FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/wnv1.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 37 50 74.0%
Branches: 10 18 55.6%

Line Branch Exec Source
1 /*
2 * Winnov WNV1 codec
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * Winnov WNV1 codec.
25 */
26
27 #include "libavutil/thread.h"
28
29 #define BITSTREAM_READER_LE
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "internal.h"
33
34 static const uint8_t code_tab[16][2] = {
35 { 7, 1 }, { 8, 3 }, { 6, 3 }, { 9, 4 }, { 5, 4 }, { 10, 5 }, { 4, 5 },
36 { 11, 6 }, { 3, 6 }, { 12, 7 }, { 2, 7 }, { 13, 8 }, { 1, 8 }, { 14, 9 },
37 { 0, 9 }, { 15, 8 }
38 };
39
40 #define CODE_VLC_BITS 9
41 static VLC code_vlc;
42
43 /* returns modified base_value */
44 3302400 static inline int wnv1_get_code(GetBitContext *gb, int shift, int base_value)
45 {
46 3302400 int v = get_vlc2(gb, code_vlc.table, CODE_VLC_BITS, 1);
47
48
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3302400 if (v == 8)
49 70676 return get_bits(gb, 8 - shift) << shift;
50 else
51 3231724 return base_value + v * (1 << shift);
52 }
53
54 86 static int decode_frame(AVCodecContext *avctx,
55 void *data, int *got_frame,
56 AVPacket *avpkt)
57 {
58 86 const uint8_t *buf = avpkt->data;
59 86 int buf_size = avpkt->size;
60 86 AVFrame * const p = data;
61 GetBitContext gb;
62 unsigned char *Y,*U,*V;
63 int i, j, ret, shift;
64 86 int prev_y = 0, prev_u = 0, prev_v = 0;
65
66
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86 if (buf_size < 8 + avctx->height * (avctx->width/2)/8) {
67 av_log(avctx, AV_LOG_ERROR, "Packet size %d is too small\n", buf_size);
68 return AVERROR_INVALIDDATA;
69 }
70
71
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86 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
72 return ret;
73 86 p->key_frame = 1;
74
75
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86 if ((ret = init_get_bits8(&gb, buf + 8, buf_size - 8)) < 0)
76 return ret;
77
78
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86 if (buf[2] >> 4 == 6)
79 86 shift = 2;
80 else {
81 shift = 8 - (buf[2] >> 4);
82 if (shift > 4) {
83 avpriv_request_sample(avctx,
84 "Unknown WNV1 frame header value %i",
85 buf[2] >> 4);
86 shift = 4;
87 }
88 if (shift < 1) {
89 avpriv_request_sample(avctx,
90 "Unknown WNV1 frame header value %i",
91 buf[2] >> 4);
92 shift = 1;
93 }
94 }
95
96 86 Y = p->data[0];
97 86 U = p->data[1];
98 86 V = p->data[2];
99
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10406 for (j = 0; j < avctx->height; j++) {
100
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835920 for (i = 0; i < avctx->width / 2; i++) {
101 825600 Y[i * 2] = wnv1_get_code(&gb, shift, prev_y);
102 825600 prev_u = U[i] = wnv1_get_code(&gb, shift, prev_u);
103 825600 prev_y = Y[(i * 2) + 1] = wnv1_get_code(&gb, shift, Y[i * 2]);
104 825600 prev_v = V[i] = wnv1_get_code(&gb, shift, prev_v);
105 }
106 10320 Y += p->linesize[0];
107 10320 U += p->linesize[1];
108 10320 V += p->linesize[2];
109 }
110
111
112 86 *got_frame = 1;
113
114 86 return buf_size;
115 }
116
117 1 static av_cold void wnv1_init_static(void)
118 {
119 1 INIT_VLC_STATIC_FROM_LENGTHS(&code_vlc, CODE_VLC_BITS, 16,
120 &code_tab[0][1], 2,
121 &code_tab[0][0], 2, 1,
122 -7, INIT_VLC_OUTPUT_LE, 1 << CODE_VLC_BITS);
123 1 }
124
125 2 static av_cold int decode_init(AVCodecContext *avctx)
126 {
127 static AVOnce init_static_once = AV_ONCE_INIT;
128
129 2 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
130
131 2 ff_thread_once(&init_static_once, wnv1_init_static);
132
133 2 return 0;
134 }
135
136 const AVCodec ff_wnv1_decoder = {
137 .name = "wnv1",
138 .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
139 .type = AVMEDIA_TYPE_VIDEO,
140 .id = AV_CODEC_ID_WNV1,
141 .init = decode_init,
142 .decode = decode_frame,
143 .capabilities = AV_CODEC_CAP_DR1,
144 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
145 };
146