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
28 #include "buffersrc.h"
34 #include "libavutil/audioconvert.h"
35 #include "libavutil/common.h"
36 #include "libavutil/fifo.h"
37 #include "libavutil/imgutils.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/samplefmt.h"
44 AVRational time_base; ///< time_base to set in the output link
45 AVRational frame_rate; ///< frame_rate to set in the output link
46 unsigned nb_failed_requests;
47 unsigned warning_limit;
51 enum PixelFormat pix_fmt;
52 AVRational pixel_aspect;
57 enum AVSampleFormat sample_fmt;
59 uint64_t channel_layout;
60 char *channel_layout_str;
63 } BufferSourceContext;
65 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
66 if (c->w != width || c->h != height || c->pix_fmt != format) {\
67 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
68 return AVERROR(EINVAL);\
71 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
72 if (c->sample_fmt != format || c->sample_rate != srate ||\
73 c->channel_layout != ch_layout) {\
74 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
75 return AVERROR(EINVAL);\
78 int av_buffersrc_add_frame(AVFilterContext *buffer_src,
79 const AVFrame *frame, int flags)
81 AVFilterBufferRef *picref;
84 if (!frame) /* NULL for EOF */
85 return av_buffersrc_add_ref(buffer_src, NULL, flags);
87 picref = avfilter_get_buffer_ref_from_frame(buffer_src->outputs[0]->type,
88 frame, AV_PERM_WRITE);
90 return AVERROR(ENOMEM);
91 ret = av_buffersrc_add_ref(buffer_src, picref, flags);
92 picref->buf->data[0] = NULL;
93 avfilter_unref_buffer(picref);
97 int av_buffersrc_write_frame(AVFilterContext *buffer_filter, const AVFrame *frame)
99 return av_buffersrc_add_frame(buffer_filter, frame, 0);
102 int av_buffersrc_add_ref(AVFilterContext *s, AVFilterBufferRef *buf, int flags)
104 BufferSourceContext *c = s->priv;
105 AVFilterBufferRef *to_free = NULL;
112 return AVERROR(EINVAL);
114 if (!av_fifo_space(c->fifo) &&
115 (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
119 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
120 switch (s->outputs[0]->type) {
121 case AVMEDIA_TYPE_VIDEO:
122 CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
124 case AVMEDIA_TYPE_AUDIO:
125 CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
129 return AVERROR(EINVAL);
132 if (!(flags & AV_BUFFERSRC_FLAG_NO_COPY))
133 to_free = buf = ff_copy_buffer_ref(s->outputs[0], buf);
137 if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
138 avfilter_unref_buffer(to_free);
141 c->nb_failed_requests = 0;
142 if (c->warning_limit &&
143 av_fifo_size(c->fifo) / sizeof(buf) >= c->warning_limit) {
144 av_log(s, AV_LOG_WARNING,
145 "%d buffers queued in %s, something may be wrong.\n",
147 (char *)av_x_if_null(s->name, s->filter->name));
148 c->warning_limit *= 10;
151 if ((flags & AV_BUFFERSRC_FLAG_PUSH))
152 if ((ret = s->output_pads[0].request_frame(s->outputs[0])) < 0)
158 #ifdef FF_API_BUFFERSRC_BUFFER
159 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
161 return av_buffersrc_add_ref(s, buf, AV_BUFFERSRC_FLAG_NO_COPY);
165 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
167 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
170 #define OFFSET(x) offsetof(BufferSourceContext, x)
171 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
172 static const AVOption buffer_options[] = {
173 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
174 { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
175 { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = FLAGS },
176 { "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, .flags = FLAGS },
177 { "pixel_aspect", NULL, OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
178 { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = FLAGS },
183 AVFILTER_DEFINE_CLASS(buffer);
185 static av_cold int init_video(AVFilterContext *ctx, const char *args)
187 BufferSourceContext *c = ctx->priv;
188 char pix_fmt_str[128], sws_param[256] = "", *colon, *equal;
191 c->class = &buffer_class;
194 av_log(ctx, AV_LOG_ERROR, "Arguments required\n");
195 return AVERROR(EINVAL);
197 colon = strchr(args, ':');
198 equal = strchr(args, '=');
199 if (equal && (!colon || equal < colon)) {
200 av_opt_set_defaults(c);
201 ret = av_set_options_string(c, args, "=", ":");
205 if ((n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
206 &c->time_base.num, &c->time_base.den,
207 &c->pixel_aspect.num, &c->pixel_aspect.den, sws_param)) < 7) {
208 av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
209 ret = AVERROR(EINVAL);
212 av_log(ctx, AV_LOG_WARNING, "Flat options syntax is deprecated, use key=value pairs\n");
214 if ((ret = ff_parse_pixel_format(&c->pix_fmt, pix_fmt_str, ctx)) < 0)
216 c->sws_param = av_strdup(sws_param);
