/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */


#include "vp8/common/onyxc_int.h"
#if CONFIG_POSTPROC
#include "vp8/common/postproc.h"
#endif
#include "vp8/common/onyxd.h"
#include "onyxd_int.h"
#include "vpx_mem/vpx_mem.h"
#include "vp8/common/alloccommon.h"
#include "vp8/common/loopfilter.h"
#include "vp8/common/swapyv12buffer.h"
#include "vp8/common/threading.h"
#include "decoderthreading.h"
#include <stdio.h>
#include <assert.h>

#include "vp8/common/quant_common.h"
#include "vp8/common/reconintra.h"
#include "./vpx_dsp_rtcd.h"
#include "./vpx_scale_rtcd.h"
#include "vpx_scale/vpx_scale.h"
#include "vp8/common/systemdependent.h"
#include "vpx_ports/vpx_once.h"
#include "vpx_ports/vpx_timer.h"
#include "detokenize.h"
#if CONFIG_ERROR_CONCEALMENT
#include "error_concealment.h"
#endif
#if ARCH_ARM
#include "vpx_ports/arm.h"
#endif

extern void vp8_init_loop_filter(VP8_COMMON *cm);
extern void vp8cx_init_de_quantizer(VP8D_COMP *pbi);
static int get_free_fb (VP8_COMMON *cm);
static void ref_cnt_fb (int *buf, int *idx, int new_idx);

static void initialize_dec(void) {
    static volatile int init_done = 0;

    if (!init_done)
    {
        vpx_dsp_rtcd();
        vp8_init_intra_predictors();
        init_done = 1;
    }
}

static void remove_decompressor(VP8D_COMP *pbi)
{
#if CONFIG_ERROR_CONCEALMENT
    vp8_de_alloc_overlap_lists(pbi);
#endif
    vp8_remove_common(&pbi->common);
    vpx_free(pbi);
}

static struct VP8D_COMP * create_decompressor(VP8D_CONFIG *oxcf)
{
    VP8D_COMP *pbi = vpx_memalign(32, sizeof(VP8D_COMP));

    if (!pbi)
        return NULL;

    memset(pbi, 0, sizeof(VP8D_COMP));

    if (setjmp(pbi->common.error.jmp))
    {
        pbi->common.error.setjmp = 0;
        remove_decompressor(pbi);
        return 0;
    }

    pbi->common.error.setjmp = 1;

    vp8_create_common(&pbi->common);

    pbi->common.current_video_frame = 0;
    pbi->ready_for_new_data = 1;

    /* vp8cx_init_de_quantizer() is first called here. Add check in frame_init_dequantizer() to avoid
     *  unnecessary calling of vp8cx_init_de_quantizer() for every frame.
     */
    vp8cx_init_de_quantizer(pbi);

    vp8_loop_filter_init(&pbi->common);

    pbi->common.error.setjmp = 0;

#if CONFIG_ERROR_CONCEALMENT
    pbi->ec_enabled = oxcf->error_concealment;
    pbi->overlaps = NULL;
#else
    (void)oxcf;
    pbi->ec_enabled = 0;
#endif
    /* Error concealment is activated after a key frame has been
     * decoded without errors when error concealment is enabled.
     */
    pbi->ec_active = 0;

    pbi->decoded_key_frame = 0;

    /* Independent partitions is activated when a frame updates the
     * token probability table to have equal probabilities over the
     * PREV_COEF context.
     */
    pbi->independent_partitions = 0;

    vp8_setup_block_dptrs(&pbi->mb);

    once(initialize_dec);

    return pbi;
}

vpx_codec_err_t vp8dx_get_reference(VP8D_COMP *pbi, enum vpx_ref_frame_type ref_frame_flag, YV12_BUFFER_CONFIG *sd)
{
    VP8_COMMON *cm = &pbi->common;
    int ref_fb_idx;

    if (ref_frame_flag == VP8_LAST_FRAME)
        ref_fb_idx = cm->lst_fb_idx;
    else if (ref_frame_flag == VP8_GOLD_FRAME)
        ref_fb_idx = cm->gld_fb_idx;
    else if (ref_frame_flag == VP8_ALTR_FRAME)
        ref_fb_idx = cm->alt_fb_idx;
    else{
        vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
            "Invalid reference frame");
        return pbi->common.error.error_code;
    }

