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 "vsrc_buffer.h"
29 #include "libavutil/imgutils.h"
32 AVFilterBufferRef *picref;
34 enum PixelFormat pix_fmt;
35 AVRational time_base; ///< time_base to set in the output link
36 AVRational sample_aspect_ratio;
38 } BufferSourceContext;
40 int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter,
41 AVFilterBufferRef *picref, int flags)
43 BufferSourceContext *c = buffer_filter->priv;
44 AVFilterLink *outlink = buffer_filter->outputs[0];
48 if (flags & AV_VSRC_BUF_FLAG_OVERWRITE) {
49 avfilter_unref_buffer(c->picref);
52 av_log(buffer_filter, AV_LOG_ERROR,
53 "Buffering several frames is not supported. "
54 "Please consume all available frames before adding a new one.\n");
55 return AVERROR(EINVAL);
59 if (picref->video->w != c->w || picref->video->h != c->h || picref->format != c->pix_fmt) {
60 AVFilterContext *scale = buffer_filter->outputs[0]->dst;
62 char scale_param[1024];
64 av_log(buffer_filter, AV_LOG_INFO,
65 "Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
66 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
67 picref->video->w, picref->video->h, av_pix_fmt_descriptors[picref->format].name);
69 if (!scale || strcmp(scale->filter->name, "scale")) {
70 AVFilter *f = avfilter_get_by_name("scale");
72 av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
73 if ((ret = avfilter_open(&scale, f, "Input equalizer")) < 0)
76 snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s", c->w, c->h, c->sws_param);
77 if ((ret = avfilter_init_filter(scale, scale_param, NULL)) < 0) {
82 if ((ret = avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0)) < 0) {
86 scale->outputs[0]->time_base = scale->inputs[0]->time_base;
88 scale->outputs[0]->format= c->pix_fmt;
89 } else if (!strcmp(scale->filter->name, "scale")) {
90 snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s",
91 scale->outputs[0]->w, scale->outputs[0]->h, c->sws_param);
92 scale->filter->init(scale, scale_param, NULL);
95 c->pix_fmt = scale->inputs[0]->format = picref->format;
96 c->w = scale->inputs[0]->w = picref->video->w;
97 c->h = scale->inputs[0]->h = picref->video->h;
99 link = scale->outputs[0];
100 if ((ret = link->srcpad->config_props(link)) < 0)
104 c->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
105 picref->video->w, picref->video->h);
106 av_image_copy(c->picref->data, c->picref->linesize,
107 picref->data, picref->linesize,
108 picref->format, picref->video->w, picref->video->h);
109 avfilter_copy_buffer_ref_props(c->picref, picref);
117 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_src,
118 const AVFrame *frame, int flags)
121 AVFilterBufferRef *picref =
122 avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
124 return AVERROR(ENOMEM);
125 ret = av_vsrc_buffer_add_video_buffer_ref(buffer_src, picref, flags);
126 picref->buf->data[0] = NULL;
127 avfilter_unref_buffer(picref);
133 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
135 BufferSourceContext *c = ctx->priv;
136 char pix_fmt_str[128];
141 (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
142 &c->time_base.num, &c->time_base.den,
143 &c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den, c->sws_param)) < 7) {
144 av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
145 return AVERROR(EINVAL);
148 if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
150 c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
151 if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
152 av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
153 return AVERROR(EINVAL);
157 av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",
158 c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
159 c->time_base.num, c->time_base.den,
160 c->sample_aspect_ratio.num, c->sample_aspect_ratio.den, c->sws_param);
164 static int query_formats(AVFilterContext *ctx)
166 BufferSourceContext *c = ctx->priv;
167 enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
169 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
173 static int config_props(AVFilterLink *link)
175 BufferSourceContext *c = link->src->priv;
179 link->sample_aspect_ratio = c->sample_aspect_ratio;
180 link->time_base = c->time_base;
185 static int request_frame(AVFilterLink *link)
187 BufferSourceContext *c = link->src->priv;
190 av_log(link->src, AV_LOG_WARNING,
191 "request_frame() called with no available frame!\n");
192 return AVERROR(EINVAL);
195 avfilter_start_frame(link, avfilter_ref_buffer(c->picref, ~0));
196 avfilter_draw_slice(link, 0, link->h, 1);
197 avfilter_end_frame(link);
198 avfilter_unref_buffer(c->picref);
204 static int poll_frame(AVFilterLink *link)
206 BufferSourceContext *c = link->src->priv;
207 return !!(c->picref);
210 AVFilter avfilter_vsrc_buffer = {
212 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
213 .priv_size = sizeof(BufferSourceContext),
214 .query_formats = query_formats,
218 .inputs = (AVFilterPad[]) {{ .name = NULL }},
219 .outputs = (AVFilterPad[]) {{ .name = "default",
220 .type = AVMEDIA_TYPE_VIDEO,
221 .request_frame = request_frame,
222 .poll_frame = poll_frame,
223 .config_props = config_props, },