/*
  * 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 "get_bits.h"

 #include "aandcttab.h"

 #include "eaidct.h"

 #include "internal.h"

 #include "mpeg12.h"
 #include "mpegvideo.h"
 
 typedef struct TqiContext {
     MpegEncContext s;

     void *bitstream_buf;

     unsigned int bitstream_buf_size;

     DECLARE_ALIGNED(16, int16_t, 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;

     ff_dsputil_init(&s->dsp, avctx);

     ff_init_scantable_permutation(s->dsp.idct_permutation, FF_NO_IDCT_PERM);

     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 = AV_PIX_FMT_YUV420P;

     ff_mpeg12_init_vlcs();
     return 0;
 }
 

 static int tqi_decode_mb(MpegEncContext *s, int16_t (*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, AVFrame *frame, int16_t (*block)[64])

 {
     MpegEncContext *s = &t->s;

     int linesize = frame->linesize[0];
     uint8_t *dest_y  = frame->data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
     uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
     uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->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(!(s->avctx->flags&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(MpegEncContext *s, int quant)
 {
     const int qscale = (215 - 2*quant)*5;
     int i;

     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;

 }
 
 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;
     MpegEncContext *s = &t->s;

     AVFrame *frame = data;
     int ret;

 
     s->width  = AV_RL16(&buf[0]);
     s->height = AV_RL16(&buf[2]);
     tqi_calculate_qtable(s, buf[4]);
     buf += 8;
 

     ret = ff_set_dimensions(s->avctx, s->width, s->height);
     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);

     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)

             goto end;

         tqi_idct_put(t, 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_free(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   = CODEC_CAP_DR1,

 };