text: /*
   * Electronic Arts TQI Video Decoder
   * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
   *
   * This file is part of Libav.
   *
   * Libav 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.
   *
   * Libav 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 Libav; 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 "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 int tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
  {
      int n;
      s->dsp.clear_blocks(block[0]);
      for (n=0; n<6; n++)
          if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
              return -1;
  
      return 0;
  }
  
  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++)
      {
          if (tqi_decode_mb(s, t->block) < 0)
              break;
          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 = {
      .name           = "eatqi",
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = CODEC_ID_TQI,
      .priv_data_size = sizeof(TqiContext),
      .init           = tqi_decode_init,
      .close          = tqi_decode_end,
      .decode         = tqi_decode_frame,
      .capabilities   = CODEC_CAP_DR1,
      .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
  };
  