vf_transpose.c 7.95 KB
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/*
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 * Copyright (c) 2010 Stefano Sabatini
 * Copyright (c) 2008 Vitor Sessak
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * transposition filter
 * Based on MPlayer libmpcodecs/vf_rotate.c.
 */

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#include <stdio.h>

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#include "libavutil/imgutils.h"
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#include "libavutil/internal.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 "video.h"
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enum TransposeDir {
    TRANSPOSE_CCLOCK_FLIP,
    TRANSPOSE_CLOCK,
    TRANSPOSE_CCLOCK,
    TRANSPOSE_CLOCK_FLIP,
};

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typedef struct TransContext {
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    const AVClass *class;
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    int hsub, vsub;
    int pixsteps[4];

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    enum TransposeDir dir;
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} TransContext;

static int query_formats(AVFilterContext *ctx)
{
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    enum AVPixelFormat pix_fmts[] = {
        AV_PIX_FMT_ARGB,         AV_PIX_FMT_RGBA,
        AV_PIX_FMT_ABGR,         AV_PIX_FMT_BGRA,
        AV_PIX_FMT_RGB24,        AV_PIX_FMT_BGR24,
        AV_PIX_FMT_RGB565BE,     AV_PIX_FMT_RGB565LE,
        AV_PIX_FMT_RGB555BE,     AV_PIX_FMT_RGB555LE,
        AV_PIX_FMT_BGR565BE,     AV_PIX_FMT_BGR565LE,
        AV_PIX_FMT_BGR555BE,     AV_PIX_FMT_BGR555LE,
        AV_PIX_FMT_GRAY16BE,     AV_PIX_FMT_GRAY16LE,
        AV_PIX_FMT_YUV420P16LE,  AV_PIX_FMT_YUV420P16BE,
        AV_PIX_FMT_YUV422P16LE,  AV_PIX_FMT_YUV422P16BE,
        AV_PIX_FMT_YUV444P16LE,  AV_PIX_FMT_YUV444P16BE,
        AV_PIX_FMT_NV12,         AV_PIX_FMT_NV21,
        AV_PIX_FMT_RGB8,         AV_PIX_FMT_BGR8,
        AV_PIX_FMT_RGB4_BYTE,    AV_PIX_FMT_BGR4_BYTE,
        AV_PIX_FMT_YUV444P,      AV_PIX_FMT_YUV422P,
        AV_PIX_FMT_YUV420P,      AV_PIX_FMT_YUVJ420P,
        AV_PIX_FMT_YUV411P,      AV_PIX_FMT_YUV410P,
        AV_PIX_FMT_YUVJ444P,     AV_PIX_FMT_YUVJ422P,
        AV_PIX_FMT_YUV440P,      AV_PIX_FMT_YUVJ440P,
        AV_PIX_FMT_YUVA420P,     AV_PIX_FMT_GRAY8,
        AV_PIX_FMT_NONE
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    };

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    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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    return 0;
}

static int config_props_output(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    TransContext *trans = ctx->priv;
    AVFilterLink *inlink = ctx->inputs[0];
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    const AVPixFmtDescriptor *desc_out = av_pix_fmt_desc_get(outlink->format);
    const AVPixFmtDescriptor *desc_in  = av_pix_fmt_desc_get(inlink->format);
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    trans->hsub = desc_in->log2_chroma_w;
    trans->vsub = desc_in->log2_chroma_h;
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    av_image_fill_max_pixsteps(trans->pixsteps, NULL, desc_out);
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    outlink->w = inlink->h;
    outlink->h = inlink->w;

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    if (inlink->sample_aspect_ratio.num)
        outlink->sample_aspect_ratio = av_div_q((AVRational) { 1, 1 },
                                                inlink->sample_aspect_ratio);
    else
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        outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

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    av_log(ctx, AV_LOG_VERBOSE,
           "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,
           trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
           trans->dir == 0 || trans->dir == 3);
    return 0;
}

