diff options
Diffstat (limited to 'libavdevice/sdl.c')
| -rw-r--r-- | libavdevice/sdl.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/libavdevice/sdl.c b/libavdevice/sdl.c new file mode 100644 index 0000000000..432275004c --- /dev/null +++ b/libavdevice/sdl.c @@ -0,0 +1,377 @@ +/* + * 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 <SDL_thread.h> + +#include "libavutil/avstring.h" +#include "libavutil/imgutils.h" +#include "libavutil/opt.h" +#include "libavutil/parseutils.h" +#include "libavutil/pixdesc.h" +#include "libavutil/time.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; + + SDL_Rect overlay_rect; + int overlay_fmt; + + int sdl_was_already_inited; + 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; +} 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; + + sdl->quit = 1; + + if (sdl->overlay) + SDL_FreeYUVOverlay(sdl->overlay); + sdl->overlay = NULL; + if (sdl->event_thread) + SDL_WaitThread(sdl->event_thread, NULL); + sdl->event_thread = NULL; + if (sdl->mutex) + SDL_DestroyMutex(sdl->mutex); + sdl->mutex = NULL; + if (sdl->init_cond) + SDL_DestroyCond(sdl->init_cond); + sdl->init_cond = NULL; + + if (!sdl->sdl_was_already_inited) + SDL_Quit(); + + return 0; +} + +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]; + AVCodecParameters *par = st->codecpar; + 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){ par->width, par->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 = par->width; + overlay_rect->h = av_rescale(overlay_rect->w, dar.den, dar.num); + } else { + overlay_rect->h = par->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; +} + +#define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_RESIZABLE) + +static int event_thread(void *arg) +{ + AVFormatContext *s = arg; + SDLContext *sdl = s->priv_data; + int flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_FULLSCREEN : 0); + AVStream *st = s->streams[0]; + AVCodecParameters *par = st->codecpar; + + /* 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(par->width, par->height, + sdl->overlay_fmt, sdl->surface); + if (!sdl->overlay || sdl->overlay->pitches[0] < par->width) { + av_log(s, AV_LOG_ERROR, + "SDL does not support an overlay with size of %dx%d pixels\n", + par->width, par->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", + par->width, par->height, av_get_pix_fmt_name(par->format), + sdl->overlay_rect.w, sdl->overlay_rect.h); + +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); + if (ret < 0) { + av_log(s, AV_LOG_ERROR, "Error when getting SDL event: %s\n", SDL_GetError()); + continue; + } + if (ret == 0) { + SDL_Delay(10); + continue; + } + + 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; + + 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; + + default: + break; + } + } + + return 0; +} + +static int sdl_write_header(AVFormatContext *s) +{ + SDLContext *sdl = s->priv_data; + AVStream *st = s->streams[0]; + AVCodecParameters *par = st->codecpar; + 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 ( s->nb_streams > 1 + || par->codec_type != AVMEDIA_TYPE_VIDEO + || par->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 == par->format) { + 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(par->format)); + ret = AVERROR(EINVAL); + goto fail; + } + + /* compute overlay width and height from the codec context information */ + compute_overlay_rect(s); + + 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; + goto fail; + } + 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; + goto fail; + } + + /* wait until the video system has been inited */ + SDL_LockMutex(sdl->mutex); + while (!sdl->inited) { + SDL_CondWait(sdl->init_cond, sdl->mutex); + } + SDL_UnlockMutex(sdl->mutex); + if (sdl->init_ret < 0) { + ret = sdl->init_ret; + goto fail; + } + return 0; + +fail: + sdl_write_trailer(s); + return ret; +} + +static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + SDLContext *sdl = s->priv_data; + AVCodecParameters *par = s->streams[0]->codecpar; + uint8_t *data[4]; + int linesize[4]; + int i; + + if (sdl->quit) { + sdl_write_trailer(s); + return AVERROR(EIO); + } + av_image_fill_arrays(data, linesize, pkt->data, par->format, par->width, par->height, 1); + + SDL_LockMutex(sdl->mutex); + 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] = data [i]; + sdl->overlay->pitches[i] = linesize[i]; + } + SDL_DisplayYUVOverlay(sdl->overlay, &sdl->overlay_rect); + SDL_UnlockYUVOverlay(sdl->overlay); + + SDL_UpdateRect(sdl->surface, + sdl->overlay_rect.x, sdl->overlay_rect.y, + sdl->overlay_rect.w, sdl->overlay_rect.h); + SDL_UnlockMutex(sdl->mutex); + + 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, + .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, +}; + +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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