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path: root/libavfilter/buffersrc.c (plain)
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1/*
2 * Copyright (c) 2008 Vitor Sessak
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. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * memory buffer source filter
24 */
25
26#include <float.h>
27
28#include "libavutil/channel_layout.h"
29#include "libavutil/common.h"
30#include "libavutil/fifo.h"
31#include "libavutil/frame.h"
32#include "libavutil/imgutils.h"
33#include "libavutil/internal.h"
34#include "libavutil/opt.h"
35#include "libavutil/samplefmt.h"
36#include "audio.h"
37#include "avfilter.h"
38#include "buffersrc.h"
39#include "formats.h"
40#include "internal.h"
41#include "video.h"
42
43typedef struct BufferSourceContext {
44 const AVClass *class;
45 AVFifoBuffer *fifo;
46 AVRational time_base; ///< time_base to set in the output link
47 AVRational frame_rate; ///< frame_rate to set in the output link
48 unsigned nb_failed_requests;
49 unsigned warning_limit;
50
51 /* video only */
52 int w, h;
53 enum AVPixelFormat pix_fmt;
54 AVRational pixel_aspect;
55 char *sws_param;
56
57 AVBufferRef *hw_frames_ctx;
58
59 /* audio only */
60 int sample_rate;
61 enum AVSampleFormat sample_fmt;
62 int channels;
63 uint64_t channel_layout;
64 char *channel_layout_str;
65
66 int got_format_from_params;
67 int eof;
68} BufferSourceContext;
69
70#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
71 if (c->w != width || c->h != height || c->pix_fmt != format) {\
72 av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
73 }
74
75#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\
76 if (c->sample_fmt != format || c->sample_rate != srate ||\
77 c->channel_layout != ch_layout || c->channels != ch_count) {\
78 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
79 return AVERROR(EINVAL);\
80 }
81
82AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)
83{
84 AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
85 if (!par)
86 return NULL;
87
88 par->format = -1;
89
90 return par;
91}
92
93int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
94{
95 BufferSourceContext *s = ctx->priv;
96
97 if (param->time_base.num > 0 && param->time_base.den > 0)
98 s->time_base = param->time_base;
99
100 switch (ctx->filter->outputs[0].type) {
101 case AVMEDIA_TYPE_VIDEO:
102 if (param->format != AV_PIX_FMT_NONE) {
103 s->got_format_from_params = 1;
104 s->pix_fmt = param->format;
105 }
106 if (param->width > 0)
107 s->w = param->width;
108 if (param->height > 0)
109 s->h = param->height;
110 if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
111 s->pixel_aspect = param->sample_aspect_ratio;
112 if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
113 s->frame_rate = param->frame_rate;
114 if (param->hw_frames_ctx) {
115 av_buffer_unref(&s->hw_frames_ctx);
116 s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);
117 if (!s->hw_frames_ctx)
118 return AVERROR(ENOMEM);
119 }
120 break;
121 case AVMEDIA_TYPE_AUDIO:
122 if (param->format != AV_SAMPLE_FMT_NONE) {
123 s->got_format_from_params = 1;
124 s->sample_fmt = param->format;
125 }
126 if (param->sample_rate > 0)
127 s->sample_rate = param->sample_rate;
128 if (param->channel_layout)
129 s->channel_layout = param->channel_layout;
130 break;
131 default:
132 return AVERROR_BUG;
133 }
134
135 return 0;
136}
137
138int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
139{
140 return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
141 AV_BUFFERSRC_FLAG_KEEP_REF);
142}
143
144int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
145{
146 return av_buffersrc_add_frame_flags(ctx, frame, 0);
147}
148
149static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
150 AVFrame *frame, int flags);
151
152int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
153{
154 AVFrame *copy = NULL;
155 int ret = 0;
156
157 if (frame && frame->channel_layout &&
158 av_get_channel_layout_nb_channels(frame->channel_layout) != av_frame_get_channels(frame)) {
159 av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
160 return AVERROR(EINVAL);
161 }
162
163 if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
164 return av_buffersrc_add_frame_internal(ctx, frame, flags);
165
166 if (!(copy = av_frame_alloc()))
167 return AVERROR(ENOMEM);
168 ret = av_frame_ref(copy, frame);
169 if (ret >= 0)
170 ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
171
172 av_frame_free(&copy);
173 return ret;
174}
175
176static int push_frame(AVFilterGraph *graph)
177{
178 int ret;
179
180 while (1) {
181 ret = ff_filter_graph_run_once(graph);
182 if (ret == AVERROR(EAGAIN))
183 break;
184 if (ret < 0)
185 return ret;
186 }
187 return 0;
188}
189
190static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
191 AVFrame *frame, int flags)
192{
193 BufferSourceContext *s = ctx->priv;
194 AVFrame *copy;
195 int refcounted, ret;
196
197 s->nb_failed_requests = 0;
198
199 if (!frame) {
200 s->eof = 1;
