Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / 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 *got_frame,
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 uint8_t *recoded;
42 int i = 0, j = 0;
43
44 if (!avctx->width || !avctx->height)
45 return -1;
46
47 recoded = av_mallocz(buf_size + 1024);
48 if (!recoded)
49 return -1;
50
51 /* SOI */
52 recoded[j++] = 0xFF;
53 recoded[j++] = 0xD8;
54
55 memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
56 memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
57 memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
58 j += sizeof(sp5x_data_dqt);
59
60 memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
61 j += sizeof(sp5x_data_dht);
62
63 memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
64 AV_WB16(recoded+j+5, avctx->coded_height);
65 AV_WB16(recoded+j+7, avctx->coded_width);
66 j += sizeof(sp5x_data_sof);
67
68 memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
69 j += sizeof(sp5x_data_sos);
70
71 if(avctx->codec_id==AV_CODEC_ID_AMV)
72 for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
73 recoded[j++] = buf[i];
74 else
75 for (i = 14; i < buf_size && j < buf_size+1024-3; i++)
76 {
77 recoded[j++] = buf[i];
78 if (buf[i] == 0xff)
79 recoded[j++] = 0;
80 }
81
82 /* EOI */
83 recoded[j++] = 0xFF;
84 recoded[j++] = 0xD9;
85
86 av_init_packet(&avpkt_recoded);
87 avpkt_recoded.data = recoded;
88 avpkt_recoded.size = j;
89 i = ff_mjpeg_decode_frame(avctx, data, got_frame, &avpkt_recoded);
90
91 av_free(recoded);
92
93 return i < 0 ? i : avpkt->size;
94 }
95
96 #if CONFIG_SP5X_DECODER
97 AVCodec ff_sp5x_decoder = {
98 .name = "sp5x",
99 .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
100 .type = AVMEDIA_TYPE_VIDEO,
101 .id = AV_CODEC_ID_SP5X,
102 .priv_data_size = sizeof(MJpegDecodeContext),
103 .init = ff_mjpeg_decode_init,
104 .close = ff_mjpeg_decode_end,
105 .decode = sp5x_decode_frame,
106 .capabilities = CODEC_CAP_DR1,
107 .max_lowres = 3,
108 };
109 #endif
110 #if CONFIG_AMV_DECODER
111 AVCodec ff_amv_decoder = {
112 .name = "amv",
113 .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
114 .type = AVMEDIA_TYPE_VIDEO,
115 .id = AV_CODEC_ID_AMV,
116 .priv_data_size = sizeof(MJpegDecodeContext),
117 .init = ff_mjpeg_decode_init,
118 .close = ff_mjpeg_decode_end,
119 .decode = sp5x_decode_frame,
120 .max_lowres = 3,
121 };
122 #endif