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/*

 * Copyright (c) 2010 Stefano Sabatini

 * Copyright (c) 2008 Vitor Sessak

 *

 * 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

 */

/**

 * @file

 * transposition filter

 * Based on MPlayer libmpcodecs/vf_rotate.c.

 */

#include 

#include "libavutil/imgutils.h"

#include "libavutil/internal.h"

#include "libavutil/intreadwrite.h"

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "avfilter.h"

#include "formats.h"

#include "internal.h"

#include "video.h"

typedef enum {

    TRANSPOSE_PT_TYPE_NONE,

    TRANSPOSE_PT_TYPE_LANDSCAPE,

    TRANSPOSE_PT_TYPE_PORTRAIT,

} PassthroughType;

enum TransposeDir {

    TRANSPOSE_CCLOCK_FLIP,

    TRANSPOSE_CLOCK,

    TRANSPOSE_CCLOCK,

    TRANSPOSE_CLOCK_FLIP,

};

typedef struct TransContext {

    const AVClass *class;

    int hsub, vsub;

    int pixsteps[4];

    int passthrough;    ///< PassthroughType, landscape passthrough mode enabled

    int dir;            ///< TransposeDir

} TransContext;

static int query_formats(AVFilterContext *ctx)

{

    AVFilterFormats *pix_fmts = NULL;

    int fmt;

    for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {

        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);

        if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||

              desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||

              desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||

              desc->log2_chroma_w != desc->log2_chroma_h))

            ff_add_format(&pix_fmts, fmt);

    }

    return ff_set_common_formats(ctx, pix_fmts);

}

static int config_props_output(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    TransContext *trans = ctx->priv;

    AVFilterLink *inlink = ctx->inputs[0];

    const AVPixFmtDescriptor *desc_out = av_pix_fmt_desc_get(outlink->format);

    const AVPixFmtDescriptor *desc_in  = av_pix_fmt_desc_get(inlink->format);

    if (trans->dir&4) {

        av_log(ctx, AV_LOG_WARNING,

               "dir values greater than 3 are deprecated, use the passthrough option instead\n");

        trans->dir &= 3;

        trans->passthrough = TRANSPOSE_PT_TYPE_LANDSCAPE;

    }

    if ((inlink->w >= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_LANDSCAPE) ||

        (inlink->w <= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_PORTRAIT)) {

        av_log(ctx, AV_LOG_VERBOSE,

               "w:%d h:%d -> w:%d h:%d (passthrough mode)\n",

               inlink->w, inlink->h, inlink->w, inlink->h);

        return 0;

    } else {

        trans->passthrough = TRANSPOSE_PT_TYPE_NONE;

    }

    trans->hsub = desc_in->log2_chroma_w;

    trans->vsub = desc_in->log2_chroma_h;

    av_image_fill_max_pixsteps(trans->pixsteps, NULL, desc_out);

    outlink->w = inlink->h;

    outlink->h = inlink->w;

    if (inlink->sample_aspect_ratio.num)

        outlink->sample_aspect_ratio = av_div_q((AVRational) { 1, 1 },

                                                inlink->sample_aspect_ratio);

    else

        outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

    av_log(ctx, AV_LOG_VERBOSE,

           "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",

           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;

}

static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)

{

    TransContext *trans = inlink->dst->priv;

    return trans->passthrough ?

        ff_null_get_video_buffer   (inlink, w, h) :

        ff_default_get_video_buffer(inlink, w, h);

}

typedef struct ThreadData {

    AVFrame *in, *out;

} ThreadData;

static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr,

                        int nb_jobs)

{

    TransContext *trans = ctx->priv;

    ThreadData *td = arg;

    AVFrame *out = td->out;

    AVFrame *in = td->in;

    int plane;

    for (plane = 0; out->data[plane]; plane++) {

        int hsub    = plane == 1 || plane == 2 ? trans->hsub : 0;

        int vsub    = plane == 1 || plane == 2 ? trans->vsub : 0;

        int pixstep = trans->pixsteps[plane];

        int inh     = FF_CEIL_RSHIFT(in->height, vsub);

        int outw    = FF_CEIL_RSHIFT(out->width,  hsub);

        int outh    = FF_CEIL_RSHIFT(out->height, vsub);

        int start   = (outh *  jobnr   ) / nb_jobs;

        int end     = (outh * (jobnr+1)) / nb_jobs;

        uint8_t *dst, *src;

        int dstlinesize, srclinesize;

        int x, y;

        dstlinesize = out->linesize[plane];

        dst         = out->data[plane] + start * dstlinesize;

        src         = in->data[plane];

        srclinesize = in->linesize[plane];

        if (trans->dir & 1) {

            src         += in->linesize[plane] * (inh - 1);

            srclinesize *= -1;

        }

        if (trans->dir & 2) {

            dst          = out->data[plane] + dstlinesize * (outh - start - 1);

            dstlinesize *= -1;

