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/*

 * Copyright (c) 2011 Stefano Sabatini

 *

 * 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

 * libSDL output device

 */

#include 

#include "libavutil/avstring.h"

#include "libavutil/opt.h"

#include "libavutil/parseutils.h"

#include "libavutil/pixdesc.h"

#include "avdevice.h"

typedef struct {

    AVClass *class;

    SDL_Surface *surface;

    SDL_Overlay *overlay;

    char *window_title;

    char *icon_title;

    int window_width,  window_height;  /**< size of the window */

    int window_fullscreen;

    int overlay_width, overlay_height; /**< size of the video in the window */

    int overlay_x, overlay_y;

    int overlay_fmt;

    int sdl_was_already_inited;

} SDLContext;

static const struct sdl_overlay_pix_fmt_entry {

    enum AVPixelFormat pix_fmt; int overlay_fmt;

} sdl_overlay_pix_fmt_map[] = {

    { AV_PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },

    { AV_PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },

    { AV_PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },

    { AV_PIX_FMT_NONE,    0                },

};

static int sdl_write_trailer(AVFormatContext *s)

{

    SDLContext *sdl = s->priv_data;

    av_freep(&sdl->window_title);

    av_freep(&sdl->icon_title);

    if (sdl->overlay) {

        SDL_FreeYUVOverlay(sdl->overlay);

        sdl->overlay = NULL;

    }

    if (!sdl->sdl_was_already_inited)

        SDL_Quit();

    return 0;

}

static int sdl_write_header(AVFormatContext *s)

{

    SDLContext *sdl = s->priv_data;

    AVStream *st = s->streams[0];

    AVCodecContext *encctx = st->codec;

    AVRational sar, dar; /* sample and display aspect ratios */

    int i, ret;

    int flags = SDL_SWSURFACE | sdl->window_fullscreen ? SDL_FULLSCREEN : 0;

    if (!sdl->window_title)

        sdl->window_title = av_strdup(s->filename);

    if (!sdl->icon_title)

        sdl->icon_title = av_strdup(sdl->window_title);

    if (SDL_WasInit(SDL_INIT_VIDEO)) {

        av_log(s, AV_LOG_ERROR,

               "SDL video subsystem was already inited, aborting\n");

        sdl->sdl_was_already_inited = 1;

        ret = AVERROR(EINVAL);

        goto fail;

    }

    if (SDL_Init(SDL_INIT_VIDEO) != 0) {

        av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());

        ret = AVERROR(EINVAL);

        goto fail;

    }

    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");

        ret = AVERROR(EINVAL);

        goto fail;

    }

    for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != AV_PIX_FMT_NONE; i++) {

        if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {

            sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;

            break;

        }

    }

    if (!sdl->overlay_fmt) {

        av_log(s, AV_LOG_ERROR,

               "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n",

               av_get_pix_fmt_name(encctx->pix_fmt));

        ret = AVERROR(EINVAL);

        goto fail;

    }

    /* compute overlay width and height from the codec context information */

    sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };

    dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });

    /* we suppose the screen has a 1/1 sample aspect ratio */

    if (sdl->window_width && sdl->window_height) {

        /* fit in the window */

        if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {

            /* fit in width */

            sdl->overlay_width  = sdl->window_width;

            sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);

        } else {

            /* fit in height */

            sdl->overlay_height = sdl->window_height;

            sdl->overlay_width  = av_rescale(sdl->overlay_height, dar.num, dar.den);

        }

    } else {

        if (sar.num > sar.den) {

            sdl->overlay_width  = encctx->width;

            sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);

        } else {

            sdl->overlay_height = encctx->height;

            sdl->overlay_width  = av_rescale(sdl->overlay_height, dar.num, dar.den);

        }

        sdl->window_width  = sdl->overlay_width;

        sdl->window_height = sdl->overlay_height;

    }

    sdl->overlay_x = (sdl->window_width  - sdl->overlay_width ) / 2;

    sdl->overlay_y = (sdl->window_height - sdl->overlay_height) / 2;

    SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);

    sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,

                                    24, flags);

    if (!sdl->surface) {

        av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());

        ret = AVERROR(EINVAL);

        goto fail;

    }

    sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height,

                                        sdl->overlay_fmt, sdl->surface);

    if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) {

        av_log(s, AV_LOG_ERROR,

               "SDL does not support an overlay with size of %dx%d pixels\n",

               encctx->width, encctx->height);

        ret = AVERROR(EINVAL);

        goto fail;

    }

    av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d\n",

           encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar.num, sar.den,

           sdl->overlay_width, sdl->overlay_height);

    return 0;

fail:

    sdl_write_trailer(s);

    return ret;

}

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

{

    SDLContext *sdl = s->priv_data;

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

    SDL_Rect rect = { sdl->overlay_x, sdl->overlay_y, sdl->overlay_width, sdl->overlay_height };

    AVPicture pict;

    int i;

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

    SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,

                 SDL_MapRGB(sdl->surface->format, 0, 0, 0));

    SDL_LockYUVOverlay(sdl->overlay);

    for (i = 0; i < 3; i++) {

        sdl->overlay->pixels [i] = pict.data    [i];

        sdl->overlay->pitches[i] = pict.linesize[i];

    }

    SDL_DisplayYUVOverlay(sdl->overlay, &rect);

    SDL_UnlockYUVOverlay(sdl->overlay);

    SDL_UpdateRect(sdl->surface, rect.x, rect.y, rect.w, rect.h);

    return 0;

}

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

static const AVOption options[] = {

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

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

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

    { "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_INT,{.i64=0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

    { NULL },

};

static const AVClass sdl_class = {

    .class_name = "sdl outdev",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVOutputFormat ff_sdl_muxer = {

    .name           = "sdl",

    .long_name      = NULL_IF_CONFIG_SMALL("SDL output device"),

    .priv_data_size = sizeof(SDLContext),

    .audio_codec    = AV_CODEC_ID_NONE,

    .video_codec    = AV_CODEC_ID_RAWVIDEO,

    .write_header   = sdl_write_header,

    .write_packet   = sdl_write_packet,

    .write_trailer  = sdl_write_trailer,

    .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,

    .priv_class     = &sdl_class,

};