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/*

 * Copyright (c) 2008 BBC, Anuradha Suraparaju 

 *

 * 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

* function definitions common to libschroedinger decoder and encoder

*/

#include "libavutil/attributes.h"

#include "libavutil/mem.h"

#include "libschroedinger.h"

static const SchroVideoFormatInfo ff_schro_video_format_info[] = {

    { 640,  480,  24000, 1001},

    { 176,  120,  15000, 1001},

    { 176,  144,  25,    2   },

    { 352,  240,  15000, 1001},

    { 352,  288,  25,    2   },

    { 704,  480,  15000, 1001},

    { 704,  576,  25,    2   },

    { 720,  480,  30000, 1001},

    { 720,  576,  25,    1   },

    { 1280, 720,  60000, 1001},

    { 1280, 720,  50,    1   },

    { 1920, 1080, 30000, 1001},

    { 1920, 1080, 25,    1   },

    { 1920, 1080, 60000, 1001},

    { 1920, 1080, 50,    1   },

    { 2048, 1080, 24,    1   },

    { 4096, 2160, 24,    1   },

};

static unsigned int get_video_format_idx(AVCodecContext *avctx)

{

    unsigned int ret_idx = 0;

    unsigned int idx;

    unsigned int num_formats = sizeof(ff_schro_video_format_info) /

                               sizeof(ff_schro_video_format_info[0]);

    for (idx = 1; idx < num_formats; ++idx) {

        const SchroVideoFormatInfo *vf = &ff_schro_video_format_info[idx];

        if (avctx->width  == vf->width &&

            avctx->height == vf->height) {

            ret_idx = idx;

            if (avctx->time_base.den == vf->frame_rate_num &&

                avctx->time_base.num == vf->frame_rate_denom)

                return idx;

        }

    }

    return ret_idx;

}

av_cold void ff_schro_queue_init(FFSchroQueue *queue)

{

    queue->p_head = queue->p_tail = NULL;

    queue->size = 0;

}

void ff_schro_queue_free(FFSchroQueue *queue, void (*free_func)(void *))

{

    while (queue->p_head)

        free_func(ff_schro_queue_pop(queue));

}

int ff_schro_queue_push_back(FFSchroQueue *queue, void *p_data)

{

    FFSchroQueueElement *p_new = av_mallocz(sizeof(FFSchroQueueElement));

    if (!p_new)

        return -1;

    p_new->data = p_data;

    if (!queue->p_head)

        queue->p_head = p_new;

    else

        queue->p_tail->next = p_new;

    queue->p_tail = p_new;

    ++queue->size;

    return 0;

}

void *ff_schro_queue_pop(FFSchroQueue *queue)

{

    FFSchroQueueElement *top = queue->p_head;

    if (top) {

        void *data = top->data;

        queue->p_head = queue->p_head->next;

        --queue->size;

        av_freep(&top);

        return data;

    }

    return NULL;

}

/**

* Schroedinger video preset table. Ensure that this tables matches up correctly

* with the ff_schro_video_format_info table.

*/

static const SchroVideoFormatEnum ff_schro_video_formats[]={

    SCHRO_VIDEO_FORMAT_CUSTOM     ,

    SCHRO_VIDEO_FORMAT_QSIF       ,

    SCHRO_VIDEO_FORMAT_QCIF       ,

    SCHRO_VIDEO_FORMAT_SIF        ,

    SCHRO_VIDEO_FORMAT_CIF        ,

    SCHRO_VIDEO_FORMAT_4SIF       ,

    SCHRO_VIDEO_FORMAT_4CIF       ,

    SCHRO_VIDEO_FORMAT_SD480I_60  ,

    SCHRO_VIDEO_FORMAT_SD576I_50  ,

    SCHRO_VIDEO_FORMAT_HD720P_60  ,

    SCHRO_VIDEO_FORMAT_HD720P_50  ,

    SCHRO_VIDEO_FORMAT_HD1080I_60 ,

    SCHRO_VIDEO_FORMAT_HD1080I_50 ,

    SCHRO_VIDEO_FORMAT_HD1080P_60 ,

    SCHRO_VIDEO_FORMAT_HD1080P_50 ,

    SCHRO_VIDEO_FORMAT_DC2K_24    ,

    SCHRO_VIDEO_FORMAT_DC4K_24    ,

};

SchroVideoFormatEnum ff_get_schro_video_format_preset(AVCodecContext *avctx)

{

    unsigned int num_formats = sizeof(ff_schro_video_formats) /

                               sizeof(ff_schro_video_formats[0]);

    unsigned int idx = get_video_format_idx(avctx);

    return (idx < num_formats) ? ff_schro_video_formats[idx] :

                                 SCHRO_VIDEO_FORMAT_CUSTOM;

}

int ff_get_schro_frame_format (SchroChromaFormat schro_pix_fmt,

                               SchroFrameFormat  *schro_frame_fmt)

{

    unsigned int num_formats = sizeof(schro_pixel_format_map) /

                               sizeof(schro_pixel_format_map[0]);

    int idx;

    for (idx = 0; idx < num_formats; ++idx) {

        if (schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) {

            *schro_frame_fmt = schro_pixel_format_map[idx].schro_frame_fmt;

            return 0;

        }

    }

    return -1;

}

static void free_schro_frame(SchroFrame *frame, void *priv)

{

    AVPicture *p_pic = priv;

    if (!p_pic)

        return;

    avpicture_free(p_pic);

    av_freep(&p_pic);

}

SchroFrame *ff_create_schro_frame(AVCodecContext *avctx,

                                  SchroFrameFormat schro_frame_fmt)

{

    AVPicture *p_pic;

    SchroFrame *p_frame;

    int y_width, uv_width;

    int y_height, uv_height;

    int i;

    y_width   = avctx->width;

    y_height  = avctx->height;

    uv_width  = y_width  >> (SCHRO_FRAME_FORMAT_H_SHIFT(schro_frame_fmt));

    uv_height = y_height >> (SCHRO_FRAME_FORMAT_V_SHIFT(schro_frame_fmt));

    p_pic = av_mallocz(sizeof(AVPicture));

    if (!p_pic || avpicture_alloc(p_pic, avctx->pix_fmt, y_width, y_height) < 0) {

        av_free(p_pic);

        return NULL;

    }

    p_frame         = schro_frame_new();

    p_frame->format = schro_frame_fmt;

    p_frame->width  = y_width;

    p_frame->height = y_height;

    schro_frame_set_free_callback(p_frame, free_schro_frame, (void *)p_pic);

    for (i = 0; i < 3; ++i) {

        p_frame->components[i].width  = i ? uv_width : y_width;

        p_frame->components[i].stride = p_pic->linesize[i];

        p_frame->components[i].height = i ? uv_height : y_height;

        p_frame->components[i].length =

                 p_frame->components[i].stride * p_frame->components[i].height;

        p_frame->components[i].data   = p_pic->data[i];

        if (i) {

            p_frame->components[i].v_shift =

                SCHRO_FRAME_FORMAT_V_SHIFT(p_frame->format);

            p_frame->components[i].h_shift =

                SCHRO_FRAME_FORMAT_H_SHIFT(p_frame->format);

        }

    }

    return p_frame;

}