    if(cm->yv12_fb[ref_fb_idx].y_height != sd->y_height ||
        cm->yv12_fb[ref_fb_idx].y_width != sd->y_width ||
        cm->yv12_fb[ref_fb_idx].uv_height != sd->uv_height ||
        cm->yv12_fb[ref_fb_idx].uv_width != sd->uv_width){
        vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
            "Incorrect buffer dimensions");
    }
    else
        vp8_yv12_copy_frame(&cm->yv12_fb[ref_fb_idx], sd);

    return pbi->common.error.error_code;
}


vpx_codec_err_t vp8dx_set_reference(VP8D_COMP *pbi, enum vpx_ref_frame_type ref_frame_flag, YV12_BUFFER_CONFIG *sd)
{
    VP8_COMMON *cm = &pbi->common;
    int *ref_fb_ptr = NULL;
    int free_fb;

    if (ref_frame_flag == VP8_LAST_FRAME)
        ref_fb_ptr = &cm->lst_fb_idx;
    else if (ref_frame_flag == VP8_GOLD_FRAME)
        ref_fb_ptr = &cm->gld_fb_idx;
    else if (ref_frame_flag == VP8_ALTR_FRAME)
        ref_fb_ptr = &cm->alt_fb_idx;
    else{
        vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
            "Invalid reference frame");
        return pbi->common.error.error_code;
    }

    if(cm->yv12_fb[*ref_fb_ptr].y_height != sd->y_height ||
        cm->yv12_fb[*ref_fb_ptr].y_width != sd->y_width ||
        cm->yv12_fb[*ref_fb_ptr].uv_height != sd->uv_height ||
        cm->yv12_fb[*ref_fb_ptr].uv_width != sd->uv_width){
        vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
            "Incorrect buffer dimensions");
    }
    else{
        /* Find an empty frame buffer. */
        free_fb = get_free_fb(cm);
        /* Decrease fb_idx_ref_cnt since it will be increased again in
         * ref_cnt_fb() below. */
        cm->fb_idx_ref_cnt[free_fb]--;

        /* Manage the reference counters and copy image. */
        ref_cnt_fb (cm->fb_idx_ref_cnt, ref_fb_ptr, free_fb);
        vp8_yv12_copy_frame(sd, &cm->yv12_fb[*ref_fb_ptr]);
    }

   return pbi->common.error.error_code;
}

static int get_free_fb (VP8_COMMON *cm)
{
    int i;
    for (i = 0; i < NUM_YV12_BUFFERS; i++)
        if (cm->fb_idx_ref_cnt[i] == 0)
            break;

    assert(i < NUM_YV12_BUFFERS);
    cm->fb_idx_ref_cnt[i] = 1;
    return i;
}

static void ref_cnt_fb (int *buf, int *idx, int new_idx)
{
    if (buf[*idx] > 0)
        buf[*idx]--;

    *idx = new_idx;

    buf[new_idx]++;
}

/* If any buffer copy / swapping is signalled it should be done here. */
static int swap_frame_buffers (VP8_COMMON *cm)
{
    int err = 0;

    /* The alternate reference frame or golden frame can be updated
     *  using the new, last, or golden/alt ref frame.  If it
     *  is updated using the newly decoded frame it is a refresh.
     *  An update using the last or golden/alt ref frame is a copy.
     */
    if (cm->copy_buffer_to_arf)
    {
        int new_fb = 0;

        if (cm->copy_buffer_to_arf == 1)
            new_fb = cm->lst_fb_idx;
        else if (cm->copy_buffer_to_arf == 2)
            new_fb = cm->gld_fb_idx;
        else
            err = -1;

        ref_cnt_fb (cm->fb_idx_ref_cnt, &cm->alt_fb_idx, new_fb);
    }

    if (cm->copy_buffer_to_gf)
    {
        int new_fb = 0;

        if (cm->copy_buffer_to_gf == 1)
            new_fb = cm->lst_fb_idx;
        else if (cm->copy_buffer_to_gf == 2)
            new_fb = cm->alt_fb_idx;
        else
            err = -1;

        ref_cnt_fb (cm->fb_idx_ref_cnt, &cm->gld_fb_idx, new_fb);
    }

    if (cm->refresh_golden_frame)
        ref_cnt_fb (cm->fb_idx_ref_cnt, &cm->gld_fb_idx, cm->new_fb_idx);