201 ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, AV_NOPTS_VALUE);
202 if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
203 ret = push_frame(ctx->graph);
204 if (ret < 0)
205 return ret;
206 }
207 return 0;
208 } else if (s->eof)
209 return AVERROR(EINVAL);
210
211 refcounted = !!frame->buf[0];
212
213 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
214
215 switch (ctx->outputs[0]->type) {
216 case AVMEDIA_TYPE_VIDEO:
217 CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
218 frame->format);
219 break;
220 case AVMEDIA_TYPE_AUDIO:
221 /* For layouts unknown on input but known on link after negotiation. */
222 if (!frame->channel_layout)
223 frame->channel_layout = s->channel_layout;
224 CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
225 av_frame_get_channels(frame), frame->format);
226 break;
227 default:
228 return AVERROR(EINVAL);
229 }
230
231 }
232
233 if (!av_fifo_space(s->fifo) &&
234 (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
235 sizeof(copy))) < 0)
236 return ret;
237
238 if (!(copy = av_frame_alloc()))
239 return AVERROR(ENOMEM);
240
241 if (refcounted) {
242 av_frame_move_ref(copy, frame);
243 } else {
244 ret = av_frame_ref(copy, frame);
245 if (ret < 0) {
246 av_frame_free(&copy);
247 return ret;
248 }
249 }
250
251 if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
252 if (refcounted)
253 av_frame_move_ref(frame, copy);
254 av_frame_free(&copy);
255 return ret;
256 }
257
258 if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
259 return ret;
260
261 if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
262 ret = push_frame(ctx->graph);
263 if (ret < 0)
264 return ret;
265 }
266
267 return 0;
268}
269
270static av_cold int init_video(AVFilterContext *ctx)
271{
272 BufferSourceContext *c = ctx->priv;
273
274 if (!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params) || !c->w || !c->h ||
275 av_q2d(c->time_base) <= 0) {
276 av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
277 return AVERROR(EINVAL);
278 }
279
280 if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
281 return AVERROR(ENOMEM);
282
283 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d sws_param:%s\n",
284 c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
285 c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
286 c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
287 c->warning_limit = 100;
288 return 0;
289}
290
291unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
292{
293 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
294}
295
296#define OFFSET(x) offsetof(BufferSourceContext, x)
297#define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
298#define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
299
300static const AVOption buffer_options[] = {
301 { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
302 { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
303 { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
304 { "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, { .i64 = AV_PIX_FMT_NONE }, .min = AV_PIX_FMT_NONE, .max = INT_MAX, .flags = V },
305#if FF_API_OLD_FILTER_OPTS
306 /* those 4 are for compatibility with the old option passing system where each filter
307 * did its own parsing */
308 { "time_base_num", "deprecated, do not use", OFFSET(time_base.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
309 { "time_base_den", "deprecated, do not use", OFFSET(time_base.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
310 { "sar_num", "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
311 { "sar_den", "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
312#endif
313 { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
314 { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
315 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
316 { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
317 { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
318 { NULL },
319};
320
321AVFILTER_DEFINE_CLASS(buffer);
322
323static const AVOption abuffer_options[] = {
324 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
325 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
326 { "sample_fmt", NULL, OFFSET(sample_fmt), AV_OPT_TYPE_SAMPLE_FMT, { .i64 = AV_SAMPLE_FMT_NONE }, .min = AV_SAMPLE_FMT_NONE, .max = INT_MAX, .flags = A },
327 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
328 { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
329 { NULL },
330};
331
332AVFILTER_DEFINE_CLASS(abuffer);
333
334static av_cold int init_audio(AVFilterContext *ctx)
335{
336 BufferSourceContext *s = ctx->priv;
337 int ret = 0;
338
339 if (!(s->sample_fmt != AV_SAMPLE_FMT_NONE || s->got_format_from_params)) {
340 av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
341 return AVERROR(EINVAL);
342 }
343
344 if (s->channel_layout_str || s->channel_layout) {
345 int n;
346
347 if (!s->channel_layout) {
348 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
349 if (!s->channel_layout) {
