sdl.c 11.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/*
 * 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>
27 28
#include <SDL_thread.h>

29 30 31 32
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
33
#include "libavutil/time.h"
34 35 36 37 38 39 40 41
#include "avdevice.h"

typedef struct {
    AVClass *class;
    SDL_Surface *surface;
    SDL_Overlay *overlay;
    char *window_title;
    char *icon_title;
Nicolas George's avatar
Nicolas George committed
42
    int window_width,  window_height;  /**< size of the window */
43
    int window_fullscreen;
44 45

    SDL_Rect overlay_rect;
46
    int overlay_fmt;
47

48
    int sdl_was_already_inited;
49 50 51 52 53 54
    SDL_Thread *event_thread;
    SDL_mutex *mutex;
    SDL_cond *init_cond;
    int init_ret; /* return code used to signal initialization errors */
    int inited;
    int quit;
55 56
} SDLContext;

57
static const struct sdl_overlay_pix_fmt_entry {
58
    enum AVPixelFormat pix_fmt; int overlay_fmt;
59
} sdl_overlay_pix_fmt_map[] = {
60 61 62 63
    { 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                },
64 65 66 67 68 69
};

static int sdl_write_trailer(AVFormatContext *s)
{
    SDLContext *sdl = s->priv_data;

70 71 72
    sdl->quit = 1;

    if (sdl->overlay)
73
        SDL_FreeYUVOverlay(sdl->overlay);
74 75 76 77 78 79 80
    if (sdl->event_thread)
        SDL_WaitThread(sdl->event_thread, NULL);
    if (sdl->mutex)
        SDL_DestroyMutex(sdl->mutex);
    if (sdl->init_cond)
        SDL_DestroyCond(sdl->init_cond);

81 82 83 84 85 86
    if (!sdl->sdl_was_already_inited)
        SDL_Quit();

    return 0;
}

87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
static void compute_overlay_rect(AVFormatContext *s)
{
    AVRational sar, dar; /* sample and display aspect ratios */
    SDLContext *sdl = s->priv_data;
    AVStream *st = s->streams[0];
    AVCodecContext *encctx = st->codec;
    SDL_Rect *overlay_rect = &sdl->overlay_rect;

    /* 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 */
            overlay_rect->w = sdl->window_width;
            overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num);
        } else {
            /* fit in height */
            overlay_rect->h = sdl->window_height;
            overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den);
        }
    } else {
        if (sar.num > sar.den) {
            overlay_rect->w = encctx->width;
            overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num);
        } else {
            overlay_rect->h = encctx->height;
            overlay_rect->w = av_rescale(overlay_rect->h, dar.num, dar.den);
        }
        sdl->window_width  = overlay_rect->w;
        sdl->window_height = overlay_rect->h;
    }

    overlay_rect->x = (sdl->window_width  - overlay_rect->w) / 2;
    overlay_rect->y = (sdl->window_height - overlay_rect->h) / 2;
}

127 128
#define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_RESIZABLE)

129 130 131 132
static int event_thread(void *arg)
{
    AVFormatContext *s = arg;
    SDLContext *sdl = s->priv_data;
133
    int flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_FULLSCREEN : 0);
134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
    AVStream *st = s->streams[0];
    AVCodecContext *encctx = st->codec;

    /* initialization */
    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
        av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
        sdl->init_ret = AVERROR(EINVAL);
        goto init_end;
    }

    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(sdl, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
        sdl->init_ret = AVERROR(EINVAL);
        goto init_end;
    }

    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);
        sdl->init_ret = AVERROR(EINVAL);
        goto init_end;
    }

    sdl->init_ret = 0;
    av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n",
           encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt),
166
           sdl->overlay_rect.w, sdl->overlay_rect.h);
167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182

init_end:
    SDL_LockMutex(sdl->mutex);
    sdl->inited = 1;
    SDL_UnlockMutex(sdl->mutex);
    SDL_CondSignal(sdl->init_cond);

    if (sdl->init_ret < 0)
        return sdl->init_ret;

    /* event loop */
    while (!sdl->quit) {
        int ret;
        SDL_Event event;
        SDL_PumpEvents();
        ret = SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_ALLEVENTS);
183
        if (ret < 0) {
184 185
            av_log(s, AV_LOG_ERROR, "Error when getting SDL event: %s\n", SDL_GetError());
            continue;
186 187 188 189 190
        }
        if (ret == 0) {
            SDL_Delay(10);
            continue;
        }
191 192 193 194 195 196 197 198 199 200 201 202 203

        switch (event.type) {
        case SDL_KEYDOWN:
            switch (event.key.keysym.sym) {
            case SDLK_ESCAPE:
            case SDLK_q:
                sdl->quit = 1;
                break;
            }
            break;
        case SDL_QUIT:
            sdl->quit = 1;
            break;
204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219

        case SDL_VIDEORESIZE:
            sdl->window_width  = event.resize.w;
            sdl->window_height = event.resize.h;

