2 * Copyright (c) 2001 Fabrice Bellard
3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Options definition for AVCodecContext.
29 #include "libavutil/avassert.h"
30 #include "libavutil/opt.h"
31 #include <float.h> /* FLT_MIN, FLT_MAX */
33 #include "options_table.h"
35 static const char* context_to_name(void* ptr) {
36 AVCodecContext *avc= ptr;
38 if(avc && avc->codec && avc->codec->name)
39 return avc->codec->name;
44 static void *codec_child_next(void *obj, void *prev)
46 AVCodecContext *s = obj;
47 if (!prev && s->codec && s->codec->priv_class && s->priv_data)
52 static const AVClass *codec_child_class_next(const AVClass *prev)
56 /* find the codec that corresponds to prev */
57 while (prev && (c = av_codec_next(c)))
58 if (c->priv_class == prev)
61 /* find next codec with priv options */
62 while (c = av_codec_next(c))
68 static AVClassCategory get_category(void *ptr)
70 AVCodecContext* avctx = ptr;
71 if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
72 else return AV_CLASS_CATEGORY_ENCODER;
75 static const AVClass av_codec_context_class = {
76 .class_name = "AVCodecContext",
77 .item_name = context_to_name,
79 .version = LIBAVUTIL_VERSION_INT,
80 .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
81 .child_next = codec_child_next,
82 .child_class_next = codec_child_class_next,
83 .category = AV_CLASS_CATEGORY_ENCODER,
84 .get_category = get_category,
87 #if FF_API_ALLOC_CONTEXT
88 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType codec_type){
91 avcodec_get_context_defaults3(s, &c);
95 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec){
97 memset(s, 0, sizeof(AVCodecContext));
99 s->av_class = &av_codec_context_class;
101 s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
102 if(s->codec_type == AVMEDIA_TYPE_AUDIO)
103 flags= AV_OPT_FLAG_AUDIO_PARAM;
104 else if(s->codec_type == AVMEDIA_TYPE_VIDEO)
105 flags= AV_OPT_FLAG_VIDEO_PARAM;
106 else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)
107 flags= AV_OPT_FLAG_SUBTITLE_PARAM;
108 av_opt_set_defaults2(s, flags, flags);
110 s->time_base = (AVRational){0,1};
111 s->get_buffer = avcodec_default_get_buffer;
112 s->release_buffer = avcodec_default_release_buffer;
113 s->get_format = avcodec_default_get_format;
114 s->execute = avcodec_default_execute;
115 s->execute2 = avcodec_default_execute2;
116 s->sample_aspect_ratio = (AVRational){0,1};
117 s->pix_fmt = PIX_FMT_NONE;
118 s->sample_fmt = AV_SAMPLE_FMT_NONE;
119 s->timecode_frame_start = -1;
121 s->reget_buffer = avcodec_default_reget_buffer;
122 s->reordered_opaque = AV_NOPTS_VALUE;
123 if(codec && codec->priv_data_size){
125 s->priv_data= av_mallocz(codec->priv_data_size);
127 return AVERROR(ENOMEM);
130 if(codec->priv_class){
131 *(const AVClass**)s->priv_data = codec->priv_class;
132 av_opt_set_defaults(s->priv_data);
135 if (codec && codec->defaults) {
137 const AVCodecDefault *d = codec->defaults;
139 ret = av_opt_set(s, d->key, d->value, 0);
140 av_assert0(ret >= 0);
147 AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
148 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
150 if(avctx==NULL) return NULL;
152 if(avcodec_get_context_defaults3(avctx, codec) < 0){
160 #if FF_API_ALLOC_CONTEXT
161 AVCodecContext *avcodec_alloc_context2(enum AVMediaType codec_type){
162 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
164 if(avctx==NULL) return NULL;
166 avcodec_get_context_defaults2(avctx, codec_type);
171 void avcodec_get_context_defaults(AVCodecContext *s){
172 avcodec_get_context_defaults2(s, AVMEDIA_TYPE_UNKNOWN);
175 AVCodecContext *avcodec_alloc_context(void){
176 return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);
180 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
182 if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
183 av_log(dest, AV_LOG_ERROR,
184 "Tried to copy AVCodecContext %p into already-initialized %p\n",
186 return AVERROR(EINVAL);
188 memcpy(dest, src, sizeof(*dest));
190 /* set values specific to opened codecs back to their default state */
191 dest->priv_data = NULL;
193 dest->slice_offset = NULL;
194 dest->hwaccel = NULL;
195 dest->thread_opaque = NULL;
196 dest->internal = NULL;
198 /* reallocate values that should be allocated separately */
200 dest->extradata = NULL;
201 dest->intra_matrix = NULL;
202 dest->inter_matrix = NULL;
203 dest->rc_override = NULL;
205 dest->rc_eq = av_strdup(src->rc_eq);
207 return AVERROR(ENOMEM);
210 #define alloc_and_copy_or_fail(obj, size, pad) \
211 if (src->obj && size > 0) { \
212 dest->obj = av_malloc(size + pad); \
215 memcpy(dest->obj, src->obj, size); \
217 memset(((uint8_t *) dest->obj) + size, 0, pad); \
219 alloc_and_copy_or_fail(extradata, src->extradata_size,
220 FF_INPUT_BUFFER_PADDING_SIZE);
221 alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
222 alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
223 alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
224 #undef alloc_and_copy_or_fail
229 av_freep(&dest->rc_override);
230 av_freep(&dest->intra_matrix);
231 av_freep(&dest->inter_matrix);
232 av_freep(&dest->extradata);
233 av_freep(&dest->rc_eq);
234 return AVERROR(ENOMEM);
237 const AVClass *avcodec_get_class(void)
239 return &av_codec_context_class;
242 #define FOFFSET(x) offsetof(AVFrame,x)
244 static const AVOption frame_options[]={
245 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.dbl = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
246 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.dbl = -1 }, INT64_MIN, INT64_MAX, 0},
247 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
248 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
249 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
250 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.dbl = -1 }, 0, INT_MAX, 0},
251 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.dbl = 0 }, 0, INT64_MAX, 0},
252 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
256 static const AVClass av_frame_class = {
257 .class_name = "AVFrame",
259 .option = frame_options,
260 .version = LIBAVUTIL_VERSION_INT,
263 const AVClass *avcodec_get_frame_class(void)
265 return &av_frame_class;
268 #define SROFFSET(x) offsetof(AVSubtitleRect,x)
270 static const AVOption subtitle_rect_options[]={
271 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
272 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
273 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
274 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
275 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
276 {"forced", "", SROFFSET(forced), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, 0},
280 static const AVClass av_subtitle_rect_class = {
281 .class_name = "AVSubtitleRect",
283 .option = subtitle_rect_options,
284 .version = LIBAVUTIL_VERSION_INT,
287 const AVClass *avcodec_get_subtitle_rect_class(void)
289 return &av_subtitle_rect_class;