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
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/common.h"
28 #include "libavutil/fifo.h"
29 #include "libavutil/frame.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/samplefmt.h"
35 #include "buffersrc.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 AVPixelFormat pix_fmt;
52 AVRational pixel_aspect;
57 enum AVSampleFormat sample_fmt;
60 uint64_t channel_layout;
61 char *channel_layout_str;
64 } BufferSourceContext;
66 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
67 if (c->w != width || c->h != height || c->pix_fmt != format) {\
68 av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
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_write_frame(AVFilterContext *ctx, const AVFrame *frame)
80 return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
81 AV_BUFFERSRC_FLAG_KEEP_REF);
84 int av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
86 return av_buffersrc_add_frame_flags(ctx, frame, 0);
89 static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
90 AVFrame *frame, int flags);
92 int av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
97 if (frame && frame->channel_layout &&
98 av_get_channel_layout_nb_channels(frame->channel_layout) != av_frame_get_channels(frame)) {
99 av_log(0, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
100 return AVERROR(EINVAL);
103 if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
104 return av_buffersrc_add_frame_internal(ctx, frame, flags);
106 if (!(copy = av_frame_alloc()))
107 return AVERROR(ENOMEM);
108 ret = av_frame_ref(copy, frame);
110 ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
112 av_frame_free(©);
116 static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
117 AVFrame *frame, int flags)
119 BufferSourceContext *s = ctx->priv;
127 return AVERROR(EINVAL);
129 if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
131 switch (ctx->outputs[0]->type) {
132 case AVMEDIA_TYPE_VIDEO:
133 CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
136 case AVMEDIA_TYPE_AUDIO:
137 CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
141 return AVERROR(EINVAL);
146 if (!av_fifo_space(s->fifo) &&
147 (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
151 if (!(copy = av_frame_alloc()))
152 return AVERROR(ENOMEM);
153 av_frame_move_ref(copy, frame);
155 if ((ret = av_fifo_generic_write(s->fifo, ©, sizeof(copy), NULL)) < 0) {
156 av_frame_move_ref(frame, copy);
157 av_frame_free(©);
161 if ((flags & AV_BUFFERSRC_FLAG_PUSH))
162 if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
168 #if FF_API_AVFILTERBUFFER
169 static void compat_free_buffer(void *opaque, uint8_t *data)
171 AVFilterBufferRef *buf = opaque;
172 avfilter_unref_buffer(buf);
175 static void compat_unref_buffer(void *opaque, uint8_t *data)
177 AVBufferRef *buf = opaque;
178 av_buffer_unref(&buf);
181 int av_buffersrc_add_ref(AVFilterContext *ctx, AVFilterBufferRef *buf,
184 BufferSourceContext *s = ctx->priv;
185 AVFrame *frame = NULL;
186 AVBufferRef *dummy_buf = NULL;
187 int ret = 0, planes, i;
193 return AVERROR(EINVAL);
195 frame = av_frame_alloc();
197 return AVERROR(ENOMEM);
199 dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, buf,
200 (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);
202 ret = AVERROR(ENOMEM);
206 if ((ret = avfilter_copy_buf_props(frame, buf)) < 0)
209 #define WRAP_PLANE(ref_out, data, data_size) \
211 AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf); \
213 ret = AVERROR(ENOMEM); \
216 ref_out = av_buffer_create(data, data_size, compat_unref_buffer, \
217 dummy_ref, (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY); \
219 av_frame_unref(frame); \
220 ret = AVERROR(ENOMEM); \
225 if (ctx->outputs[0]->type == AVMEDIA_TYPE_VIDEO) {
226 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
229 ret = AVERROR(EINVAL);
232 planes = (desc->flags & PIX_FMT_PLANAR) ? desc->nb_components : 1;
234 for (i = 0; i < planes; i++) {
235 int h_shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
236 int plane_size = (frame->width >> h_shift) * frame->linesize[i];
238 WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
241 int planar = av_sample_fmt_is_planar(frame->format);
242 int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
244 planes = planar ? channels : 1;
246 if (planes > FF_ARRAY_ELEMS(frame->buf)) {
247 frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
248 frame->extended_buf = av_mallocz(sizeof(*frame->extended_buf) *
249 frame->nb_extended_buf);
250 if (!frame->extended_buf) {
251 ret = AVERROR(ENOMEM);
256 for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
257 WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);
259 for (i = 0; i < planes - FF_ARRAY_ELEMS(frame->buf); i++)
260 WRAP_PLANE(frame->extended_buf[i],
261 frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
265 ret = av_buffersrc_add_frame_flags(ctx, frame, flags);
268 av_buffer_unref(&dummy_buf);
269 av_frame_free(&frame);
274 int av_buffersrc_buffer(AVFilterContext *ctx, AVFilterBufferRef *buf)
276 return av_buffersrc_add_ref(ctx, buf, 0);
280 #define OFFSET(x) offsetof(BufferSourceContext, x)
281 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
282 static const AVOption buffer_options[] = {
283 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
284 { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
285 { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = FLAGS },
286 { "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, .flags = FLAGS },
287 { "pixel_aspect", NULL, OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
288 { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = FLAGS },
293 AVFILTER_DEFINE_CLASS(buffer);
295 static av_cold int init_video(AVFilterContext *ctx, const char *args)
297 BufferSourceContext *c = ctx->priv;
298 char pix_fmt_str[128], *colon, *equal;
301 c->class = &buffer_class;
304 av_log(ctx, AV_LOG_ERROR, "Arguments required\n");
305 return AVERROR(EINVAL);
