Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 |