2 * Copyright (c) 2008 Vitor Sessak
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. See the GNU
14 * Lesser General Public License for more details.
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
23 * memory buffer source filter
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/common.h"
28 #include "libavutil/fifo.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/samplefmt.h"
34 #include "buffersrc.h"
43 AVRational time_base; ///< time_base to set in the output link
44 AVRational frame_rate; ///< frame_rate to set in the output link
45 unsigned nb_failed_requests;
46 unsigned warning_limit;
50 enum AVPixelFormat pix_fmt;
51 AVRational pixel_aspect;
56 enum AVSampleFormat sample_fmt;
58 uint64_t channel_layout;
59 char *channel_layout_str;
62 } BufferSourceContext;
64 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
65 if (c->w != width || c->h != height || c->pix_fmt != format) {\
66 av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
69 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
70 if (c->sample_fmt != format || c->sample_rate != srate ||\
71 c->channel_layout != ch_layout) {\
72 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
73 return AVERROR(EINVAL);\
76 int av_buffersrc_add_frame(AVFilterContext *buffer_src,
77 const AVFrame *frame, int flags)
79 AVFilterBufferRef *picref;
82 if (!frame) /* NULL for EOF */
83 return av_buffersrc_add_ref(buffer_src, NULL, flags);
85 picref = avfilter_get_buffer_ref_from_frame(buffer_src->outputs[0]->type,
86 frame, AV_PERM_WRITE);
88 return AVERROR(ENOMEM);
89 ret = av_buffersrc_add_ref(buffer_src, picref, flags);
90 picref->buf->data[0] = NULL;
91 avfilter_unref_buffer(picref);
95 int av_buffersrc_write_frame(AVFilterContext *buffer_filter, const AVFrame *frame)
97 return av_buffersrc_add_frame(buffer_filter, frame, 0);
100 int av_buffersrc_add_ref(AVFilterContext *s, AVFilterBufferRef *buf, int flags)
102 BufferSourceContext *c = s->priv;
103 AVFilterBufferRef *to_free = NULL;
110 return AVERROR(EINVAL);
112 if (!av_fifo_space(c->fifo) &&
113 (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
117 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
118 switch (s->outputs[0]->type) {
119 case AVMEDIA_TYPE_VIDEO:
120 CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
122 case AVMEDIA_TYPE_AUDIO:
123 CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
127 return AVERROR(EINVAL);
130 if (!(flags & AV_BUFFERSRC_FLAG_NO_COPY))
131 to_free = buf = ff_copy_buffer_ref(s->outputs[0], buf);
135 if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
136 avfilter_unref_buffer(to_free);
139 c->nb_failed_requests = 0;
140 if (c->warning_limit &&
141 av_fifo_size(c->fifo) / sizeof(buf) >= c->warning_limit) {
142 av_log(s, AV_LOG_WARNING,
143 "%d buffers queued in %s, something may be wrong.\n",
145 (char *)av_x_if_null(s->name, s->filter->name));
146 c->warning_limit *= 10;
149 if ((flags & AV_BUFFERSRC_FLAG_PUSH))
150 if ((ret = s->output_pads[0].request_frame(s->outputs[0])) < 0)
156 #ifdef FF_API_BUFFERSRC_BUFFER
157 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
159 return av_buffersrc_add_ref(s, buf, AV_BUFFERSRC_FLAG_NO_COPY);
163 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
165 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
168 #define OFFSET(x) offsetof(BufferSourceContext, x)
169 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
170 static const AVOption buffer_options[] = {
171 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
172 { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
173 { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = FLAGS },
174 { "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, .flags = FLAGS },
175 { "pixel_aspect", NULL, OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
176 { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = FLAGS },
181 AVFILTER_DEFINE_CLASS(buffer);
183 static av_cold int init_video(AVFilterContext *ctx, const char *args)
185 BufferSourceContext *c = ctx->priv;
186 char pix_fmt_str[128], sws_param[256] = "", *colon, *equal;
189 c->class = &buffer_class;
192 av_log(ctx, AV_LOG_ERROR, "Arguments required\n");
193 return AVERROR(EINVAL);
195 colon = strchr(args, ':');
196 equal = strchr(args, '=');
197 if (equal && (!colon || equal < colon)) {
198 av_opt_set_defaults(c);
199 ret = av_set_options_string(c, args, "=", ":");
203 if ((n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
204 &c->time_base.num, &c->time_base.den,
205 &c->pixel_aspect.num, &c->pixel_aspect.den, sws_param)) < 7) {
206 av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
207 ret = AVERROR(EINVAL);
210 av_log(ctx, AV_LOG_WARNING, "Flat options syntax is deprecated, use key=value pairs\n");
