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 libavcodec/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                               AVPacket *avpkt)
  36 {
  37     const uint8_t *buf = avpkt->data;
  38     int buf_size = avpkt->size;
  39     AVPacket avpkt_recoded;
  40 #if 0
  41     MJpegDecodeContext *s = avctx->priv_data;
  42 #endif
  43     const int qscale = 5;
  44     const uint8_t *buf_ptr;
  45     uint8_t *recoded;
  46     int i = 0, j = 0;
  47
  48     if (!avctx->width || !avctx->height)
  49         return -1;
  50
  51     buf_ptr = buf;
  52
  53 #if 1
  54     recoded = av_mallocz(buf_size + 1024);
  55     if (!recoded)
  56         return -1;
  57
  58     /* SOI */
  59     recoded[j++] = 0xFF;
  60     recoded[j++] = 0xD8;
  61
  62     memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
  63     memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
  64     memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
  65     j += sizeof(sp5x_data_dqt);
  66
  67     memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
  68     j += sizeof(sp5x_data_dht);
  69
  70     memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
  71     AV_WB16(recoded+j+5, avctx->coded_height);
  72     AV_WB16(recoded+j+7, avctx->coded_width);
  73     j += sizeof(sp5x_data_sof);
  74
  75     memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
  76     j += sizeof(sp5x_data_sos);
  77
  78     if(avctx->codec_id==CODEC_ID_AMV)
  79         for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
  80             recoded[j++] = buf[i];
  81     else
  82     for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
  83     {
  84         recoded[j++] = buf[i];
  85         if (buf[i] == 0xff)
  86             recoded[j++] = 0;
  87     }
  88
  89     /* EOI */
  90     recoded[j++] = 0xFF;
  91     recoded[j++] = 0xD9;
  92
  93     avctx->flags &= ~CODEC_FLAG_EMU_EDGE;
  94     av_init_packet(&avpkt_recoded);
  95     avpkt_recoded.data = recoded;
  96     avpkt_recoded.size = j;
  97     i = ff_mjpeg_decode_frame(avctx, data, data_size, &avpkt_recoded);
  98
  99     av_free(recoded);
 100
 101 #else
 102     /* SOF */
 103     s->bits = 8;
 104     s->width  = avctx->coded_width;
 105     s->height = avctx->coded_height;
 106     s->nb_components = 3;
 107     s->component_id[0] = 0;
 108     s->h_count[0] = 2;
 109     s->v_count[0] = 2;
 110     s->quant_index[0] = 0;
 111     s->component_id[1] = 1;
 112     s->h_count[1] = 1;
 113     s->v_count[1] = 1;
 114     s->quant_index[1] = 1;
 115     s->component_id[2] = 2;
 116     s->h_count[2] = 1;
 117     s->v_count[2] = 1;
 118     s->quant_index[2] = 1;
 119     s->h_max = 2;
 120     s->v_max = 2;
 121
 122     s->qscale_table = av_mallocz((s->width+15)/16);
 123     avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
 124     s->interlaced = 0;
 125
 126     s->picture.reference = 0;
 127     if (avctx->get_buffer(avctx, &s->picture) < 0)
 128     {
 129         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 130         return -1;
 131     }
 132
 133     s->picture.pict_type = FF_I_TYPE;
 134     s->picture.key_frame = 1;
 135
 136     for (i = 0; i < 3; i++)
 137         s->linesize[i] = s->picture.linesize[i] << s->interlaced;
 138
 139     /* DQT */
 140     for (i = 0; i < 64; i++)
 141     {
 142         j = s->scantable.permutated[i];
 143         s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
 144     }
 145     s->qscale[0] = FFMAX(
 146         s->quant_matrixes[0][s->scantable.permutated[1]],
 147         s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
 148
 149     for (i = 0; i < 64; i++)
 150     {
 151         j = s->scantable.permutated[i];
 152         s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
 153     }
 154     s->qscale[1] = FFMAX(
 155         s->quant_matrixes[1][s->scantable.permutated[1]],
 156         s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
 157
 158     /* DHT */
 159
 160     /* SOS */
 161     s->comp_index[0] = 0;
 162     s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
 163     s->h_scount[0] = s->h_count[0];
 164     s->v_scount[0] = s->v_count[0];
 165     s->dc_index[0] = 0;
 166     s->ac_index[0] = 0;
 167
 168     s->comp_index[1] = 1;
 169     s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
 170     s->h_scount[1] = s->h_count[1];
 171     s->v_scount[1] = s->v_count[1];
 172     s->dc_index[1] = 1;
 173     s->ac_index[1] = 1;
 174
 175     s->comp_index[2] = 2;
 176     s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
 177     s->h_scount[2] = s->h_count[2];
 178     s->v_scount[2] = s->v_count[2];
 179     s->dc_index[2] = 1;
 180     s->ac_index[2] = 1;
 181
 182     for (i = 0; i < 3; i++)
 183         s->last_dc[i] = 1024;
 184
 185     s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
 186     s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
 187
 188     init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
 189
 190     return mjpeg_decode_scan(s);
 191 #endif
 192
 193     return i;
 194 }
 195
 196 AVCodec sp5x_decoder = {
 197     "sp5x",
 198     CODEC_TYPE_VIDEO,
 199     CODEC_ID_SP5X,
 200     sizeof(MJpegDecodeContext),
 201     ff_mjpeg_decode_init,
 202     NULL,
 203     ff_mjpeg_decode_end,
 204     sp5x_decode_frame,
 205     CODEC_CAP_DR1,
 206     NULL,
 207     .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
 208 };
 209
 210 AVCodec amv_decoder = {
 211     "amv",
 212     CODEC_TYPE_VIDEO,
 213     CODEC_ID_AMV,
 214     sizeof(MJpegDecodeContext),
 215     ff_mjpeg_decode_init,
 216     NULL,
 217     ff_mjpeg_decode_end,
 218     sp5x_decode_frame,
 219     CODEC_CAP_DR1,
 220     .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
 221 };