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/*

 * Copyright (c) 2013 Jeff Moguillansky

 *

 * 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

 * XVideo output device

 *

 * TODO:

 * - add support to more formats

 * - add support to window id specification

 */

#include 

#include 

#include 

#include 

#include 

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "avdevice.h"

typedef struct {

    AVClass *class;

    GC gc;

    Window window;

    char *window_title;

    int window_width, window_height;

    int window_x, window_y;

    Display* display;

    char *display_name;

    XvImage* yuv_image;

    int image_width, image_height;

    XShmSegmentInfo yuv_shminfo;

    int xv_port;

} XVContext;

static int xv_write_header(AVFormatContext *s)

{

    XVContext *xv = s->priv_data;

    unsigned int num_adaptors;

    XvAdaptorInfo *ai;

    XvImageFormatValues *fv;

    int num_formats = 0, j;

    AVCodecContext *encctx = s->streams[0]->codec;

    if (   s->nb_streams > 1

        || encctx->codec_type != AVMEDIA_TYPE_VIDEO

        || encctx->codec_id   != AV_CODEC_ID_RAWVIDEO) {

        av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");

        return AVERROR(EINVAL);

    }

    xv->display = XOpenDisplay(xv->display_name);

    if (!xv->display) {

        av_log(s, AV_LOG_ERROR, "Could not open the X11 display '%s'\n", xv->display_name);

        return AVERROR(EINVAL);

    }

    xv->image_width  = encctx->width;

    xv->image_height = encctx->height;

    if (!xv->window_width && !xv->window_height) {

        xv->window_width  = encctx->width;

        xv->window_height = encctx->height;

    }

    xv->window = XCreateSimpleWindow(xv->display, DefaultRootWindow(xv->display),

                                     xv->window_x, xv->window_y,

                                     xv->window_width, xv->window_height,

                                     0, 0, 0);

    if (!xv->window_title) {

        if (!(xv->window_title = av_strdup(s->filename)))

            return AVERROR(ENOMEM);

    }

    XStoreName(xv->display, xv->window, xv->window_title);

    XMapWindow(xv->display, xv->window);

    if (XvQueryAdaptors(xv->display, DefaultRootWindow(xv->display), &num_adaptors, &ai) != Success)

        return AVERROR_EXTERNAL;

    xv->xv_port = ai[0].base_id;

    if (encctx->pix_fmt != AV_PIX_FMT_YUV420P) {

        av_log(s, AV_LOG_ERROR,

               "Unsupported pixel format '%s', only yuv420p is currently supported\n",

               av_get_pix_fmt_name(encctx->pix_fmt));

        return AVERROR_PATCHWELCOME;

    }

    fv = XvListImageFormats(xv->display, xv->xv_port, &num_formats);

    if (!fv)

        return AVERROR_EXTERNAL;

    for (j = 0; j < num_formats; j++) {

        if (fv[j].id == MKTAG('I','4','2','0')) {

            break;

        }

    }

    XFree(fv);

    if (j >= num_formats) {

        av_log(s, AV_LOG_ERROR,

               "Device does not support pixel format yuv420p, aborting\n");

        return AVERROR(EINVAL);

    }

    xv->gc = XCreateGC(xv->display, xv->window, 0, 0);

    xv->image_width  = encctx->width;

    xv->image_height = encctx->height;

    xv->yuv_image = XvShmCreateImage(xv->display, xv->xv_port,

                                     MKTAG('I','4','2','0'), 0,

                                     xv->image_width, xv->image_height, &xv->yuv_shminfo);

    xv->yuv_shminfo.shmid = shmget(IPC_PRIVATE, xv->yuv_image->data_size,

                                   IPC_CREAT | 0777);

    xv->yuv_shminfo.shmaddr = (char *)shmat(xv->yuv_shminfo.shmid, 0, 0);

    xv->yuv_image->data = xv->yuv_shminfo.shmaddr;

    xv->yuv_shminfo.readOnly = False;

    XShmAttach(xv->display, &xv->yuv_shminfo);

    XSync(xv->display, False);

    shmctl(xv->yuv_shminfo.shmid, IPC_RMID, 0);

    return 0;

}

static int xv_write_packet(AVFormatContext *s, AVPacket *pkt)

{

    XVContext *xv = s->priv_data;

    XvImage *img = xv->yuv_image;

    XWindowAttributes window_attrs;

    AVPicture pict;

    AVCodecContext *ctx = s->streams[0]->codec;

    int y, h;

    h = img->height / 2;

    avpicture_fill(&pict, pkt->data, ctx->pix_fmt, ctx->width, ctx->height);

    for (y = 0; y < img->height; y++) {

        memcpy(&img->data[img->offsets[0] + (y * img->pitches[0])],

               &pict.data[0][y * pict.linesize[0]], img->pitches[0]);

    }

    for (y = 0; y < h; ++y) {

        memcpy(&img->data[img->offsets[1] + (y * img->pitches[1])],

               &pict.data[1][y * pict.linesize[1]], img->pitches[1]);

        memcpy(&img->data[img->offsets[2] + (y * img->pitches[2])],

               &pict.data[2][y * pict.linesize[2]], img->pitches[2]);

    }

    XGetWindowAttributes(xv->display, xv->window, &window_attrs);

    if (XvShmPutImage(xv->display, xv->xv_port, xv->window, xv->gc,

                      xv->yuv_image, 0, 0, xv->image_width, xv->image_height, 0, 0,

                      window_attrs.width, window_attrs.height, True) != Success) {

        av_log(s, AV_LOG_ERROR, "Could not copy image to XV shared memory buffer\n");

        return AVERROR_EXTERNAL;

    }

    return 0;

}

static int xv_write_trailer(AVFormatContext *s)

{

    XVContext *xv = s->priv_data;

    XShmDetach(xv->display, &xv->yuv_shminfo);

    shmdt(xv->yuv_image->data);

    XFree(xv->yuv_image);

    XCloseDisplay(xv->display);

    return 0;

}

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

static const AVOption options[] = {

    { "display_name", "set display name",       OFFSET(display_name), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },

    { "window_size",  "set window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },

    { "window_title", "set window title",       OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },

    { "window_x",     "set window x offset",    OFFSET(window_x),     AV_OPT_TYPE_INT,    {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

    { "window_y",     "set window y offset",    OFFSET(window_y),     AV_OPT_TYPE_INT,    {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

    { NULL }

};

static const AVClass xv_class = {

    .class_name = "xvideo outdev",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVOutputFormat ff_xv_muxer = {

    .name           = "xv",

    .long_name      = NULL_IF_CONFIG_SMALL("XV (XVideo) output device"),

    .priv_data_size = sizeof(XVContext),

    .audio_codec    = AV_CODEC_ID_NONE,

    .video_codec    = AV_CODEC_ID_RAWVIDEO,

    .write_header   = xv_write_header,

    .write_packet   = xv_write_packet,

    .write_trailer  = xv_write_trailer,

    .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,

    .priv_class     = &xv_class,

};