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ffmpeg / libavfilter / vf_transpose.c @ a242ac36

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/*
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 * Copyright (c) 2010 Stefano Sabatini
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 * Copyright (c) 2008 Vitor Sessak
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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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/**
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 * @file
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 * transposition filter
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 * Based on MPlayer libmpcodecs/vf_rotate.c.
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 */
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixdesc.h"
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#include "libavcore/imgutils.h"
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#include "avfilter.h"
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typedef struct {
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    int hsub, vsub;
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    int pixsteps[4];
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    /* 0    Rotate by 90 degrees counterclockwise and vflip. */
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    /* 1    Rotate by 90 degrees clockwise.                  */
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    /* 2    Rotate by 90 degrees counterclockwise.           */
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    /* 3    Rotate by 90 degrees clockwise and vflip.        */
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    int dir;
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} TransContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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    TransContext *trans = ctx->priv;
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    trans->dir = 0;
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    if (args)
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        sscanf(args, "%d", &trans->dir);
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    if (trans->dir < 0 || trans->dir > 3) {
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        av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 3.\n",
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               trans->dir);
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        return AVERROR(EINVAL);
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    }
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    return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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    enum PixelFormat pix_fmts[] = {
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        PIX_FMT_ARGB,         PIX_FMT_RGBA,
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        PIX_FMT_ABGR,         PIX_FMT_BGRA,
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        PIX_FMT_RGB24,        PIX_FMT_BGR24,
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        PIX_FMT_RGB565BE,     PIX_FMT_RGB565LE,
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        PIX_FMT_RGB555BE,     PIX_FMT_RGB555LE,
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        PIX_FMT_BGR565BE,     PIX_FMT_BGR565LE,
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        PIX_FMT_BGR555BE,     PIX_FMT_BGR555LE,
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        PIX_FMT_GRAY16BE,     PIX_FMT_GRAY16LE,
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        PIX_FMT_YUV420P16LE,  PIX_FMT_YUV420P16BE,
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        PIX_FMT_YUV422P16LE,  PIX_FMT_YUV422P16BE,
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        PIX_FMT_YUV444P16LE,  PIX_FMT_YUV444P16BE,
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        PIX_FMT_NV12,         PIX_FMT_NV21,
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        PIX_FMT_RGB8,         PIX_FMT_BGR8,
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        PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
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        PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
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        PIX_FMT_YUV420P,      PIX_FMT_YUVJ420P,
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        PIX_FMT_YUV411P,      PIX_FMT_YUV410P,
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        PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
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        PIX_FMT_YUV440P,      PIX_FMT_YUVJ440P,
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        PIX_FMT_YUVA420P,     PIX_FMT_GRAY8,
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        PIX_FMT_NONE
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    };
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    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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    return 0;
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}
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static int config_props_output(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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    TransContext *trans = ctx->priv;
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    AVFilterLink *inlink = ctx->inputs[0];
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    const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
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    trans->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
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    trans->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
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    av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
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    outlink->w = inlink->h;
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    outlink->h = inlink->w;
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    av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
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           inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
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           trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
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           trans->dir == 0 || trans->dir == 3);
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    return 0;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
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{
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    AVFilterLink *outlink = inlink->dst->outputs[0];
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    outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
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                                                 outlink->w, outlink->h);
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    outlink->out_buf->pts = picref->pts;
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    if (picref->video->pixel_aspect.num == 0) {
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        outlink->out_buf->video->pixel_aspect = picref->video->pixel_aspect;
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    } else {
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        outlink->out_buf->video->pixel_aspect.num = picref->video->pixel_aspect.den;
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        outlink->out_buf->video->pixel_aspect.den = picref->video->pixel_aspect.num;
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    }
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    avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
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}
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static void end_frame(AVFilterLink *inlink)
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{
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    TransContext *trans = inlink->dst->priv;
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    AVFilterBufferRef *inpic  = inlink->cur_buf;
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    AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
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    AVFilterLink *outlink = inlink->dst->outputs[0];
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    int plane;
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    for (plane = 0; outpic->data[plane]; plane++) {
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        int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
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        int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
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        int pixstep = trans->pixsteps[plane];
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        int inh  = inpic->video->h>>vsub;
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        int outw = outpic->video->w>>hsub;
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        int outh = outpic->video->h>>vsub;
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        uint8_t *out, *in;
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        int outlinesize, inlinesize;
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        int x, y;
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        out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
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        in  = inpic ->data[plane]; inlinesize  = inpic ->linesize[plane];
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        if (trans->dir&1) {
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            in +=  inpic->linesize[plane] * (inh-1);
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            inlinesize *= -1;
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        }
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        if (trans->dir&2) {
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            out += outpic->linesize[plane] * (outh-1);
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            outlinesize *= -1;
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        }
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        for (y = 0; y < outh; y++) {
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            switch (pixstep) {
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            case 1:
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                for (x = 0; x < outw; x++)
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                    out[x] = in[x*inlinesize + y];
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                break;
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            case 2:
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                for (x = 0; x < outw; x++)
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                    *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
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                break;
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            case 3:
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                for (x = 0; x < outw; x++) {
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                    int32_t v = AV_RB24(in + x*inlinesize + y*3);
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                    AV_WB24(out + 3*x, v);
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                }
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                break;
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            case 4:
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                for (x = 0; x < outw; x++)
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                    *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
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                break;
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            }
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            out += outlinesize;
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        }
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    }
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    avfilter_unref_buffer(inpic);
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    avfilter_draw_slice(outlink, 0, outpic->video->h, 1);
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    avfilter_end_frame(outlink);
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    avfilter_unref_buffer(outpic);
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}
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AVFilter avfilter_vf_transpose = {
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    .name      = "transpose",
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    .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
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    .init = init,
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    .priv_size = sizeof(TransContext),
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    .query_formats = query_formats,
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    .inputs    = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO,
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                                    .start_frame     = start_frame,
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                                    .end_frame       = end_frame,
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                                    .min_perms       = AV_PERM_READ, },
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                                  { .name = NULL}},
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    .outputs   = (AVFilterPad[]) {{ .name            = "default",
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                                    .config_props    = config_props_output,
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                                    .type            = AVMEDIA_TYPE_VIDEO, },
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                                  { .name = NULL}},
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};