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/*
* Copyright (c) 2018 Paul B Mahol
*
* 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/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "filters.h"
#include "internal.h"
#include "formats.h"
#include "drawutils.h"
typedef struct TPadContext {
const AVClass *class;
int pad_start;
int pad_stop;
int start_mode;
int stop_mode;
int64_t start_duration;
int64_t stop_duration;
uint8_t rgba_color[4]; ///< color for the padding area
FFDrawContext draw;
FFDrawColor color;
int64_t pts;
int eof;
AVFrame *cache_start;
AVFrame *cache_stop;
} TPadContext;
#define OFFSET(x) offsetof(TPadContext, x)
#define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption tpad_options[] = {
{ "start", "set the number of frames to delay input", OFFSET(pad_start), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, VF },
{ "stop", "set the number of frames to add after input finished", OFFSET(pad_stop), AV_OPT_TYPE_INT, {.i64=0}, -1, INT_MAX, VF },
{ "start_mode", "set the mode of added frames to start", OFFSET(start_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, VF, "mode" },
{ "add", "add solid-color frames", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, VF, "mode" },
{ "clone", "clone first/last frame", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, VF, "mode" },
{ "stop_mode", "set the mode of added frames to end", OFFSET(stop_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, VF, "mode" },
{ "start_duration", "set the duration to delay input", OFFSET(start_duration), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT64_MAX, VF },
{ "stop_duration", "set the duration to pad input", OFFSET(stop_duration), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT64_MAX, VF },
{ "color", "set the color of the added frames", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, VF },
{ NULL }
};
AVFILTER_DEFINE_CLASS(tpad);
static int query_formats(AVFilterContext *ctx)
{
return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
TPadContext *s = ctx->priv;
AVFrame *frame = NULL;
int ret, status;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (s->start_mode == 0 && s->pad_start > 0 && ff_outlink_frame_wanted(outlink)) {
frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!frame)
return AVERROR(ENOMEM);
ff_fill_rectangle(&s->draw, &s->color,
frame->data, frame->linesize,
0, 0, frame->width, frame->height);
frame->pts = s->pts;
s->pts += av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
s->pad_start--;
return ff_filter_frame(outlink, frame);
}
if (s->start_mode == 1 && s->pad_start > 0) {
if (!s->cache_start && ff_inlink_queued_frames(inlink)) {
s->cache_start = ff_inlink_peek_frame(inlink, 0);
} else if (!s->cache_start) {
FF_FILTER_FORWARD_WANTED(outlink, inlink);
}
frame = av_frame_clone(s->cache_start);
if (!frame)
return AVERROR(ENOMEM);
frame->pts = s->pts;
s->pts += av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
s->pad_start--;
if (s->pad_start == 0)
s->cache_start = NULL;
return ff_filter_frame(outlink, frame);
}
if (!s->eof && !s->pad_start) {
ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
if (ret > 0) {
if (s->stop_mode == 1 && s->pad_stop != 0) {
av_frame_free(&s->cache_stop);
s->cache_stop = av_frame_clone(frame);
}
frame->pts += s->pts;
return ff_filter_frame(outlink, frame);
}
}
if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
if (status == AVERROR_EOF) {
if (!s->pad_stop) {
ff_outlink_set_status(outlink, status, pts);
return 0;
}
s->eof = 1;
s->pts += pts;
}
}
if (s->eof) {
if (!s->pad_stop) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
return 0;
}
if (s->stop_mode == 0) {
frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!frame)
return AVERROR(ENOMEM);
ff_fill_rectangle(&s->draw, &s->color,
frame->data, frame->linesize,
0, 0, frame->width, frame->height);
} else if (s->stop_mode == 1) {
frame = av_frame_clone(s->cache_stop);
if (!frame)
return AVERROR(ENOMEM);
}
frame->pts = s->pts;
s->pts += av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
if (s->pad_stop > 0)
s->pad_stop--;
return ff_filter_frame(outlink, frame);
}
if (!s->pad_start)
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
TPadContext *s = ctx->priv;
ff_draw_init(&s->draw, inlink->format, 0);
ff_draw_color(&s->draw, &s->color, s->rgba_color);
if (s->start_duration)
s->pad_start = av_rescale_q(s->start_duration, inlink->frame_rate, av_inv_q(AV_TIME_BASE_Q));
if (s->stop_duration)
s->pad_stop = av_rescale_q(s->stop_duration, inlink->frame_rate, av_inv_q(AV_TIME_BASE_Q));
return 0;
}
static void uninit(AVFilterContext *ctx)
{
TPadContext *s = ctx->priv;
av_frame_free(&s->cache_stop);
}
static const AVFilterPad tpad_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad tpad_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_tpad = {
.name = "tpad",
.description = NULL_IF_CONFIG_SMALL("Temporarily pad video frames."),
.priv_size = sizeof(TPadContext),
.priv_class = &tpad_class,
.query_formats = query_formats,
.activate = activate,
.uninit = uninit,
.inputs = tpad_inputs,
.outputs = tpad_outputs,
};
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