2 * Copyright (c) 2001 Fabrice Bellard
3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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 const AVClass av_codec_context_class = {
71 .class_name = "AVCodecContext",
72 .item_name = context_to_name,
73 .option = avcodec_options,
74 .version = LIBAVUTIL_VERSION_INT,
75 .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
76 .child_next = codec_child_next,
77 .child_class_next = codec_child_class_next,
80 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
82 memset(s, 0, sizeof(AVCodecContext));
84 s->av_class = &av_codec_context_class;
86 s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
88 av_opt_set_defaults(s);
90 s->time_base = (AVRational){0,1};
91 s->framerate = (AVRational){ 0, 1 };
92 s->get_buffer2 = avcodec_default_get_buffer2;
93 s->get_format = avcodec_default_get_format;
94 s->execute = avcodec_default_execute;
95 s->execute2 = avcodec_default_execute2;
96 s->sample_aspect_ratio = (AVRational){0,1};
97 s->pix_fmt = AV_PIX_FMT_NONE;
98 s->sample_fmt = AV_SAMPLE_FMT_NONE;
100 s->reordered_opaque = AV_NOPTS_VALUE;
101 if(codec && codec->priv_data_size){
103 s->priv_data= av_mallocz(codec->priv_data_size);
105 return AVERROR(ENOMEM);
108 if(codec->priv_class){
109 *(const AVClass**)s->priv_data = codec->priv_class;
110 av_opt_set_defaults(s->priv_data);
113 if (codec && codec->defaults) {
115 const AVCodecDefault *d = codec->defaults;
117 ret = av_opt_set(s, d->key, d->value, 0);
118 av_assert0(ret >= 0);
125 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
127 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
132 if(avcodec_get_context_defaults3(avctx, codec) < 0){
140 void avcodec_free_context(AVCodecContext **pavctx)
142 AVCodecContext *avctx = *pavctx;
147 avcodec_close(avctx);
149 av_freep(&avctx->extradata);
150 av_freep(&avctx->subtitle_header);
155 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
157 const AVCodec *orig_codec = dest->codec;
158 uint8_t *orig_priv_data = dest->priv_data;
160 if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
161 av_log(dest, AV_LOG_ERROR,
162 "Tried to copy AVCodecContext %p into already-initialized %p\n",
164 return AVERROR(EINVAL);
166 memcpy(dest, src, sizeof(*dest));
168 dest->priv_data = orig_priv_data;
169 dest->codec = orig_codec;
171 /* set values specific to opened codecs back to their default state */
172 dest->slice_offset = NULL;
173 dest->hwaccel = NULL;
174 dest->internal = NULL;
176 /* reallocate values that should be allocated separately */
178 dest->extradata = NULL;
179 dest->intra_matrix = NULL;
180 dest->inter_matrix = NULL;
181 dest->rc_override = NULL;
182 dest->subtitle_header = NULL;
184 dest->rc_eq = av_strdup(src->rc_eq);
186 return AVERROR(ENOMEM);
189 #define alloc_and_copy_or_fail(obj, size, pad) \
190 if (src->obj && size > 0) { \
191 dest->obj = av_malloc(size + pad); \
194 memcpy(dest->obj, src->obj, size); \
196 memset(((uint8_t *) dest->obj) + size, 0, pad); \
198 alloc_and_copy_or_fail(extradata, src->extradata_size,
199 FF_INPUT_BUFFER_PADDING_SIZE);
200 alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
201 alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
202 alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
203 alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 0);
204 dest->subtitle_header_size = src->subtitle_header_size;
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;