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/internal.h"
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33 #include <float.h> /* FLT_MIN, FLT_MAX */
36 FF_DISABLE_DEPRECATION_WARNINGS
37 #include "options_table.h"
38 FF_ENABLE_DEPRECATION_WARNINGS
40 static const char* context_to_name(void* ptr) {
41 AVCodecContext *avc= ptr;
43 if(avc && avc->codec && avc->codec->name)
44 return avc->codec->name;
49 static void *codec_child_next(void *obj, void *prev)
51 AVCodecContext *s = obj;
52 if (!prev && s->codec && s->codec->priv_class && s->priv_data)
57 static const AVClass *codec_child_class_next(const AVClass *prev)
61 /* find the codec that corresponds to prev */
62 while (prev && (c = av_codec_next(c)))
63 if (c->priv_class == prev)
66 /* find next codec with priv options */
67 while (c = av_codec_next(c))
73 static const AVClass av_codec_context_class = {
74 .class_name = "AVCodecContext",
75 .item_name = context_to_name,
76 .option = avcodec_options,
77 .version = LIBAVUTIL_VERSION_INT,
78 .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
79 .child_next = codec_child_next,
80 .child_class_next = codec_child_class_next,
83 static int init_context_defaults(AVCodecContext *s, const AVCodec *codec)
85 memset(s, 0, sizeof(AVCodecContext));
87 s->av_class = &av_codec_context_class;
89 s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
91 av_opt_set_defaults(s);
93 s->time_base = (AVRational){0,1};
94 s->framerate = (AVRational){ 0, 1 };
95 s->get_buffer2 = avcodec_default_get_buffer2;
96 s->get_format = avcodec_default_get_format;
97 s->execute = avcodec_default_execute;
98 s->execute2 = avcodec_default_execute2;
99 s->sample_aspect_ratio = (AVRational){0,1};
100 s->pix_fmt = AV_PIX_FMT_NONE;
101 s->sw_pix_fmt = AV_PIX_FMT_NONE;
102 s->sample_fmt = AV_SAMPLE_FMT_NONE;
104 s->reordered_opaque = AV_NOPTS_VALUE;
105 if(codec && codec->priv_data_size){
107 s->priv_data= av_mallocz(codec->priv_data_size);
109 return AVERROR(ENOMEM);
112 if(codec->priv_class){
113 *(const AVClass**)s->priv_data = codec->priv_class;
114 av_opt_set_defaults(s->priv_data);
117 if (codec && codec->defaults) {
119 const AVCodecDefault *d = codec->defaults;
121 ret = av_opt_set(s, d->key, d->value, 0);
122 av_assert0(ret >= 0);
129 #if FF_API_GET_CONTEXT_DEFAULTS
130 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
132 return init_context_defaults(s, codec);
136 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
138 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
143 if (init_context_defaults(avctx, codec) < 0) {
151 void avcodec_free_context(AVCodecContext **pavctx)
153 AVCodecContext *avctx = *pavctx;
158 avcodec_close(avctx);
160 av_freep(&avctx->extradata);
161 av_freep(&avctx->subtitle_header);
166 #if FF_API_COPY_CONTEXT
167 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
169 const AVCodec *orig_codec = dest->codec;
170 uint8_t *orig_priv_data = dest->priv_data;
172 if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
173 av_log(dest, AV_LOG_ERROR,
174 "Tried to copy AVCodecContext %p into already-initialized %p\n",
176 return AVERROR(EINVAL);
178 memcpy(dest, src, sizeof(*dest));
180 dest->priv_data = orig_priv_data;
181 dest->codec = orig_codec;
183 /* set values specific to opened codecs back to their default state */
184 dest->slice_offset = NULL;
185 dest->hwaccel = NULL;
186 dest->internal = NULL;
188 /* reallocate values that should be allocated separately */
189 dest->extradata = NULL;
190 dest->intra_matrix = NULL;
191 dest->inter_matrix = NULL;
192 dest->rc_override = NULL;
193 dest->subtitle_header = NULL;
194 dest->hw_frames_ctx = NULL;
196 FF_DISABLE_DEPRECATION_WARNINGS
199 dest->rc_eq = av_strdup(src->rc_eq);
201 return AVERROR(ENOMEM);
203 FF_ENABLE_DEPRECATION_WARNINGS
206 #define alloc_and_copy_or_fail(obj, size, pad) \
207 if (src->obj && size > 0) { \
208 dest->obj = av_malloc(size + pad); \
211 memcpy(dest->obj, src->obj, size); \
213 memset(((uint8_t *) dest->obj) + size, 0, pad); \
215 alloc_and_copy_or_fail(extradata, src->extradata_size,
216 AV_INPUT_BUFFER_PADDING_SIZE);
217 alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
218 alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
219 alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
220 alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 0);
221 dest->subtitle_header_size = src->subtitle_header_size;
222 #undef alloc_and_copy_or_fail
224 if (src->hw_frames_ctx) {
225 dest->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
226 if (!dest->hw_frames_ctx)
233 av_freep(&dest->subtitle_header);
234 av_freep(&dest->rc_override);
235 av_freep(&dest->intra_matrix);
236 av_freep(&dest->inter_matrix);
237 av_freep(&dest->extradata);
238 av_buffer_unref(&dest->hw_frames_ctx);
240 FF_DISABLE_DEPRECATION_WARNINGS
241 av_freep(&dest->rc_eq);
242 FF_ENABLE_DEPRECATION_WARNINGS
244 return AVERROR(ENOMEM);
248 const AVClass *avcodec_get_class(void)
250 return &av_codec_context_class;