2 * Sunplus JPEG decoder (SP5X)
3 * Copyright (c) 2003 Alex Beregszaszi
5 * This file is part of FFmpeg.
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.
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.
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
23 * @file libavcodec/sp5xdec.c
24 * Sunplus JPEG decoder (SP5X).
33 static int sp5x_decode_frame(AVCodecContext
*avctx
,
34 void *data
, int *data_size
,
37 const uint8_t *buf
= avpkt
->data
;
38 int buf_size
= avpkt
->size
;
39 AVPacket avpkt_recoded
;
41 MJpegDecodeContext
*s
= avctx
->priv_data
;
44 const uint8_t *buf_ptr
, *buf_end
;
48 if (!avctx
->width
|| !avctx
->height
)
52 buf_end
= buf
+ buf_size
;
55 recoded
= av_mallocz(buf_size
+ 1024);
63 memcpy(recoded
+j
, &sp5x_data_dqt
[0], sizeof(sp5x_data_dqt
));
64 memcpy(recoded
+j
+5, &sp5x_quant_table
[qscale
* 2], 64);
65 memcpy(recoded
+j
+70, &sp5x_quant_table
[(qscale
* 2) + 1], 64);
66 j
+= sizeof(sp5x_data_dqt
);
68 memcpy(recoded
+j
, &sp5x_data_dht
[0], sizeof(sp5x_data_dht
));
69 j
+= sizeof(sp5x_data_dht
);
71 memcpy(recoded
+j
, &sp5x_data_sof
[0], sizeof(sp5x_data_sof
));
72 AV_WB16(recoded
+j
+5, avctx
->coded_height
);
73 AV_WB16(recoded
+j
+7, avctx
->coded_width
);
74 j
+= sizeof(sp5x_data_sof
);
76 memcpy(recoded
+j
, &sp5x_data_sos
[0], sizeof(sp5x_data_sos
));
77 j
+= sizeof(sp5x_data_sos
);
79 if(avctx
->codec_id
==CODEC_ID_AMV
)
80 for (i
= 2; i
< buf_size
-2 && j
< buf_size
+1024-2; i
++)
81 recoded
[j
++] = buf
[i
];
83 for (i
= 14; i
< buf_size
&& j
< buf_size
+1024-2; i
++)
85 recoded
[j
++] = buf
[i
];
94 avctx
->flags
&= ~CODEC_FLAG_EMU_EDGE
;
95 av_init_packet(&avpkt_recoded
);
96 avpkt_recoded
.data
= recoded
;
97 avpkt_recoded
.size
= j
;
98 i
= ff_mjpeg_decode_frame(avctx
, data
, data_size
, &avpkt_recoded
);
105 s
->width
= avctx
->coded_width
;
106 s
->height
= avctx
->coded_height
;
107 s
->nb_components
= 3;
108 s
->component_id
[0] = 0;
111 s
->quant_index
[0] = 0;
112 s
->component_id
[1] = 1;
115 s
->quant_index
[1] = 1;
116 s
->component_id
[2] = 2;
119 s
->quant_index
[2] = 1;
123 s
->qscale_table
= av_mallocz((s
->width
+15)/16);
124 avctx
->pix_fmt
= s
->cs_itu601
? PIX_FMT_YUV420P
: PIX_FMT_YUVJ420
;
127 s
->picture
.reference
= 0;
128 if (avctx
->get_buffer(avctx
, &s
->picture
) < 0)
130 av_log(avctx
, AV_LOG_ERROR
, "get_buffer() failed\n");
134 s
->picture
.pict_type
= FF_I_TYPE
;
135 s
->picture
.key_frame
= 1;
137 for (i
= 0; i
< 3; i
++)
138 s
->linesize
[i
] = s
->picture
.linesize
[i
] << s
->interlaced
;
141 for (i
= 0; i
< 64; i
++)
143 j
= s
->scantable
.permutated
[i
];
144 s
->quant_matrixes
[0][j
] = sp5x_quant_table
[(qscale
* 2) + i
];
146 s
->qscale
[0] = FFMAX(
147 s
->quant_matrixes
[0][s
->scantable
.permutated
[1]],
148 s
->quant_matrixes
[0][s
->scantable
.permutated
[8]]) >> 1;
150 for (i
= 0; i
< 64; i
++)
152 j
= s
->scantable
.permutated
[i
];
153 s
->quant_matrixes
[1][j
] = sp5x_quant_table
[(qscale
* 2) + 1 + i
];
155 s
->qscale
[1] = FFMAX(
156 s
->quant_matrixes
[1][s
->scantable
.permutated
[1]],
157 s
->quant_matrixes
[1][s
->scantable
.permutated
[8]]) >> 1;
162 s
->comp_index
[0] = 0;
163 s
->nb_blocks
[0] = s
->h_count
[0] * s
->v_count
[0];
164 s
->h_scount
[0] = s
->h_count
[0];
165 s
->v_scount
[0] = s
->v_count
[0];
169 s
->comp_index
[1] = 1;
170 s
->nb_blocks
[1] = s
->h_count
[1] * s
->v_count
[1];
171 s
->h_scount
[1] = s
->h_count
[1];
172 s
->v_scount
[1] = s
->v_count
[1];
176 s
->comp_index
[2] = 2;
177 s
->nb_blocks
[2] = s
->h_count
[2] * s
->v_count
[2];
178 s
->h_scount
[2] = s
->h_count
[2];
179 s
->v_scount
[2] = s
->v_count
[2];
183 for (i
= 0; i
< 3; i
++)
184 s
->last_dc
[i
] = 1024;
186 s
->mb_width
= (s
->width
* s
->h_max
* 8 -1) / (s
->h_max
* 8);
187 s
->mb_height
= (s
->height
* s
->v_max
* 8 -1) / (s
->v_max
* 8);
189 init_get_bits(&s
->gb
, buf
+14, (buf_size
-14)*8);
191 return mjpeg_decode_scan(s
);
197 AVCodec sp5x_decoder
= {
201 sizeof(MJpegDecodeContext
),
202 ff_mjpeg_decode_init
,
208 .long_name
= NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
211 AVCodec amv_decoder
= {
215 sizeof(MJpegDecodeContext
),
216 ff_mjpeg_decode_init
,
220 .long_name
= NULL_IF_CONFIG_SMALL("AMV Video"),