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/internal.h"

31 #include "libavutil/mem.h"

32 #include "libavutil/opt.h"

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

34 #include <string.h>

36 #include "options_table.h"

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

39 AVCodecContext *avc= ptr;

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

42 return avc->codec->name;

43 else

44 return "NULL";

45 }

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

48 {

49 AVCodecContext *s = obj;

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

51 return s->priv_data;

52 return NULL;

53 }

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

56 {

57 AVCodec *c = NULL;

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

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

61 if (c->priv_class == prev)

62 break;

64 /* find next codec with priv options */

65 while (c = av_codec_next(c))

66 if (c->priv_class)

67 return c->priv_class;

68 return NULL;

69 }

71 static AVClassCategory get_category(void *ptr)

72 {

73 AVCodecContext* avctx = ptr;

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

75 else return AV_CLASS_CATEGORY_ENCODER;

76 }

78 static const AVClass av_codec_context_class = {

79 .class_name = "AVCodecContext",

80 .item_name = context_to_name,

81 .option = avcodec_options,

82 .version = LIBAVUTIL_VERSION_INT,

83 .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),

84 .child_next = codec_child_next,

85 .child_class_next = codec_child_class_next,

86 .category = AV_CLASS_CATEGORY_ENCODER,

87 .get_category = get_category,

88 };

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

91 {

92 int flags=0;

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

95 s->av_class = &av_codec_context_class;

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

98 if (codec) {

99 s->codec = codec;

100 s->codec_id = codec->id;

101 }

102

103 if(s->codec_type == AVMEDIA_TYPE_AUDIO)

104 flags= AV_OPT_FLAG_AUDIO_PARAM;

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

106 flags= AV_OPT_FLAG_VIDEO_PARAM;

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

108 flags= AV_OPT_FLAG_SUBTITLE_PARAM;

109 av_opt_set_defaults2(s, flags, flags);

110

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

112 s->framerate = (AVRational){ 0, 1 };

113 s->pkt_timebase = (AVRational){ 0, 1 };

114 s->get_buffer2 = avcodec_default_get_buffer2;

115 s->get_format = avcodec_default_get_format;

116 s->execute = avcodec_default_execute;

117 s->execute2 = avcodec_default_execute2;

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

119 s->pix_fmt = AV_PIX_FMT_NONE;

120 s->sample_fmt = AV_SAMPLE_FMT_NONE;

121

122 s->reordered_opaque = AV_NOPTS_VALUE;

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

124 if(!s->priv_data){

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

126 if (!s->priv_data) {

127 return AVERROR(ENOMEM);

128 }

129 }

130 if(codec->priv_class){

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

132 av_opt_set_defaults(s->priv_data);

133 }

134 }

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

136 int ret;

137 const AVCodecDefault *d = codec->defaults;

138 while (d->key) {

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

140 av_assert0(ret >= 0);

141 d++;

142 }

143 }

144 return 0;

145 }

146

147 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)

148 {

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

150

151 if (!avctx)

152 return NULL;

153

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

155 av_free(avctx);

156 return NULL;

157 }

158

159 return avctx;

160 }

161

162 void avcodec_free_context(AVCodecContext **pavctx)

163 {

164 AVCodecContext *avctx = *pavctx;

165

166 if (!avctx)

167 return;

168

169 avcodec_close(avctx);

170

171 av_freep(&avctx->extradata);

172 av_freep(&avctx->subtitle_header);

173 av_freep(&avctx->intra_matrix);

174 av_freep(&avctx->inter_matrix);

175 av_freep(&avctx->rc_override);

176

177 av_freep(pavctx);

178 }

179

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

181 {

182 const AVCodec *orig_codec = dest->codec;

183 uint8_t *orig_priv_data = dest->priv_data;

184

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

186 av_log(dest, AV_LOG_ERROR,

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

188 src, dest);

189 return AVERROR(EINVAL);

190 }

191

192 av_opt_free(dest);

193 av_freep(&dest->rc_override);

194 av_freep(&dest->intra_matrix);

195 av_freep(&dest->inter_matrix);

196 av_freep(&dest->extradata);

197 av_freep(&dest->subtitle_header);

198

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

200 av_opt_copy(dest, src);

201

202 dest->priv_data = orig_priv_data;

203 dest->codec = orig_codec;

204

205 if (orig_priv_data && src->codec && src->codec->priv_class &&

206 dest->codec && dest->codec->priv_class)

