mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
7 years ago
parent
59365e6345
commit
ec5328aa6f
6 changed files with 316 additions and 2 deletions
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/*
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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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