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"
32 #include "vsrc_buffer.h"
35 #include "libavutil/audioconvert.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;
50 enum PixelFormat 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_ERROR, "Changing frame properties on the fly is not supported.\n");\
67 return AVERROR(EINVAL);\
70 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
71 if (c->sample_fmt != format || c->sample_rate != srate ||\
72 c->channel_layout != ch_layout) {\
73 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
74 return AVERROR(EINVAL);\
77 static AVFilterBufferRef *copy_buffer_ref(AVFilterContext *ctx,
78 AVFilterBufferRef *ref)
80 AVFilterLink *outlink = ctx->outputs[0];
81 AVFilterBufferRef *buf;
84 switch (outlink->type) {
86 case AVMEDIA_TYPE_VIDEO:
87 buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
88 ref->video->w, ref->video->h);
91 av_image_copy(buf->data, buf->linesize,
92 (void*)ref->data, ref->linesize,
93 ref->format, ref->video->w, ref->video->h);
96 case AVMEDIA_TYPE_AUDIO:
97 buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE,
98 ref->audio->nb_samples);
101 channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
102 av_samples_copy(buf->extended_data, ref->buf->extended_data,
103 0, 0, ref->audio->nb_samples,
111 avfilter_copy_buffer_ref_props(buf, ref);
115 int av_buffersrc_add_frame(AVFilterContext *buffer_src,
116 const AVFrame *frame, int flags)
118 AVFilterBufferRef *picref;
121 if (!frame) /* NULL for EOF */
122 return av_buffersrc_add_ref(buffer_src, NULL, flags);
124 switch (buffer_src->outputs[0]->type) {
125 case AVMEDIA_TYPE_VIDEO:
126 picref = avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
128 case AVMEDIA_TYPE_AUDIO:
129 picref = avfilter_get_audio_buffer_ref_from_frame(frame, AV_PERM_WRITE);
132 return AVERROR(ENOSYS);
135 return AVERROR(ENOMEM);
136 ret = av_buffersrc_add_ref(buffer_src, picref, flags);
137 picref->buf->data[0] = NULL;
138 avfilter_unref_buffer(picref);
142 int av_buffersrc_write_frame(AVFilterContext *buffer_filter, AVFrame *frame)
144 return av_buffersrc_add_frame(buffer_filter, frame, 0);
147 int av_buffersrc_add_ref(AVFilterContext *s, AVFilterBufferRef *buf, int flags)
149 BufferSourceContext *c = s->priv;
150 AVFilterBufferRef *to_free = NULL;
157 return AVERROR(EINVAL);
159 if (!av_fifo_space(c->fifo) &&
160 (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
164 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
165 switch (s->outputs[0]->type) {
166 case AVMEDIA_TYPE_VIDEO:
167 CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
169 case AVMEDIA_TYPE_AUDIO:
170 CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
174 return AVERROR(EINVAL);
177 if (!(flags & AV_BUFFERSRC_FLAG_NO_COPY))
178 to_free = buf = copy_buffer_ref(s, buf);
182 if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
183 avfilter_unref_buffer(to_free);
186 c->nb_failed_requests = 0;
191 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
193 return av_buffersrc_add_ref(s, buf, AV_BUFFERSRC_FLAG_NO_COPY);
196 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
198 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
201 #define OFFSET(x) offsetof(BufferSourceContext, x)
202 #define V AV_OPT_FLAG_VIDEO_PARAM
203 static const AVOption buffer_options[] = {
204 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, V },
205 { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, V },
206 { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
207 { "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, .flags = V },
208 { "pixel_aspect", NULL, OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, V },
209 { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
214 AVFILTER_DEFINE_CLASS(buffer);
216 static av_cold int init_video(AVFilterContext *ctx, const char *args, void *opaque)
218 BufferSourceContext *c = ctx->priv;
219 char pix_fmt_str[128], sws_param[256] = "", *colon, *equal;
222 c->class = &buffer_class;
225 av_log(ctx, AV_LOG_ERROR, "Arguments required\n");
226 return AVERROR(EINVAL);
228 colon = strchr(args, ':');
229 equal = strchr(args, '=');
230 if (equal && (!colon || equal < colon)) {
231 av_opt_set_defaults(c);
232 ret = av_set_options_string(c, args, "=", ":");
234 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: %s\n", args);
238 if ((n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
239 &c->time_base.num, &c->time_base.den,
240 &c->pixel_aspect.num, &c->pixel_aspect.den, sws_param)) < 7) {
241 av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
242 ret = AVERROR(EINVAL);
245 av_log(ctx, AV_LOG_WARNING, "Flat options syntax is deprecated, use key=value pairs\n");
247 if ((ret = ff_parse_pixel_format(&c->pix_fmt, pix_fmt_str, ctx)) < 0)
249 c->sws_param = av_strdup(sws_param);
251 ret = AVERROR(ENOMEM);