207 av_opt_copy(orig_priv_data, src->priv_data);

208

209

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

211 dest->slice_offset = NULL;

212 dest->hwaccel = NULL;

213 dest->internal = NULL;

214 dest->coded_frame = NULL;

215

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

217 dest->extradata = NULL;

218 dest->intra_matrix = NULL;

219 dest->inter_matrix = NULL;

220 dest->rc_override = NULL;

221 dest->subtitle_header = NULL;

222

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

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

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

226 if (!dest->obj) \

227 goto fail; \

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

229 if (pad) \

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

231 }

232 alloc_and_copy_or_fail(extradata, src->extradata_size,

233 FF_INPUT_BUFFER_PADDING_SIZE);

234 dest->extradata_size = src->extradata_size;

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

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

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

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

239 av_assert0(dest->subtitle_header_size == src->subtitle_header_size);

240 #undef alloc_and_copy_or_fail

241

242 return 0;

243

244 fail:

245 av_freep(&dest->rc_override);

246 av_freep(&dest->intra_matrix);

247 av_freep(&dest->inter_matrix);

248 av_freep(&dest->extradata);

249 av_freep(&dest->subtitle_header);

250 dest->subtitle_header_size = 0;

251 dest->extradata_size = 0;

252 av_opt_free(dest);

253 return AVERROR(ENOMEM);

254 }

255

256 const AVClass *avcodec_get_class(void)

257 {

258 return &av_codec_context_class;

259 }

260

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

262

263 static const AVOption frame_options[]={

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

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

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

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

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

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

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

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

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

273 {NULL},

274 };

275

276 static const AVClass av_frame_class = {

277 .class_name = "AVFrame",

278 .item_name = NULL,

279 .option = frame_options,

280 .version = LIBAVUTIL_VERSION_INT,

281 };

282

283 const AVClass *avcodec_get_frame_class(void)

284 {

285 return &av_frame_class;

286 }

287

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

289

290 static const AVOption subtitle_rect_options[]={

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

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

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

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

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

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

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

298 {NULL},

299 };

300

301 static const AVClass av_subtitle_rect_class = {

302 .class_name = "AVSubtitleRect",

303 .item_name = NULL,

304 .option = subtitle_rect_options,

305 .version = LIBAVUTIL_VERSION_INT,

306 };

307

308 const AVClass *avcodec_get_subtitle_rect_class(void)

309 {

310 return &av_subtitle_rect_class;

311 }

312

313 #ifdef TEST

314 static int dummy_init(AVCodecContext *ctx)

315 {

316 //TODO: this code should set every possible pointer that could be set by codec and is not an option;

317 ctx->extradata_size = 8;

318 ctx->extradata = av_malloc(ctx->extradata_size);

319 ctx->coded_frame = av_frame_alloc();

320 return 0;

321 }

322

323 static int dummy_close(AVCodecContext *ctx)

324 {

325 av_freep(&ctx->extradata);

326 ctx->extradata_size = 0;

327 av_frame_free(&ctx->coded_frame);

328 return 0;

329 }

330

331 static int dummy_encode(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)

332 {

333 return AVERROR(ENOSYS);

334 }

335

336 typedef struct Dummy12Context {

337 AVClass *av_class;

338 int num;

339 char* str;

340 } Dummy12Context;

341

342 typedef struct Dummy3Context {

343 void *fake_av_class;

344 int num;

345 char* str;

346 } Dummy3Context;

347

348 #define OFFSET(x) offsetof(Dummy12Context, x)

349 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

350 static const AVOption dummy_options[] = {

351 { "str", "set str", OFFSET(str), AV_OPT_TYPE_STRING, { .str = "i'm src default value" }, 0, 0, VE},

352 { "num", "set num", OFFSET(num), AV_OPT_TYPE_INT, { .i64 = 1500100900 }, 0, INT_MAX, VE},

353 { NULL },

354 };

355

356 static const AVClass dummy_v1_class = {

357 .class_name = "dummy_v1_class",

358 .item_name = av_default_item_name,

359 .option = dummy_options,

360 .version = LIBAVUTIL_VERSION_INT,

361 };

362

363 static const AVClass dummy_v2_class = {

364 .class_name = "dummy_v2_class",

365 .item_name = av_default_item_name,

366 .option = dummy_options,

367 .version = LIBAVUTIL_VERSION_INT,

368 };

