vlc: Add header #include when the types are used
[libav.git] / libavcodec / wnv1.c
1 /*
2 * Winnov WNV1 codec
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 * Winnov WNV1 codec.
25 */
26
27 #include "avcodec.h"
28 #include "bitstream.h"
29 #include "internal.h"
30 #include "mathops.h"
31 #include "vlc.h"
32
33
34 typedef struct WNV1Context {
35 AVCodecContext *avctx;
36
37 int shift;
38 BitstreamContext bc;
39 } WNV1Context;
40
41 static const uint16_t code_tab[16][2] = {
42 { 0x1FD, 9 }, { 0xFD, 8 }, { 0x7D, 7 }, { 0x3D, 6 }, { 0x1D, 5 }, { 0x0D, 4 }, { 0x005, 3 },
43 { 0x000, 1 },
44 { 0x004, 3 }, { 0x0C, 4 }, { 0x1C, 5 }, { 0x3C, 6 }, { 0x7C, 7 }, { 0xFC, 8 }, { 0x1FC, 9 }, { 0xFF, 8 }
45 };
46
47 #define CODE_VLC_BITS 9
48 static VLC code_vlc;
49
50 /* returns modified base_value */
51 static inline int wnv1_get_code(WNV1Context *w, int base_value)
52 {
53 int v = bitstream_read_vlc(&w->bc, code_vlc.table, CODE_VLC_BITS, 1);
54
55 if (v == 15)
56 return ff_reverse[bitstream_read(&w->bc, 8 - w->shift)];
57 else
58 return base_value + ((v - 7) << w->shift);
59 }
60
61 static int decode_frame(AVCodecContext *avctx,
62 void *data, int *got_frame,
63 AVPacket *avpkt)
64 {
65 WNV1Context * const l = avctx->priv_data;
66 const uint8_t *buf = avpkt->data;
67 int buf_size = avpkt->size;
68 AVFrame * const p = data;
69 unsigned char *Y,*U,*V;
70 int i, j, ret;
71 int prev_y = 0, prev_u = 0, prev_v = 0;
72 uint8_t *rbuf;
73
74 if (buf_size < 8) {
75 av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
76 return AVERROR_INVALIDDATA;
77 }
78
79 rbuf = av_malloc(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
80 if (!rbuf) {
81 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
82 return AVERROR(ENOMEM);
83 }
84
85 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
86 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
87 av_free(rbuf);
88 return ret;
89 }
90 p->key_frame = 1;
91
92 for (i = 8; i < buf_size; i++)
93 rbuf[i] = ff_reverse[buf[i]];
94 bitstream_init8(&l->bc, rbuf + 8, buf_size - 8);
95
96 if (buf[2] >> 4 == 6)
97 l->shift = 2;
98 else {
99 l->shift = 8 - (buf[2] >> 4);
100 if (l->shift > 4) {
101 avpriv_request_sample(avctx,
102 "Unknown WNV1 frame header value %i",
103 buf[2] >> 4);
104 l->shift = 4;
105 }
106 if (l->shift < 1) {
107 avpriv_request_sample(avctx,
108 "Unknown WNV1 frame header value %i",
109 buf[2] >> 4);
110 l->shift = 1;
111 }
112 }
113
114 Y = p->data[0];
115 U = p->data[1];
116 V = p->data[2];
117 for (j = 0; j < avctx->height; j++) {
118 for (i = 0; i < avctx->width / 2; i++) {
119 Y[i * 2] = wnv1_get_code(l, prev_y);
120 prev_u = U[i] = wnv1_get_code(l, prev_u);
121 prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]);
122 prev_v = V[i] = wnv1_get_code(l, prev_v);
123 }
124 Y += p->linesize[0];
125 U += p->linesize[1];
126 V += p->linesize[2];
127 }
128
129
130 *got_frame = 1;
131 av_free(rbuf);
132
133 return buf_size;
134 }
135
136 static av_cold int decode_init(AVCodecContext *avctx)
137 {
138 WNV1Context * const l = avctx->priv_data;
139 static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
140
141 l->avctx = avctx;
142 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
143
144 code_vlc.table = code_table;
145 code_vlc.table_allocated = 1 << CODE_VLC_BITS;
146 init_vlc(&code_vlc, CODE_VLC_BITS, 16,
147 &code_tab[0][1], 4, 2,
148 &code_tab[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
149
150 return 0;
151 }
152
153 AVCodec ff_wnv1_decoder = {
154 .name = "wnv1",
155 .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
156 .type = AVMEDIA_TYPE_VIDEO,
157 .id = AV_CODEC_ID_WNV1,
158 .priv_data_size = sizeof(WNV1Context),
159 .init = decode_init,
160 .decode = decode_frame,
161 .capabilities = AV_CODEC_CAP_DR1,
162 };