get rid of the last svn mentions
[libav.git] / libavcodec / wnv1.c
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1/*
2 * Winnov WNV1 codec
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
a8a15e9d 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
a8a15e9d 20 */
115329f1 21
a8a15e9d 22/**
ba87f080 23 * @file
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24 * Winnov WNV1 codec.
25 */
115329f1 26
a8a15e9d 27#include "avcodec.h"
9106a698 28#include "get_bits.h"
91cc5d37 29#include "libavutil/common.h"
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30
31
32typedef struct WNV1Context{
33 AVCodecContext *avctx;
34 AVFrame pic;
35
36 int shift;
083b80b5 37 GetBitContext gb;
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38} WNV1Context;
39
cf2baeb3 40static const uint16_t code_tab[16][2]={
083b80b5 41{0x1FD,9}, {0xFD,8}, {0x7D,7}, {0x3D,6}, {0x1D,5}, {0x0D,4}, {0x005,3},
115329f1 42{0x000,1},
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43{0x004,3}, {0x0C,4}, {0x1C,5}, {0x3C,6}, {0x7C,7}, {0xFC,8}, {0x1FC,9}, {0xFF,8}
44};
45
46#define CODE_VLC_BITS 9
47static VLC code_vlc;
48
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49/* returns modified base_value */
50static inline int wnv1_get_code(WNV1Context *w, int base_value)
51{
083b80b5 52 int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1);
a8a15e9d 53
083b80b5 54 if(v==15)
91cc5d37 55 return av_reverse[ get_bits(&w->gb, 8 - w->shift) ];
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56 else
57 return base_value + ((v - 7)<<w->shift);
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58}
59
115329f1 60static int decode_frame(AVCodecContext *avctx,
a8a15e9d 61 void *data, int *data_size,
7a00bbad 62 AVPacket *avpkt)
a8a15e9d 63{
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64 const uint8_t *buf = avpkt->data;
65 int buf_size = avpkt->size;
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66 WNV1Context * const l = avctx->priv_data;
67 AVFrame * const p= (AVFrame*)&l->pic;
68 unsigned char *Y,*U,*V;
69 int i, j;
70 int prev_y = 0, prev_u = 0, prev_v = 0;
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71 uint8_t *rbuf;
72
73 rbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
74 if(!rbuf){
75 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
76 return -1;
77 }
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78
79 if(p->data[0])
80 avctx->release_buffer(avctx, p);
81
82 p->reference = 0;
83 if(avctx->get_buffer(avctx, p) < 0){
84 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
b7093975 85 av_free(rbuf);
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86 return -1;
87 }
88 p->key_frame = 1;
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89
90 for(i=8; i<buf_size; i++)
91cc5d37 91 rbuf[i]= av_reverse[ buf[i] ];
b7093975 92 init_get_bits(&l->gb, rbuf+8, (buf_size-8)*8);
083b80b5 93
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94 if (buf[2] >> 4 == 6)
95 l->shift = 2;
96 else {
97 l->shift = 8 - (buf[2] >> 4);
98 if (l->shift > 4) {
99 av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
100 l->shift = 4;
101 }
102 if (l->shift < 1) {
103 av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
104 l->shift = 1;
105 }
106 }
115329f1 107
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108 Y = p->data[0];
109 U = p->data[1];
110 V = p->data[2];
111 for (j = 0; j < avctx->height; j++) {
112 for (i = 0; i < avctx->width / 2; i++) {
113 Y[i * 2] = wnv1_get_code(l, prev_y);
114 prev_u = U[i] = wnv1_get_code(l, prev_u);
115 prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]);
116 prev_v = V[i] = wnv1_get_code(l, prev_v);
117 }
118 Y += p->linesize[0];
119 U += p->linesize[1];
120 V += p->linesize[2];
121 }
122
115329f1 123
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124 *data_size = sizeof(AVFrame);
125 *(AVFrame*)data = l->pic;
b7093975 126 av_free(rbuf);
115329f1 127
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128 return buf_size;
129}
130
98a6fff9 131static av_cold int decode_init(AVCodecContext *avctx){
a8a15e9d 132 WNV1Context * const l = avctx->priv_data;
bd4110f9 133 static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
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134
135 l->avctx = avctx;
136 avctx->pix_fmt = PIX_FMT_YUV422P;
137
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138 code_vlc.table = code_table;
139 code_vlc.table_allocated = 1 << CODE_VLC_BITS;
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140 init_vlc(&code_vlc, CODE_VLC_BITS, 16,
141 &code_tab[0][1], 4, 2,
142 &code_tab[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
083b80b5 143
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144 return 0;
145}
146
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147static av_cold int decode_end(AVCodecContext *avctx){
148 WNV1Context * const l = avctx->priv_data;
149 AVFrame *pic = &l->pic;
150
151 if (pic->data[0])
152 avctx->release_buffer(avctx, pic);
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153
154 return 0;
155}
156
d36beb3f 157AVCodec ff_wnv1_decoder = {
a8a15e9d 158 "wnv1",
72415b2a 159 AVMEDIA_TYPE_VIDEO,
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160 CODEC_ID_WNV1,
161 sizeof(WNV1Context),
162 decode_init,
163 NULL,
6d924b5a 164 decode_end,
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165 decode_frame,
166 CODEC_CAP_DR1,
fe4bf374 167 .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
a8a15e9d 168};