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 "get_bits.h"
  31 #include "dsputil.h"
  32 #include "aandcttab.h"
  33 #include "eaidct.h"
  34 #include "internal.h"
  35 #include "mpeg12.h"
  36 #include "mpegvideo.h"
  37
  38 typedef struct TqiContext {
  39     MpegEncContext s;
  40     AVFrame frame;
  41     void *bitstream_buf;
  42     unsigned int bitstream_buf_size;
  43     DECLARE_ALIGNED(16, int16_t, block)[6][64];
  44 } TqiContext;
  45
  46 static av_cold int tqi_decode_init(AVCodecContext *avctx)
  47 {
  48     TqiContext *t = avctx->priv_data;
  49     MpegEncContext *s = &t->s;
  50     s->avctx = avctx;
  51     ff_dsputil_init(&s->dsp, avctx);
  52     ff_init_scantable_permutation(s->dsp.idct_permutation, FF_NO_IDCT_PERM);
  53     ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
  54     s->qscale = 1;
  55     avctx->time_base = (AVRational){1, 15};
  56     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  57     ff_mpeg12_init_vlcs();
  58     return 0;
  59 }
  60
  61 static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
  62 {
  63     int n;
  64     s->dsp.clear_blocks(block[0]);
  65     for (n=0; n<6; n++)
  66         if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
  67             return -1;
  68
  69     return 0;
  70 }
  71
  72 static inline void tqi_idct_put(TqiContext *t, int16_t (*block)[64])
  73 {
  74     MpegEncContext *s = &t->s;
  75     int linesize= t->frame.linesize[0];
  76     uint8_t *dest_y  = t->frame.data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
  77     uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
  78     uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
  79
  80     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
  81     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
  82     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
  83     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
  84     if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
  85         ff_ea_idct_put_c(dest_cb, t->frame.linesize[1], block[4]);
  86         ff_ea_idct_put_c(dest_cr, t->frame.linesize[2], block[5]);
  87     }
  88 }
  89
  90 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
  91 {
  92     const int qscale = (215 - 2*quant)*5;
  93     int i;
  94     s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
  95     for(i=1; i<64; i++)
  96         s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
  97 }
  98
  99 static int tqi_decode_frame(AVCodecContext *avctx,
 100                             void *data, int *got_frame,
 101                             AVPacket *avpkt)
 102 {
 103     const uint8_t *buf = avpkt->data;
 104     int buf_size = avpkt->size;
 105     const uint8_t *buf_end = buf+buf_size;
 106     TqiContext *t = avctx->priv_data;
 107     MpegEncContext *s = &t->s;
 108
 109     s->width  = AV_RL16(&buf[0]);
 110     s->height = AV_RL16(&buf[2]);
 111     tqi_calculate_qtable(s, buf[4]);
 112     buf += 8;
 113
 114     if (t->frame.data[0])
 115         avctx->release_buffer(avctx, &t->frame);
 116
 117     if (s->avctx->width!=s->width || s->avctx->height!=s->height)
 118         avcodec_set_dimensions(s->avctx, s->width, s->height);
 119
 120     if(ff_get_buffer(avctx, &t->frame) < 0) {
 121         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 122         return -1;
 123     }
 124
 125     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
 126                           buf_end - buf);
 127     if (!t->bitstream_buf)
 128         return AVERROR(ENOMEM);
 129     s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
 130     init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
 131
 132     s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
 133     for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
 134     for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
 135     {
 136         if (tqi_decode_mb(s, t->block) < 0)
 137             break;
 138         tqi_idct_put(t, t->block);
 139     }
 140
 141     *got_frame = 1;
 142     *(AVFrame*)data = t->frame;
 143     return buf_size;
 144 }
 145
 146 static av_cold int tqi_decode_end(AVCodecContext *avctx)
 147 {
 148     TqiContext *t = avctx->priv_data;
 149     if(t->frame.data[0])
 150         avctx->release_buffer(avctx, &t->frame);
 151     av_free(t->bitstream_buf);
 152     return 0;
 153 }
 154
 155 AVCodec ff_eatqi_decoder = {
 156     .name           = "eatqi",
 157     .type           = AVMEDIA_TYPE_VIDEO,
 158     .id             = AV_CODEC_ID_TQI,
 159     .priv_data_size = sizeof(TqiContext),
 160     .init           = tqi_decode_init,
 161     .close          = tqi_decode_end,
 162     .decode         = tqi_decode_frame,
 163     .capabilities   = CODEC_CAP_DR1,
 164     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
 165 };