350 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
351 s->channel_layout_str);
352 return AVERROR(EINVAL);
353 }
354 }
355 n = av_get_channel_layout_nb_channels(s->channel_layout);
356 if (s->channels) {
357 if (n != s->channels) {
358 av_log(ctx, AV_LOG_ERROR,
359 "Mismatching channel count %d and layout '%s' "
360 "(%d channels)\n",
361 s->channels, s->channel_layout_str, n);
362 return AVERROR(EINVAL);
363 }
364 }
365 s->channels = n;
366 } else if (!s->channels) {
367 av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
368 "channel layout specified\n");
369 return AVERROR(EINVAL);
370 }
371
372 if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
373 return AVERROR(ENOMEM);
374
375 if (!s->time_base.num)
376 s->time_base = (AVRational){1, s->sample_rate};
377
378 av_log(ctx, AV_LOG_VERBOSE,
379 "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
380 s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
381 s->sample_rate, s->channel_layout_str);
382 s->warning_limit = 100;
383
384 return ret;
385}
386
387static av_cold void uninit(AVFilterContext *ctx)
388{
389 BufferSourceContext *s = ctx->priv;
390 while (s->fifo && av_fifo_size(s->fifo)) {
391 AVFrame *frame;
392 av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
393 av_frame_free(&frame);
394 }
395 av_buffer_unref(&s->hw_frames_ctx);
396 av_fifo_freep(&s->fifo);
397}
398
399static int query_formats(AVFilterContext *ctx)
400{
401 BufferSourceContext *c = ctx->priv;
402 AVFilterChannelLayouts *channel_layouts = NULL;
403 AVFilterFormats *formats = NULL;
404 AVFilterFormats *samplerates = NULL;
405 int ret;
406
407 switch (ctx->outputs[0]->type) {
408 case AVMEDIA_TYPE_VIDEO:
409 if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
410 (ret = ff_set_common_formats (ctx , formats )) < 0)
411 return ret;
412 break;
413 case AVMEDIA_TYPE_AUDIO:
414 if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
415 (ret = ff_set_common_formats (ctx , formats )) < 0 ||
416 (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
417 (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
418 return ret;
419
420 if ((ret = ff_add_channel_layout(&channel_layouts,
421 c->channel_layout ? c->channel_layout :
422 FF_COUNT2LAYOUT(c->channels))) < 0)
423 return ret;
424 if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
425 return ret;
426 break;
427 default:
428 return AVERROR(EINVAL);
429 }
430
431 return 0;
432}
433
434static int config_props(AVFilterLink *link)
435{
436 BufferSourceContext *c = link->src->priv;
437
438 switch (link->type) {
439 case AVMEDIA_TYPE_VIDEO:
440 link->w = c->w;
441 link->h = c->h;
442 link->sample_aspect_ratio = c->pixel_aspect;
443
444 if (c->hw_frames_ctx) {
445 link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
446 if (!link->hw_frames_ctx)
447 return AVERROR(ENOMEM);
448 }
449 break;
450 case AVMEDIA_TYPE_AUDIO:
451 if (!c->channel_layout)
452 c->channel_layout = link->channel_layout;
453 break;
454 default:
455 return AVERROR(EINVAL);
456 }
457
458 link->time_base = c->time_base;
459 link->frame_rate = c->frame_rate;
460 return 0;
461}
462
463static int request_frame(AVFilterLink *link)
464{
465 BufferSourceContext *c = link->src->priv;
466 AVFrame *frame;
467 int ret;
468
469 if (!av_fifo_size(c->fifo)) {
470 if (c->eof)
471 return AVERROR_EOF;
472 c->nb_failed_requests++;
473 return AVERROR(EAGAIN);
474 }
475 av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
476
477 ret = ff_filter_frame(link, frame);
478
479 return ret;
480}
481
482static int poll_frame(AVFilterLink *link)
483{
484 BufferSourceContext *c = link->src->priv;
485 int size = av_fifo_size(c->fifo);
486 if (!size && c->eof)
487 return AVERROR_EOF;
488 return size/sizeof(AVFrame*);
489}
490
491static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
492 {
493 .name = "default",
494 .type = AVMEDIA_TYPE_VIDEO,
495 .request_frame = request_frame,
496 .poll_frame = poll_frame,
497 .config_props = config_props,
498 },
499 { NULL }
500};
501
502AVFilter ff_vsrc_buffer = {
503 .name = "buffer",
504 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
505 .priv_size = sizeof(BufferSourceContext),
506 .query_formats = query_formats,
507
508 .init = init_video,
509 .uninit = uninit,
510
511 .inputs = NULL,
512 .outputs = avfilter_vsrc_buffer_outputs,
513 .priv_class = &buffer_class,
514};
515
516static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
517 {
518 .name = "default",
519 .type = AVMEDIA_TYPE_AUDIO,
520 .request_frame = request_frame,
521 .poll_frame = poll_frame,
522 .config_props = config_props,
523 },
524 { NULL }
525};
526
527AVFilter ff_asrc_abuffer = {
528 .name = "abuffer",
529 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
530 .priv_size = sizeof(BufferSourceContext),
531 .query_formats = query_formats,
532
533 .init = init_audio,
534 .uninit = uninit,
535
536 .inputs = NULL,
537 .outputs = avfilter_asrc_abuffer_outputs,
538 .priv_class = &abuffer_class,
539};
540
generated by cgit at 2024-05-17 20:23:34 (GMT)