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"
31 #include "vsrc_buffer.h"
34 #include "libavutil/audioconvert.h"
35 #include "libavutil/fifo.h"
36 #include "libavutil/imgutils.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/samplefmt.h"
43 AVRational time_base; ///< time_base to set in the output link
44 unsigned nb_failed_requests;
48 enum PixelFormat pix_fmt;
49 AVRational pixel_aspect;
54 enum AVSampleFormat sample_fmt;
56 uint64_t channel_layout;
57 char *channel_layout_str;
60 } BufferSourceContext;
62 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
63 if (c->w != width || c->h != height || c->pix_fmt != format) {\
64 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
65 return AVERROR(EINVAL);\
68 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
69 if (c->sample_fmt != format || c->sample_rate != srate ||\
70 c->channel_layout != ch_layout) {\
71 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
72 return AVERROR(EINVAL);\
75 static AVFilterBufferRef *copy_buffer_ref(AVFilterContext *ctx,
76 AVFilterBufferRef *ref)
78 AVFilterLink *outlink = ctx->outputs[0];
79 AVFilterBufferRef *buf;
82 switch (outlink->type) {
84 case AVMEDIA_TYPE_VIDEO:
85 buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
86 ref->video->w, ref->video->h);
89 av_image_copy(buf->data, buf->linesize,
90 (void*)ref->data, ref->linesize,
91 ref->format, ref->video->w, ref->video->h);
94 case AVMEDIA_TYPE_AUDIO:
95 buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE,
96 ref->audio->nb_samples);
99 channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
100 av_samples_copy(buf->extended_data, ref->buf->extended_data,
101 0, 0, ref->audio->nb_samples,
109 avfilter_copy_buffer_ref_props(buf, ref);
113 #if FF_API_VSRC_BUFFER_ADD_FRAME
114 static int av_vsrc_buffer_add_frame_alt(AVFilterContext *buffer_filter, AVFrame *frame,
115 int64_t pts, AVRational pixel_aspect)
117 int64_t orig_pts = frame->pts;
118 AVRational orig_sar = frame->sample_aspect_ratio;
122 frame->sample_aspect_ratio = pixel_aspect;
123 if ((ret = av_buffersrc_write_frame(buffer_filter, frame)) < 0)
125 frame->pts = orig_pts;
126 frame->sample_aspect_ratio = orig_sar;
132 int av_buffersrc_add_frame(AVFilterContext *buffer_src,
133 const AVFrame *frame, int flags)
135 AVFilterBufferRef *picref;
138 if (!frame) /* NULL for EOF */
139 return av_buffersrc_add_ref(buffer_src, NULL, flags);
141 switch (buffer_src->outputs[0]->type) {
142 case AVMEDIA_TYPE_VIDEO:
143 picref = avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
145 case AVMEDIA_TYPE_AUDIO:
146 picref = avfilter_get_audio_buffer_ref_from_frame(frame, AV_PERM_WRITE);
149 return AVERROR(ENOSYS);
152 return AVERROR(ENOMEM);
153 ret = av_buffersrc_add_ref(buffer_src, picref, flags);
154 picref->buf->data[0] = NULL;
155 avfilter_unref_buffer(picref);
159 int av_buffersrc_write_frame(AVFilterContext *buffer_filter, AVFrame *frame)
161 return av_buffersrc_add_frame(buffer_filter, frame, 0);
164 int av_buffersrc_add_ref(AVFilterContext *s, AVFilterBufferRef *buf, int flags)
166 BufferSourceContext *c = s->priv;
167 AVFilterBufferRef *to_free = NULL;
174 return AVERROR(EINVAL);
176 if (!av_fifo_space(c->fifo) &&
177 (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
181 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
182 switch (s->outputs[0]->type) {
183 case AVMEDIA_TYPE_VIDEO:
184 CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
186 case AVMEDIA_TYPE_AUDIO:
187 CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
191 return AVERROR(EINVAL);
194 if (!(flags & AV_BUFFERSRC_FLAG_NO_COPY))
195 to_free = buf = copy_buffer_ref(s, buf);
199 if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
200 avfilter_unref_buffer(to_free);
203 c->nb_failed_requests = 0;
208 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
210 return av_buffersrc_add_ref(s, buf, AV_BUFFERSRC_FLAG_NO_COPY);
213 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
215 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
218 static av_cold int init_video(AVFilterContext *ctx, const char *args, void *opaque)
220 BufferSourceContext *c = ctx->priv;
221 char pix_fmt_str[128];
226 (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
227 &c->time_base.num, &c->time_base.den,
228 &c->pixel_aspect.num, &c->pixel_aspect.den, c->sws_param)) < 7) {
229 av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
230 return AVERROR(EINVAL);
233 if ((ret = ff_parse_pixel_format(&c->pix_fmt, pix_fmt_str, ctx)) < 0)
236 if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
237 return AVERROR(ENOMEM);
239 av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",
240 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
241 c->time_base.num, c->time_base.den,
