2 * Sunplus JPEG decoder (SP5X)
3 * Copyright (c) 2003 Alex Beregszaszi
5 * This file is part of FFmpeg.
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.
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.
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
23 * @file libavcodec/sp5xdec.c
24 * Sunplus JPEG decoder (SP5X).
33 static int sp5x_decode_frame(AVCodecContext *avctx,
34 void *data, int *data_size,
35 const uint8_t *buf, int buf_size)
38 MJpegDecodeContext *s = avctx->priv_data;
41 const uint8_t *buf_ptr, *buf_end;
45 if (!avctx->width || !avctx->height)
49 buf_end = buf + buf_size;
52 recoded = av_mallocz(buf_size + 1024);
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);
65 memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
66 j += sizeof(sp5x_data_dht);
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);
73 memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
74 j += sizeof(sp5x_data_sos);
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];
80 for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
82 recoded[j++] = buf[i];
91 avctx->flags &= ~CODEC_FLAG_EMU_EDGE;
92 i = ff_mjpeg_decode_frame(avctx, data, data_size, recoded, j);
99 s->width = avctx->coded_width;
100 s->height = avctx->coded_height;
101 s->nb_components = 3;
102 s->component_id[0] = 0;
105 s->quant_index[0] = 0;
106 s->component_id[1] = 1;
109 s->quant_index[1] = 1;
110 s->component_id[2] = 2;
113 s->quant_index[2] = 1;
117 s->qscale_table = av_mallocz((s->width+15)/16);
118 avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
121 s->picture.reference = 0;
122 if (avctx->get_buffer(avctx, &s->picture) < 0)
124 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
128 s->picture.pict_type = FF_I_TYPE;
129 s->picture.key_frame = 1;
131 for (i = 0; i < 3; i++)
132 s->linesize[i] = s->picture.linesize[i] << s->interlaced;
135 for (i = 0; i < 64; i++)
137 j = s->scantable.permutated[i];
138 s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
140 s->qscale[0] = FFMAX(
141 s->quant_matrixes[0][s->scantable.permutated[1]],
142 s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
144 for (i = 0; i < 64; i++)
146 j = s->scantable.permutated[i];
147 s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
149 s->qscale[1] = FFMAX(
150 s->quant_matrixes[1][s->scantable.permutated[1]],
151 s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
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];
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];
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];
177 for (i = 0; i < 3; i++)
178 s->last_dc[i] = 1024;
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);
183 init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
185 return mjpeg_decode_scan(s);
191 AVCodec sp5x_decoder = {
195 sizeof(MJpegDecodeContext),
196 ff_mjpeg_decode_init,
202 .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
205 AVCodec amv_decoder = {
209 sizeof(MJpegDecodeContext),
210 ff_mjpeg_decode_init,
214 .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),