/*

  * Copyright (c) 2001 Fabrice Bellard

  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * Options definition for AVCodecContext.
  */
 
 #include "avcodec.h"

 #include "internal.h"
 #include "libavutil/avassert.h"

 #include "libavutil/mem.h"

 #include "libavutil/opt.h"

 #include <float.h>              /* FLT_MIN, FLT_MAX */

 #include <string.h>

 #include "options_table.h"
 

 static const char* context_to_name(void* ptr) {
     AVCodecContext *avc= ptr;
 
     if(avc && avc->codec && avc->codec->name)
         return avc->codec->name;
     else
         return "NULL";
 }
 

 static void *codec_child_next(void *obj, void *prev)

 {
     AVCodecContext *s = obj;

     if (!prev && s->codec && s->codec->priv_class && s->priv_data)
         return s->priv_data;
     return NULL;
 }
 
 static const AVClass *codec_child_class_next(const AVClass *prev)
 {
     AVCodec *c = NULL;

     /* find the codec that corresponds to prev */
     while (prev && (c = av_codec_next(c)))
         if (c->priv_class == prev)
             break;

     /* find next codec with priv options */
     while (c = av_codec_next(c))
         if (c->priv_class)
             return c->priv_class;

     return NULL;
 }
 

 static AVClassCategory get_category(void *ptr)

 {

     AVCodecContext* avctx = ptr;

     if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
     else                                     return AV_CLASS_CATEGORY_ENCODER;
 }
 

 static const AVClass av_codec_context_class = {
     .class_name              = "AVCodecContext",
     .item_name               = context_to_name,
     .option                  = options,
     .version                 = LIBAVUTIL_VERSION_INT,

     .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),

     .child_next              = codec_child_next,
     .child_class_next        = codec_child_class_next,

     .category                = AV_CLASS_CATEGORY_ENCODER,

     .get_category            = get_category,

 };

 #if FF_API_ALLOC_CONTEXT

 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType codec_type){

     AVCodec c= {0};
     c.type= codec_type;
     avcodec_get_context_defaults3(s, &c);

 }
 #endif
 

 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
 {

     int flags=0;
     memset(s, 0, sizeof(AVCodecContext));
 

     s->av_class = &av_codec_context_class;

     s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;

     if(s->codec_type == AVMEDIA_TYPE_AUDIO)

         flags= AV_OPT_FLAG_AUDIO_PARAM;

     else if(s->codec_type == AVMEDIA_TYPE_VIDEO)

         flags= AV_OPT_FLAG_VIDEO_PARAM;

     else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)

         flags= AV_OPT_FLAG_SUBTITLE_PARAM;
     av_opt_set_defaults2(s, flags, flags);
 

     s->time_base           = (AVRational){0,1};
     s->get_buffer          = avcodec_default_get_buffer;
     s->release_buffer      = avcodec_default_release_buffer;
     s->get_format          = avcodec_default_get_format;
     s->execute             = avcodec_default_execute;
     s->execute2            = avcodec_default_execute2;
     s->sample_aspect_ratio = (AVRational){0,1};

     s->pix_fmt             = AV_PIX_FMT_NONE;

     s->sample_fmt          = AV_SAMPLE_FMT_NONE;

     s->timecode_frame_start = -1;

     s->reget_buffer        = avcodec_default_reget_buffer;
     s->reordered_opaque    = AV_NOPTS_VALUE;

     if(codec && codec->priv_data_size){
         if(!s->priv_data){
             s->priv_data= av_mallocz(codec->priv_data_size);
             if (!s->priv_data) {
                 return AVERROR(ENOMEM);
             }
         }
         if(codec->priv_class){