        }

        switch (pixstep) {

        case 1:

            for (y = start; y < end; y++, dst += dstlinesize)

                for (x = 0; x < outw; x++)

                    dst[x] = src[x * srclinesize + y];

            break;

        case 2:

            for (y = start; y < end; y++, dst += dstlinesize) {

                for (x = 0; x < outw; x++)

                    *((uint16_t *)(dst + 2 * x)) =

                        *((uint16_t *)(src + x * srclinesize + y * 2));

            }

            break;

        case 3:

            for (y = start; y < end; y++, dst += dstlinesize) {

                for (x = 0; x < outw; x++) {

                    int32_t v = AV_RB24(src + x * srclinesize + y * 3);

                    AV_WB24(dst + 3 * x, v);

                }

            }

            break;

        case 4:

            for (y = start; y < end; y++, dst += dstlinesize) {

                for (x = 0; x < outw; x++)

                    *((uint32_t *)(dst + 4 * x)) =

                        *((uint32_t *)(src + x * srclinesize + y * 4));

            }

            break;

        case 6:

            for (y = start; y < end; y++, dst += dstlinesize) {

                for (x = 0; x < outw; x++) {

                    int64_t v = AV_RB48(src + x * srclinesize + y*6);

                    AV_WB48(dst + 6*x, v);

                }

            }

            break;

        case 8:

            for (y = start; y < end; y++, dst += dstlinesize) {

                for (x = 0; x < outw; x++)

                    *((uint64_t *)(dst + 8*x)) = *((uint64_t *)(src + x * srclinesize + y*8));

            }

            break;

        }

    }

    return 0;

}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)

{

    AVFilterContext *ctx = inlink->dst;

    TransContext *trans = ctx->priv;

    AVFilterLink *outlink = ctx->outputs[0];

    ThreadData td;

    AVFrame *out;

    if (trans->passthrough)

        return ff_filter_frame(outlink, in);

    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

    if (!out) {

        av_frame_free(&in);

        return AVERROR(ENOMEM);

    }

    av_frame_copy_props(out, in);

    if (in->sample_aspect_ratio.num == 0) {

        out->sample_aspect_ratio = in->sample_aspect_ratio;

    } else {

        out->sample_aspect_ratio.num = in->sample_aspect_ratio.den;

        out->sample_aspect_ratio.den = in->sample_aspect_ratio.num;

    }

    td.in = in, td.out = out;

    ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ctx->graph->nb_threads));

    av_frame_free(&in);

    return ff_filter_frame(outlink, out);

}

#define OFFSET(x) offsetof(TransContext, x)

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption transpose_options[] = {

    { "dir", "set transpose direction", OFFSET(dir), AV_OPT_TYPE_INT, { .i64 = TRANSPOSE_CCLOCK_FLIP }, 0, 7, FLAGS, "dir" },

        { "cclock_flip", "rotate counter-clockwise with vertical flip", 0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CCLOCK_FLIP }, .unit = "dir" },

        { "clock",       "rotate clockwise",                            0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CLOCK       }, .unit = "dir" },

        { "cclock",      "rotate counter-clockwise",                    0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CCLOCK      }, .unit = "dir" },

        { "clock_flip",  "rotate clockwise with vertical flip",         0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CLOCK_FLIP  }, .unit = "dir" },

    { "passthrough", "do not apply transposition if the input matches the specified geometry",

      OFFSET(passthrough), AV_OPT_TYPE_INT, {.i64=TRANSPOSE_PT_TYPE_NONE},  0, INT_MAX, FLAGS, "passthrough" },

        { "none",      "always apply transposition",   0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_NONE},      INT_MIN, INT_MAX, FLAGS, "passthrough" },

        { "portrait",  "preserve portrait geometry",   0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_PORTRAIT},  INT_MIN, INT_MAX, FLAGS, "passthrough" },

        { "landscape", "preserve landscape geometry",  0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_LANDSCAPE}, INT_MIN, INT_MAX, FLAGS, "passthrough" },

    { NULL }

};

AVFILTER_DEFINE_CLASS(transpose);

static const AVFilterPad avfilter_vf_transpose_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .get_video_buffer = get_video_buffer,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad avfilter_vf_transpose_outputs[] = {

    {

        .name         = "default",

        .config_props = config_props_output,

        .type         = AVMEDIA_TYPE_VIDEO,

    },

    { NULL }

};

AVFilter ff_vf_transpose = {

    .name          = "transpose",

    .description   = NULL_IF_CONFIG_SMALL("Transpose input video."),

    .priv_size     = sizeof(TransContext),

    .priv_class    = &transpose_class,

    .query_formats = query_formats,

    .inputs        = avfilter_vf_transpose_inputs,

    .outputs       = avfilter_vf_transpose_outputs,

    .flags         = AVFILTER_FLAG_SLICE_THREADS,

};