1/*
2 * Copyright (c) 2001 Fabrice Bellard
3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22/**
23 * @file
24 * Options definition for AVCodecContext.
25 */
26
27#include "avcodec.h"
28#include "internal.h"
29#include "libavutil/avassert.h"
30#include "libavutil/mem.h"
31#include "libavutil/opt.h"
32#include <float.h>              /* FLT_MIN, FLT_MAX */
33#include <string.h>
34
35#include "options_table.h"
36
37static const char* context_to_name(void* ptr) {
38    AVCodecContext *avc= ptr;
39
40    if(avc && avc->codec && avc->codec->name)
41        return avc->codec->name;
42    else
43        return "NULL";
44}
45
46static void *codec_child_next(void *obj, void *prev)
47{
48    AVCodecContext *s = obj;
49    if (!prev && s->codec && s->codec->priv_class && s->priv_data)
50        return s->priv_data;
51    return NULL;
52}
53
54static const AVClass *codec_child_class_next(const AVClass *prev)
55{
56    AVCodec *c = NULL;
57
58    /* find the codec that corresponds to prev */
59    while (prev && (c = av_codec_next(c)))
60        if (c->priv_class == prev)
61            break;
62
63    /* find next codec with priv options */
64    while (c = av_codec_next(c))
65        if (c->priv_class)
66            return c->priv_class;
67    return NULL;
68}
69
70static AVClassCategory get_category(void *ptr)
71{
72    AVCodecContext* avctx = ptr;
73    if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
74    else                                     return AV_CLASS_CATEGORY_ENCODER;
75}
76
77static 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,
87};
88
89int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
90{
91    int flags=0;
92    memset(s, 0, sizeof(AVCodecContext));
93
94    s->av_class = &av_codec_context_class;
95
96    s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
97    if (codec)
98        s->codec_id = codec->id;
99
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);
107
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;
117
118    s->reordered_opaque    = AV_NOPTS_VALUE;
119    if(codec && codec->priv_data_size){
120        if(!s->priv_data){
121            s->priv_data= av_mallocz(codec->priv_data_size);
122            if (!s->priv_data) {
123                return AVERROR(ENOMEM);
124            }
125        }
126        if(codec->priv_class){
127            *(const AVClass**)s->priv_data = codec->priv_class;
128            av_opt_set_defaults(s->priv_data);
129        }
130    }
131    if (codec && codec->defaults) {
132        int ret;
133        const AVCodecDefault *d = codec->defaults;
134        while (d->key) {
135            ret = av_opt_set(s, d->key, d->value, 0);
136            av_assert0(ret >= 0);
137            d++;
138        }
139    }
140    return 0;
141}
142
143AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
144{
145    AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
146
147    if(avctx==NULL) return NULL;
148
149    if(avcodec_get_context_defaults3(avctx, codec) < 0){
150        av_free(avctx);
151        return NULL;
152    }
153
154    return avctx;
155}
156
157void avcodec_free_context(AVCodecContext **pavctx)
158{
159    AVCodecContext *avctx = *pavctx;
160
161    if (!avctx)
162        return;
163
164    avcodec_close(avctx);
165
166    av_freep(&avctx->extradata);
167    av_freep(&avctx->subtitle_header);
168
169    av_freep(pavctx);
170}
171
172int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
173{
174    const AVCodec *orig_codec = dest->codec;
175    uint8_t *orig_priv_data = dest->priv_data;
176
177    if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
178        av_log(dest, AV_LOG_ERROR,
179               "Tried to copy AVCodecContext %p into already-initialized %p\n",
180               src, dest);
181        return AVERROR(EINVAL);
182    }
183
184    av_opt_free(dest);
185
186    memcpy(dest, src, sizeof(*dest));
187
188    dest->priv_data       = orig_priv_data;
189
190    if (orig_priv_data)
191        av_opt_copy(orig_priv_data, src->priv_data);
192
193    dest->codec           = orig_codec;
194
195    /* set values specific to opened codecs back to their default state */
196    dest->slice_offset    = NULL;
197    dest->hwaccel         = NULL;
198    dest->internal        = NULL;
199
200    /* reallocate values that should be allocated separately */
201    dest->rc_eq           = NULL;
202    dest->extradata       = NULL;
203    dest->intra_matrix    = NULL;
204    dest->inter_matrix    = NULL;
205    dest->rc_override     = NULL;
206    dest->subtitle_header = NULL;
207    if (src->rc_eq) {
208        dest->rc_eq = av_strdup(src->rc_eq);
209        if (!dest->rc_eq)
210            return AVERROR(ENOMEM);
211    }
212
213#define alloc_and_copy_or_fail(obj, size, pad) \
214    if (src->obj && size > 0) { \
215        dest->obj = av_malloc(size + pad); \
216        if (!dest->obj) \
217            goto fail; \
218        memcpy(dest->obj, src->obj, size); \
219        if (pad) \
220            memset(((uint8_t *) dest->obj) + size, 0, pad); \
221    }
222    alloc_and_copy_or_fail(extradata,    src->extradata_size,
223                           FF_INPUT_BUFFER_PADDING_SIZE);
224    alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
225    alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
226    alloc_and_copy_or_fail(rc_override,  src->rc_override_count * sizeof(*src->rc_override), 0);
227    alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);
228    av_assert0(dest->subtitle_header_size == src->subtitle_header_size);
229#undef alloc_and_copy_or_fail
230
231    return 0;
232
233fail:
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_freep(&dest->rc_eq);
239    return AVERROR(ENOMEM);
240}
241
242const AVClass *avcodec_get_class(void)
243{
244    return &av_codec_context_class;
245}
246
247#define FOFFSET(x) offsetof(AVFrame,x)
248
249static const AVOption frame_options[]={
250{"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
251{"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
252{"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
253{"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
254{"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
255{"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
256{"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},
257{"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},
258{"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
259{NULL},
260};
261
262static const AVClass av_frame_class = {
263    .class_name              = "AVFrame",
264    .item_name               = NULL,
265    .option                  = frame_options,
266    .version                 = LIBAVUTIL_VERSION_INT,
267};
268
269const AVClass *avcodec_get_frame_class(void)
270{
271    return &av_frame_class;
272}
273
274#define SROFFSET(x) offsetof(AVSubtitleRect,x)
275
276static const AVOption subtitle_rect_options[]={
277{"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
278{"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
279{"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
280{"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
281{"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
282{"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},
283{"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},
284{NULL},
285};
286
287static const AVClass av_subtitle_rect_class = {
288    .class_name             = "AVSubtitleRect",
289    .item_name              = NULL,
290    .option                 = subtitle_rect_options,
291    .version                = LIBAVUTIL_VERSION_INT,
292};
293
294const AVClass *avcodec_get_subtitle_rect_class(void)
295{
296    return &av_subtitle_rect_class;
297}
298