212 if ((ret = ff_parse_pixel_format(&c->pix_fmt, pix_fmt_str, ctx)) < 0)
214 c->sws_param = av_strdup(sws_param);
216 ret = AVERROR(ENOMEM);
221 if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
222 ret = AVERROR(ENOMEM);
226 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",
227 c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
228 c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
229 c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
230 c->warning_limit = 100;
238 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
239 static const AVOption abuffer_options[] = {
240 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
241 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
242 { "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = FLAGS },
243 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = FLAGS },
247 AVFILTER_DEFINE_CLASS(abuffer);
249 static av_cold int init_audio(AVFilterContext *ctx, const char *args)
251 BufferSourceContext *s = ctx->priv;
254 s->class = &abuffer_class;
255 av_opt_set_defaults(s);
257 if ((ret = av_set_options_string(s, args, "=", ":")) < 0)
260 s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
261 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
262 av_log(ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n",
264 ret = AVERROR(EINVAL);
268 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
269 if (!s->channel_layout) {
270 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n",
271 s->channel_layout_str);
272 ret = AVERROR(EINVAL);
276 if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
277 ret = AVERROR(ENOMEM);
281 if (!s->time_base.num)
282 s->time_base = (AVRational){1, s->sample_rate};
284 av_log(ctx, AV_LOG_VERBOSE,
285 "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
286 s->time_base.num, s->time_base.den, s->sample_fmt_str,
287 s->sample_rate, s->channel_layout_str);
288 s->warning_limit = 100;
295 static av_cold void uninit(AVFilterContext *ctx)
297 BufferSourceContext *s = ctx->priv;
298 while (s->fifo && av_fifo_size(s->fifo)) {
299 AVFilterBufferRef *buf;
300 av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
301 avfilter_unref_buffer(buf);
303 av_fifo_free(s->fifo);
305 av_freep(&s->sws_param);
308 static int query_formats(AVFilterContext *ctx)
310 BufferSourceContext *c = ctx->priv;
311 AVFilterChannelLayouts *channel_layouts = NULL;
312 AVFilterFormats *formats = NULL;
313 AVFilterFormats *samplerates = NULL;
315 switch (ctx->outputs[0]->type) {
316 case AVMEDIA_TYPE_VIDEO:
317 ff_add_format(&formats, c->pix_fmt);
318 ff_set_common_formats(ctx, formats);
320 case AVMEDIA_TYPE_AUDIO:
321 ff_add_format(&formats, c->sample_fmt);
322 ff_set_common_formats(ctx, formats);
324 ff_add_format(&samplerates, c->sample_rate);
325 ff_set_common_samplerates(ctx, samplerates);
327 ff_add_channel_layout(&channel_layouts, c->channel_layout);
328 ff_set_common_channel_layouts(ctx, channel_layouts);
331 return AVERROR(EINVAL);
337 static int config_props(AVFilterLink *link)
339 BufferSourceContext *c = link->src->priv;
341 switch (link->type) {
342 case AVMEDIA_TYPE_VIDEO:
345 link->sample_aspect_ratio = c->pixel_aspect;
347 case AVMEDIA_TYPE_AUDIO:
350 return AVERROR(EINVAL);
353 link->time_base = c->time_base;
354 link->frame_rate = c->frame_rate;
358 static int request_frame(AVFilterLink *link)
360 BufferSourceContext *c = link->src->priv;
361 AVFilterBufferRef *buf;
364 if (!av_fifo_size(c->fifo)) {
367 c->nb_failed_requests++;
368 return AVERROR(EAGAIN);
370 av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
372 ff_filter_frame(link, buf);
377 static int poll_frame(AVFilterLink *link)
379 BufferSourceContext *c = link->src->priv;
380 int size = av_fifo_size(c->fifo);
383 return size/sizeof(AVFilterBufferRef*);
386 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
389 .type = AVMEDIA_TYPE_VIDEO,
390 .request_frame = request_frame,
391 .poll_frame = poll_frame,
392 .config_props = config_props,
397 AVFilter avfilter_vsrc_buffer = {
399 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
400 .priv_size = sizeof(BufferSourceContext),
401 .query_formats = query_formats,
407 .outputs = avfilter_vsrc_buffer_outputs,
408 .priv_class = &buffer_class,
411 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
414 .type = AVMEDIA_TYPE_AUDIO,
415 .request_frame = request_frame,
416 .poll_frame = poll_frame,
417 .config_props = config_props,
422 AVFilter avfilter_asrc_abuffer = {
424 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
425 .priv_size = sizeof(BufferSourceContext),
426 .query_formats = query_formats,
432 .outputs = avfilter_asrc_abuffer_outputs,
433 .priv_class = &abuffer_class,