int try_push_frame(AVFilterContext *ctx)
420 {
421 66 AVFilterLink *outlink = ctx->outputs[0];
422 66 JoinContext *s = ctx->priv;
423 AVFrame *frame;
424 66 int linesize = INT_MAX;
425 66 int nb_samples = INT_MAX;
426 66 int nb_buffers = 0;
427 int i, j, ret;
428
429
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196 for (i = 0; i < ctx->nb_inputs; i++) {
430
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131 if (!s->input_frames[i]) {
431 1 nb_samples = 0;
432 1 break;
433 } else {
434 130 nb_samples = FFMIN(nb_samples, s->input_frames[i]->nb_samples);
435 }
436 }
437
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66 if (!nb_samples)
438 1 goto eof;
439
440 /* setup the output frame */
441 65 frame = av_frame_alloc();
442
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65 if (!frame)
443 return AVERROR(ENOMEM);
444
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65 if (s->ch_layout.nb_channels > FF_ARRAY_ELEMS(frame->data)) {
445 frame->extended_data = av_calloc(s->ch_layout.nb_channels,
446 sizeof(*frame->extended_data));
447 if (!frame->extended_data) {
448 ret = AVERROR(ENOMEM);
449 goto fail;
450 }
451 }
452
453 /* copy the data pointers */
454
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390 for (i = 0; i < s->ch_layout.nb_channels; i++) {
455 325 ChannelMap *ch = &s->channels[i];
456 325 AVFrame *cur = s->input_frames[ch->input];
457 AVBufferRef *buf;
458
459 325 frame->extended_data[i] = cur->extended_data[ch->in_channel_idx];
460 325 linesize = FFMIN(linesize, cur->linesize[0]);
461
462 /* add the buffer where this plan is stored to the list if it's
463 * not already there */
464 325 buf = av_frame_get_plane_buffer(cur, ch->in_channel_idx);
465
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325 if (!buf) {
466 ret = AVERROR(EINVAL);
467 goto fail;
468 }
469
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975 for (j = 0; j < nb_buffers; j++)
470
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650 if (s->buffers[j]->buffer == buf->buffer)
471 break;
472
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325 if (j == i)
473 325 s->buffers[nb_buffers++] = buf;
474 }
475
476 /* create references to the buffers we copied to output */
477
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65 if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {
478 frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);
479 frame->extended_buf = av_calloc(frame->nb_extended_buf,
480 sizeof(*frame->extended_buf));
481 if (!frame->extended_buf) {
482 frame->nb_extended_buf = 0;
483 ret = AVERROR(ENOMEM);
484 goto fail;
485 }
486 }
487
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390 for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {
488 325 frame->buf[i] = av_buffer_ref(s->buffers[i]);
489
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325 if (!frame->buf[i]) {
490 ret = AVERROR(ENOMEM);
491 goto fail;
492 }
493 }
494
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65 for (i = 0; i < frame->nb_extended_buf; i++) {
495 frame->extended_buf[i] = av_buffer_ref(s->buffers[i +
496 FF_ARRAY_ELEMS(frame->buf)]);
497 if (!frame->extended_buf[i]) {
498 ret = AVERROR(ENOMEM);
499 goto fail;
500 }
501 }
502
503 65 frame->nb_samples = nb_samples;
504 65 frame->duration = av_rescale_q(frame->nb_samples,
505 av_make_q(1, outlink->sample_rate),
506 outlink->time_base);
507
508
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65 if ((ret = av_channel_layout_copy(&frame->ch_layout, &outlink->ch_layout)) < 0)
509 goto fail;
510 65 frame->sample_rate = outlink->sample_rate;
511 65 frame->format = outlink->format;
512 65 frame->pts = s->input_frames[0]->pts;
513 65 frame->linesize[0] = linesize;
514
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65 if (frame->data != frame->extended_data) {
515 memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *
516 FFMIN(FF_ARRAY_ELEMS(frame->data), s->ch_layout.nb_channels));
517 }
518
519 65 s->eof_pts = frame->pts + av_rescale_q(frame->nb_samples,
520 av_make_q(1, outlink->sample_rate),
521 outlink->time_base);
522 65 ret = ff_filter_frame(outlink, frame);
523
524
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195 for (i = 0; i < ctx->nb_inputs; i++)
525 130 av_frame_free(&s->input_frames[i]);
526
527 65 return ret;
528
529 fail:
530 av_frame_free(&frame);
531 return ret;
532 1 eof:
533
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1 for (i = 0; i < ctx->nb_inputs; i++) {
534
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2 if (s->eof &&
535 1 ff_inlink_queued_samples(ctx->inputs[i]) <= 0 &&
536
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1 !s->input_frames[i]) {
537 1 ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts);
538 1 break;
539 }
540 }
541
542 1 return 0;
543 }
544
545 196 static int activate(AVFilterContext *ctx)
546 {
547 196 JoinContext *s = ctx->priv;
548 int i, ret, status;
549 196 int nb_samples = 0;
550 int64_t pts;
551
552
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196 FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
553
554
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196 if (!s->input_frames[0]) {
555 156 ret = ff_inlink_consume_frame(ctx->inputs[0], &s->input_frames[0]);
556
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156 if (ret < 0) {
557 return ret;
558
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156 } else if (ret == 0 && ff_inlink_acknowledge_status(ctx->inputs[0], &status, &pts)) {
559 1 s->eof |= status == AVERROR_EOF;
560 }
561
562
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156 if (!s->eof && !s->input_frames[0] && ff_outlink_frame_wanted(ctx->outputs[0])) {
563 90 ff_inlink_request_frame(ctx->inputs[0]);
564 90 return 0;
565 }
566 }
567
568
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106 if (s->input_frames[0])
569 105 nb_samples = s->input_frames[0]->nb_samples;
570
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171 for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
572
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105 if (s->input_frames[i])
573 continue;
574 105 ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &s->input_frames[i]);
575
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105 if (ret < 0) {
576 return ret;
577
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105 } else if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
578 s->eof |= status == AVERROR_EOF;
579 }
580
581
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105 if (!s->eof && !s->input_frames[i]) {
582 40 ff_inlink_request_frame(ctx->inputs[i]);
583 40 return 0;
584 }
585 }
586
587 66 return try_push_frame(ctx);
588 }
589
590 static const AVFilterPad avfilter_af_join_outputs[] = {
591 {
592 .name = "default",
593 .type = AVMEDIA_TYPE_AUDIO,
594 .config_props = join_config_output,
595 },
596 };
597
598 const AVFilter ff_af_join = {
599 .name = "join",
600 .description = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "
601 "multi-channel output."),
602 .priv_size = sizeof(JoinContext),
603 .priv_class = &join_class,
604 .init = join_init,
605 .uninit = join_uninit,
606 .activate = activate,
607 .inputs = NULL,
608 FILTER_OUTPUTS(avfilter_af_join_outputs),
609 FILTER_QUERY_FUNC(join_query_formats),
610 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
611 };
612