    if (cm->refresh_alt_ref_frame)
        ref_cnt_fb (cm->fb_idx_ref_cnt, &cm->alt_fb_idx, cm->new_fb_idx);

    if (cm->refresh_last_frame)
    {
        ref_cnt_fb (cm->fb_idx_ref_cnt, &cm->lst_fb_idx, cm->new_fb_idx);

        cm->frame_to_show = &cm->yv12_fb[cm->lst_fb_idx];
    }
    else
        cm->frame_to_show = &cm->yv12_fb[cm->new_fb_idx];

    cm->fb_idx_ref_cnt[cm->new_fb_idx]--;

    return err;
}

static int check_fragments_for_errors(VP8D_COMP *pbi)
{
    if (!pbi->ec_active &&
        pbi->fragments.count <= 1 && pbi->fragments.sizes[0] == 0)
    {
        VP8_COMMON *cm = &pbi->common;

        /* If error concealment is disabled we won't signal missing frames
         * to the decoder.
         */
        if (cm->fb_idx_ref_cnt[cm->lst_fb_idx] > 1)
        {
            /* The last reference shares buffer with another reference
             * buffer. Move it to its own buffer before setting it as
             * corrupt, otherwise we will make multiple buffers corrupt.
             */
            const int prev_idx = cm->lst_fb_idx;
            cm->fb_idx_ref_cnt[prev_idx]--;
            cm->lst_fb_idx = get_free_fb(cm);
            vp8_yv12_copy_frame(&cm->yv12_fb[prev_idx],
                                    &cm->yv12_fb[cm->lst_fb_idx]);
        }
        /* This is used to signal that we are missing frames.
         * We do not know if the missing frame(s) was supposed to update
         * any of the reference buffers, but we act conservative and
         * mark only the last buffer as corrupted.
         */
        cm->yv12_fb[cm->lst_fb_idx].corrupted = 1;

        /* Signal that we have no frame to show. */
        cm->show_frame = 0;

        /* Nothing more to do. */
        return 0;
    }

    return 1;
}

int vp8dx_receive_compressed_data(VP8D_COMP *pbi, size_t size,
                                  const uint8_t *source,
                                  int64_t time_stamp)
{
    VP8_COMMON *cm = &pbi->common;
    int retcode = -1;
    (void)size;
    (void)source;

    pbi->common.error.error_code = VPX_CODEC_OK;

    retcode = check_fragments_for_errors(pbi);
    if(retcode <= 0)
        return retcode;

    cm->new_fb_idx = get_free_fb (cm);

    /* setup reference frames for vp8_decode_frame */
    pbi->dec_fb_ref[INTRA_FRAME]  = &cm->yv12_fb[cm->new_fb_idx];
    pbi->dec_fb_ref[LAST_FRAME]   = &cm->yv12_fb[cm->lst_fb_idx];
    pbi->dec_fb_ref[GOLDEN_FRAME] = &cm->yv12_fb[cm->gld_fb_idx];
    pbi->dec_fb_ref[ALTREF_FRAME] = &cm->yv12_fb[cm->alt_fb_idx];

    if (setjmp(pbi->common.error.jmp))
    {
       /* We do not know if the missing frame(s) was supposed to update
        * any of the reference buffers, but we act conservative and
        * mark only the last buffer as corrupted.
        */
        cm->yv12_fb[cm->lst_fb_idx].corrupted = 1;

        if (cm->fb_idx_ref_cnt[cm->new_fb_idx] > 0)
          cm->fb_idx_ref_cnt[cm->new_fb_idx]--;

        goto decode_exit;
    }

    pbi->common.error.setjmp = 1;

    retcode = vp8_decode_frame(pbi);

    if (retcode < 0)
    {
        if (cm->fb_idx_ref_cnt[cm->new_fb_idx] > 0)
          cm->fb_idx_ref_cnt[cm->new_fb_idx]--;

        pbi->common.error.error_code = VPX_CODEC_ERROR;
        goto decode_exit;
    }

    if (swap_frame_buffers (cm))
    {
        pbi->common.error.error_code = VPX_CODEC_ERROR;
        goto decode_exit;
    }

    vp8_clear_system_state();

    if (cm->show_frame)
    {
        cm->current_video_frame++;
        cm->show_frame_mi = cm->mi;
    }

