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/mem.h"
31 #include "libavutil/opt.h"
32 #include <float.h> /* FLT_MIN, FLT_MAX */
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;
46 static void *codec_child_next(void *obj, void *prev)
48 AVCodecContext *s = obj;
49 if (!prev && s->codec && s->codec->priv_class && s->priv_data)
54 static const AVClass *codec_child_class_next(const AVClass *prev)
58 /* find the codec that corresponds to prev */
59 while (prev && (c = av_codec_next(c)))
60 if (c->priv_class == prev)
63 /* find next codec with priv options */
64 while (c = av_codec_next(c))
70 static AVClassCategory get_category(void *ptr)
72 AVCodecContext* avctx = ptr;
73 if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
74 else return AV_CLASS_CATEGORY_ENCODER;
77 static const AVClass av_codec_context_class = {
78 .class_name = "AVCodecContext",
79 .item_name = context_to_name,
80 .option = avcodec_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,
89 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
92 memset(s, 0, sizeof(AVCodecContext));
94 s->av_class = &av_codec_context_class;
96 s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
98 s->codec_id = codec->id;
100 if(s->codec_type == AVMEDIA_TYPE_AUDIO)
101 flags= AV_OPT_FLAG_AUDIO_PARAM;
102 else if(s->codec_type == AVMEDIA_TYPE_VIDEO)
103 flags= AV_OPT_FLAG_VIDEO_PARAM;
104 else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)
105 flags= AV_OPT_FLAG_SUBTITLE_PARAM;
106 av_opt_set_defaults2(s, flags, flags);
108 s->time_base = (AVRational){0,1};
109 s->get_buffer2 = avcodec_default_get_buffer2;
110 s->get_format = avcodec_default_get_format;
111 s->execute = avcodec_default_execute;
112 s->execute2 = avcodec_default_execute2;
113 s->sample_aspect_ratio = (AVRational){0,1};
114 s->pix_fmt = AV_PIX_FMT_NONE;
115 s->sample_fmt = AV_SAMPLE_FMT_NONE;
116 s->timecode_frame_start = -1;
118 s->reordered_opaque = AV_NOPTS_VALUE;
119 if(codec && codec->priv_data_size){
121 s->priv_data= av_mallocz(codec->priv_data_size);
123 return AVERROR(ENOMEM);
126 if(codec->priv_class){
127 *(const AVClass**)s->priv_data = codec->priv_class;
128 av_opt_set_defaults(s->priv_data);
131 if (codec && codec->defaults) {
133 const AVCodecDefault *d = codec->defaults;
135 ret = av_opt_set(s, d->key, d->value, 0);
136 av_assert0(ret >= 0);
143 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
145 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
147 if(avctx==NULL) return NULL;
149 if(avcodec_get_context_defaults3(avctx, codec) < 0){
157 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
159 if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
160 av_log(dest, AV_LOG_ERROR,
161 "Tried to copy AVCodecContext %p into already-initialized %p\n",
163 return AVERROR(EINVAL);
167 av_free(dest->priv_data);
169 memcpy(dest, src, sizeof(*dest));
171 /* set values specific to opened codecs back to their default state */
172 dest->priv_data = NULL;
174 dest->slice_offset = NULL;
175 dest->hwaccel = NULL;
176 dest->internal = NULL;
178 /* reallocate values that should be allocated separately */
180 dest->extradata = NULL;
181 dest->intra_matrix = NULL;
182 dest->inter_matrix = NULL;
183 dest->rc_override = NULL;
185 dest->rc_eq = av_strdup(src->rc_eq);
187 return AVERROR(ENOMEM);
190 #define alloc_and_copy_or_fail(obj, size, pad) \
191 if (src->obj && size > 0) { \
192 dest->obj = av_malloc(size + pad); \
195 memcpy(dest->obj, src->obj, size); \
197 memset(((uint8_t *) dest->obj) + size, 0, pad); \
199 alloc_and_copy_or_fail(extradata, src->extradata_size,
200 FF_INPUT_BUFFER_PADDING_SIZE);
201 alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
202 alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
203 alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
204 alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);
205 #undef alloc_and_copy_or_fail
210 av_freep(&dest->rc_override);
211 av_freep(&dest->intra_matrix);
212 av_freep(&dest->inter_matrix);
213 av_freep(&dest->extradata);
214 av_freep(&dest->rc_eq);
215 return AVERROR(ENOMEM);
218 const AVClass *avcodec_get_class(void)
220 return &av_codec_context_class;
223 #define FOFFSET(x) offsetof(AVFrame,x)
225 static const AVOption frame_options[]={
226 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
227 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
228 {"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
229 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
230 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
231 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
232 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},
233 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},
234 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
238 static const AVClass av_frame_class = {
239 .class_name = "AVFrame",
241 .option = frame_options,
242 .version = LIBAVUTIL_VERSION_INT,
245 const AVClass *avcodec_get_frame_class(void)
247 return &av_frame_class;
250 #define SROFFSET(x) offsetof(AVSubtitleRect,x)
252 static const AVOption subtitle_rect_options[]={
253 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
254 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
255 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
256 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
257 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
258 {"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},
259 {"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},
263 static const AVClass av_subtitle_rect_class = {
264 .class_name = "AVSubtitleRect",
266 .option = subtitle_rect_options,
267 .version = LIBAVUTIL_VERSION_INT,
270 const AVClass *avcodec_get_subtitle_rect_class(void)
272 return &av_subtitle_rect_class;