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 unsigned nb_failed_requests;
49 enum PixelFormat pix_fmt;
50 AVRational pixel_aspect;
55 enum AVSampleFormat sample_fmt;
57 uint64_t channel_layout;
58 char *channel_layout_str;
61 } BufferSourceContext;
63 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
64 if (c->w != width || c->h != height || c->pix_fmt != format) {\
65 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
66 return AVERROR(EINVAL);\
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 static AVFilterBufferRef *copy_buffer_ref(AVFilterContext *ctx,
77 AVFilterBufferRef *ref)
79 AVFilterLink *outlink = ctx->outputs[0];
80 AVFilterBufferRef *buf;
83 switch (outlink->type) {
85 case AVMEDIA_TYPE_VIDEO:
86 buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
87 ref->video->w, ref->video->h);
90 av_image_copy(buf->data, buf->linesize,
91 (void*)ref->data, ref->linesize,
92 ref->format, ref->video->w, ref->video->h);
95 case AVMEDIA_TYPE_AUDIO:
96 buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE,
97 ref->audio->nb_samples);
100 channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
101 av_samples_copy(buf->extended_data, ref->buf->extended_data,
102 0, 0, ref->audio->nb_samples,
110 avfilter_copy_buffer_ref_props(buf, ref);
114 #if FF_API_VSRC_BUFFER_ADD_FRAME
115 static int av_vsrc_buffer_add_frame_alt(AVFilterContext *buffer_filter, AVFrame *frame,
116 int64_t pts, AVRational pixel_aspect)
118 int64_t orig_pts = frame->pts;
119 AVRational orig_sar = frame->sample_aspect_ratio;
123 frame->sample_aspect_ratio = pixel_aspect;
124 if ((ret = av_buffersrc_write_frame(buffer_filter, frame)) < 0)
126 frame->pts = orig_pts;
127 frame->sample_aspect_ratio = orig_sar;
133 int av_buffersrc_add_frame(AVFilterContext *buffer_src,
134 const AVFrame *frame, int flags)
136 AVFilterBufferRef *picref;
139 if (!frame) /* NULL for EOF */
140 return av_buffersrc_add_ref(buffer_src, NULL, flags);
142 switch (buffer_src->outputs[0]->type) {
143 case AVMEDIA_TYPE_VIDEO:
144 picref = avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
146 case AVMEDIA_TYPE_AUDIO:
147 picref = avfilter_get_audio_buffer_ref_from_frame(frame, AV_PERM_WRITE);
150 return AVERROR(ENOSYS);
153 return AVERROR(ENOMEM);
154 ret = av_buffersrc_add_ref(buffer_src, picref, flags);
155 picref->buf->data[0] = NULL;
156 avfilter_unref_buffer(picref);
160 int av_buffersrc_write_frame(AVFilterContext *buffer_filter, AVFrame *frame)
162 return av_buffersrc_add_frame(buffer_filter, frame, 0);
165 int av_buffersrc_add_ref(AVFilterContext *s, AVFilterBufferRef *buf, int flags)
167 BufferSourceContext *c = s->priv;
168 AVFilterBufferRef *to_free = NULL;
175 return AVERROR(EINVAL);
177 if (!av_fifo_space(c->fifo) &&
178 (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
182 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
183 switch (s->outputs[0]->type) {
184 case AVMEDIA_TYPE_VIDEO:
185 CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
187 case AVMEDIA_TYPE_AUDIO:
188 CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
192 return AVERROR(EINVAL);
195 if (!(flags & AV_BUFFERSRC_FLAG_NO_COPY))
196 to_free = buf = copy_buffer_ref(s, buf);
200 if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
201 avfilter_unref_buffer(to_free);
204 c->nb_failed_requests = 0;
209 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
211 return av_buffersrc_add_ref(s, buf, AV_BUFFERSRC_FLAG_NO_COPY);
214 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
216 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
219 static av_cold int init_video(AVFilterContext *ctx, const char *args, void *opaque)
221 BufferSourceContext *c = ctx->priv;
222 char pix_fmt_str[128];
227 (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
228 &c->time_base.num, &c->time_base.den,
229 &c->pixel_aspect.num, &c->pixel_aspect.den, c->sws_param)) < 7) {
230 av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
231 return AVERROR(EINVAL);
234 if ((ret = ff_parse_pixel_format(&c->pix_fmt, pix_fmt_str, ctx)) < 0)
237 if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
238 return AVERROR(ENOMEM);
240 av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",
241 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
242 c->time_base.num, c->time_base.den,
243 c->pixel_aspect.num, c->pixel_aspect.den, c->sws_param);
247 #define OFFSET(x) offsetof(BufferSourceContext, x)
248 #define A AV_OPT_FLAG_AUDIO_PARAM
249 static const AVOption audio_options[] = {