            SDL_LockMutex(sdl->mutex);
            sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height, 24, SDL_BASE_FLAGS);
            if (!sdl->surface) {
                av_log(s, AV_LOG_ERROR, "Failed to set SDL video mode: %s\n", SDL_GetError());
                sdl->quit = 1;
            } else {
                compute_overlay_rect(s);
            }
            SDL_UnlockMutex(sdl->mutex);
            break;

220 221 222 223 224 225 226 227
        default:
            break;
        }
    }

    return 0;
}

228 229 230 231 232 233 234
static int sdl_write_header(AVFormatContext *s)
{
    SDLContext *sdl = s->priv_data;
    AVStream *st = s->streams[0];
    AVCodecContext *encctx = st->codec;
    int i, ret;

235 236
    if (!sdl->window_title)
        sdl->window_title = av_strdup(s->filename);
237 238 239 240 241
    if (!sdl->icon_title)
        sdl->icon_title = av_strdup(sdl->window_title);

    if (SDL_WasInit(SDL_INIT_VIDEO)) {
        av_log(s, AV_LOG_ERROR,
242
               "SDL video subsystem was already inited, aborting\n");
243 244 245 246 247 248 249
        sdl->sdl_was_already_inited = 1;
        ret = AVERROR(EINVAL);
        goto fail;
    }

    if (   s->nb_streams > 1
        || encctx->codec_type != AVMEDIA_TYPE_VIDEO
250
        || encctx->codec_id   != AV_CODEC_ID_RAWVIDEO) {
251 252 253 254 255
        av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
        ret = AVERROR(EINVAL);
        goto fail;
    }

256
    for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != AV_PIX_FMT_NONE; i++) {
257 258 259 260 261 262 263 264
        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,
265
               "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n",
266 267 268 269 270 271
               av_get_pix_fmt_name(encctx->pix_fmt));
        ret = AVERROR(EINVAL);
        goto fail;
    }

    /* compute overlay width and height from the codec context information */
272
    compute_overlay_rect(s);
273

274 275 276 277
    sdl->init_cond = SDL_CreateCond();
    if (!sdl->init_cond) {
        av_log(s, AV_LOG_ERROR, "Could not create SDL condition variable: %s\n", SDL_GetError());
        ret = AVERROR_EXTERNAL;
278 279
        goto fail;
    }
280 281 282 283 284 285 286 287 288 289
    sdl->mutex = SDL_CreateMutex();
    if (!sdl->mutex) {
        av_log(s, AV_LOG_ERROR, "Could not create SDL mutex: %s\n", SDL_GetError());
        ret = AVERROR_EXTERNAL;
        goto fail;
    }
    sdl->event_thread = SDL_CreateThread(event_thread, s);
    if (!sdl->event_thread) {
        av_log(s, AV_LOG_ERROR, "Could not create SDL event thread: %s\n", SDL_GetError());
        ret = AVERROR_EXTERNAL;
290 291 292
        goto fail;
    }

293 294 295 296 297 298 299 300 301 302
    /* wait until the video system has been inited */
    SDL_LockMutex(sdl->mutex);
    if (!sdl->inited) {
        SDL_CondWait(sdl->init_cond, sdl->mutex);
    }
    SDL_UnlockMutex(sdl->mutex);
    if (sdl->init_ret < 0) {
        ret = sdl->init_ret;
        goto fail;
    }
303 304 305 306 307 308 309 310 311 312 313 314 315 316
    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;
    AVPicture pict;
    int i;

317 318
    if (sdl->quit) {
        sdl_write_trailer(s);
319
        return AVERROR(EIO);
320
    }
321 322
    avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);

323
    SDL_LockMutex(sdl->mutex);
324 325 326 327 328 329 330
    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];
    }
331
    SDL_DisplayYUVOverlay(sdl->overlay, &sdl->overlay_rect);
332 333
    SDL_UnlockYUVOverlay(sdl->overlay);

334 335 336
    SDL_UpdateRect(sdl->surface,
                   sdl->overlay_rect.x, sdl->overlay_rect.y,
                   sdl->overlay_rect.w, sdl->overlay_rect.h);
337
    SDL_UnlockMutex(sdl->mutex);
338 339 340 341 342 343 344

    return 0;
}

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

static const AVOption options[] = {
345 346 347 348
    { "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 },
349 350 351 352 353 354 355 356 357 358 359 360 361 362
    { 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),
363 364
    .audio_codec    = AV_CODEC_ID_NONE,
    .video_codec    = AV_CODEC_ID_RAWVIDEO,
365 366 367
    .write_header   = sdl_write_header,
    .write_packet   = sdl_write_packet,
    .write_trailer  = sdl_write_trailer,
368
    .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
369 370
    .priv_class     = &sdl_class,
};