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
27 #include "buffersrc.h"
28 #include "vsrc_buffer.h"
29 #include "libavutil/fifo.h"
30 #include "libavutil/imgutils.h"
35 enum PixelFormat pix_fmt;
36 AVRational time_base; ///< time_base to set in the output link
37 AVRational pixel_aspect;
38 } BufferSourceContext;
40 #define CHECK_PARAM_CHANGE(s, c, width, height, format)\
41 if (c->w != width || c->h != height || c->pix_fmt != format) {\
42 av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
43 return AVERROR(EINVAL);\
46 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
47 int64_t pts, AVRational pixel_aspect)
49 BufferSourceContext *c = buffer_filter->priv;
50 AVFilterBufferRef *buf;
53 if (!av_fifo_space(c->fifo) &&
54 (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
58 CHECK_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height, frame->format);
60 buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
62 av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
63 c->pix_fmt, c->w, c->h);
65 avfilter_copy_frame_props(buf, frame);
67 buf->video->pixel_aspect = pixel_aspect;
69 if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
70 avfilter_unref_buffer(buf);
77 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
79 BufferSourceContext *c = s->priv;
82 if (!av_fifo_space(c->fifo) &&
83 (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
87 CHECK_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
89 if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0)
95 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
97 BufferSourceContext *c = ctx->priv;
98 char pix_fmt_str[128];
102 (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
103 &c->time_base.num, &c->time_base.den,
104 &c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
105 av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
106 return AVERROR(EINVAL);
108 if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
110 c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
111 if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
112 av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
113 return AVERROR(EINVAL);
117 if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
118 return AVERROR(ENOMEM);
120 av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
124 static av_cold void uninit(AVFilterContext *ctx)
126 BufferSourceContext *s = ctx->priv;
127 while (av_fifo_size(s->fifo)) {
128 AVFilterBufferRef *buf;
129 av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
130 avfilter_unref_buffer(buf);
132 av_fifo_free(s->fifo);
136 static int query_formats(AVFilterContext *ctx)
138 BufferSourceContext *c = ctx->priv;
139 enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
141 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
145 static int config_props(AVFilterLink *link)
147 BufferSourceContext *c = link->src->priv;
151 link->sample_aspect_ratio = c->pixel_aspect;
152 link->time_base = c->time_base;
157 static int request_frame(AVFilterLink *link)
159 BufferSourceContext *c = link->src->priv;
160 AVFilterBufferRef *buf;
162 if (!av_fifo_size(c->fifo)) {
163 av_log(link->src, AV_LOG_ERROR,
164 "request_frame() called with no available frame!\n");
165 return AVERROR(EINVAL);
167 av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
169 avfilter_start_frame(link, avfilter_ref_buffer(buf, ~0));
170 avfilter_draw_slice(link, 0, link->h, 1);
171 avfilter_end_frame(link);
172 avfilter_unref_buffer(buf);
177 static int poll_frame(AVFilterLink *link)
179 BufferSourceContext *c = link->src->priv;
180 return !!av_fifo_size(c->fifo);
183 AVFilter avfilter_vsrc_buffer = {
185 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
186 .priv_size = sizeof(BufferSourceContext),
187 .query_formats = query_formats,
192 .inputs = (AVFilterPad[]) {{ .name = NULL }},
193 .outputs = (AVFilterPad[]) {{ .name = "default",
194 .type = AVMEDIA_TYPE_VIDEO,
195 .request_frame = request_frame,
196 .poll_frame = poll_frame,
197 .config_props = config_props, },