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/*
* Copyright (c) 2008 Vitor Sessak
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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 "avcodec.h"
#include "vsrc_buffer.h"
#include "libavutil/imgutils.h"
typedef struct {
AVFilterBufferRef *picref;
int h, w;
enum PixelFormat pix_fmt;
AVRational time_base; ///< time_base to set in the output link
AVRational sample_aspect_ratio;
char sws_param[256];
} BufferSourceContext;
int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter,
AVFilterBufferRef *picref, int flags)
{
BufferSourceContext *c = buffer_filter->priv;
AVFilterLink *outlink = buffer_filter->outputs[0];
int ret;
if (c->picref) {
if (flags & AV_VSRC_BUF_FLAG_OVERWRITE) {
avfilter_unref_buffer(c->picref);
c->picref = NULL;
} else {
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 AVERROR(EINVAL);
}
}
if (picref->video->w != c->w || picref->video->h != c->h || picref->format != c->pix_fmt) {
AVFilterContext *scale = buffer_filter->outputs[0]->dst;
AVFilterLink *link;
char scale_param[1024];
av_log(buffer_filter, AV_LOG_INFO,
"Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
picref->video->w, picref->video->h, av_pix_fmt_descriptors[picref->format].name);
if (!scale || strcmp(scale->filter->name, "scale")) {
AVFilter *f = avfilter_get_by_name("scale");
av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
if ((ret = avfilter_open(&scale, f, "Input equalizer")) < 0)
return ret;
snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s", c->w, c->h, c->sws_param);
if ((ret = avfilter_init_filter(scale, scale_param, NULL)) < 0) {
avfilter_free(scale);
return ret;
}
if ((ret = avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0)) < 0) {
avfilter_free(scale);
return ret;
}
scale->outputs[0]->time_base = scale->inputs[0]->time_base;
scale->outputs[0]->format= c->pix_fmt;
} else if (!strcmp(scale->filter->name, "scale")) {
snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s",
scale->outputs[0]->w, scale->outputs[0]->h, c->sws_param);
scale->filter->init(scale, scale_param, NULL);
}
c->pix_fmt = scale->inputs[0]->format = picref->format;
c->w = scale->inputs[0]->w = picref->video->w;
c->h = scale->inputs[0]->h = picref->video->h;
link = scale->outputs[0];
if ((ret = link->srcpad->config_props(link)) < 0)
return ret;
}
c->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
picref->video->w, picref->video->h);
av_image_copy(c->picref->data, c->picref->linesize,
picref->data, picref->linesize,
picref->format, picref->video->w, picref->video->h);
avfilter_copy_buffer_ref_props(c->picref, picref);
return 0;
}
#if CONFIG_AVCODEC
#include "avcodec.h"
int av_vsrc_buffer_add_frame(AVFilterContext *buffer_src,
const AVFrame *frame, int flags)
{
int ret;
AVFilterBufferRef *picref =
avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
if (!picref)
return AVERROR(ENOMEM);
ret = av_vsrc_buffer_add_video_buffer_ref(buffer_src, picref, flags);
picref->buf->data[0] = NULL;
avfilter_unref_buffer(picref);
return ret;
}
#endif
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSourceContext *c = ctx->priv;
char pix_fmt_str[128];
int n = 0;
*c->sws_param = 0;
if (!args ||
(n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
&c->time_base.num, &c->time_base.den,
&c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den, c->sws_param)) < 7) {
av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %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 tb:%d/%d sar:%d/%d sws_param:%s\n",
c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
c->time_base.num, c->time_base.den,
c->sample_aspect_ratio.num, c->sample_aspect_ratio.den, c->sws_param);
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_pixel_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->sample_aspect_ratio;
link->time_base = c->time_base;
return 0;
}
static int request_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
if (!c->picref) {
av_log(link->src, AV_LOG_WARNING,
"request_frame() called with no available frame!\n");
return AVERROR(EINVAL);
}
avfilter_start_frame(link, avfilter_ref_buffer(c->picref, ~0));
avfilter_draw_slice(link, 0, link->h, 1);
avfilter_end_frame(link);
avfilter_unref_buffer(c->picref);
c->picref = NULL;
return 0;
}
static int poll_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
return !!(c->picref);
}
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}},
};
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