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 "internal.h"
29 #include "mjpeg.h"
30 #include "mjpegdec.h"
31 #include "sp5x.h"
32
33
sp5x_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)34 static int sp5x_decode_frame(AVCodecContext *avctx,
35 void *data, int *got_frame,
36 AVPacket *avpkt)
37 {
38 const uint8_t *buf = avpkt->data;
39 int buf_size = avpkt->size;
40 AVPacket avpkt_recoded;
41 const int qscale = 5;
42 uint8_t *recoded;
43 int i = 0, j = 0;
44
45 if (!avctx->width || !avctx->height)
46 return -1;
47
48 recoded = av_mallocz(buf_size + 1024);
49 if (!recoded)
50 return -1;
51
52 /* SOI */
53 recoded[j++] = 0xFF;
54 recoded[j++] = 0xD8;
55
56 memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
57 memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
58 memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
59 j += sizeof(sp5x_data_dqt);
60
61 memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
62 j += sizeof(sp5x_data_dht);
63
64 memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
65 AV_WB16(recoded+j+5, avctx->coded_height);
66 AV_WB16(recoded+j+7, avctx->coded_width);
67 j += sizeof(sp5x_data_sof);
68
69 memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
70 j += sizeof(sp5x_data_sos);
71
72 if(avctx->codec_id==AV_CODEC_ID_AMV)
73 for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
74 recoded[j++] = buf[i];
75 else
76 for (i = 14; i < buf_size && j < buf_size+1024-3; i++)
77 {
78 recoded[j++] = buf[i];
79 if (buf[i] == 0xff)
80 recoded[j++] = 0;
81 }
82
83 /* EOI */
84 recoded[j++] = 0xFF;
85 recoded[j++] = 0xD9;
86
87 av_init_packet(&avpkt_recoded);
88 avpkt_recoded.data = recoded;
89 avpkt_recoded.size = j;
90 i = ff_mjpeg_decode_frame(avctx, data, got_frame, &avpkt_recoded);
91
92 av_free(recoded);
93
94 return i < 0 ? i : avpkt->size;
95 }
96
97 #if CONFIG_SP5X_DECODER
98 AVCodec ff_sp5x_decoder = {
99 .name = "sp5x",
100 .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
101 .type = AVMEDIA_TYPE_VIDEO,
102 .id = AV_CODEC_ID_SP5X,
103 .priv_data_size = sizeof(MJpegDecodeContext),
104 .init = ff_mjpeg_decode_init,
105 .close = ff_mjpeg_decode_end,
106 .decode = sp5x_decode_frame,
107 .capabilities = AV_CODEC_CAP_DR1,
108 .max_lowres = 3,
109 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
110 };
111 #endif
112 #if CONFIG_AMV_DECODER
113 AVCodec ff_amv_decoder = {
114 .name = "amv",
115 .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
116 .type = AVMEDIA_TYPE_VIDEO,
117 .id = AV_CODEC_ID_AMV,
118 .priv_data_size = sizeof(MJpegDecodeContext),
119 .init = ff_mjpeg_decode_init,
120 .close = ff_mjpeg_decode_end,
121 .decode = sp5x_decode_frame,
122 .max_lowres = 3,
123 .capabilities = AV_CODEC_CAP_DR1,
124 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
125 };
126 #endif
127