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
33static 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
191AVCodec 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
205AVCodec 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};
216