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 const AVClass av_codec_context_class = {
69 .class_name = "AVCodecContext",
70 .item_name = context_to_name,
72 .version = LIBAVUTIL_VERSION_INT,
73 .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
74 .child_next = codec_child_next,
75 .child_class_next = codec_child_class_next,
78 #if FF_API_ALLOC_CONTEXT
79 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType codec_type){
82 avcodec_get_context_defaults3(s, &c);
86 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec){
88 memset(s, 0, sizeof(AVCodecContext));
90 s->av_class = &av_codec_context_class;
92 s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
93 if(s->codec_type == AVMEDIA_TYPE_AUDIO)
94 flags= AV_OPT_FLAG_AUDIO_PARAM;
95 else if(s->codec_type == AVMEDIA_TYPE_VIDEO)
96 flags= AV_OPT_FLAG_VIDEO_PARAM;
97 else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)
98 flags= AV_OPT_FLAG_SUBTITLE_PARAM;
99 av_opt_set_defaults2(s, flags, flags);
101 s->time_base = (AVRational){0,1};
102 s->get_buffer = avcodec_default_get_buffer;
103 s->release_buffer = avcodec_default_release_buffer;
104 s->get_format = avcodec_default_get_format;
105 s->execute = avcodec_default_execute;
106 s->execute2 = avcodec_default_execute2;
107 s->sample_aspect_ratio = (AVRational){0,1};
108 s->pix_fmt = PIX_FMT_NONE;
109 s->sample_fmt = AV_SAMPLE_FMT_NONE;
110 s->timecode_frame_start = -1;
112 s->reget_buffer = avcodec_default_reget_buffer;
113 s->reordered_opaque = AV_NOPTS_VALUE;
114 if(codec && codec->priv_data_size){
116 s->priv_data= av_mallocz(codec->priv_data_size);
118 return AVERROR(ENOMEM);
121 if(codec->priv_class){
122 *(const AVClass**)s->priv_data = codec->priv_class;
123 av_opt_set_defaults(s->priv_data);
126 if (codec && codec->defaults) {
128 const AVCodecDefault *d = codec->defaults;
130 ret = av_opt_set(s, d->key, d->value, 0);
131 av_assert0(ret >= 0);
138 AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
139 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
141 if(avctx==NULL) return NULL;
143 if(avcodec_get_context_defaults3(avctx, codec) < 0){
151 #if FF_API_ALLOC_CONTEXT
152 AVCodecContext *avcodec_alloc_context2(enum AVMediaType codec_type){
153 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
155 if(avctx==NULL) return NULL;
157 avcodec_get_context_defaults2(avctx, codec_type);
162 void avcodec_get_context_defaults(AVCodecContext *s){
163 avcodec_get_context_defaults2(s, AVMEDIA_TYPE_UNKNOWN);
166 AVCodecContext *avcodec_alloc_context(void){
167 return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);
171 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
173 if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
174 av_log(dest, AV_LOG_ERROR,
175 "Tried to copy AVCodecContext %p into already-initialized %p\n",
177 return AVERROR(EINVAL);
179 memcpy(dest, src, sizeof(*dest));
181 /* set values specific to opened codecs back to their default state */
182 dest->priv_data = NULL;
184 dest->slice_offset = NULL;
185 dest->hwaccel = NULL;
186 dest->thread_opaque = NULL;
187 dest->internal = NULL;
189 /* reallocate values that should be allocated separately */
191 dest->extradata = NULL;
192 dest->intra_matrix = NULL;
193 dest->inter_matrix = NULL;
194 dest->rc_override = NULL;
196 dest->rc_eq = av_strdup(src->rc_eq);
198 return AVERROR(ENOMEM);
201 #define alloc_and_copy_or_fail(obj, size, pad) \
202 if (src->obj && size > 0) { \
203 dest->obj = av_malloc(size + pad); \
206 memcpy(dest->obj, src->obj, size); \
208 memset(((uint8_t *) dest->obj) + size, 0, pad); \
210 alloc_and_copy_or_fail(extradata, src->extradata_size,
211 FF_INPUT_BUFFER_PADDING_SIZE);
212 alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
213 alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
214 alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
215 #undef alloc_and_copy_or_fail
220 av_freep(&dest->rc_override);
221 av_freep(&dest->intra_matrix);
222 av_freep(&dest->inter_matrix);
223 av_freep(&dest->extradata);
224 av_freep(&dest->rc_eq);
225 return AVERROR(ENOMEM);
228 const AVClass *avcodec_get_class(void)
230 return &av_codec_context_class;
233 #define FOFFSET(x) offsetof(AVFrame,x)
235 static const AVOption frame_options[]={
236 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.dbl = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
237 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.dbl = -1 }, INT64_MIN, INT64_MAX, 0},
238 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
239 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
240 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
241 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.dbl = -1 }, 0, INT_MAX, 0},
242 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.dbl = 0 }, 0, INT64_MAX, 0},
243 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
247 static const AVClass av_frame_class = {
248 .class_name = "AVFrame",
250 .option = frame_options,
251 .version = LIBAVUTIL_VERSION_INT,
254 const AVClass *avcodec_get_frame_class(void)
256 return &av_frame_class;
259 #define SROFFSET(x) offsetof(AVSubtitleRect,x)
261 static const AVOption subtitle_rect_options[]={
262 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
263 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
264 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
265 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
266 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, 0},
267 {"forced", "", SROFFSET(forced), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, 0},
271 static const AVClass av_subtitle_rect_class = {
272 .class_name = "AVSubtitleRect",
274 .option = subtitle_rect_options,
275 .version = LIBAVUTIL_VERSION_INT,
278 const AVClass *avcodec_get_subtitle_rect_class(void)
280 return &av_subtitle_rect_class;