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/*
* 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
*/
#include "libavutil/buffer.h"
#include "libavutil/hwcontext.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "video.h"
typedef struct HWDownloadContext {
const AVClass *class;
AVBufferRef *hwframes_ref;
AVHWFramesContext *hwframes;
} HWDownloadContext;
static int hwdownload_query_formats(const AVFilterContext *avctx,
AVFilterFormatsConfig **cfg_in,
AVFilterFormatsConfig **cfg_out)
{
int err;
if ((err = ff_formats_ref(ff_formats_pixdesc_filter(AV_PIX_FMT_FLAG_HWACCEL, 0),
&cfg_in[0]->formats)) ||
(err = ff_formats_ref(ff_formats_pixdesc_filter(0, AV_PIX_FMT_FLAG_HWACCEL),
&cfg_out[0]->formats)))
return err;
return 0;
}
static int hwdownload_config_input(AVFilterLink *inlink)
{
FilterLink *l = ff_filter_link(inlink);
AVFilterContext *avctx = inlink->dst;
HWDownloadContext *ctx = avctx->priv;
av_buffer_unref(&ctx->hwframes_ref);
if (!l->hw_frames_ctx) {
av_log(ctx, AV_LOG_ERROR, "The input must have a hardware frame "
"reference.\n");
return AVERROR(EINVAL);
}
ctx->hwframes_ref = av_buffer_ref(l->hw_frames_ctx);
if (!ctx->hwframes_ref)
return AVERROR(ENOMEM);
ctx->hwframes = (AVHWFramesContext*)ctx->hwframes_ref->data;
return 0;
}
static int hwdownload_config_output(AVFilterLink *outlink)
{
AVFilterContext *avctx = outlink->src;
AVFilterLink *inlink = avctx->inputs[0];
HWDownloadContext *ctx = avctx->priv;
enum AVPixelFormat *formats;
int err, i, found;
if (!ctx->hwframes_ref)
return AVERROR(EINVAL);
err = av_hwframe_transfer_get_formats(ctx->hwframes_ref,
AV_HWFRAME_TRANSFER_DIRECTION_FROM,
&formats, 0);
if (err < 0)
return err;
found = 0;
for (i = 0; formats[i] != AV_PIX_FMT_NONE; i++) {
if (formats[i] == outlink->format) {
found = 1;
break;
}
}
av_freep(&formats);
if (!found) {
av_log(ctx, AV_LOG_ERROR, "Invalid output format %s for hwframe "
"download.\n", av_get_pix_fmt_name(outlink->format));
return AVERROR(EINVAL);
}
outlink->w = inlink->w;
outlink->h = inlink->h;
return 0;
}
static int hwdownload_filter_frame(AVFilterLink *link, AVFrame *input)
{
AVFilterContext *avctx = link->dst;
AVFilterLink *outlink = avctx->outputs[0];
HWDownloadContext *ctx = avctx->priv;
AVFrame *output = NULL;
int err;
if (!ctx->hwframes_ref || !input->hw_frames_ctx) {
av_log(ctx, AV_LOG_ERROR, "Input frames must have hardware context.\n");
err = AVERROR(EINVAL);
goto fail;
}
if ((void*)ctx->hwframes != input->hw_frames_ctx->data) {
av_log(ctx, AV_LOG_ERROR, "Input frame is not the in the configured "
"hwframe context.\n");
err = AVERROR(EINVAL);
goto fail;
}
output = ff_get_video_buffer(outlink, ctx->hwframes->width,
ctx->hwframes->height);
if (!output) {
err = AVERROR(ENOMEM);
goto fail;
}
err = av_hwframe_transfer_data(output, input, 0);
if (err < 0) {
av_log(ctx, AV_LOG_ERROR, "Failed to download frame: %d.\n", err);
goto fail;
}
output->width = outlink->w;
output->height = outlink->h;
err = av_frame_copy_props(output, input);
if (err < 0)
goto fail;
av_frame_free(&input);
return ff_filter_frame(avctx->outputs[0], output);
fail:
av_frame_free(&input);
av_frame_free(&output);
return err;
}
static av_cold void hwdownload_uninit(AVFilterContext *avctx)
{
HWDownloadContext *ctx = avctx->priv;
av_buffer_unref(&ctx->hwframes_ref);
}
static const AVClass hwdownload_class = {
.class_name = "hwdownload",
.item_name = av_default_item_name,
.option = NULL,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVFilterPad hwdownload_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = hwdownload_config_input,
.filter_frame = hwdownload_filter_frame,
},
};
static const AVFilterPad hwdownload_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = hwdownload_config_output,
},
};
const AVFilter ff_vf_hwdownload = {
.name = "hwdownload",
.description = NULL_IF_CONFIG_SMALL("Download a hardware frame to a normal frame"),
.uninit = hwdownload_uninit,
.priv_size = sizeof(HWDownloadContext),
.priv_class = &hwdownload_class,
FILTER_INPUTS(hwdownload_inputs),
FILTER_OUTPUTS(hwdownload_outputs),
FILTER_QUERY_FUNC2(hwdownload_query_formats),
.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
};
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