sdl.c 7.5 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230
  1. /*
  2. * Copyright (c) 2011 Stefano Sabatini
  3. *
  4. * This file is part of FFmpeg.
  5. *
  6. * FFmpeg is free software; you can redistribute it and/or
  7. * modify it under the terms of the GNU Lesser General Public
  8. * License as published by the Free Software Foundation; either
  9. * version 2.1 of the License, or (at your option) any later version.
  10. *
  11. * FFmpeg is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14. * Lesser General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU Lesser General Public
  17. * License along with FFmpeg; if not, write to the Free Software
  18. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19. */
  20. /**
  21. * @file
  22. * libSDL output device
  23. */
  24. #include <SDL.h>
  25. #include "libavutil/avstring.h"
  26. #include "libavutil/opt.h"
  27. #include "libavutil/parseutils.h"
  28. #include "libavutil/pixdesc.h"
  29. #include "avdevice.h"
  30. typedef struct {
  31. AVClass *class;
  32. SDL_Surface *surface;
  33. SDL_Overlay *overlay;
  34. char *window_title;
  35. char *icon_title;
  36. char *window_size;
  37. int window_width, window_height;
  38. int overlay_width, overlay_height;
  39. int overlay_fmt;
  40. int sdl_was_already_inited;
  41. } SDLContext;
  42. struct sdl_overlay_pix_fmt_entry {
  43. enum PixelFormat pix_fmt; int overlay_fmt;
  44. } sdl_overlay_pix_fmt_map[] = {
  45. { PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
  46. { PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
  47. { PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
  48. { PIX_FMT_NONE, 0 },
  49. };
  50. static int sdl_write_trailer(AVFormatContext *s)
  51. {
  52. SDLContext *sdl = s->priv_data;
  53. av_freep(&sdl->window_title);
  54. av_freep(&sdl->icon_title);
  55. av_freep(&sdl->window_size);
  56. if (sdl->overlay) {
  57. SDL_FreeYUVOverlay(sdl->overlay);
  58. sdl->overlay = NULL;
  59. }
  60. if (!sdl->sdl_was_already_inited)
  61. SDL_Quit();
  62. return 0;
  63. }
  64. static int sdl_write_header(AVFormatContext *s)
  65. {
  66. SDLContext *sdl = s->priv_data;
  67. AVStream *st = s->streams[0];
  68. AVCodecContext *encctx = st->codec;
  69. float sar, dar; /* sample and display aspect ratios */
  70. int i, ret;
  71. if (!sdl->window_title)
  72. sdl->window_title = av_strdup(s->filename);
  73. if (!sdl->icon_title)
  74. sdl->icon_title = av_strdup(sdl->window_title);
  75. if (SDL_WasInit(SDL_INIT_VIDEO)) {
  76. av_log(s, AV_LOG_ERROR,
  77. "SDL video subsystem was already inited, aborting.\n");
  78. sdl->sdl_was_already_inited = 1;
  79. ret = AVERROR(EINVAL);
  80. goto fail;
  81. }
  82. if (SDL_Init(SDL_INIT_VIDEO) != 0) {
  83. av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
  84. ret = AVERROR(EINVAL);
  85. goto fail;
  86. }
  87. if ( s->nb_streams > 1
  88. || encctx->codec_type != AVMEDIA_TYPE_VIDEO
  89. || encctx->codec_id != CODEC_ID_RAWVIDEO) {
  90. av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
  91. ret = AVERROR(EINVAL);
  92. goto fail;
  93. }
  94. for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != PIX_FMT_NONE; i++) {
  95. if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
  96. sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
  97. break;
  98. }
  99. }
  100. if (!sdl->overlay_fmt) {
  101. av_log(s, AV_LOG_ERROR,
  102. "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422.\n",
  103. av_get_pix_fmt_name(encctx->pix_fmt));
  104. ret = AVERROR(EINVAL);
  105. goto fail;
  106. }
  107. if (sdl->window_size) {
  108. if (av_parse_video_size(&sdl->window_width, &sdl->window_height,
  109. sdl->window_size) < 0) {
  110. av_log(s, AV_LOG_ERROR, "Invalid window size '%s'\n", sdl->window_size);
