FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/jvdec.c
Date: 2026-01-14 03:33:33
Exec Total Coverage
Lines: 110 121 90.9%
Functions: 6 6 100.0%
Branches: 73 86 84.9%
Line Branch Exec Source
1 /*
2 * Bitmap Brothers JV video decoder
3 * Copyright (c) 2011 Peter Ross <pross@xvid.org>
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 * Bitmap Brothers JV video decoder
25 * @author Peter Ross <pross@xvid.org>
26 */
27
28 #include "libavutil/intreadwrite.h"
29
30 #include "avcodec.h"
31 #include "blockdsp.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "get_bits.h"
35
36 typedef struct JvContext {
37 BlockDSPContext bdsp;
38 AVFrame *frame;
39 uint32_t palette[AVPALETTE_COUNT];
40 } JvContext;
41
42 3 static av_cold int decode_init(AVCodecContext *avctx)
43 {
44 3 JvContext *s = avctx->priv_data;
45
46
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 3 if (!avctx->width || !avctx->height ||
47
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 3 (avctx->width & 7) || (avctx->height & 7)) {
48 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
49 avctx->width, avctx->height);
50 ✗ return AVERROR(EINVAL);
51 }
52
53 3 s->frame = av_frame_alloc();
54
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 3 if (!s->frame)
55 ✗ return AVERROR(ENOMEM);
56
57 3 avctx->pix_fmt = AV_PIX_FMT_PAL8;
58 3 ff_blockdsp_init(&s->bdsp);
59 3 return 0;
60 }
61
62 /**
63 * Decode 2x2 block
64 */
65 14056 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
66 {
67 int i, j, v[2];
68
69
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 14056 switch (get_bits(gb, 2)) {
70 348 case 1:
71 348 v[0] = get_bits(gb, 8);
72
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 1044 for (j = 0; j < 2; j++)
73 696 memset(dst + j * linesize, v[0], 2);
74 348 break;
75 9984 case 2:
76 9984 v[0] = get_bits(gb, 8);
77 9984 v[1] = get_bits(gb, 8);
78
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79
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80 39936 dst[j * linesize + i] = v[get_bits1(gb)];
81 9984 break;
82 51 case 3:
83
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84
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 306 for (i = 0; i < 2; i++)
85 204 dst[j * linesize + i] = get_bits(gb, 8);
86 }
87 14056 }
88
89 /**
90 * Decode 4x4 block
91 */
92 17028 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
93 {
94 int i, j, v[2];
95
96
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 17028 switch (get_bits(gb, 2)) {
97 139 case 1:
98 139 v[0] = get_bits(gb, 8);
99
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 695 for (j = 0; j < 4; j++)
100 556 memset(dst + j * linesize, v[0], 4);
101 139 break;
102 11062 case 2:
103 11062 v[0] = get_bits(gb, 8);
104 11062 v[1] = get_bits(gb, 8);
105
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 33186 for (j = 2; j >= 0; j -= 2) {
106
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107 88496 dst[j * linesize + i] = v[get_bits1(gb)];
108
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 110620 for (i = 0; i < 4; i++)
109 88496 dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
110 }
111 11062 break;
112 3514 case 3:
113
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114
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 21084 for (i = 0; i < 4; i += 2)
115 14056 decode2x2(gb, dst + j * linesize + i, linesize);
116 }
117 17028 }
118
119 /**
120 * Decode 8x8 block
121 */
122 6000 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
123 BlockDSPContext *bdsp)
124 {
125 int i, j, v[2];
126
127
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 6000 switch (get_bits(gb, 2)) {
128 29 case 1:
129 29 v[0] = get_bits(gb, 8);
130 29 bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
131 29 break;
132 218 case 2:
133 218 v[0] = get_bits(gb, 8);
134 218 v[1] = get_bits(gb, 8);
135
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 1962 for (j = 7; j >= 0; j--)
136
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137 13952 dst[j * linesize + i] = v[get_bits1(gb)];
138 218 break;
139 4257 case 3:
140
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 12771 for (j = 0; j < 8; j += 4)
141
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 25542 for (i = 0; i < 8; i += 4)
142 17028 decode4x4(gb, dst + j * linesize + i, linesize);
143 }
144 6000 }
145
146 9 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
147 int *got_frame, AVPacket *avpkt)
148 {
149 9 JvContext *s = avctx->priv_data;
150 9 const uint8_t *buf = avpkt->data;
151 9 const uint8_t *buf_end = buf + avpkt->size;
152 int video_size, video_type, i, j, ret;
153
154
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 9 if (avpkt->size < 6)
155 ✗ return AVERROR_INVALIDDATA;
156
157 9 video_size = AV_RL32(buf);
158 9 video_type = buf[4];
159 9 buf += 5;
160
161
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 9 if (video_size) {
162
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 8 if (video_size < 0 || video_size > avpkt->size - 5) {
163 1 av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
164 1 return AVERROR_INVALIDDATA;
165 }
166
167
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 7 if (video_type == 0 || video_type == 1) {
168 GetBitContext gb;
169 6 init_get_bits(&gb, buf, 8 * video_size);
170
171
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 6 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
172 ✗ return ret;
173
174
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 6 if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
175 ✗ av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
176 ✗ return AVERROR_INVALIDDATA;
177 }
178
179
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 156 for (j = 0; j < avctx->height; j += 8)
180
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181 6000 decode8x8(&gb,
182 6000 s->frame->data[0] + j * s->frame->linesize[0] + i,
183 6000 s->frame->linesize[0], &s->bdsp);
184
185 6 buf += video_size;
186
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 1 } else if (video_type == 2) {
187 1 int v = *buf++;
188
189 1 av_frame_unref(s->frame);
190
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 1 if ((ret = ff_get_buffer(avctx, s->frame, AV_GET_BUFFER_FLAG_REF)) < 0)
191 ✗ return ret;
192
193
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 201 for (j = 0; j < avctx->height; j++)
194 200 memset(s->frame->data[0] + j * s->frame->linesize[0],
195 200 v, avctx->width);
196 } else {
197 ✗ av_log(avctx, AV_LOG_WARNING,
198 "unsupported frame type %i\n", video_type);
199 ✗ return AVERROR_INVALIDDATA;
200 }
201 }
202
203
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 8 if (buf_end - buf >= AVPALETTE_COUNT * 3) {
204
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 257 for (i = 0; i < AVPALETTE_COUNT; i++) {
205 256 uint32_t pal = AV_RB24(buf);
206 256 s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
207 256 buf += 3;
208 }
209 }
210
211
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 8 if (video_size) {
212 7 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
213
214
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 7 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
215 ✗ return ret;
216 7 *got_frame = 1;
217 }
218
219 8 return avpkt->size;
220 }
221
222 3 static av_cold int decode_close(AVCodecContext *avctx)
223 {
224 3 JvContext *s = avctx->priv_data;
225
226 3 av_frame_free(&s->frame);
227
228 3 return 0;
229 }
230
231 const FFCodec ff_jv_decoder = {
232 .p.name = "jv",
233 CODEC_LONG_NAME("Bitmap Brothers JV video"),
234 .p.type = AVMEDIA_TYPE_VIDEO,
235 .p.id = AV_CODEC_ID_JV,
236 .priv_data_size = sizeof(JvContext),
237 .init = decode_init,
238 .close = decode_close,
239 FF_CODEC_DECODE_CB(decode_frame),
240 .p.capabilities = AV_CODEC_CAP_DR1,
241 };
242