256 if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
257 ret = AVERROR(ENOMEM);
261 av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d sws_param:%s\n",
262 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
263 c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
264 c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
272 #define A AV_OPT_FLAG_AUDIO_PARAM
273 static const AVOption abuffer_options[] = {
274 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, A },
275 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { 0 }, 0, INT_MAX, A },
276 { "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = A },
277 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
281 AVFILTER_DEFINE_CLASS(abuffer);
283 static av_cold int init_audio(AVFilterContext *ctx, const char *args, void *opaque)
285 BufferSourceContext *s = ctx->priv;
288 s->class = &abuffer_class;
289 av_opt_set_defaults(s);
291 if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
292 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
296 s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
297 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
298 av_log(ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n",
300 ret = AVERROR(EINVAL);
304 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
305 if (!s->channel_layout) {
306 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n",
307 s->channel_layout_str);
308 ret = AVERROR(EINVAL);
312 if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
313 ret = AVERROR(ENOMEM);
317 if (!s->time_base.num)
318 s->time_base = (AVRational){1, s->sample_rate};
320 av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
321 "ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
322 s->sample_rate, s->channel_layout_str);
329 static av_cold void uninit(AVFilterContext *ctx)
331 BufferSourceContext *s = ctx->priv;
332 while (s->fifo && av_fifo_size(s->fifo)) {
333 AVFilterBufferRef *buf;
334 av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
335 avfilter_unref_buffer(buf);
337 av_fifo_free(s->fifo);
339 av_freep(&s->sws_param);
342 static int query_formats(AVFilterContext *ctx)
344 BufferSourceContext *c = ctx->priv;
345 AVFilterChannelLayouts *channel_layouts = NULL;
346 AVFilterFormats *formats = NULL;
347 AVFilterFormats *samplerates = NULL;
349 switch (ctx->outputs[0]->type) {
350 case AVMEDIA_TYPE_VIDEO:
351 ff_add_format(&formats, c->pix_fmt);
352 ff_set_common_formats(ctx, formats);
354 case AVMEDIA_TYPE_AUDIO:
355 ff_add_format(&formats, c->sample_fmt);
356 ff_set_common_formats(ctx, formats);
358 ff_add_format(&samplerates, c->sample_rate);
359 ff_set_common_samplerates(ctx, samplerates);
361 ff_add_channel_layout(&channel_layouts, c->channel_layout);
362 ff_set_common_channel_layouts(ctx, channel_layouts);
365 return AVERROR(EINVAL);
371 static int config_props(AVFilterLink *link)
373 BufferSourceContext *c = link->src->priv;
375 switch (link->type) {
376 case AVMEDIA_TYPE_VIDEO:
379 link->sample_aspect_ratio = c->pixel_aspect;
381 case AVMEDIA_TYPE_AUDIO:
382 link->channel_layout = c->channel_layout;
383 link->sample_rate = c->sample_rate;
386 return AVERROR(EINVAL);
389 link->time_base = c->time_base;
390 link->frame_rate = c->frame_rate;
394 static int request_frame(AVFilterLink *link)
396 BufferSourceContext *c = link->src->priv;
397 AVFilterBufferRef *buf;
399 if (!av_fifo_size(c->fifo)) {
402 c->nb_failed_requests++;
403 return AVERROR(EAGAIN);
405 av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
407 switch (link->type) {
408 case AVMEDIA_TYPE_VIDEO:
409 ff_start_frame(link, avfilter_ref_buffer(buf, ~0));
410 ff_draw_slice(link, 0, link->h, 1);
413 case AVMEDIA_TYPE_AUDIO:
414 ff_filter_samples(link, avfilter_ref_buffer(buf, ~0));
417 return AVERROR(EINVAL);
420 avfilter_unref_buffer(buf);
425 static int poll_frame(AVFilterLink *link)
427 BufferSourceContext *c = link->src->priv;
428 int size = av_fifo_size(c->fifo);
431 return size/sizeof(AVFilterBufferRef*);
434 AVFilter avfilter_vsrc_buffer = {
436 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
437 .priv_size = sizeof(BufferSourceContext),
438 .query_formats = query_formats,
443 .inputs = (AVFilterPad[]) {{ .name = NULL }},
444 .outputs = (AVFilterPad[]) {{ .name = "default",
445 .type = AVMEDIA_TYPE_VIDEO,
446 .request_frame = request_frame,
447 .poll_frame = poll_frame,
448 .config_props = config_props, },
452 AVFilter avfilter_asrc_abuffer = {
454 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
455 .priv_size = sizeof(BufferSourceContext),
456 .query_formats = query_formats,
461 .inputs = (AVFilterPad[]) {{ .name = NULL }},
462 .outputs = (AVFilterPad[]) {{ .name = "default",
463 .type = AVMEDIA_TYPE_AUDIO,
464 .request_frame = request_frame,
465 .poll_frame = poll_frame,
466 .config_props = config_props, },