libavcodec/sp5xdec.c

   1 /*
   2  * Sunplus JPEG decoder (SP5X)
   3  * Copyright (c) 2003 Alex Beregszaszi
   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 Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file sp5xdec.c
  24  * Sunplus JPEG decoder (SP5X).
  25  */
  26
  27 #include "avcodec.h"
  28 #include "mjpeg.h"
  29 #include "mjpegdec.h"
  30 #include "sp5x.h"
  31
  32
  33 static int sp5x_decode_frame(AVCodecContext *avctx,
  34                               void *data, int *data_size,
  35                               const uint8_t *buf, int buf_size)
  36 {
  37 #if 0
  38     MJpegDecodeContext *s = avctx->priv_data;
  39 #endif
  40     const int qscale = 5;
  41     const uint8_t *buf_ptr, *buf_end;
  42     uint8_t *recoded;
  43     int i = 0, j = 0;
  44
  45     if (!avctx->width || !avctx->height)
  46         return -1;
  47
  48     buf_ptr = buf;
  49     buf_end = buf + buf_size;
  50
  51 #if 1
  52     recoded = av_mallocz(buf_size + 1024);
  53     if (!recoded)
  54         return -1;
  55
  56     /* SOI */
  57     recoded[j++] = 0xFF;
  58     recoded[j++] = 0xD8;
  59
  60     memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
  61     memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
  62     memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
  63     j += sizeof(sp5x_data_dqt);
  64
  65     memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
  66     j += sizeof(sp5x_data_dht);
  67
  68     memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
  69     AV_WB16(recoded+j+5, avctx->coded_height);
  70     AV_WB16(recoded+j+7, avctx->coded_width);
  71     j += sizeof(sp5x_data_sof);
  72
  73     memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
  74     j += sizeof(sp5x_data_sos);
  75
  76     if(avctx->codec_id==CODEC_ID_AMV)
  77         for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
  78             recoded[j++] = buf[i];
  79     else
  80     for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
  81     {
  82         recoded[j++] = buf[i];
  83         if (buf[i] == 0xff)
  84             recoded[j++] = 0;
  85     }
  86
  87     /* EOI */
  88     recoded[j++] = 0xFF;
  89     recoded[j++] = 0xD9;
  90
  91     avctx->flags &= ~CODEC_FLAG_EMU_EDGE;
  92     i = ff_mjpeg_decode_frame(avctx, data, data_size, recoded, j);
  93
  94     av_free(recoded);
  95
  96 #else
  97     /* SOF */
  98     s->bits = 8;
  99     s->width  = avctx->coded_width;
 100     s->height = avctx->coded_height;
 101     s->nb_components = 3;
 102     s->component_id[0] = 0;
 103     s->h_count[0] = 2;
 104     s->v_count[0] = 2;
 105     s->quant_index[0] = 0;
 106     s->component_id[1] = 1;
 107     s->h_count[1] = 1;
 108     s->v_count[1] = 1;
 109     s->quant_index[1] = 1;
 110     s->component_id[2] = 2;
 111     s->h_count[2] = 1;
 112     s->v_count[2] = 1;
 113     s->quant_index[2] = 1;
 114     s->h_max = 2;
 115     s->v_max = 2;
 116
 117     s->qscale_table = av_mallocz((s->width+15)/16);
 118     avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
 119     s->interlaced = 0;
 120
 121     s->picture.reference = 0;
 122     if (avctx->get_buffer(avctx, &s->picture) < 0)
 123     {
 124         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 125         return -1;
 126     }
 127
 128     s->picture.pict_type = FF_I_TYPE;
 129     s->picture.key_frame = 1;
 130
 131     for (i = 0; i < 3; i++)
 132         s->linesize[i] = s->picture.linesize[i] << s->interlaced;
 133
 134     /* DQT */
 135     for (i = 0; i < 64; i++)
 136     {
 137         j = s->scantable.permutated[i];
 138         s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
 139     }
 140     s->qscale[0] = FFMAX(
 141         s->quant_matrixes[0][s->scantable.permutated[1]],
 142         s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
 143
 144     for (i = 0; i < 64; i++)
 145     {
 146         j = s->scantable.permutated[i];
 147         s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
 148     }
 149     s->qscale[1] = FFMAX(
 150         s->quant_matrixes[1][s->scantable.permutated[1]],
 151         s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
 152
 153     /* DHT */
 154
 155     /* SOS */
 156     s->comp_index[0] = 0;
 157     s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
 158     s->h_scount[0] = s->h_count[0];
 159     s->v_scount[0] = s->v_count[0];
 160     s->dc_index[0] = 0;
 161     s->ac_index[0] = 0;
 162
 163     s->comp_index[1] = 1;
 164     s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
 165     s->h_scount[1] = s->h_count[1];
 166     s->v_scount[1] = s->v_count[1];
 167     s->dc_index[1] = 1;
 168     s->ac_index[1] = 1;
 169
 170     s->comp_index[2] = 2;
 171     s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
 172     s->h_scount[2] = s->h_count[2];
 173     s->v_scount[2] = s->v_count[2];
 174     s->dc_index[2] = 1;
 175     s->ac_index[2] = 1;
 176
 177     for (i = 0; i < 3; i++)
 178         s->last_dc[i] = 1024;
 179
 180     s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
 181     s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
 182
 183     init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
 184
 185     return mjpeg_decode_scan(s);
 186 #endif
 187
 188     return i;
 189 }
 190
 191 AVCodec sp5x_decoder = {
 192     "sp5x",
 193     CODEC_TYPE_VIDEO,
 194     CODEC_ID_SP5X,
 195     sizeof(MJpegDecodeContext),
 196     ff_mjpeg_decode_init,
 197     NULL,
 198     ff_mjpeg_decode_end,
 199     sp5x_decode_frame,
 200     CODEC_CAP_DR1,
 201     NULL,
 202     .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
 203 };
 204
 205 AVCodec amv_decoder = {
 206     "amv",
 207     CODEC_TYPE_VIDEO,
 208     CODEC_ID_AMV,
 209     sizeof(MJpegDecodeContext),
 210     ff_mjpeg_decode_init,
 211     NULL,
 212     ff_mjpeg_decode_end,
 213     sp5x_decode_frame,
 214     .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
 215 };