242 c->pixel_aspect.num, c->pixel_aspect.den, c->sws_param);
246 #define OFFSET(x) offsetof(BufferSourceContext, x)
247 #define A AV_OPT_FLAG_AUDIO_PARAM
248 static const AVOption audio_options[] = {
249 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, A },
250 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { 0 }, 0, INT_MAX, A },
251 { "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = A },
252 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
256 static const AVClass abuffer_class = {
257 .class_name = "abuffer source",
258 .item_name = av_default_item_name,
259 .option = audio_options,
260 .version = LIBAVUTIL_VERSION_INT,
263 static av_cold int init_audio(AVFilterContext *ctx, const char *args, void *opaque)
265 BufferSourceContext *s = ctx->priv;
268 s->class = &abuffer_class;
269 av_opt_set_defaults(s);
271 if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
272 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: %s.\n", args);
276 s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
277 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
278 av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
280 ret = AVERROR(EINVAL);
284 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
285 if (!s->channel_layout) {
286 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
287 s->channel_layout_str);
288 ret = AVERROR(EINVAL);
292 if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
293 ret = AVERROR(ENOMEM);
297 if (!s->time_base.num)
298 s->time_base = (AVRational){1, s->sample_rate};
300 av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
301 "ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
302 s->sample_rate, s->channel_layout_str);
309 static av_cold void uninit(AVFilterContext *ctx)
311 BufferSourceContext *s = ctx->priv;
312 while (s->fifo && av_fifo_size(s->fifo)) {
313 AVFilterBufferRef *buf;
314 av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
315 avfilter_unref_buffer(buf);
317 av_fifo_free(s->fifo);
321 static int query_formats(AVFilterContext *ctx)
323 BufferSourceContext *c = ctx->priv;
324 AVFilterChannelLayouts *channel_layouts = NULL;
325 AVFilterFormats *formats = NULL;
326 AVFilterFormats *samplerates = NULL;
328 switch (ctx->outputs[0]->type) {
329 case AVMEDIA_TYPE_VIDEO:
330 avfilter_add_format(&formats, c->pix_fmt);
331 avfilter_set_common_formats(ctx, formats);
333 case AVMEDIA_TYPE_AUDIO:
334 avfilter_add_format(&formats, c->sample_fmt);
335 avfilter_set_common_formats(ctx, formats);
337 avfilter_add_format(&samplerates, c->sample_rate);
338 ff_set_common_samplerates(ctx, samplerates);
340 ff_add_channel_layout(&channel_layouts, c->channel_layout);
341 ff_set_common_channel_layouts(ctx, channel_layouts);
344 return AVERROR(EINVAL);
350 static int config_props(AVFilterLink *link)
352 BufferSourceContext *c = link->src->priv;
354 switch (link->type) {
355 case AVMEDIA_TYPE_VIDEO:
358 link->sample_aspect_ratio = c->pixel_aspect;
360 case AVMEDIA_TYPE_AUDIO:
361 link->channel_layout = c->channel_layout;
362 link->sample_rate = c->sample_rate;
365 return AVERROR(EINVAL);
368 link->time_base = c->time_base;
372 static int request_frame(AVFilterLink *link)
374 BufferSourceContext *c = link->src->priv;
375 AVFilterBufferRef *buf;
377 if (!av_fifo_size(c->fifo)) {
380 c->nb_failed_requests++;
381 return AVERROR(EAGAIN);
383 av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
385 switch (link->type) {
386 case AVMEDIA_TYPE_VIDEO:
387 avfilter_start_frame(link, avfilter_ref_buffer(buf, ~0));
388 avfilter_draw_slice(link, 0, link->h, 1);
389 avfilter_end_frame(link);
391 case AVMEDIA_TYPE_AUDIO:
392 ff_filter_samples(link, avfilter_ref_buffer(buf, ~0));
395 return AVERROR(EINVAL);
398 avfilter_unref_buffer(buf);
403 static int poll_frame(AVFilterLink *link)
405 BufferSourceContext *c = link->src->priv;
406 int size = av_fifo_size(c->fifo);
409 return size/sizeof(AVFilterBufferRef*);
412 AVFilter avfilter_vsrc_buffer = {
414 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
415 .priv_size = sizeof(BufferSourceContext),
416 .query_formats = query_formats,
421 .inputs = (AVFilterPad[]) {{ .name = NULL }},
422 .outputs = (AVFilterPad[]) {{ .name = "default",
423 .type = AVMEDIA_TYPE_VIDEO,
424 .request_frame = request_frame,
425 .poll_frame = poll_frame,
426 .config_props = config_props, },
430 AVFilter avfilter_asrc_abuffer = {
432 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
433 .priv_size = sizeof(BufferSourceContext),
434 .query_formats = query_formats,
439 .inputs = (AVFilterPad[]) {{ .name = NULL }},
440 .outputs = (AVFilterPad[]) {{ .name = "default",
441 .type = AVMEDIA_TYPE_AUDIO,
442 .request_frame = request_frame,
443 .poll_frame = poll_frame,
444 .config_props = config_props, },