308 colon = strchr(args, ':');
309 equal = strchr(args, '=');
310 if (equal && (!colon || equal < colon)) {
311 av_opt_set_defaults(c);
312 ret = av_set_options_string(c, args, "=", ":");
317 (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
318 &c->time_base.num, &c->time_base.den,
319 &c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
320 av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
321 return AVERROR(EINVAL);
323 if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == AV_PIX_FMT_NONE) {
325 c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
326 if (*tail || c->pix_fmt < 0 || c->pix_fmt >= AV_PIX_FMT_NB) {
327 av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
328 return AVERROR(EINVAL);
333 if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
334 return AVERROR(ENOMEM);
336 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",
337 c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
338 c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
339 c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
340 c->warning_limit = 100;
348 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
350 return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
353 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
354 static const AVOption abuffer_options[] = {
355 { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
356 { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
357 { "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = FLAGS },
358 { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
359 { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = FLAGS },
363 AVFILTER_DEFINE_CLASS(abuffer);
365 static av_cold int init_audio(AVFilterContext *ctx, const char *args)
367 BufferSourceContext *s = ctx->priv;
370 s->class = &abuffer_class;
371 av_opt_set_defaults(s);
373 if ((ret = av_set_options_string(s, args, "=", ":")) < 0)
376 s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
377 if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
378 av_log(ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n",
380 ret = AVERROR(EINVAL);
384 if (s->channel_layout_str) {
387 s->channel_layout = av_get_channel_layout(s->channel_layout_str);
388 if (!s->channel_layout) {
389 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n",
390 s->channel_layout_str);
391 ret = AVERROR(EINVAL);
394 n = av_get_channel_layout_nb_channels(s->channel_layout);
396 if (n != s->channels) {
397 av_log(ctx, AV_LOG_ERROR,
398 "Mismatching channel count %d and layout '%s' "
400 s->channels, s->channel_layout_str, n);
401 ret = AVERROR(EINVAL);
406 } else if (!s->channels) {
407 av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
408 "channel layout specified\n");
409 ret = AVERROR(EINVAL);
413 if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*)))) {
414 ret = AVERROR(ENOMEM);
418 if (!s->time_base.num)
419 s->time_base = (AVRational){1, s->sample_rate};
421 av_log(ctx, AV_LOG_VERBOSE,
422 "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
423 s->time_base.num, s->time_base.den, s->sample_fmt_str,
424 s->sample_rate, s->channel_layout_str);
425 s->warning_limit = 100;
432 static av_cold void uninit(AVFilterContext *ctx)
434 BufferSourceContext *s = ctx->priv;
435 while (s->fifo && av_fifo_size(s->fifo)) {
437 av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
438 av_frame_free(&frame);
440 av_fifo_free(s->fifo);
442 av_freep(&s->sws_param);
445 static int query_formats(AVFilterContext *ctx)
447 BufferSourceContext *c = ctx->priv;
448 AVFilterChannelLayouts *channel_layouts = NULL;
449 AVFilterFormats *formats = NULL;
450 AVFilterFormats *samplerates = NULL;
452 switch (ctx->outputs[0]->type) {
453 case AVMEDIA_TYPE_VIDEO:
454 ff_add_format(&formats, c->pix_fmt);
455 ff_set_common_formats(ctx, formats);
457 case AVMEDIA_TYPE_AUDIO:
458 ff_add_format(&formats, c->sample_fmt);
459 ff_set_common_formats(ctx, formats);
461 ff_add_format(&samplerates, c->sample_rate);
462 ff_set_common_samplerates(ctx, samplerates);
464 ff_add_channel_layout(&channel_layouts,
465 c->channel_layout ? c->channel_layout :
466 FF_COUNT2LAYOUT(c->channels));
467 ff_set_common_channel_layouts(ctx, channel_layouts);
470 return AVERROR(EINVAL);
476 static int config_props(AVFilterLink *link)
478 BufferSourceContext *c = link->src->priv;
480 switch (link->type) {
481 case AVMEDIA_TYPE_VIDEO:
484 link->sample_aspect_ratio = c->pixel_aspect;
486 case AVMEDIA_TYPE_AUDIO:
487 if (!c->channel_layout)
488 c->channel_layout = link->channel_layout;
491 return AVERROR(EINVAL);
494 link->time_base = c->time_base;
495 link->frame_rate = c->frame_rate;
499 static int request_frame(AVFilterLink *link)
501 BufferSourceContext *c = link->src->priv;
505 if (!av_fifo_size(c->fifo)) {
508 c->nb_failed_requests++;
509 return AVERROR(EAGAIN);
511 av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
513 /* CIG TODO do not ignore error */
514 ff_filter_frame(link, frame);
519 static int poll_frame(AVFilterLink *link)
521 BufferSourceContext *c = link->src->priv;
522 int size = av_fifo_size(c->fifo);
525 return size/sizeof(AVFrame*);
528 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
531 .type = AVMEDIA_TYPE_VIDEO,
532 .request_frame = request_frame,
533 .poll_frame = poll_frame,
534 .config_props = config_props,
539 AVFilter avfilter_vsrc_buffer = {
541 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
542 .priv_size = sizeof(BufferSourceContext),
543 .query_formats = query_formats,
549 .outputs = avfilter_vsrc_buffer_outputs,
550 .priv_class = &buffer_class,
553 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
556 .type = AVMEDIA_TYPE_AUDIO,
557 .request_frame = request_frame,
558 .poll_frame = poll_frame,
559 .config_props = config_props,
564 AVFilter avfilter_asrc_abuffer = {
566 .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
567 .priv_size = sizeof(BufferSourceContext),
568 .query_formats = query_formats,
574 .outputs = avfilter_asrc_abuffer_outputs,
575 .priv_class = &abuffer_class,