FFmpeg: libavcodec/options.c Source File

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libavcodec

options.c

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1 /*

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 /**

23 * @file

24 * Options definition for AVCodecContext.

25 */

27 #include "avcodec.h"

28 #include "internal.h"

29 #include "libavutil/avassert.h"

30 #include "libavutil/mem.h"

31 #include "libavutil/opt.h"

32 #include <float.h> /* FLT_MIN, FLT_MAX */

33 #include <string.h>

35 #include "options_table.h"

37 static const char* context_to_name(void* ptr) {

38 AVCodecContext *avc= ptr;

40 if(avc && avc->codec && avc->codec->name)

41 return avc->codec->name;

42 else

43 return "NULL";

44 }

46 static void *codec_child_next(void *obj, void *prev)

47 {

48 AVCodecContext *s = obj;

49 if (!prev && s->codec && s->codec->priv_class && s->priv_data)

50 return s->priv_data;

51 return NULL;

52 }

54 static const AVClass *codec_child_class_next(const AVClass *prev)

55 {

56 AVCodec *c = NULL;

58 /* find the codec that corresponds to prev */

59 while (prev && (c = av_codec_next(c)))

60 if (c->priv_class == prev)

61 break;

63 /* find next codec with priv options */

64 while (c = av_codec_next(c))

65 if (c->priv_class)

66 return c->priv_class;

67 return NULL;

68 }

70 static AVClassCategory get_category(void *ptr)

71 {

72 AVCodecContext* avctx = ptr;

73 if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;

74 else return AV_CLASS_CATEGORY_ENCODER;

75 }

77 static const AVClass av_codec_context_class = {

78 .class_name = "AVCodecContext",

79 .item_name = context_to_name,

80 .option = options,

81 .version = LIBAVUTIL_VERSION_INT,

82 .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),

83 .child_next = codec_child_next,

84 .child_class_next = codec_child_class_next,

85 .category = AV_CLASS_CATEGORY_ENCODER,

86 .get_category = get_category,

87 };

89 #if FF_API_ALLOC_CONTEXT

90 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType codec_type){

91 AVCodec c= {0};

92 c.type= codec_type;

93 avcodec_get_context_defaults3(s, &c);

94 }

95 #endif

97 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)

98 {

99 int flags=0;

100 memset(s, 0, sizeof(AVCodecContext));

101

102 s->av_class = &av_codec_context_class;

103

104 s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;

105 if (codec)

106 s->codec_id = codec->id;

107

108 if(s->codec_type == AVMEDIA_TYPE_AUDIO)

109 flags= AV_OPT_FLAG_AUDIO_PARAM;

110 else if(s->codec_type == AVMEDIA_TYPE_VIDEO)

111 flags= AV_OPT_FLAG_VIDEO_PARAM;

112 else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)

113 flags= AV_OPT_FLAG_SUBTITLE_PARAM;

114 av_opt_set_defaults2(s, flags, flags);

115

116 s->time_base = (AVRational){0,1};

117 s->get_buffer2 = avcodec_default_get_buffer2;

118 s->get_format = avcodec_default_get_format;

119 s->execute = avcodec_default_execute;

120 s->execute2 = avcodec_default_execute2;

121 s->sample_aspect_ratio = (AVRational){0,1};

122 s->pix_fmt = AV_PIX_FMT_NONE;

123 s->sample_fmt = AV_SAMPLE_FMT_NONE;

124 s->timecode_frame_start = -1;

125

126 s->reordered_opaque = AV_NOPTS_VALUE;

127 if(codec && codec->priv_data_size){

128 if(!s->priv_data){

129 s->priv_data= av_mallocz(codec->priv_data_size);

130 if (!s->priv_data) {

131 return AVERROR(ENOMEM);

132 }

133 }

134 if(codec->priv_class){

135 *(const AVClass**)s->priv_data = codec->priv_class;

136 av_opt_set_defaults(s->priv_data);

137 }

138 }

139 if (codec && codec->defaults) {

140 int ret;

141 const AVCodecDefault *d = codec->defaults;

142 while (d->key) {

143 ret = av_opt_set(s, d->key, d->value, 0);

144 av_assert0(ret >= 0);

145 d++;

146 }

147 }

148 return 0;

149 }

150

151 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)

