+/*

+ * 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 <SDL.h>

+#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 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;

+

+ 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, SDL_SWSURFACE);

+ 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 },

+ { 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,

+};