2 * Copyright (c) 2008 Vitor Sessak
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; 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 "libavutil/channel_layout.h"
29 #include "libavutil/common.h"
30 #include "libavutil/fifo.h"
31 #include "libavutil/frame.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/samplefmt.h"
38 #include "buffersrc.h"
43 typedef struct BufferSourceContext {
46 AVRational time_base; ///< time_base to set in the output link
50 enum AVPixelFormat pix_fmt;
52 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 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
82 if (!(copy = av_frame_alloc()))
83 return AVERROR(ENOMEM);
84 ret = av_frame_ref(copy, frame);
86 ret = av_buffersrc_add_frame(ctx, copy);
92 int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx,
95 BufferSourceContext *s = ctx->priv;
103 return AVERROR(EINVAL);
105 refcounted = !!frame->buf[0];
107 switch (ctx->outputs[0]->type) {
108 case AVMEDIA_TYPE_VIDEO:
109 CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
112 case AVMEDIA_TYPE_AUDIO:
113 CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
117 return AVERROR(EINVAL);
120 if (!av_fifo_space(s->fifo) &&
121 (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
125 if (!(copy = av_frame_alloc()))
126 return AVERROR(ENOMEM);
129 av_frame_move_ref(copy, frame);
131 ret = av_frame_ref(copy, frame);
133 av_frame_free(©);
138 if ((ret = av_fifo_generic_write(s->fifo, ©, sizeof(copy), NULL)) < 0) {
140 av_frame_move_ref(frame, copy);
141 av_frame_free(©);
148 static av_cold int init_video(AVFilterContext *ctx)
150 BufferSourceContext *c = ctx->priv;
152 if (!c->pix_fmt_str || !c->w || !c->h || av_q2d(c->time_base) <= 0) {
153 av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
154 return AVERROR(EINVAL);
157 if ((c->pix_fmt = av_get_pix_fmt(c->pix_fmt_str)) == AV_PIX_FMT_NONE) {
159 c->pix_fmt = strtol(c->pix_fmt_str, &tail, 10);
160 if (*tail || c->pix_fmt < 0 || !av_pix_fmt_desc_get(c->pix_fmt)) {
161 av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", c->pix_fmt_str);
162 return AVERROR(EINVAL);
166 if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
167 return AVERROR(ENOMEM);
169 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_get_pix_fmt_name(c->pix_fmt));
173 #define OFFSET(x) offsetof(BufferSourceContext, x)
174 #define A AV_OPT_FLAG_AUDIO_PARAM
175 #define V AV_OPT_FLAG_VIDEO_PARAM
177 static const AVOption video_options[] = {
178 { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
179 { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
180 { "pix_fmt", NULL, OFFSET(pix_fmt_str), AV_OPT_TYPE_STRING, .flags = V },
181 #if FF_API_OLD_FILTER_OPTS
182 /* those 4 are for compatibility with the old option passing system where each filter
183 * did its own parsing */
184 { "time_base_num", "deprecated, do not use", OFFSET(time_base.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
185 { "time_base_den", "deprecated, do not use", OFFSET(time_base.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
186 { "sar_num", "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
187 { "sar_den", "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
189 { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
190 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
194 static const AVClass buffer_class = {
195 .class_name = "buffer source",
196 .item_name = av_default_item_name,
197 .option = video_options,
198 .version = LIBAVUTIL_VERSION_INT,
201 static const AVOption audio_options[] = {
202 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
203 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
204 { "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = A },
205 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
209 static const AVClass abuffer_class = {
210 .class_name = "abuffer source",
211 .item_name = av_default_item_name,
212 .option = audio_options,
213 .version = LIBAVUTIL_VERSION_INT,
216 static av_cold int init_audio(AVFilterContext *ctx)
218 BufferSourceContext *s = ctx->priv;
221 s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
222 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
223 av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
225 return AVERROR(EINVAL);
228 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
229 if (!s->channel_layout) {
230 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
231 s->channel_layout_str);
232 return AVERROR(EINVAL);
235 if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
236 return AVERROR(ENOMEM);
238 if (!s->time_base.num)
239 s->time_base = (AVRational){1, s->sample_rate};
241 av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
242 "ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
243 s->sample_rate, s->channel_layout_str);
248 static av_cold void uninit(AVFilterContext *ctx)
250 BufferSourceContext *s = ctx->priv;
251 while (s->fifo && av_fifo_size(s->fifo)) {
253 av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
254 av_frame_free(&frame);
256 av_fifo_free(s->fifo);
260 static int query_formats(AVFilterContext *ctx)
262 BufferSourceContext *c = ctx->priv;
263 AVFilterChannelLayouts *channel_layouts = NULL;
264 AVFilterFormats *formats = NULL;
265 AVFilterFormats *samplerates = NULL;
267 switch (ctx->outputs[0]->type) {
268 case AVMEDIA_TYPE_VIDEO:
269 ff_add_format(&formats, c->pix_fmt);
270 ff_set_common_formats(ctx, formats);
272 case AVMEDIA_TYPE_AUDIO:
273 ff_add_format(&formats, c->sample_fmt);
274 ff_set_common_formats(ctx, formats);
276 ff_add_format(&samplerates, c->sample_rate);
277 ff_set_common_samplerates(ctx, samplerates);
279 ff_add_channel_layout(&channel_layouts, c->channel_layout);
280 ff_set_common_channel_layouts(ctx, channel_layouts);
283 return AVERROR(EINVAL);
289 static int config_props(AVFilterLink *link)
291 BufferSourceContext *c = link->src->priv;
293 switch (link->type) {
294 case AVMEDIA_TYPE_VIDEO:
297 link->sample_aspect_ratio = c->pixel_aspect;
299 case AVMEDIA_TYPE_AUDIO:
300 link->channel_layout = c->channel_layout;
301 link->sample_rate = c->sample_rate;
304 return AVERROR(EINVAL);
307 link->time_base = c->time_base;
311 static int request_frame(AVFilterLink *link)
313 BufferSourceContext *c = link->src->priv;
317 if (!av_fifo_size(c->fifo)) {
320 return AVERROR(EAGAIN);
322 av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
324 ff_filter_frame(link, frame);
329 static int poll_frame(AVFilterLink *link)
331 BufferSourceContext *c = link->src->priv;
332 int size = av_fifo_size(c->fifo);
335 return size/sizeof(AVFrame*);
338 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
341 .type = AVMEDIA_TYPE_VIDEO,
342 .request_frame = request_frame,
343 .poll_frame = poll_frame,
344 .config_props = config_props,
349 AVFilter ff_vsrc_buffer = {
351 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
352 .priv_size = sizeof(BufferSourceContext),
353 .priv_class = &buffer_class,
354 .query_formats = query_formats,
360 .outputs = avfilter_vsrc_buffer_outputs,
363 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
366 .type = AVMEDIA_TYPE_AUDIO,
367 .request_frame = request_frame,
368 .poll_frame = poll_frame,
369 .config_props = config_props,
374 AVFilter ff_asrc_abuffer = {
376 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
377 .priv_size = sizeof(BufferSourceContext),
378 .priv_class = &abuffer_class,
379 .query_formats = query_formats,
385 .outputs = avfilter_asrc_abuffer_outputs,