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
29 #include "buffersrc.h"
30 #include "vsrc_buffer.h"
31 #include "libavutil/imgutils.h"
34 AVFilterBufferRef *picref;
36 enum PixelFormat pix_fmt;
37 AVRational time_base; ///< time_base to set in the output link
38 AVRational sample_aspect_ratio;
40 } BufferSourceContext;
42 int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter,
43 AVFilterBufferRef *picref, int flags)
45 BufferSourceContext *c = buffer_filter->priv;
46 AVFilterLink *outlink = buffer_filter->outputs[0];
50 if (flags & AV_VSRC_BUF_FLAG_OVERWRITE) {
51 avfilter_unref_buffer(c->picref);
54 av_log(buffer_filter, AV_LOG_ERROR,
55 "Buffering several frames is not supported. "
56 "Please consume all available frames before adding a new one.\n");
57 return AVERROR(EINVAL);
61 if (picref->video->w != c->w || picref->video->h != c->h || picref->format != c->pix_fmt) {
62 AVFilterContext *scale = buffer_filter->outputs[0]->dst;
64 char scale_param[1024];
66 av_log(buffer_filter, AV_LOG_INFO,
67 "Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
68 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
69 picref->video->w, picref->video->h, av_pix_fmt_descriptors[picref->format].name);
71 if (!scale || strcmp(scale->filter->name, "scale")) {
72 AVFilter *f = avfilter_get_by_name("scale");
74 av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
75 if ((ret = avfilter_open(&scale, f, "Input equalizer")) < 0)
78 snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s", c->w, c->h, c->sws_param);
79 if ((ret = avfilter_init_filter(scale, scale_param, NULL)) < 0) {
84 if ((ret = avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0)) < 0) {
88 scale->outputs[0]->time_base = scale->inputs[0]->time_base;
90 scale->outputs[0]->format= c->pix_fmt;
91 } else if (!strcmp(scale->filter->name, "scale")) {
92 snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s",
93 scale->outputs[0]->w, scale->outputs[0]->h, c->sws_param);
94 scale->filter->init(scale, scale_param, NULL);
97 c->pix_fmt = scale->inputs[0]->format = picref->format;
98 c->w = scale->inputs[0]->w = picref->video->w;
99 c->h = scale->inputs[0]->h = picref->video->h;
101 link = scale->outputs[0];
102 if ((ret = link->srcpad->config_props(link)) < 0)
106 c->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
107 picref->video->w, picref->video->h);
108 av_image_copy(c->picref->data, c->picref->linesize,
109 (void*)picref->data, picref->linesize,
110 picref->format, picref->video->w, picref->video->h);
111 avfilter_copy_buffer_ref_props(c->picref, picref);
116 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
118 BufferSourceContext *c = s->priv;
121 av_log(s, AV_LOG_ERROR,
122 "Buffering several frames is not supported. "
123 "Please consume all available frames before adding a new one.\n"
125 return AVERROR(EINVAL);
136 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_src,
137 const AVFrame *frame, int flags)
140 AVFilterBufferRef *picref =
141 avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
143 return AVERROR(ENOMEM);
144 ret = av_vsrc_buffer_add_video_buffer_ref(buffer_src, picref, flags);
145 picref->buf->data[0] = NULL;
146 avfilter_unref_buffer(picref);
152 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
154 BufferSourceContext *c = ctx->priv;
155 char pix_fmt_str[128];
160 (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
161 &c->time_base.num, &c->time_base.den,
162 &c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den, c->sws_param)) < 7) {
163 av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
164 return AVERROR(EINVAL);
167 if ((ret = ff_parse_pixel_format(&c->pix_fmt, pix_fmt_str, ctx)) < 0)
170 av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",
171 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
172 c->time_base.num, c->time_base.den,
173 c->sample_aspect_ratio.num, c->sample_aspect_ratio.den, c->sws_param);
177 static int query_formats(AVFilterContext *ctx)
179 BufferSourceContext *c = ctx->priv;
180 enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
182 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
186 static int config_props(AVFilterLink *link)
188 BufferSourceContext *c = link->src->priv;
192 link->sample_aspect_ratio = c->sample_aspect_ratio;
193 link->time_base = c->time_base;
198 static int request_frame(AVFilterLink *link)
200 BufferSourceContext *c = link->src->priv;
203 av_log(link->src, AV_LOG_WARNING,
204 "request_frame() called with no available frame!\n");
205 return AVERROR(EINVAL);
208 avfilter_start_frame(link, avfilter_ref_buffer(c->picref, ~0));
209 avfilter_draw_slice(link, 0, link->h, 1);
210 avfilter_end_frame(link);
211 avfilter_unref_buffer(c->picref);
217 static int poll_frame(AVFilterLink *link)
219 BufferSourceContext *c = link->src->priv;
220 return !!(c->picref);
223 AVFilter avfilter_vsrc_buffer = {
225 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
226 .priv_size = sizeof(BufferSourceContext),
227 .query_formats = query_formats,
231 .inputs = (const AVFilterPad[]) {{ .name = NULL }},
232 .outputs = (const AVFilterPad[]) {{ .name = "default",
233 .type = AVMEDIA_TYPE_VIDEO,
234 .request_frame = request_frame,
235 .poll_frame = poll_frame,
236 .config_props = config_props, },