  111. ret = AVERROR(EINVAL);
  112. goto fail;
  113. }
  114. }
  115. /* compute overlay width and height from the codec context information */
  116. sar = st->sample_aspect_ratio.num ? av_q2d(st->sample_aspect_ratio) : 1;
  117. dar = sar * (float)encctx->width / (float)encctx->height;
  118. /* we suppose the screen has a 1/1 sample aspect ratio */
  119. sdl->overlay_height = encctx->height;
  120. sdl->overlay_width = ((int)rint(sdl->overlay_height * dar));
  121. if (sdl->overlay_width > encctx->width) {
  122. sdl->overlay_width = encctx->width;
  123. sdl->overlay_height = ((int)rint(sdl->overlay_width / dar));
  124. }
  125. if (!sdl->window_width || !sdl->window_height) {
  126. sdl->window_width = sdl->overlay_width;
  127. sdl->window_height = sdl->overlay_height;
  128. }
  129. SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
  130. sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
  131. 24, SDL_SWSURFACE);
  132. if (!sdl->surface) {
  133. av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
  134. ret = AVERROR(EINVAL);
  135. goto fail;
  136. }
  137. sdl->overlay = SDL_CreateYUVOverlay(sdl->overlay_width, sdl->overlay_height,
  138. sdl->overlay_fmt, sdl->surface);
  139. if (!sdl->overlay || sdl->overlay->pitches[0] < sdl->overlay_width) {
  140. av_log(s, AV_LOG_ERROR,
  141. "SDL does not support an overlay with size of %dx%d pixels.\n",
  142. sdl->overlay_width, sdl->overlay_height);
  143. ret = AVERROR(EINVAL);
  144. goto fail;
  145. }
  146. av_log(s, AV_LOG_INFO, "w:%d h:%d fmt:%s sar:%f -> w:%d h:%d\n",
  147. encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar,
  148. sdl->window_width, sdl->window_height);
  149. return 0;
  150. fail:
  151. sdl_write_trailer(s);
  152. return ret;
  153. }
  154. static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
  155. {
  156. SDLContext *sdl = s->priv_data;
  157. AVCodecContext *encctx = s->streams[0]->codec;
  158. SDL_Rect rect = { 0, 0, sdl->window_width, sdl->window_height };
  159. AVPicture pict;
  160. int i;
  161. avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
  162. SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
  163. SDL_MapRGB(sdl->surface->format, 0, 0, 0));
  164. SDL_LockYUVOverlay(sdl->overlay);
  165. for (i = 0; i < 3; i++) {
  166. sdl->overlay->pixels [i] = pict.data [i];
  167. sdl->overlay->pitches[i] = pict.linesize[i];
  168. }
  169. SDL_DisplayYUVOverlay(sdl->overlay, &rect);
  170. SDL_UnlockYUVOverlay(sdl->overlay);
  171. SDL_UpdateRect(sdl->surface, 0, 0, sdl->overlay_width, sdl->overlay_height);
  172. return 0;
  173. }
  174. #define OFFSET(x) offsetof(SDLContext,x)
  175. static const AVOption options[] = {
  176. { "window_title", "SDL window title", OFFSET(window_title), FF_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
  177. { "icon_title", "SDL iconified window title", OFFSET(icon_title) , FF_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
  178. { "window_size", "SDL window forced size", OFFSET(window_size) , FF_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
  179. { NULL },
  180. };
  181. static const AVClass sdl_class = {
  182. .class_name = "sdl outdev",
  183. .item_name = av_default_item_name,
  184. .option = options,
  185. .version = LIBAVUTIL_VERSION_INT,
  186. };
  187. AVOutputFormat ff_sdl_muxer = {
  188. .name = "sdl",
  189. .long_name = NULL_IF_CONFIG_SMALL("SDL output device"),
  190. .priv_data_size = sizeof(SDLContext),
  191. .audio_codec = CODEC_ID_NONE,
  192. .video_codec = CODEC_ID_RAWVIDEO,
  193. .write_header = sdl_write_header,
  194. .write_packet = sdl_write_packet,
  195. .write_trailer = sdl_write_trailer,
  196. .flags = AVFMT_NOFILE,
  197. .priv_class = &sdl_class,
  198. };