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libavcodec/sp5xdec.c

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00001 /*
00002  * Sunplus JPEG decoder (SP5X)
00003  * Copyright (c) 2003 Alex Beregszaszi
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "avcodec.h"
00028 #include "mjpeg.h"
00029 #include "mjpegdec.h"
00030 #include "sp5x.h"
00031 
00032 
00033 static int sp5x_decode_frame(AVCodecContext *avctx,
00034                               void *data, int *data_size,
00035                               AVPacket *avpkt)
00036 {
00037     const uint8_t *buf = avpkt->data;
00038     int buf_size = avpkt->size;
00039     AVPacket avpkt_recoded;
00040 #if 0
00041     MJpegDecodeContext *s = avctx->priv_data;
00042 #endif
00043     const int qscale = 5;
00044     const uint8_t *buf_ptr;
00045     uint8_t *recoded;
00046     int i = 0, j = 0;
00047 
00048     if (!avctx->width || !avctx->height)
00049         return -1;
00050 
00051     buf_ptr = buf;
00052 
00053 #if 1
00054     recoded = av_mallocz(buf_size + 1024);
00055     if (!recoded)
00056         return -1;
00057 
00058     /* SOI */
00059     recoded[j++] = 0xFF;
00060     recoded[j++] = 0xD8;
00061 
00062     memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
00063     memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
00064     memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
00065     j += sizeof(sp5x_data_dqt);
00066 
00067     memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
00068     j += sizeof(sp5x_data_dht);
00069 
00070     memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
00071     AV_WB16(recoded+j+5, avctx->coded_height);
00072     AV_WB16(recoded+j+7, avctx->coded_width);
00073     j += sizeof(sp5x_data_sof);
00074 
00075     memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
00076     j += sizeof(sp5x_data_sos);
00077 
00078     if(avctx->codec_id==CODEC_ID_AMV)
00079         for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
00080             recoded[j++] = buf[i];
00081     else
00082     for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
00083     {
00084         recoded[j++] = buf[i];
00085         if (buf[i] == 0xff)
00086             recoded[j++] = 0;
00087     }
00088 
00089     /* EOI */
00090     recoded[j++] = 0xFF;
00091     recoded[j++] = 0xD9;
00092 
00093     av_init_packet(&avpkt_recoded);
00094     avpkt_recoded.data = recoded;
00095     avpkt_recoded.size = j;
00096     i = ff_mjpeg_decode_frame(avctx, data, data_size, &avpkt_recoded);
00097 
00098     av_free(recoded);
00099 
00100 #else
00101     /* SOF */
00102     s->bits = 8;
00103     s->width  = avctx->coded_width;
00104     s->height = avctx->coded_height;
00105     s->nb_components = 3;
00106     s->component_id[0] = 0;
00107     s->h_count[0] = 2;
00108     s->v_count[0] = 2;
00109     s->quant_index[0] = 0;
00110     s->component_id[1] = 1;
00111     s->h_count[1] = 1;
00112     s->v_count[1] = 1;
00113     s->quant_index[1] = 1;
00114     s->component_id[2] = 2;
00115     s->h_count[2] = 1;
00116     s->v_count[2] = 1;
00117     s->quant_index[2] = 1;
00118     s->h_max = 2;
00119     s->v_max = 2;
00120 
00121     s->qscale_table = av_mallocz((s->width+15)/16);
00122     avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
00123     s->interlaced = 0;
00124 
00125     s->picture.reference = 0;
00126     if (avctx->get_buffer(avctx, &s->picture) < 0)
00127     {
00128         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00129         return -1;
00130     }
00131 
00132     s->picture.pict_type = FF_I_TYPE;
00133     s->picture.key_frame = 1;
00134 
00135     for (i = 0; i < 3; i++)
00136         s->linesize[i] = s->picture.linesize[i] << s->interlaced;
00137 
00138     /* DQT */
00139     for (i = 0; i < 64; i++)
00140     {
00141         j = s->scantable.permutated[i];
00142         s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
00143     }
00144     s->qscale[0] = FFMAX(
00145         s->quant_matrixes[0][s->scantable.permutated[1]],
00146         s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
00147 
00148     for (i = 0; i < 64; i++)
00149     {
00150         j = s->scantable.permutated[i];
00151         s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
00152     }
00153     s->qscale[1] = FFMAX(
00154         s->quant_matrixes[1][s->scantable.permutated[1]],
00155         s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
00156 
00157     /* DHT */
00158 
00159     /* SOS */
00160     s->comp_index[0] = 0;
00161     s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
00162     s->h_scount[0] = s->h_count[0];
00163     s->v_scount[0] = s->v_count[0];
00164     s->dc_index[0] = 0;
00165     s->ac_index[0] = 0;
00166 
00167     s->comp_index[1] = 1;
00168     s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
00169     s->h_scount[1] = s->h_count[1];
00170     s->v_scount[1] = s->v_count[1];
00171     s->dc_index[1] = 1;
00172     s->ac_index[1] = 1;
00173 
00174     s->comp_index[2] = 2;
00175     s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
00176     s->h_scount[2] = s->h_count[2];
00177     s->v_scount[2] = s->v_count[2];
00178     s->dc_index[2] = 1;
00179     s->ac_index[2] = 1;
00180 
00181     for (i = 0; i < 3; i++)
00182         s->last_dc[i] = 1024;
00183 
00184     s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
00185     s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
00186 
00187     init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
00188 
00189     return mjpeg_decode_scan(s);
00190 #endif
00191 
00192     return i;
00193 }
00194 
00195 AVCodec sp5x_decoder = {
00196     "sp5x",
00197     AVMEDIA_TYPE_VIDEO,
00198     CODEC_ID_SP5X,
00199     sizeof(MJpegDecodeContext),
00200     ff_mjpeg_decode_init,
00201     NULL,
00202     ff_mjpeg_decode_end,
00203     sp5x_decode_frame,
00204     CODEC_CAP_DR1,
00205     NULL,
00206     .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
00207 };
00208 
00209 AVCodec amv_decoder = {
00210     "amv",
00211     AVMEDIA_TYPE_VIDEO,
00212     CODEC_ID_AMV,
00213     sizeof(MJpegDecodeContext),
00214     ff_mjpeg_decode_init,
00215     NULL,
00216     ff_mjpeg_decode_end,
00217     sp5x_decode_frame,
00218     0,
00219     .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
00220 };

Generated on Fri Sep 16 2011 17:17:43 for FFmpeg by  doxygen 1.7.1