             *(const AVClass**)s->priv_data = codec->priv_class;

             av_opt_set_defaults(s->priv_data);
         }
     }

     if (codec && codec->defaults) {
         int ret;

         const AVCodecDefault *d = codec->defaults;

         while (d->key) {

             ret = av_opt_set(s, d->key, d->value, 0);

             av_assert0(ret >= 0);
             d++;
         }
     }

     return 0;
 }
 

 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
 {

     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
 
     if(avctx==NULL) return NULL;
 
     if(avcodec_get_context_defaults3(avctx, codec) < 0){
         av_free(avctx);
         return NULL;
     }
 
     return avctx;
 }
 

 #if FF_API_ALLOC_CONTEXT

 AVCodecContext *avcodec_alloc_context2(enum AVMediaType codec_type){

     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
 
     if(avctx==NULL) return NULL;
 
     avcodec_get_context_defaults2(avctx, codec_type);
 
     return avctx;
 }
 
 void avcodec_get_context_defaults(AVCodecContext *s){

     avcodec_get_context_defaults2(s, AVMEDIA_TYPE_UNKNOWN);

 }
 
 AVCodecContext *avcodec_alloc_context(void){

     return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);

 }

 #endif

 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
 {

     if (avcodec_is_open(dest)) { // check that the dest context is uninitialized

         av_log(dest, AV_LOG_ERROR,
                "Tried to copy AVCodecContext %p into already-initialized %p\n",
                src, dest);
         return AVERROR(EINVAL);
     }
     memcpy(dest, src, sizeof(*dest));
 
     /* set values specific to opened codecs back to their default state */
     dest->priv_data       = NULL;
     dest->codec           = NULL;
     dest->slice_offset    = NULL;
     dest->hwaccel         = NULL;
     dest->thread_opaque   = NULL;

     dest->internal        = NULL;

 
     /* reallocate values that should be allocated separately */
     dest->rc_eq           = NULL;
     dest->extradata       = NULL;
     dest->intra_matrix    = NULL;
     dest->inter_matrix    = NULL;
     dest->rc_override     = NULL;
     if (src->rc_eq) {
         dest->rc_eq = av_strdup(src->rc_eq);
         if (!dest->rc_eq)
             return AVERROR(ENOMEM);
     }
 
 #define alloc_and_copy_or_fail(obj, size, pad) \
     if (src->obj && size > 0) { \
         dest->obj = av_malloc(size + pad); \
         if (!dest->obj) \
             goto fail; \
         memcpy(dest->obj, src->obj, size); \
         if (pad) \
             memset(((uint8_t *) dest->obj) + size, 0, pad); \
     }
     alloc_and_copy_or_fail(extradata,    src->extradata_size,
                            FF_INPUT_BUFFER_PADDING_SIZE);
     alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
     alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
     alloc_and_copy_or_fail(rc_override,  src->rc_override_count * sizeof(*src->rc_override), 0);
 #undef alloc_and_copy_or_fail
 
     return 0;
 
 fail:
     av_freep(&dest->rc_override);
     av_freep(&dest->intra_matrix);
     av_freep(&dest->inter_matrix);
     av_freep(&dest->extradata);
     av_freep(&dest->rc_eq);
     return AVERROR(ENOMEM);
 }

 
 const AVClass *avcodec_get_class(void)
 {
     return &av_codec_context_class;
 }

 
 #define FOFFSET(x) offsetof(AVFrame,x)
 
 static const AVOption frame_options[]={

 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},

 {"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},

 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},

 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},

 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},

 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

 {NULL},
 };
 
 static const AVClass av_frame_class = {
     .class_name              = "AVFrame",
     .item_name               = NULL,
     .option                  = frame_options,
     .version                 = LIBAVUTIL_VERSION_INT,
 };
 
 const AVClass *avcodec_get_frame_class(void)
 {
     return &av_frame_class;
 }

 
 #define SROFFSET(x) offsetof(AVSubtitleRect,x)
 
 static const AVOption subtitle_rect_options[]={

 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},

 {"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},
 {"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},

 {NULL},
 };
 
 static const AVClass av_subtitle_rect_class = {
     .class_name             = "AVSubtitleRect",
     .item_name              = NULL,
     .option                 = subtitle_rect_options,
     .version                = LIBAVUTIL_VERSION_INT,
 };
 
 const AVClass *avcodec_get_subtitle_rect_class(void)
 {
     return &av_subtitle_rect_class;
 }