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/*

 * Copyright (c) 2001 Fabrice Bellard

 * Copyright (c) 2002-2004 Michael Niedermayer 

 *

 * 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               /* FLT_MIN, FLT_MAX */

#include 

#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                  = avcodec_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 (codec)

        s->codec_id = codec->id;

    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_buffer2         = avcodec_default_get_buffer2;

    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->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);

    }

    av_opt_free(dest);

    av_free(dest->priv_data);

    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);

    alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);

#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;

}