FFmpeg: libavfilter/vf_tile.c Source File

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libavfilter

vf_tile.c

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1 /*

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 */

21 /**

22 * @file

23 * tile video filter

24 */

26 #include "libavutil/opt.h"

27 #include "libavutil/pixdesc.h"

28 #include "avfilter.h"

29 #include "drawutils.h"

30 #include "formats.h"

31 #include "video.h"

32 #include "internal.h"

34 typedef struct {

35 const AVClass *class;

36 unsigned w, h;

37 unsigned margin;

38 unsigned padding;

39 unsigned current;

40 unsigned nb_frames;

41 FFDrawContext draw;

42 FFDrawColor blank;

43 AVFrame *out_ref;

44 uint8_t rgba_color[4];

45 } TileContext;

47 #define REASONABLE_SIZE 1024

49 #define OFFSET(x) offsetof(TileContext, x)

50 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

52 static const AVOption tile_options[] = {

53 { "layout", "set grid size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE,

54 {.str = "6x5"}, 0, 0, FLAGS },

55 { "nb_frames", "set maximum number of frame to render", OFFSET(nb_frames),

56 AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },

57 { "margin", "set outer border margin in pixels", OFFSET(margin),

58 AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },

59 { "padding", "set inner border thickness in pixels", OFFSET(padding),

60 AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },

61 { "color", "set the color of the unused area", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },

62 { NULL }

63 };

65 AVFILTER_DEFINE_CLASS(tile);

67 static av_cold int init(AVFilterContext *ctx)

68 {

69 TileContext *tile = ctx->priv;

71 if (tile->w > REASONABLE_SIZE || tile->h > REASONABLE_SIZE) {

72 av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",

73 tile->w, tile->h);

74 return AVERROR(EINVAL);

75 }

77 if (tile->nb_frames == 0) {

78 tile->nb_frames = tile->w * tile->h;

79 } else if (tile->nb_frames > tile->w * tile->h) {

80 av_log(ctx, AV_LOG_ERROR, "nb_frames must be less than or equal to %dx%d=%d\n",

81 tile->w, tile->h, tile->w * tile->h);

82 return AVERROR(EINVAL);

83 }

85 return 0;

86 }

88 static int query_formats(AVFilterContext *ctx)

89 {

90 ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));

91 return 0;

92 }

94 static int config_props(AVFilterLink *outlink)

95 {

96 AVFilterContext *ctx = outlink->src;

97 TileContext *tile = ctx->priv;

98 AVFilterLink *inlink = ctx->inputs[0];

99 const unsigned total_margin_w = (tile->w - 1) * tile->padding + 2*tile->margin;

100 const unsigned total_margin_h = (tile->h - 1) * tile->padding + 2*tile->margin;

101

102 if (inlink->w > (INT_MAX - total_margin_w) / tile->w) {

103 av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",

104 tile->w, inlink->w);

105 return AVERROR(EINVAL);

106 }

107 if (inlink->h > (INT_MAX - total_margin_h) / tile->h) {

108 av_log(ctx, AV_LOG_ERROR, "Total height %ux%u is too much.\n",

109 tile->h, inlink->h);

110 return AVERROR(EINVAL);

111 }

112 outlink->w = tile->w * inlink->w + total_margin_w;

113 outlink->h = tile->h * inlink->h + total_margin_h;

114 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

115 outlink->frame_rate = av_mul_q(inlink->frame_rate,

116 (AVRational){ 1, tile->nb_frames });

117 ff_draw_init(&tile->draw, inlink->format, 0);

118 ff_draw_color(&tile->draw, &tile->blank, tile->rgba_color);

119

120 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

121

122 return 0;

123 }

124

125 static void get_current_tile_pos(AVFilterContext *ctx, unsigned *x, unsigned *y)

126 {

127 TileContext *tile = ctx->priv;

128 AVFilterLink *inlink = ctx->inputs[0];

129 const unsigned tx = tile->current % tile->w;

130 const unsigned ty = tile->current / tile->w;

131

132 *x = tile->margin + (inlink->w + tile->padding) * tx;