369

370 /* codec with options */

371 AVCodec dummy_v1_encoder = {

372 .name = "dummy_v1_codec",

373 .type = AVMEDIA_TYPE_VIDEO,

374 .id = AV_CODEC_ID_NONE - 1,

375 .encode2 = dummy_encode,

376 .init = dummy_init,

377 .close = dummy_close,

378 .priv_class = &dummy_v1_class,

379 .priv_data_size = sizeof(Dummy12Context),

380 };

381

382 /* codec with options, different class */

383 AVCodec dummy_v2_encoder = {

384 .name = "dummy_v2_codec",

385 .type = AVMEDIA_TYPE_VIDEO,

386 .id = AV_CODEC_ID_NONE - 2,

387 .encode2 = dummy_encode,

388 .init = dummy_init,

389 .close = dummy_close,

390 .priv_class = &dummy_v2_class,

391 .priv_data_size = sizeof(Dummy12Context),

392 };

393

394 /* codec with priv data, but no class */

395 AVCodec dummy_v3_encoder = {

396 .name = "dummy_v3_codec",

397 .type = AVMEDIA_TYPE_VIDEO,

398 .id = AV_CODEC_ID_NONE - 3,

399 .encode2 = dummy_encode,

400 .init = dummy_init,

401 .close = dummy_close,

402 .priv_data_size = sizeof(Dummy3Context),

403 };

404

405 /* codec without priv data */

406 AVCodec dummy_v4_encoder = {

407 .name = "dummy_v4_codec",

408 .type = AVMEDIA_TYPE_VIDEO,

409 .id = AV_CODEC_ID_NONE - 4,

410 .encode2 = dummy_encode,

411 .init = dummy_init,

412 .close = dummy_close,

413 };

414

415 static void test_copy_print_codec(const AVCodecContext *ctx)

416 {

417 printf("%-14s: %dx%d prv: %s",

418 ctx->codec ? ctx->codec->name : "NULL",

419 ctx->width, ctx->height,

420 ctx->priv_data ? "set" : "null");

421 if (ctx->codec && ctx->codec->priv_class && ctx->codec->priv_data_size) {

422 int64_t i64;

423 char *str = NULL;

424 av_opt_get_int(ctx->priv_data, "num", 0, &i64);

425 av_opt_get(ctx->priv_data, "str", 0, (uint8_t**)&str);

426 printf(" opts: %"PRId64" %s", i64, str);

427 av_free(str);

428 }

429 printf("\n");

430 }

431

432 static void test_copy(const AVCodec *c1, const AVCodec *c2)

433 {

434 AVCodecContext *ctx1, *ctx2;

435 printf("%s -> %s\nclosed:\n", c1 ? c1->name : "NULL", c2 ? c2->name : "NULL");

436 ctx1 = avcodec_alloc_context3(c1);

437 ctx2 = avcodec_alloc_context3(c2);

438 ctx1->width = ctx1->height = 128;

439 if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {

440 av_opt_set(ctx2->priv_data, "num", "667", 0);

441 av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);

442 }

443 avcodec_copy_context(ctx2, ctx1);

444 test_copy_print_codec(ctx1);

445 test_copy_print_codec(ctx2);

446 if (ctx1->codec) {

447 printf("opened:\n");

448 avcodec_open2(ctx1, ctx1->codec, NULL);

449 if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {

450 av_opt_set(ctx2->priv_data, "num", "667", 0);

451 av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);

452 }

453 avcodec_copy_context(ctx2, ctx1);

454 test_copy_print_codec(ctx1);

455 test_copy_print_codec(ctx2);

456 avcodec_close(ctx1);

457 }

458 avcodec_free_context(&ctx1);

459 avcodec_free_context(&ctx2);

460 }

461

462 int main(void)

463 {

464 AVCodec *dummy_codec[] = {

465 &dummy_v1_encoder,

466 &dummy_v2_encoder,

467 &dummy_v3_encoder,

468 &dummy_v4_encoder,

469 NULL,

470 };

471 int i, j;

472

473 for (i = 0; dummy_codec[i]; i++)

474 avcodec_register(dummy_codec[i]);

475

476 printf("testing avcodec_copy_context()\n");

477 for (i = 0; i < FF_ARRAY_ELEMS(dummy_codec); i++)

478 for (j = 0; j < FF_ARRAY_ELEMS(dummy_codec); j++)

479 test_copy(dummy_codec[i], dummy_codec[j]);

480 return 0;

481 }

482 #endif

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