ffmpeg/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 FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 #include "mpegvideo.h"
  39
  40 typedef struct TqiContext {
  41     MpegEncContext s;
  42     BswapDSPContext bsdsp;
  43     void *bitstream_buf;
  44     unsigned int bitstream_buf_size;
  45     DECLARE_ALIGNED(16, int16_t, block)[6][64];
  46 } TqiContext;
  47
  48 static av_cold int tqi_decode_init(AVCodecContext *avctx)
  49 {
  50     TqiContext *t = avctx->priv_data;
  51     MpegEncContext *s = &t->s;
  52     s->avctx = avctx;
  53     ff_blockdsp_init(&s->bdsp, avctx);
  54     ff_bswapdsp_init(&t->bsdsp);
  55     ff_idctdsp_init(&s->idsp, avctx);
  56     ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
  57     ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
  58     s->qscale = 1;
  59     avctx->framerate = (AVRational){ 15, 1 };
  60     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  61     ff_mpeg12_init_vlcs();
  62     return 0;
  63 }
  64
  65 static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
  66 {
  67     int n;
  68     s->bdsp.clear_blocks(block[0]);
  69     for (n=0; n<6; n++)
  70         if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
  71             return -1;
  72
  73     return 0;
  74 }
  75
  76 static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
  77 {
  78     MpegEncContext *s = &t->s;
  79     int linesize = frame->linesize[0];
  80     uint8_t *dest_y  = frame->data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
  81     uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
  82     uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
  83
  84     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
  85     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
  86     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
  87     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
  88     if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
  89         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
  90         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
  91     }
  92 }
  93
  94 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
  95 {
  96     const int qscale = (215 - 2*quant)*5;
  97     int i;
  98     s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
  99     for(i=1; i<64; i++)
 100         s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
 101 }
 102
 103 static int tqi_decode_frame(AVCodecContext *avctx,
 104                             void *data, int *got_frame,
 105                             AVPacket *avpkt)
 106 {
 107     const uint8_t *buf = avpkt->data;
 108     int buf_size = avpkt->size;
 109     const uint8_t *buf_end = buf+buf_size;
 110     TqiContext *t = avctx->priv_data;
 111     MpegEncContext *s = &t->s;
 112     AVFrame *frame = data;
 113     int ret;
 114
 115     s->width  = AV_RL16(&buf[0]);
 116     s->height = AV_RL16(&buf[2]);
 117     tqi_calculate_qtable(s, buf[4]);
 118     buf += 8;
 119
 120     ret = ff_set_dimensions(s->avctx, s->width, s->height);
 121     if (ret < 0)
 122         return ret;
 123
 124     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
 125         return ret;
 126
 127     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
 128                           buf_end - buf);
 129     if (!t->bitstream_buf)
 130         return AVERROR(ENOMEM);
 131     t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
 132                        (buf_end - buf) / 4);
 133     init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
 134
 135     s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
 136     for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
 137     for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
 138     {
 139         if (tqi_decode_mb(s, t->block) < 0)
 140             goto end;
 141         tqi_idct_put(t, frame, t->block);
 142     }
 143     end:
 144
 145     *got_frame = 1;
 146     return buf_size;
 147 }
 148
 149 static av_cold int tqi_decode_end(AVCodecContext *avctx)
 150 {
 151     TqiContext *t = avctx->priv_data;
 152     av_freep(&t->bitstream_buf);
 153     return 0;
 154 }
 155
 156 AVCodec ff_eatqi_decoder = {
 157     .name           = "eatqi",
 158     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
 159     .type           = AVMEDIA_TYPE_VIDEO,
 160     .id             = AV_CODEC_ID_TQI,
 161     .priv_data_size = sizeof(TqiContext),
 162     .init           = tqi_decode_init,
 163     .close          = tqi_decode_end,
 164     .decode         = tqi_decode_frame,
 165     .capabilities   = CODEC_CAP_DR1,
 166 };