    #if CONFIG_ERROR_CONCEALMENT
    /* swap the mode infos to storage for future error concealment */
    if (pbi->ec_enabled && pbi->common.prev_mi)
    {
        MODE_INFO* tmp = pbi->common.prev_mi;
        int row, col;
        pbi->common.prev_mi = pbi->common.mi;
        pbi->common.mi = tmp;

        /* Propagate the segment_ids to the next frame */
        for (row = 0; row < pbi->common.mb_rows; ++row)
        {
            for (col = 0; col < pbi->common.mb_cols; ++col)
            {
                const int i = row*pbi->common.mode_info_stride + col;
                pbi->common.mi[i].mbmi.segment_id =
                        pbi->common.prev_mi[i].mbmi.segment_id;
            }
        }
    }
#endif

    pbi->ready_for_new_data = 0;
    pbi->last_time_stamp = time_stamp;

decode_exit:
    pbi->common.error.setjmp = 0;
    vp8_clear_system_state();
    return retcode;
}
int vp8dx_get_raw_frame(VP8D_COMP *pbi, YV12_BUFFER_CONFIG *sd, int64_t *time_stamp, int64_t *time_end_stamp, vp8_ppflags_t *flags)
{
    int ret = -1;

    if (pbi->ready_for_new_data == 1)
        return ret;

    /* ie no raw frame to show!!! */
    if (pbi->common.show_frame == 0)
        return ret;

    pbi->ready_for_new_data = 1;
    *time_stamp = pbi->last_time_stamp;
    *time_end_stamp = 0;

#if CONFIG_POSTPROC
    ret = vp8_post_proc_frame(&pbi->common, sd, flags);
#else
    (void)flags;

    if (pbi->common.frame_to_show)
    {
        *sd = *pbi->common.frame_to_show;
        sd->y_width = pbi->common.Width;
        sd->y_height = pbi->common.Height;
        sd->uv_height = pbi->common.Height / 2;
        ret = 0;
    }
    else
    {
        ret = -1;
    }

#endif /*!CONFIG_POSTPROC*/
    vp8_clear_system_state();
    return ret;
}


/* This function as written isn't decoder specific, but the encoder has
 * much faster ways of computing this, so it's ok for it to live in a
 * decode specific file.
 */
int vp8dx_references_buffer( VP8_COMMON *oci, int ref_frame )
{
    const MODE_INFO *mi = oci->mi;
    int mb_row, mb_col;

    for (mb_row = 0; mb_row < oci->mb_rows; mb_row++)
    {
        for (mb_col = 0; mb_col < oci->mb_cols; mb_col++,mi++)
        {
            if( mi->mbmi.ref_frame == ref_frame)
              return 1;
        }
        mi++;
    }
    return 0;

}

int vp8_create_decoder_instances(struct frame_buffers *fb, VP8D_CONFIG *oxcf)
{
    if(!fb->use_frame_threads)
    {
        /* decoder instance for single thread mode */
        fb->pbi[0] = create_decompressor(oxcf);
        if(!fb->pbi[0])
            return VPX_CODEC_ERROR;

#if CONFIG_MULTITHREAD
        /* enable row-based threading only when use_frame_threads
         * is disabled */
        fb->pbi[0]->max_threads = oxcf->max_threads;
        vp8_decoder_create_threads(fb->pbi[0]);
#endif
    }
    else
    {
        /* TODO : create frame threads and decoder instances for each
         * thread here */
    }

    return VPX_CODEC_OK;
}

int vp8_remove_decoder_instances(struct frame_buffers *fb)
{
    if(!fb->use_frame_threads)
    {
        VP8D_COMP *pbi = fb->pbi[0];

        if (!pbi)
            return VPX_CODEC_ERROR;
#if CONFIG_MULTITHREAD
        if (pbi->b_multithreaded_rd)
            vp8mt_de_alloc_temp_buffers(pbi, pbi->common.mb_rows);
        vp8_decoder_remove_threads(pbi);
#endif

        /* decoder instance for single thread mode */
        remove_decompressor(pbi);
    }
    else
    {
        /* TODO : remove frame threads and decoder instances for each
         * thread here */
    }

    return VPX_CODEC_OK;
}