libavcodec/eatqi.c

   1 /*
   2  * Electronic Arts TQI Video Decoder
   3  * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 /**
  23  * @file
  24  * Electronic Arts TQI Video Decoder
  25  * @author Peter Ross <pross@xvid.org>
  26  * @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
  27  */
  28
  29 #include "avcodec.h"
  30 #include "blockdsp.h"
  31 #include "bswapdsp.h"
  32 #include "get_bits.h"
  33 #include "aandcttab.h"
  34 #include "eaidct.h"
  35 #include "idctdsp.h"
  36 #include "internal.h"
  37 #include "mpeg12.h"
  38
  39 typedef struct TqiContext {
  40     GetBitContext gb;
  41     BlockDSPContext bdsp;
  42     BswapDSPContext bsdsp;
  43     IDCTDSPContext idsp;
  44     ScanTable intra_scantable;
  45
  46     void *bitstream_buf;
  47     unsigned int bitstream_buf_size;
  48
  49     int mb_x, mb_y;
  50     uint16_t intra_matrix[64];
  51     int last_dc[3];
  52
  53     DECLARE_ALIGNED(16, int16_t, block)[6][64];
  54 } TqiContext;
  55
  56 static av_cold int tqi_decode_init(AVCodecContext *avctx)
  57 {
  58     TqiContext *t = avctx->priv_data;
  59
  60     ff_blockdsp_init(&t->bdsp, avctx);
  61     ff_bswapdsp_init(&t->bsdsp);
  62     ff_idctdsp_init(&t->idsp, avctx);
  63     ff_init_scantable_permutation(t->idsp.idct_permutation, FF_IDCT_PERM_NONE);
  64     ff_init_scantable(t->idsp.idct_permutation, &t->intra_scantable, ff_zigzag_direct);
  65
  66     avctx->framerate = (AVRational){ 15, 1 };
  67     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  68     ff_mpeg12_init_vlcs();
  69     return 0;
  70 }
  71
  72 static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
  73 {
  74     int n;
  75
  76     t->bdsp.clear_blocks(block[0]);
  77     for (n = 0; n < 6; n++) {
  78         int ret = ff_mpeg1_decode_block_intra(&t->gb,
  79                                               t->intra_matrix,
  80                                               t->intra_scantable.permutated,
  81                                               t->last_dc, block[n], n, 1);
  82         if (ret < 0)
  83             return -1;
  84     }
  85
  86     return 0;
  87 }
  88
  89 static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
  90                                 int16_t (*block)[64])
  91 {
  92     TqiContext *t = avctx->priv_data;
  93     int linesize = frame->linesize[0];
  94     uint8_t *dest_y  = frame->data[0] + t->mb_y * 16 * linesize           + t->mb_x * 16;
  95     uint8_t *dest_cb = frame->data[1] + t->mb_y *  8 * frame->linesize[1] + t->mb_x *  8;
  96     uint8_t *dest_cr = frame->data[2] + t->mb_y *  8 * frame->linesize[2] + t->mb_x *  8;
  97
  98     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
  99     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
 100     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
 101     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
 102
 103     if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
 104         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
 105         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
 106     }
 107 }
 108
 109 static void tqi_calculate_qtable(TqiContext *t, int quant)
 110 {
 111     const int qscale = (215 - 2*quant)*5;
 112     int i;
 113
 114     t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
 115     for(i=1; i<64; i++)
 116         t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
 117 }
 118
 119 static int tqi_decode_frame(AVCodecContext *avctx,
 120                             void *data, int *got_frame,
 121                             AVPacket *avpkt)
 122 {
 123     const uint8_t *buf = avpkt->data;
 124     int buf_size = avpkt->size;
 125     const uint8_t *buf_end = buf+buf_size;
 126     TqiContext *t = avctx->priv_data;
 127     AVFrame *frame = data;
 128     int ret, w, h;
 129
 130     w = AV_RL16(&buf[0]);
 131     h = AV_RL16(&buf[2]);
 132     tqi_calculate_qtable(t, buf[4]);
 133     buf += 8;
 134
 135     ret = ff_set_dimensions(avctx, w, h);
 136     if (ret < 0)
 137         return ret;
 138
 139     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
 140         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 141         return ret;
 142     }
 143
 144     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
 145                           buf_end - buf);
 146     if (!t->bitstream_buf)
 147         return AVERROR(ENOMEM);
 148     t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
 149                        (buf_end - buf) / 4);
 150     init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
 151
 152     t->last_dc[0] =
 153     t->last_dc[1] =
 154     t->last_dc[2] = 0;
 155     for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
 156         for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
 157             if (tqi_decode_mb(t, t->block) < 0)
 158                 break;
 159             tqi_idct_put(avctx, frame, t->block);
 160         }
 161     }
 162
 163     *got_frame = 1;
 164     return buf_size;
 165 }
 166
 167 static av_cold int tqi_decode_end(AVCodecContext *avctx)
 168 {
 169     TqiContext *t = avctx->priv_data;
 170     av_free(t->bitstream_buf);
 171     return 0;
 172 }
 173
 174 AVCodec ff_eatqi_decoder = {
 175     .name           = "eatqi",
 176     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
 177     .type           = AVMEDIA_TYPE_VIDEO,
 178     .id             = AV_CODEC_ID_TQI,
 179     .priv_data_size = sizeof(TqiContext),
 180     .init           = tqi_decode_init,
 181     .close          = tqi_decode_end,
 182     .decode         = tqi_decode_frame,
 183     .capabilities   = AV_CODEC_CAP_DR1,
 184 };