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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
    AVFilterLink *outlink = inlink->dst->outputs[0];
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    TransContext *trans = inlink->dst->priv;
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    AVFrame *out;
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    int plane;
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    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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    if (!out) {
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        av_frame_free(&in);
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        return AVERROR(ENOMEM);
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    }
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    out->pts = in->pts;
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    if (in->sample_aspect_ratio.num == 0) {
        out->sample_aspect_ratio = in->sample_aspect_ratio;
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    } else {
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        out->sample_aspect_ratio.num = in->sample_aspect_ratio.den;
        out->sample_aspect_ratio.den = in->sample_aspect_ratio.num;
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    }

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    for (plane = 0; out->data[plane]; plane++) {
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        int hsub    = plane == 1 || plane == 2 ? trans->hsub : 0;
        int vsub    = plane == 1 || plane == 2 ? trans->vsub : 0;
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        int pixstep = trans->pixsteps[plane];
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        int inh     = in->height >> vsub;
        int outw    = out->width >> hsub;
        int outh    = out->height >> vsub;
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        uint8_t *dst, *src;
        int dstlinesize, srclinesize;
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        int x, y;

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        dst         = out->data[plane];
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        dstlinesize = out->linesize[plane];
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        src         = in->data[plane];
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        srclinesize = in->linesize[plane];
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        if (trans->dir & 1) {
            src         += in->linesize[plane] * (inh - 1);
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            srclinesize *= -1;
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        }

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        if (trans->dir & 2) {
            dst         += out->linesize[plane] * (outh - 1);
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            dstlinesize *= -1;
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        }

        for (y = 0; y < outh; y++) {
            switch (pixstep) {
            case 1:
                for (x = 0; x < outw; x++)
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                    dst[x] = src[x * srclinesize + y];
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                break;
            case 2:
                for (x = 0; x < outw; x++)
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                    *((uint16_t *)(dst + 2 * x)) =
                        *((uint16_t *)(src + x * srclinesize + y * 2));
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                break;
            case 3:
                for (x = 0; x < outw; x++) {
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                    int32_t v = AV_RB24(src + x * srclinesize + y * 3);
                    AV_WB24(dst + 3 * x, v);
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                }
                break;
            case 4:
                for (x = 0; x < outw; x++)
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                    *((uint32_t *)(dst + 4 * x)) =
                        *((uint32_t *)(src + x * srclinesize + y * 4));
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                break;
            }
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            dst += dstlinesize;
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        }
    }

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    av_frame_free(&in);
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    return ff_filter_frame(outlink, out);
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}

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#define OFFSET(x) offsetof(TransContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
    { "dir", "Transpose direction", OFFSET(dir), AV_OPT_TYPE_INT, { .i64 = TRANSPOSE_CCLOCK_FLIP },
        TRANSPOSE_CCLOCK_FLIP, TRANSPOSE_CLOCK_FLIP, FLAGS, "dir" },
        { "cclock_flip", "counter-clockwise with vertical flip", 0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CCLOCK_FLIP }, .unit = "dir" },
        { "clock",       "clockwise",                            0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CLOCK       }, .unit = "dir" },
        { "cclock",      "counter-clockwise",                    0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CCLOCK      }, .unit = "dir" },
        { "clock_flip",  "clockwise with vertical flip",         0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CLOCK_FLIP  }, .unit = "dir" },
    { NULL },
};

static const AVClass transpose_class = {
    .class_name = "transpose",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

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static const AVFilterPad avfilter_vf_transpose_inputs[] = {
    {
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        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
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        .filter_frame = filter_frame,
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    },
    { NULL }
};

static const AVFilterPad avfilter_vf_transpose_outputs[] = {
    {
        .name         = "default",
        .config_props = config_props_output,
        .type         = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

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AVFilter ff_vf_transpose = {
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    .name          = "transpose",
    .description   = NULL_IF_CONFIG_SMALL("Transpose input video."),
    .priv_size     = sizeof(TransContext),
    .priv_class    = &transpose_class,
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    .query_formats = query_formats,
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    .inputs        = avfilter_vf_transpose_inputs,
    .outputs       = avfilter_vf_transpose_outputs,
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};