152 {

153 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));

154

155 if(avctx==NULL) return NULL;

156

157 if(avcodec_get_context_defaults3(avctx, codec) < 0){

158 av_free(avctx);

159 return NULL;

160 }

161

162 return avctx;

163 }

164

165 #if FF_API_ALLOC_CONTEXT

166 AVCodecContext *avcodec_alloc_context2(enum AVMediaType codec_type){

167 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));

168

169 if(avctx==NULL) return NULL;

170

171 avcodec_get_context_defaults2(avctx, codec_type);

172

173 return avctx;

174 }

175

176 void avcodec_get_context_defaults(AVCodecContext *s){

177 avcodec_get_context_defaults2(s, AVMEDIA_TYPE_UNKNOWN);

178 }

179

180 AVCodecContext *avcodec_alloc_context(void){

181 return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);

182 }

183 #endif

184

185 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)

186 {

187 if (avcodec_is_open(dest)) { // check that the dest context is uninitialized

188 av_log(dest, AV_LOG_ERROR,

189 "Tried to copy AVCodecContext %p into already-initialized %p\n",

190 src, dest);

191 return AVERROR(EINVAL);

192 }

193 memcpy(dest, src, sizeof(*dest));

194

195 /* set values specific to opened codecs back to their default state */

196 dest->priv_data = NULL;

197 dest->codec = NULL;

198 dest->slice_offset = NULL;

199 dest->hwaccel = NULL;

200 dest->thread_opaque = NULL;

201 dest->internal = NULL;

202

203 /* reallocate values that should be allocated separately */

204 dest->rc_eq = NULL;

205 dest->extradata = NULL;

206 dest->intra_matrix = NULL;

207 dest->inter_matrix = NULL;

208 dest->rc_override = NULL;

209 if (src->rc_eq) {

210 dest->rc_eq = av_strdup(src->rc_eq);

211 if (!dest->rc_eq)

212 return AVERROR(ENOMEM);

213 }

214

215 #define alloc_and_copy_or_fail(obj, size, pad) \

216 if (src->obj && size > 0) { \

217 dest->obj = av_malloc(size + pad); \

218 if (!dest->obj) \

219 goto fail; \

220 memcpy(dest->obj, src->obj, size); \

221 if (pad) \

222 memset(((uint8_t *) dest->obj) + size, 0, pad); \

223 }

224 alloc_and_copy_or_fail(extradata, src->extradata_size,

225 FF_INPUT_BUFFER_PADDING_SIZE);

226 alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);

227 alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);

228 alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);

229 alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);

230 #undef alloc_and_copy_or_fail

231

232 return 0;

233

234 fail:

235 av_freep(&dest->rc_override);

236 av_freep(&dest->intra_matrix);

237 av_freep(&dest->inter_matrix);

238 av_freep(&dest->extradata);

239 av_freep(&dest->rc_eq);

240 return AVERROR(ENOMEM);

241 }

242

243 const AVClass *avcodec_get_class(void)

244 {

245 return &av_codec_context_class;

246 }

247

248 #define FOFFSET(x) offsetof(AVFrame,x)

249

250 static const AVOption frame_options[]={

251 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},

252 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},

253 {"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},

254 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},

255 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

256 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

257 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},

258 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},

259 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

260 {NULL},

261 };

262

263 static const AVClass av_frame_class = {

264 .class_name = "AVFrame",

265 .item_name = NULL,

266 .option = frame_options,

267 .version = LIBAVUTIL_VERSION_INT,

268 };

269

270 const AVClass *avcodec_get_frame_class(void)

271 {

272 return &av_frame_class;

273 }

274

275 #define SROFFSET(x) offsetof(AVSubtitleRect,x)

276

277 static const AVOption subtitle_rect_options[]={

278 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

279 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

280 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

281 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

282 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

283 {"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},

284 {"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},

285 {NULL},

286 };

287

288 static const AVClass av_subtitle_rect_class = {

289 .class_name = "AVSubtitleRect",

290 .item_name = NULL,

291 .option = subtitle_rect_options,

292 .version = LIBAVUTIL_VERSION_INT,

293 };

294

295 const AVClass *avcodec_get_subtitle_rect_class(void)

296 {

297 return &av_subtitle_rect_class;

298 }

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