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 "config_components.h"
28
29 #include "avcodec.h"
30 #include "codec_internal.h"
31 #include "mjpeg.h"
32 #include "mjpegdec.h"
33 #include "sp5x.h"
34
ff_sp5x_process_packet(AVCodecContext *avctx, AVPacket *avpkt)35 int ff_sp5x_process_packet(AVCodecContext *avctx, AVPacket *avpkt)
36 {
37 const uint8_t *buf = avpkt->data;
38 int buf_size = avpkt->size;
39 AVBufferRef *buf_recoded;
40 uint8_t *recoded;
41 int i = 0, j = 0;
42
43 if (!avctx->width || !avctx->height)
44 return -1;
45
46 buf_recoded = av_buffer_allocz(buf_size + 1024);
47 if (!buf_recoded)
48 return -1;
49 recoded = buf_recoded->data;
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_qscale_five_quant_table[0], 64);
57 memcpy(recoded + j + 70, &sp5x_qscale_five_quant_table[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_buffer_unref(&avpkt->buf);
87 avpkt->buf = buf_recoded;
88 avpkt->data = recoded;
89 avpkt->size = j;
90
91 return 0;
92 }
93
94 #if CONFIG_SP5X_DECODER
95 const FFCodec ff_sp5x_decoder = {
96 .p.name = "sp5x",
97 .p.long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
98 .p.type = AVMEDIA_TYPE_VIDEO,
99 .p.id = AV_CODEC_ID_SP5X,
100 .priv_data_size = sizeof(MJpegDecodeContext),
101 .init = ff_mjpeg_decode_init,
102 .close = ff_mjpeg_decode_end,
103 FF_CODEC_RECEIVE_FRAME_CB(ff_mjpeg_receive_frame),
104 .p.capabilities = AV_CODEC_CAP_DR1,
105 .p.max_lowres = 3,
106 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
107 FF_CODEC_CAP_SETS_PKT_DTS,
108 };
109 #endif
110 #if CONFIG_AMV_DECODER
111 const FFCodec ff_amv_decoder = {
112 .p.name = "amv",
113 .p.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
114 .p.type = AVMEDIA_TYPE_VIDEO,
115 .p.id = AV_CODEC_ID_AMV,
116 .priv_data_size = sizeof(MJpegDecodeContext),
117 .init = ff_mjpeg_decode_init,
118 .close = ff_mjpeg_decode_end,
119 FF_CODEC_RECEIVE_FRAME_CB(ff_mjpeg_receive_frame),
120 .p.max_lowres = 3,
121 .p.capabilities = AV_CODEC_CAP_DR1,
122 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
123 FF_CODEC_CAP_SETS_PKT_DTS,
124 };
125 #endif
126