mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
e1d9dbf2d4
It can be used to directly pass a AVFilterBufferRef to lavfi, avoiding a memcpy.
169 lines
5.1 KiB
C
169 lines
5.1 KiB
C
/*
|
|
* 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;
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 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,
|
|
|
|
.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}},
|
|
};
|