250 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, A },
251 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { 0 }, 0, INT_MAX, A },
252 { "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = A },
253 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
257 static const AVClass abuffer_class = {
258 .class_name = "abuffer source",
259 .item_name = av_default_item_name,
260 .option = audio_options,
261 .version = LIBAVUTIL_VERSION_INT,
262 .category = AV_CLASS_CATEGORY_FILTER,
265 static av_cold int init_audio(AVFilterContext *ctx, const char *args, void *opaque)
267 BufferSourceContext *s = ctx->priv;
270 s->class = &abuffer_class;
271 av_opt_set_defaults(s);
273 if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
274 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: %s.\n", args);
278 s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
279 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
280 av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
282 ret = AVERROR(EINVAL);
286 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
287 if (!s->channel_layout) {
288 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
289 s->channel_layout_str);
290 ret = AVERROR(EINVAL);
294 if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
295 ret = AVERROR(ENOMEM);
299 if (!s->time_base.num)
300 s->time_base = (AVRational){1, s->sample_rate};
302 av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
303 "ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
304 s->sample_rate, s->channel_layout_str);
311 static av_cold void uninit(AVFilterContext *ctx)
313 BufferSourceContext *s = ctx->priv;
314 while (s->fifo && av_fifo_size(s->fifo)) {
315 AVFilterBufferRef *buf;
316 av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
317 avfilter_unref_buffer(buf);
319 av_fifo_free(s->fifo);
323 static int query_formats(AVFilterContext *ctx)
325 BufferSourceContext *c = ctx->priv;
326 AVFilterChannelLayouts *channel_layouts = NULL;
327 AVFilterFormats *formats = NULL;
328 AVFilterFormats *samplerates = NULL;
330 switch (ctx->outputs[0]->type) {
331 case AVMEDIA_TYPE_VIDEO:
332 ff_add_format(&formats, c->pix_fmt);
333 ff_set_common_formats(ctx, formats);
335 case AVMEDIA_TYPE_AUDIO:
336 ff_add_format(&formats, c->sample_fmt);
337 ff_set_common_formats(ctx, formats);
339 ff_add_format(&samplerates, c->sample_rate);
340 ff_set_common_samplerates(ctx, samplerates);
342 ff_add_channel_layout(&channel_layouts, c->channel_layout);
343 ff_set_common_channel_layouts(ctx, channel_layouts);
346 return AVERROR(EINVAL);
352 static int config_props(AVFilterLink *link)
354 BufferSourceContext *c = link->src->priv;
356 switch (link->type) {
357 case AVMEDIA_TYPE_VIDEO:
360 link->sample_aspect_ratio = c->pixel_aspect;
362 case AVMEDIA_TYPE_AUDIO:
363 link->channel_layout = c->channel_layout;
364 link->sample_rate = c->sample_rate;
367 return AVERROR(EINVAL);
370 link->time_base = c->time_base;
374 static int request_frame(AVFilterLink *link)
376 BufferSourceContext *c = link->src->priv;
377 AVFilterBufferRef *buf;
379 if (!av_fifo_size(c->fifo)) {
382 c->nb_failed_requests++;
383 return AVERROR(EAGAIN);
385 av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
387 switch (link->type) {
388 case AVMEDIA_TYPE_VIDEO:
389 ff_start_frame(link, avfilter_ref_buffer(buf, ~0));
390 ff_draw_slice(link, 0, link->h, 1);
393 case AVMEDIA_TYPE_AUDIO:
394 ff_filter_samples(link, avfilter_ref_buffer(buf, ~0));
397 return AVERROR(EINVAL);
400 avfilter_unref_buffer(buf);
405 static int poll_frame(AVFilterLink *link)
407 BufferSourceContext *c = link->src->priv;
408 int size = av_fifo_size(c->fifo);
411 return size/sizeof(AVFilterBufferRef*);
414 AVFilter avfilter_vsrc_buffer = {
416 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
417 .priv_size = sizeof(BufferSourceContext),
418 .query_formats = query_formats,
423 .inputs = (AVFilterPad[]) {{ .name = NULL }},
424 .outputs = (AVFilterPad[]) {{ .name = "default",
425 .type = AVMEDIA_TYPE_VIDEO,
426 .request_frame = request_frame,
427 .poll_frame = poll_frame,
428 .config_props = config_props, },
432 AVFilter avfilter_asrc_abuffer = {
434 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
435 .priv_size = sizeof(BufferSourceContext),
436 .query_formats = query_formats,
441 .inputs = (AVFilterPad[]) {{ .name = NULL }},
442 .outputs = (AVFilterPad[]) {{ .name = "default",
443 .type = AVMEDIA_TYPE_AUDIO,
444 .request_frame = request_frame,
445 .poll_frame = poll_frame,
446 .config_props = config_props, },