67fbaf462a24650686cc9c4593cc634ad8a24d3e
[libav.git] / 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
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 const int qscale = 5;
41 const uint8_t *buf_ptr;
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
50 recoded = av_mallocz(buf_size + 1024);
51 if (!recoded)
52 return -1;
53
54 /* SOI */
55 recoded[j++] = 0xFF;
56 recoded[j++] = 0xD8;
57
58 memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
59 memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
60 memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
61 j += sizeof(sp5x_data_dqt);
62
63 memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
64 j += sizeof(sp5x_data_dht);
65
66 memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
67 AV_WB16(recoded+j+5, avctx->coded_height);
68 AV_WB16(recoded+j+7, avctx->coded_width);
69 j += sizeof(sp5x_data_sof);
70
71 memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
72 j += sizeof(sp5x_data_sos);
73
74 if(avctx->codec_id==CODEC_ID_AMV)
75 for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
76 recoded[j++] = buf[i];
77 else
78 for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
79 {
80 recoded[j++] = buf[i];
81 if (buf[i] == 0xff)
82 recoded[j++] = 0;
83 }
84
85 /* EOI */
86 recoded[j++] = 0xFF;
87 recoded[j++] = 0xD9;
88
89 avctx->flags &= ~CODEC_FLAG_EMU_EDGE;
90 av_init_packet(&avpkt_recoded);
91 avpkt_recoded.data = recoded;
92 avpkt_recoded.size = j;
93 i = ff_mjpeg_decode_frame(avctx, data, data_size, &avpkt_recoded);
94
95 av_free(recoded);
96
97 return i;
98 }
99
100 AVCodec sp5x_decoder = {
101 "sp5x",
102 AVMEDIA_TYPE_VIDEO,
103 CODEC_ID_SP5X,
104 sizeof(MJpegDecodeContext),
105 ff_mjpeg_decode_init,
106 NULL,
107 ff_mjpeg_decode_end,
108 sp5x_decode_frame,
109 CODEC_CAP_DR1,
110 NULL,
111 .max_lowres = 5,
112 .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
113 };
114
115 AVCodec amv_decoder = {
116 "amv",
117 AVMEDIA_TYPE_VIDEO,
118 CODEC_ID_AMV,
119 sizeof(MJpegDecodeContext),
120 ff_mjpeg_decode_init,
121 NULL,
122 ff_mjpeg_decode_end,
123 sp5x_decode_frame,
124 CODEC_CAP_DR1,
125 .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
126 };