/*
  * 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
  * by Peter Ross <pross@xvid.org>
  *
  * Technical details here:
  * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
  */
 
 #include "avcodec.h"

 #include "get_bits.h"

 #include "dsputil.h"
 #include "aandcttab.h"
 #include "mpeg12.h"
 #include "mpegvideo.h"
 
 typedef struct TqiContext {
     MpegEncContext s;
     AVFrame frame;

     void *bitstream_buf;

     unsigned int bitstream_buf_size;

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

 } TqiContext;
 
 static av_cold int tqi_decode_init(AVCodecContext *avctx)
 {
     TqiContext *t = avctx->priv_data;
     MpegEncContext *s = &t->s;
     s->avctx = avctx;
     if(avctx->idct_algo==FF_IDCT_AUTO)
         avctx->idct_algo=FF_IDCT_EA;
     dsputil_init(&s->dsp, avctx);
     ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
     s->qscale = 1;
     avctx->time_base = (AVRational){1, 15};
     avctx->pix_fmt = PIX_FMT_YUV420P;
     ff_mpeg12_init_vlcs();
     return 0;
 }
 
 static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
 {
     int n;

     s->dsp.clear_blocks(block[0]);

     for (n=0; n<6; n++)
         ff_mpeg1_decode_block_intra(s, block[n], n);
 }
 
 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
 {
     MpegEncContext *s = &t->s;
     int linesize= t->frame.linesize[0];
     uint8_t *dest_y  = t->frame.data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
     uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
     uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
 
     s->dsp.idct_put(dest_y                 , linesize, block[0]);
     s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
     s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
     s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
     if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
         s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
         s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
     }
 }
 
 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
 {
     const int qscale = (215 - 2*quant)*5;
     int i;
     if (s->avctx->idct_algo==FF_IDCT_EA) {
         s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
         for(i=1; i<64; i++)
             s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
     }else{
         s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
         for(i=1; i<64; i++)
             s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
     }
 }
 
 static int tqi_decode_frame(AVCodecContext *avctx,
                             void *data, int *data_size,

                             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;
     MpegEncContext *s = &t->s;
 
     s->width  = AV_RL16(&buf[0]);
     s->height = AV_RL16(&buf[2]);
     tqi_calculate_qtable(s, buf[4]);
     buf += 8;
 
     if (t->frame.data[0])
         avctx->release_buffer(avctx, &t->frame);
 
     if (s->avctx->width!=s->width || s->avctx->height!=s->height)
         avcodec_set_dimensions(s->avctx, s->width, s->height);
 
     if(avctx->get_buffer(avctx, &t->frame) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
 

     av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);

     if (!t->bitstream_buf)

         return AVERROR(ENOMEM);

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

     init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
 
     s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
     for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
     for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
     {

         tqi_decode_mb(s, t->block);
         tqi_idct_put(t, t->block);

     }
 
     *data_size = sizeof(AVFrame);
     *(AVFrame*)data = t->frame;
     return buf_size;
 }
 
 static av_cold int tqi_decode_end(AVCodecContext *avctx)
 {
     TqiContext *t = avctx->priv_data;
     if(t->frame.data[0])
         avctx->release_buffer(avctx, &t->frame);
     av_free(t->bitstream_buf);
     return 0;
 }
 

 AVCodec ff_eatqi_decoder = {

     "eatqi",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_TQI,
     sizeof(TqiContext),
     tqi_decode_init,
     NULL,
     tqi_decode_end,
     tqi_decode_frame,
     CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
 };