/*
  * Electronic Arts TQI Video Decoder
  * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
  *
  * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 /**

  * @file

  * Electronic Arts TQI Video Decoder

  * @author Peter Ross <pross@xvid.org>
  * @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI

  */
 
 #include "avcodec.h"

 #include "blockdsp.h"

 #include "bswapdsp.h"

 #include "get_bits.h"

 #include "aandcttab.h"

 #include "eaidct.h"

 #include "idctdsp.h"

 #include "internal.h"

 #include "mpeg12.h"
 
 typedef struct TqiContext {

     AVCodecContext *avctx;

     GetBitContext gb;
     BlockDSPContext bdsp;

     BswapDSPContext bsdsp;

     IDCTDSPContext idsp;
     ScanTable intra_scantable;
 

     void *bitstream_buf;

     unsigned int bitstream_buf_size;

 
     int mb_x, mb_y;
     uint16_t intra_matrix[64];
     int last_dc[3];
 

     DECLARE_ALIGNED(16, int16_t, block)[6][64];

 } TqiContext;
 
 static av_cold int tqi_decode_init(AVCodecContext *avctx)
 {
     TqiContext *t = avctx->priv_data;

 
     ff_blockdsp_init(&t->bdsp, avctx);

     ff_bswapdsp_init(&t->bsdsp);

     ff_idctdsp_init(&t->idsp, avctx);
     ff_init_scantable_permutation(t->idsp.idct_permutation, FF_IDCT_PERM_NONE);
     ff_init_scantable(t->idsp.idct_permutation, &t->intra_scantable, ff_zigzag_direct);
 

     avctx->framerate = (AVRational){ 15, 1 };

     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

     ff_mpeg12_init_vlcs();
     return 0;
 }
 

 static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])

 {
     int n;

 
     t->bdsp.clear_blocks(block[0]);

     for (n = 0; n < 6; n++) {

         int ret = ff_mpeg1_decode_block_intra(&t->gb,
                                               t->intra_matrix,
                                               t->intra_scantable.permutated,

                                               t->last_dc, block[n], n, 1);

         if (ret < 0) {
             av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
                    t->mb_x, t->mb_y);

             return -1;

         }

     }

 
     return 0;

 }
 

 static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
                                 int16_t (*block)[64])

 {

     TqiContext *t = avctx->priv_data;

     ptrdiff_t linesize = frame->linesize[0];

     uint8_t *dest_y  = frame->data[0] + t->mb_y * 16 * linesize           + t->mb_x * 16;
     uint8_t *dest_cb = frame->data[1] + t->mb_y *  8 * frame->linesize[1] + t->mb_x *  8;
     uint8_t *dest_cr = frame->data[2] + t->mb_y *  8 * frame->linesize[2] + t->mb_x *  8;

     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);

 
     if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {

         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);

     }
 }
 

 static void tqi_calculate_qtable(TqiContext *t, int quant)

 {

     const int64_t qscale = (215 - 2*quant)*5;

     int i;

 
     t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;

     for(i=1; i<64; i++)

         t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;

 }
 
 static int tqi_decode_frame(AVCodecContext *avctx,

                             void *data, int *got_frame,

                             AVPacket *avpkt)

 {

     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;

     const uint8_t *buf_end = buf+buf_size;
     TqiContext *t = avctx->priv_data;

     AVFrame *frame = data;

     int ret, w, h;

     t->avctx = avctx;
 

     w = AV_RL16(&buf[0]);
     h = AV_RL16(&buf[2]);
     tqi_calculate_qtable(t, buf[4]);

     buf += 8;
 

     ret = ff_set_dimensions(avctx, w, h);

     if (ret < 0)
         return ret;

     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

         return ret;

     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
                           buf_end - buf);

     if (!t->bitstream_buf)

         return AVERROR(ENOMEM);

     t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
                        (buf_end - buf) / 4);

     init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
 
     t->last_dc[0] =
     t->last_dc[1] =
     t->last_dc[2] = 0;
     for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
         for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
             if (tqi_decode_mb(t, t->block) < 0)

                 goto end;

             tqi_idct_put(avctx, frame, t->block);
         }

     }

     end:

     *got_frame = 1;

     return buf_size;
 }
 
 static av_cold int tqi_decode_end(AVCodecContext *avctx)
 {
     TqiContext *t = avctx->priv_data;

     av_freep(&t->bitstream_buf);

     return 0;
 }
 

 AVCodec ff_eatqi_decoder = {

     .name           = "eatqi",

     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_TQI,

     .priv_data_size = sizeof(TqiContext),
     .init           = tqi_decode_init,
     .close          = tqi_decode_end,
     .decode         = tqi_decode_frame,

     .capabilities   = AV_CODEC_CAP_DR1,

 };