284 lines
8.2 KiB
C
284 lines
8.2 KiB
C
/*
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* Copyright (c) 2017 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "framesync.h"
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#include "video.h"
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typedef struct MixContext {
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const AVClass *class;
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const AVPixFmtDescriptor *desc;
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char *weights_str;
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int nb_inputs;
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int duration;
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float *weights;
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float wfactor;
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int depth;
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int nb_planes;
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int linesize[4];
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int height[4];
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AVFrame **frames;
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FFFrameSync fs;
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} MixContext;
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *pix_fmts = NULL;
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int fmt, ret;
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for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
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desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
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desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
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(ret = ff_add_format(&pix_fmts, fmt)) < 0)
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return ret;
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}
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return ff_set_common_formats(ctx, pix_fmts);
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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MixContext *s = ctx->priv;
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char *p, *arg, *saveptr = NULL;
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int i, ret;
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s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
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if (!s->frames)
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return AVERROR(ENOMEM);
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s->weights = av_calloc(s->nb_inputs, sizeof(*s->weights));
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if (!s->weights)
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return AVERROR(ENOMEM);
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for (i = 0; i < s->nb_inputs; i++) {
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AVFilterPad pad = { 0 };
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pad.type = AVMEDIA_TYPE_VIDEO;
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pad.name = av_asprintf("input%d", i);
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if (!pad.name)
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return AVERROR(ENOMEM);
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if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
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av_freep(&pad.name);
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return ret;
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}
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}
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p = s->weights_str;
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for (i = 0; i < s->nb_inputs; i++) {
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if (!(arg = av_strtok(p, " ", &saveptr)))
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break;
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p = NULL;
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sscanf(arg, "%f", &s->weights[i]);
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s->wfactor += s->weights[i];
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}
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s->wfactor = 1 / s->wfactor;
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return 0;
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}
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static int process_frame(FFFrameSync *fs)
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{
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AVFilterContext *ctx = fs->parent;
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AVFilterLink *outlink = ctx->outputs[0];
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MixContext *s = fs->opaque;
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AVFrame **in = s->frames;
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AVFrame *out;
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int i, p, ret, x, y;
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for (i = 0; i < s->nb_inputs; i++) {
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if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
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return ret;
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}
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out)
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return AVERROR(ENOMEM);
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out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
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if (s->depth <= 8) {
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for (p = 0; p < s->nb_planes; p++) {
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uint8_t *dst = out->data[p];
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for (y = 0; y < s->height[p]; y++) {
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for (x = 0; x < s->linesize[p]; x++) {
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int val = 0;
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for (i = 0; i < s->nb_inputs; i++) {
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uint8_t src = in[i]->data[p][y * s->linesize[p] + x];
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val += src * s->weights[i];
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}
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dst[x] = val * s->wfactor;
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}
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dst += out->linesize[p];
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}
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}
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} else {
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for (p = 0; p < s->nb_planes; p++) {
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uint16_t *dst = (uint16_t *)out->data[p];
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for (y = 0; y < s->height[p]; y++) {
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for (x = 0; x < s->linesize[p]; x++) {
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int val = 0;
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for (i = 0; i < s->nb_inputs; i++) {
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uint16_t src = AV_RN16(in[i]->data[p] + y * s->linesize[p] + x * 2);
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val += src * s->weights[i];
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}
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dst[x] = val * s->wfactor;
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}
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dst += out->linesize[p] / 2;
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}
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}
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}
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return ff_filter_frame(outlink, out);
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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MixContext *s = ctx->priv;
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AVRational time_base = ctx->inputs[0]->time_base;
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AVRational frame_rate = ctx->inputs[0]->frame_rate;
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AVFilterLink *inlink = ctx->inputs[0];
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int height = ctx->inputs[0]->h;
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int width = ctx->inputs[0]->w;
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FFFrameSyncIn *in;
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int i, ret;
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for (i = 1; i < s->nb_inputs; i++) {
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if (ctx->inputs[i]->h != height || ctx->inputs[i]->w != width) {
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av_log(ctx, AV_LOG_ERROR, "Input %d size (%dx%d) does not match input %d size (%dx%d).\n", i, ctx->inputs[i]->w, ctx->inputs[i]->h, 0, width, height);
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return AVERROR(EINVAL);
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}
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}
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s->desc = av_pix_fmt_desc_get(outlink->format);
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if (!s->desc)
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return AVERROR_BUG;
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s->nb_planes = av_pix_fmt_count_planes(outlink->format);
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s->depth = s->desc->comp[0].depth;
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outlink->w = width;
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outlink->h = height;
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outlink->time_base = time_base;
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outlink->frame_rate = frame_rate;
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if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
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return ret;
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in = s->fs.in;
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s->fs.opaque = s;
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s->fs.on_event = process_frame;
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if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
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return ret;
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s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
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s->height[0] = s->height[3] = inlink->h;
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for (i = 0; i < s->nb_inputs; i++) {
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AVFilterLink *inlink = ctx->inputs[i];
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in[i].time_base = inlink->time_base;
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in[i].sync = 1;
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in[i].before = EXT_STOP;
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in[i].after = (s->duration == 1 || (s->duration == 2 && i == 0)) ? EXT_STOP : EXT_INFINITY;
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}
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return ff_framesync_configure(&s->fs);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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MixContext *s = ctx->priv;
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int i;
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ff_framesync_uninit(&s->fs);
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av_freep(&s->frames);
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av_freep(&s->weights);
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for (i = 0; i < ctx->nb_inputs; i++)
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av_freep(&ctx->input_pads[i].name);
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}
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static int activate(AVFilterContext *ctx)
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{
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MixContext *s = ctx->priv;
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return ff_framesync_activate(&s->fs);
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}
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#define OFFSET(x) offsetof(MixContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption mix_options[] = {
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{ "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
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{ "weights", "set weight for each input", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1"}, 0, 0, .flags = FLAGS },
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{ "duration", "how to determine end of stream", OFFSET(duration), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, .flags = FLAGS, "duration" },
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{ "longest", "Duration of longest input", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "duration" },
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{ "shortest", "Duration of shortest input", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "duration" },
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{ "first", "Duration of first input", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "duration" },
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{ NULL },
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(mix);
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AVFilter ff_vf_mix = {
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.name = "mix",
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.description = NULL_IF_CONFIG_SMALL("Mix video inputs."),
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.priv_size = sizeof(MixContext),
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.priv_class = &mix_class,
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.query_formats = query_formats,
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.outputs = outputs,
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.init = init,
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.uninit = uninit,
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.activate = activate,
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.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
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};
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