FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/jvdec.c
Date: 2025-03-22 04:08:01
Exec Total Coverage
Lines: 113 124 91.1%
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 #if FF_API_PALETTE_HAS_CHANGED
41 int palette_has_changed;
42 #endif
43 } JvContext;
44
45 3 static av_cold int decode_init(AVCodecContext *avctx)
46 {
47 3 JvContext *s = avctx->priv_data;
48
49
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 3 if (!avctx->width || !avctx->height ||
50
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 3 (avctx->width & 7) || (avctx->height & 7)) {
51 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
52 avctx->width, avctx->height);
53 ✗ return AVERROR(EINVAL);
54 }
55
56 3 s->frame = av_frame_alloc();
57
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 3 if (!s->frame)
58 ✗ return AVERROR(ENOMEM);
59
60 3 avctx->pix_fmt = AV_PIX_FMT_PAL8;
61 3 ff_blockdsp_init(&s->bdsp);
62 3 return 0;
63 }
64
65 /**
66 * Decode 2x2 block
67 */
68 14056 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
69 {
70 int i, j, v[2];
71
72
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 14056 switch (get_bits(gb, 2)) {
73 348 case 1:
74 348 v[0] = get_bits(gb, 8);
75
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 1044 for (j = 0; j < 2; j++)
76 696 memset(dst + j * linesize, v[0], 2);
77 348 break;
78 9984 case 2:
79 9984 v[0] = get_bits(gb, 8);
80 9984 v[1] = get_bits(gb, 8);
81
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82
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83 39936 dst[j * linesize + i] = v[get_bits1(gb)];
84 9984 break;
85 51 case 3:
86
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87
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 306 for (i = 0; i < 2; i++)
88 204 dst[j * linesize + i] = get_bits(gb, 8);
89 }
90 14056 }
91
92 /**
93 * Decode 4x4 block
94 */
95 17028 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
96 {
97 int i, j, v[2];
98
99
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 17028 switch (get_bits(gb, 2)) {
100 139 case 1:
101 139 v[0] = get_bits(gb, 8);
102
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 695 for (j = 0; j < 4; j++)
103 556 memset(dst + j * linesize, v[0], 4);
104 139 break;
105 11062 case 2:
106 11062 v[0] = get_bits(gb, 8);
107 11062 v[1] = get_bits(gb, 8);
108
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 33186 for (j = 2; j >= 0; j -= 2) {
109
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110 88496 dst[j * linesize + i] = v[get_bits1(gb)];
111
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 110620 for (i = 0; i < 4; i++)
112 88496 dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
113 }
114 11062 break;
115 3514 case 3:
116
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117
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118 14056 decode2x2(gb, dst + j * linesize + i, linesize);
119 }
120 17028 }
121
122 /**
123 * Decode 8x8 block
124 */
125 6000 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
126 BlockDSPContext *bdsp)
127 {
128 int i, j, v[2];
129
130
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 6000 switch (get_bits(gb, 2)) {
131 29 case 1:
132 29 v[0] = get_bits(gb, 8);
133 29 bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
134 29 break;
135 218 case 2:
136 218 v[0] = get_bits(gb, 8);
137 218 v[1] = get_bits(gb, 8);
138
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 1962 for (j = 7; j >= 0; j--)
139
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140 13952 dst[j * linesize + i] = v[get_bits1(gb)];
141 218 break;
142 4257 case 3:
143
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 12771 for (j = 0; j < 8; j += 4)
144
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145 17028 decode4x4(gb, dst + j * linesize + i, linesize);
146 }
147 6000 }
148
149 9 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
150 int *got_frame, AVPacket *avpkt)
151 {
152 9 JvContext *s = avctx->priv_data;
153 9 const uint8_t *buf = avpkt->data;
154 9 const uint8_t *buf_end = buf + avpkt->size;
155 int video_size, video_type, i, j, ret;
156
157
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 9 if (avpkt->size < 6)
158 ✗ return AVERROR_INVALIDDATA;
159
160 9 video_size = AV_RL32(buf);
161 9 video_type = buf[4];
162 9 buf += 5;
163
164
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 9 if (video_size) {
165
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 8 if (video_size < 0 || video_size > avpkt->size - 5) {
166 1 av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
167 1 return AVERROR_INVALIDDATA;
168 }
169
170
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 7 if (video_type == 0 || video_type == 1) {
171 GetBitContext gb;
172 6 init_get_bits(&gb, buf, 8 * video_size);
173
174
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 6 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
175 ✗ return ret;
176
177
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 6 if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
178 ✗ av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
179 ✗ return AVERROR_INVALIDDATA;
180 }
181
182
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 156 for (j = 0; j < avctx->height; j += 8)
183
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184 6000 decode8x8(&gb,
185 6000 s->frame->data[0] + j * s->frame->linesize[0] + i,
186 6000 s->frame->linesize[0], &s->bdsp);
187
188 6 buf += video_size;
189
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 1 } else if (video_type == 2) {
190 1 int v = *buf++;
191
192 1 av_frame_unref(s->frame);
193
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 1 if ((ret = ff_get_buffer(avctx, s->frame, AV_GET_BUFFER_FLAG_REF)) < 0)
194 ✗ return ret;
195
196
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 201 for (j = 0; j < avctx->height; j++)
197 200 memset(s->frame->data[0] + j * s->frame->linesize[0],
198 200 v, avctx->width);
199 } else {
200 ✗ av_log(avctx, AV_LOG_WARNING,
201 "unsupported frame type %i\n", video_type);
202 ✗ return AVERROR_INVALIDDATA;
203 }
204 }
205
206
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 8 if (buf_end - buf >= AVPALETTE_COUNT * 3) {
207
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 257 for (i = 0; i < AVPALETTE_COUNT; i++) {
208 256 uint32_t pal = AV_RB24(buf);
209 256 s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
210 256 buf += 3;
211 }
212 #if FF_API_PALETTE_HAS_CHANGED
213 1 s->palette_has_changed = 1;
214 #endif
215 }
216
217
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 8 if (video_size) {
218 #if FF_API_PALETTE_HAS_CHANGED
219 FF_DISABLE_DEPRECATION_WARNINGS
220 7 s->frame->palette_has_changed = s->palette_has_changed;
221 7 s->palette_has_changed = 0;
222 FF_ENABLE_DEPRECATION_WARNINGS
223 #endif
224 7 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
225
226
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 7 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
227 ✗ return ret;
228 7 *got_frame = 1;
229 }
230
231 8 return avpkt->size;
232 }
233
234 3 static av_cold int decode_close(AVCodecContext *avctx)
235 {
236 3 JvContext *s = avctx->priv_data;
237
238 3 av_frame_free(&s->frame);
239
240 3 return 0;
241 }
242
243 const FFCodec ff_jv_decoder = {
244 .p.name = "jv",
245 CODEC_LONG_NAME("Bitmap Brothers JV video"),
246 .p.type = AVMEDIA_TYPE_VIDEO,
247 .p.id = AV_CODEC_ID_JV,
248 .priv_data_size = sizeof(JvContext),
249 .init = decode_init,
250 .close = decode_close,
251 FF_CODEC_DECODE_CB(decode_frame),
252 .p.capabilities = AV_CODEC_CAP_DR1,
253 };
254