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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 <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 PixelFormat pix_fmt; int overlay_fmt;
} sdl_overlay_pix_fmt_map[] = {
{ PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
{ PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
{ PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
{ 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 != 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,
};
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