133 *y = tile->margin + (inlink->h + tile->padding) * ty;

134 }

135

136 static void draw_blank_frame(AVFilterContext *ctx, AVFrame *out_buf)

137 {

138 TileContext *tile = ctx->priv;

139 AVFilterLink *inlink = ctx->inputs[0];

140 unsigned x0, y0;

141

142 get_current_tile_pos(ctx, &x0, &y0);

143 ff_fill_rectangle(&tile->draw, &tile->blank,

144 out_buf->data, out_buf->linesize,

145 x0, y0, inlink->w, inlink->h);

146 tile->current++;

147 }

148 static int end_last_frame(AVFilterContext *ctx)

149 {

150 TileContext *tile = ctx->priv;

151 AVFilterLink *outlink = ctx->outputs[0];

152 AVFrame *out_buf = tile->out_ref;

153 int ret;

154

155 while (tile->current < tile->nb_frames)

156 draw_blank_frame(ctx, out_buf);

157 ret = ff_filter_frame(outlink, out_buf);

158 tile->current = 0;

159 return ret;

160 }

161

162 /* Note: direct rendering is not possible since there is no guarantee that

163 * buffers are fed to filter_frame in the order they were obtained from

164 * get_buffer (think B-frames). */

165

166 static int filter_frame(AVFilterLink *inlink, AVFrame *picref)

167 {

168 AVFilterContext *ctx = inlink->dst;

169 TileContext *tile = ctx->priv;

170 AVFilterLink *outlink = ctx->outputs[0];

171 unsigned x0, y0;

172

173 if (!tile->current) {

174 tile->out_ref = ff_get_video_buffer(outlink, outlink->w, outlink->h);

175 if (!tile->out_ref) {

176 av_frame_free(&picref);

177 return AVERROR(ENOMEM);

178 }

179 av_frame_copy_props(tile->out_ref, picref);

180 tile->out_ref->width = outlink->w;

181 tile->out_ref->height = outlink->h;

182

183 /* fill surface once for margin/padding */

184 if (tile->margin || tile->padding)

185 ff_fill_rectangle(&tile->draw, &tile->blank,

186 tile->out_ref->data,

187 tile->out_ref->linesize,

188 0, 0, outlink->w, outlink->h);

189 }

190

191 get_current_tile_pos(ctx, &x0, &y0);

192 ff_copy_rectangle2(&tile->draw,

193 tile->out_ref->data, tile->out_ref->linesize,

194 picref->data, picref->linesize,

195 x0, y0, 0, 0, inlink->w, inlink->h);

196

197 av_frame_free(&picref);

198 if (++tile->current == tile->nb_frames)

199 return end_last_frame(ctx);

200

201 return 0;

202 }

203

204 static int request_frame(AVFilterLink *outlink)

205 {

206 AVFilterContext *ctx = outlink->src;

207 TileContext *tile = ctx->priv;

208 AVFilterLink *inlink = ctx->inputs[0];

209 int r;

210

211 r = ff_request_frame(inlink);

212 if (r == AVERROR_EOF && tile->current)

213 r = end_last_frame(ctx);

214 return r;

215 }

216

217 static const AVFilterPad tile_inputs[] = {

218 {

219 .name = "default",

220 .type = AVMEDIA_TYPE_VIDEO,

221 .filter_frame = filter_frame,

222 },

223 { NULL }

224 };

225

226 static const AVFilterPad tile_outputs[] = {

227 {

228 .name = "default",

229 .type = AVMEDIA_TYPE_VIDEO,

230 .config_props = config_props,

231 .request_frame = request_frame,

232 },

233 { NULL }

234 };

235

236 AVFilter avfilter_vf_tile = {

237 .name = "tile",

238 .description = NULL_IF_CONFIG_SMALL("Tile several successive frames together."),

239 .init = init,

240 .query_formats = query_formats,

241 .priv_size = sizeof(TileContext),

242 .inputs = tile_inputs,

243 .outputs = tile_outputs,

244 .priv_class = &tile_class,

245 };

Generated on Sat Jan 25 2014 19:52:01 for FFmpeg by doxygen 1.8.2