218 ret = AVERROR(ENOMEM);
223 if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
224 ret = AVERROR(ENOMEM);
228 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",
229 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
230 c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
231 c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
232 c->warning_limit = 100;
240 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
241 static const AVOption abuffer_options[] = {
242 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
243 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
244 { "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = FLAGS },
245 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = FLAGS },
249 AVFILTER_DEFINE_CLASS(abuffer);
251 static av_cold int init_audio(AVFilterContext *ctx, const char *args)
253 BufferSourceContext *s = ctx->priv;
256 s->class = &abuffer_class;
257 av_opt_set_defaults(s);
259 if ((ret = av_set_options_string(s, args, "=", ":")) < 0)
262 s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
263 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
264 av_log(ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n",
266 ret = AVERROR(EINVAL);
270 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
271 if (!s->channel_layout) {
272 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n",
273 s->channel_layout_str);
274 ret = AVERROR(EINVAL);
278 if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
279 ret = AVERROR(ENOMEM);
283 if (!s->time_base.num)
284 s->time_base = (AVRational){1, s->sample_rate};
286 av_log(ctx, AV_LOG_VERBOSE,
287 "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
288 s->time_base.num, s->time_base.den, s->sample_fmt_str,
289 s->sample_rate, s->channel_layout_str);
290 s->warning_limit = 100;
297 static av_cold void uninit(AVFilterContext *ctx)
299 BufferSourceContext *s = ctx->priv;
300 while (s->fifo && av_fifo_size(s->fifo)) {
301 AVFilterBufferRef *buf;
302 av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
303 avfilter_unref_buffer(buf);
305 av_fifo_free(s->fifo);
307 av_freep(&s->sws_param);
310 static int query_formats(AVFilterContext *ctx)
312 BufferSourceContext *c = ctx->priv;
313 AVFilterChannelLayouts *channel_layouts = NULL;
314 AVFilterFormats *formats = NULL;
315 AVFilterFormats *samplerates = NULL;
317 switch (ctx->outputs[0]->type) {
318 case AVMEDIA_TYPE_VIDEO:
319 ff_add_format(&formats, c->pix_fmt);
320 ff_set_common_formats(ctx, formats);
322 case AVMEDIA_TYPE_AUDIO:
323 ff_add_format(&formats, c->sample_fmt);
324 ff_set_common_formats(ctx, formats);
326 ff_add_format(&samplerates, c->sample_rate);
327 ff_set_common_samplerates(ctx, samplerates);
329 ff_add_channel_layout(&channel_layouts, c->channel_layout);
330 ff_set_common_channel_layouts(ctx, channel_layouts);
333 return AVERROR(EINVAL);
339 static int config_props(AVFilterLink *link)
341 BufferSourceContext *c = link->src->priv;
343 switch (link->type) {
344 case AVMEDIA_TYPE_VIDEO:
347 link->sample_aspect_ratio = c->pixel_aspect;
349 case AVMEDIA_TYPE_AUDIO:
350 link->channel_layout = c->channel_layout;
351 link->sample_rate = c->sample_rate;
354 return AVERROR(EINVAL);
357 link->time_base = c->time_base;
358 link->frame_rate = c->frame_rate;
362 static int request_frame(AVFilterLink *link)
364 BufferSourceContext *c = link->src->priv;
365 AVFilterBufferRef *buf;
368 if (!av_fifo_size(c->fifo)) {
371 c->nb_failed_requests++;
372 return AVERROR(EAGAIN);
374 av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
376 switch (link->type) {
377 case AVMEDIA_TYPE_VIDEO:
378 if ((ret = ff_start_frame(link, buf)) < 0 ||
379 (ret = ff_draw_slice(link, 0, link->h, 1)) < 0 ||
380 (ret = ff_end_frame(link)) < 0)
383 case AVMEDIA_TYPE_AUDIO:
384 ret = ff_filter_samples(link, buf);
387 avfilter_unref_bufferp(&buf);
388 return AVERROR(EINVAL);
394 static int poll_frame(AVFilterLink *link)
396 BufferSourceContext *c = link->src->priv;
397 int size = av_fifo_size(c->fifo);
400 return size/sizeof(AVFilterBufferRef*);
403 AVFilter avfilter_vsrc_buffer = {
405 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
406 .priv_size = sizeof(BufferSourceContext),
407 .query_formats = query_formats,
413 .outputs = (const AVFilterPad[]) {{ .name = "default",
414 .type = AVMEDIA_TYPE_VIDEO,
415 .request_frame = request_frame,
416 .poll_frame = poll_frame,
417 .config_props = config_props, },
419 .priv_class = &buffer_class,
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 = (const AVFilterPad[]) {{ .name = "default",
433 .type = AVMEDIA_TYPE_AUDIO,
434 .request_frame = request_frame,
435 .poll_frame = poll_frame,
436 .config_props = config_props, },
438 .priv_class = &abuffer_class,