Move AVPacket up a bit, so that structs/functions that include AVPacket can
[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/**
bad5537e 23 * @file libavcodec/wnv1.c
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24 * Winnov WNV1 codec.
25 */
115329f1 26
a8a15e9d 27#include "avcodec.h"
083b80b5 28#include "bitstream.h"
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29
30
31typedef struct WNV1Context{
32 AVCodecContext *avctx;
33 AVFrame pic;
34
35 int shift;
083b80b5 36 GetBitContext gb;
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37} WNV1Context;
38
cf2baeb3 39static const uint16_t code_tab[16][2]={
083b80b5 40{0x1FD,9}, {0xFD,8}, {0x7D,7}, {0x3D,6}, {0x1D,5}, {0x0D,4}, {0x005,3},
115329f1 41{0x000,1},
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42{0x004,3}, {0x0C,4}, {0x1C,5}, {0x3C,6}, {0x7C,7}, {0xFC,8}, {0x1FC,9}, {0xFF,8}
43};
44
45#define CODE_VLC_BITS 9
46static VLC code_vlc;
47
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48/* returns modified base_value */
49static inline int wnv1_get_code(WNV1Context *w, int base_value)
50{
083b80b5 51 int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1);
a8a15e9d 52
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53 if(v==15)
54 return ff_reverse[ get_bits(&w->gb, 8 - w->shift) ];
55 else
56 return base_value + ((v - 7)<<w->shift);
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57}
58
115329f1 59static int decode_frame(AVCodecContext *avctx,
a8a15e9d 60 void *data, int *data_size,
b7093975 61 const uint8_t *buf, int buf_size)
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62{
63 WNV1Context * const l = avctx->priv_data;
64 AVFrame * const p= (AVFrame*)&l->pic;
65 unsigned char *Y,*U,*V;
66 int i, j;
67 int prev_y = 0, prev_u = 0, prev_v = 0;
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68 uint8_t *rbuf;
69
70 rbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
71 if(!rbuf){
72 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
73 return -1;
74 }
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75
76 if(p->data[0])
77 avctx->release_buffer(avctx, p);
78
79 p->reference = 0;
80 if(avctx->get_buffer(avctx, p) < 0){
81 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
b7093975 82 av_free(rbuf);
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83 return -1;
84 }
85 p->key_frame = 1;
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86
87 for(i=8; i<buf_size; i++)
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88 rbuf[i]= ff_reverse[ buf[i] ];
89 init_get_bits(&l->gb, rbuf+8, (buf_size-8)*8);
083b80b5 90
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91 if (buf[2] >> 4 == 6)
92 l->shift = 2;
93 else {
94 l->shift = 8 - (buf[2] >> 4);
95 if (l->shift > 4) {
96 av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
97 l->shift = 4;
98 }
99 if (l->shift < 1) {
100 av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
101 l->shift = 1;
102 }
103 }
115329f1 104
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105 Y = p->data[0];
106 U = p->data[1];
107 V = p->data[2];
108 for (j = 0; j < avctx->height; j++) {
109 for (i = 0; i < avctx->width / 2; i++) {
110 Y[i * 2] = wnv1_get_code(l, prev_y);
111 prev_u = U[i] = wnv1_get_code(l, prev_u);
112 prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]);
113 prev_v = V[i] = wnv1_get_code(l, prev_v);
114 }
115 Y += p->linesize[0];
116 U += p->linesize[1];
117 V += p->linesize[2];
118 }
119
115329f1 120
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121 *data_size = sizeof(AVFrame);
122 *(AVFrame*)data = l->pic;
b7093975 123 av_free(rbuf);
115329f1 124
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125 return buf_size;
126}
127
98a6fff9 128static av_cold int decode_init(AVCodecContext *avctx){
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129 WNV1Context * const l = avctx->priv_data;
130
131 l->avctx = avctx;
132 avctx->pix_fmt = PIX_FMT_YUV422P;
133
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134 if(!code_vlc.table){
135 init_vlc(&code_vlc, CODE_VLC_BITS, 16,
136 &code_tab[0][1], 4, 2,
137 &code_tab[0][0], 4, 2, 1);
138 }
139
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140 return 0;
141}
142
143AVCodec wnv1_decoder = {
144 "wnv1",
145 CODEC_TYPE_VIDEO,
146 CODEC_ID_WNV1,
147 sizeof(WNV1Context),
148 decode_init,
149 NULL,
150 NULL,
151 decode_frame,
152 CODEC_CAP_DR1,
fe4bf374 153 .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
a8a15e9d 154};