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/*
* Copyright (c) 2008 Vitor Sessak
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* memory buffer source filter
*/
#include "avfilter.h"
#include "buffersrc.h"
#include "vsrc_buffer.h"
#include "libavutil/imgutils.h"
typedef struct {
AVFilterBufferRef *buf;
int h, w;
enum PixelFormat pix_fmt;
AVRational time_base; ///< time_base to set in the output link
AVRational pixel_aspect;
} BufferSourceContext;
#define CHECK_PARAM_CHANGE(s, c, width, height, format)\
if (c->w != width || c->h != height || c->pix_fmt != format) {\
av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
return AVERROR(EINVAL);\
}
int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
int64_t pts, AVRational pixel_aspect)
{
BufferSourceContext *c = buffer_filter->priv;
if (c->buf) {
av_log(buffer_filter, AV_LOG_ERROR,
"Buffering several frames is not supported. "
"Please consume all available frames before adding a new one.\n"
);
//return -1;
}
CHECK_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height, frame->format);
c->buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
c->w, c->h);
av_image_copy(c->buf->data, c->buf->linesize, frame->data, frame->linesize,
c->pix_fmt, c->w, c->h);
avfilter_copy_frame_props(c->buf, frame);
c->buf->pts = pts;
c->buf->video->pixel_aspect = pixel_aspect;
return 0;
}
int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
{
BufferSourceContext *c = s->priv;
if (c->buf) {
av_log(s, AV_LOG_ERROR,
"Buffering several frames is not supported. "
"Please consume all available frames before adding a new one.\n"
);
return AVERROR(EINVAL);
}
CHECK_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
c->buf = buf;
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSourceContext *c = ctx->priv;
char pix_fmt_str[128];
int n = 0;
if (!args ||
(n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
&c->time_base.num, &c->time_base.den,
&c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
return AVERROR(EINVAL);
}
if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
char *tail;
c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
return AVERROR(EINVAL);
}
}
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);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSourceContext *s = ctx->priv;
if (s->buf)
avfilter_unref_buffer(s->buf);
s->buf = NULL;
}
static int query_formats(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static int config_props(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
link->w = c->w;
link->h = c->h;
link->sample_aspect_ratio = c->pixel_aspect;
link->time_base = c->time_base;
return 0;
}
static int request_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
if (!c->buf) {
av_log(link->src, AV_LOG_ERROR,
"request_frame() called with no available frame!\n");
//return -1;
}
avfilter_start_frame(link, avfilter_ref_buffer(c->buf, ~0));
avfilter_draw_slice(link, 0, link->h, 1);
avfilter_end_frame(link);
avfilter_unref_buffer(c->buf);
c->buf = NULL;
return 0;
}
static int poll_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
return !!c->buf;
}
AVFilter avfilter_vsrc_buffer = {
.name = "buffer",
.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
.priv_size = sizeof(BufferSourceContext),
.query_formats = query_formats,
.init = init,
.uninit = uninit,
.inputs = (AVFilterPad[]) {{ .name = NULL }},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.poll_frame = poll_frame,
.config_props = config_props, },
{ .name = NULL}},
};
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