lavc: fix decode_frame() third parameter semantics for video decoders
[libav.git] / libavcodec / xl.c
1 /*
2 * Miro VideoXL codec
3 * Copyright (c) 2004 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 * Miro VideoXL codec.
25 */
26
27 #include "libavutil/common.h"
28 #include "libavutil/intreadwrite.h"
29 #include "avcodec.h"
30 #include "internal.h"
31
32 typedef struct VideoXLContext{
33 AVCodecContext *avctx;
34 AVFrame pic;
35 } VideoXLContext;
36
37 static const int xl_table[32] = {
38 0, 1, 2, 3, 4, 5, 6, 7,
39 8, 9, 12, 15, 20, 25, 34, 46,
40 64, 82, 94, 103, 108, 113, 116, 119,
41 120, 121, 122, 123, 124, 125, 126, 127};
42
43 static int decode_frame(AVCodecContext *avctx,
44 void *data, int *got_frame,
45 AVPacket *avpkt)
46 {
47 const uint8_t *buf = avpkt->data;
48 int buf_size = avpkt->size;
49 VideoXLContext * const a = avctx->priv_data;
50 AVFrame * const p = &a->pic;
51 uint8_t *Y, *U, *V;
52 int i, j;
53 int stride;
54 uint32_t val;
55 int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
56
57 if(p->data[0])
58 avctx->release_buffer(avctx, p);
59
60 p->reference = 0;
61 if(ff_get_buffer(avctx, p) < 0){
62 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
63 return -1;
64 }
65 p->pict_type= AV_PICTURE_TYPE_I;
66 p->key_frame= 1;
67
68 Y = a->pic.data[0];
69 U = a->pic.data[1];
70 V = a->pic.data[2];
71
72 stride = avctx->width - 4;
73
74 if (buf_size < avctx->width * avctx->height) {
75 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
76 return AVERROR_INVALIDDATA;
77 }
78
79 for (i = 0; i < avctx->height; i++) {
80 /* lines are stored in reversed order */
81 buf += stride;
82
83 for (j = 0; j < avctx->width; j += 4) {
84 /* value is stored in LE dword with word swapped */
85 val = AV_RL32(buf);
86 buf -= 4;
87 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
88
89 if(!j)
90 y0 = (val & 0x1F) << 2;
91 else
92 y0 = y3 + xl_table[val & 0x1F];
93 val >>= 5;
94 y1 = y0 + xl_table[val & 0x1F];
95 val >>= 5;
96 y2 = y1 + xl_table[val & 0x1F];
97 val >>= 6; /* align to word */
98 y3 = y2 + xl_table[val & 0x1F];
99 val >>= 5;
100 if(!j)
101 c0 = (val & 0x1F) << 2;
102 else
103 c0 += xl_table[val & 0x1F];
104 val >>= 5;
105 if(!j)
106 c1 = (val & 0x1F) << 2;
107 else
108 c1 += xl_table[val & 0x1F];
109
110 Y[j + 0] = y0 << 1;
111 Y[j + 1] = y1 << 1;
112 Y[j + 2] = y2 << 1;
113 Y[j + 3] = y3 << 1;
114
115 U[j >> 2] = c0 << 1;
116 V[j >> 2] = c1 << 1;
117 }
118
119 buf += avctx->width + 4;
120 Y += a->pic.linesize[0];
121 U += a->pic.linesize[1];
122 V += a->pic.linesize[2];
123 }
124
125 *got_frame = 1;
126 *(AVFrame*)data = a->pic;
127
128 return buf_size;
129 }
130
131 static av_cold int decode_init(AVCodecContext *avctx){
132 // VideoXLContext * const a = avctx->priv_data;
133
134 avctx->pix_fmt= AV_PIX_FMT_YUV411P;
135
136 return 0;
137 }
138
139 static av_cold int decode_end(AVCodecContext *avctx){
140 VideoXLContext * const a = avctx->priv_data;
141 AVFrame *pic = &a->pic;
142
143 if (pic->data[0])
144 avctx->release_buffer(avctx, pic);
145
146 return 0;
147 }
148
149 AVCodec ff_xl_decoder = {
150 .name = "xl",
151 .type = AVMEDIA_TYPE_VIDEO,
152 .id = AV_CODEC_ID_VIXL,
153 .priv_data_size = sizeof(VideoXLContext),
154 .init = decode_init,
155 .close = decode_end,
156 .decode = decode_frame,
157 .capabilities = CODEC_CAP_DR1,
158 .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
159 };