FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/jvdec.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 115 126 91.3%
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 "get_bits.h"
34 #include "internal.h"
35
36 typedef struct JvContext {
37 BlockDSPContext bdsp;
38 AVFrame *frame;
39 uint32_t palette[AVPALETTE_COUNT];
40 int palette_has_changed;
41 } JvContext;
42
43 3 static av_cold int decode_init(AVCodecContext *avctx)
44 {
45 3 JvContext *s = avctx->priv_data;
46
47
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3 if (!avctx->width || !avctx->height ||
48
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3 (avctx->width & 7) || (avctx->height & 7)) {
49 av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
50 avctx->width, avctx->height);
51 return AVERROR(EINVAL);
52 }
53
54 3 s->frame = av_frame_alloc();
55
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3 if (!s->frame)
56 return AVERROR(ENOMEM);
57
58 3 avctx->pix_fmt = AV_PIX_FMT_PAL8;
59 3 ff_blockdsp_init(&s->bdsp, avctx);
60 3 return 0;
61 }
62
63 /**
64 * Decode 2x2 block
65 */
66 14056 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
67 {
68 int i, j, v[2];
69
70
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14056 switch (get_bits(gb, 2)) {
71 348 case 1:
72 348 v[0] = get_bits(gb, 8);
73
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1044 for (j = 0; j < 2; j++)
74 696 memset(dst + j * linesize, v[0], 2);
75 348 break;
76 9984 case 2:
77 9984 v[0] = get_bits(gb, 8);
78 9984 v[1] = get_bits(gb, 8);
79
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80
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59904 for (i = 0; i < 2; i++)
81 39936 dst[j * linesize + i] = v[get_bits1(gb)];
82 9984 break;
83 51 case 3:
84
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153 for (j = 0; j < 2; j++)
85
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306 for (i = 0; i < 2; i++)
86 204 dst[j * linesize + i] = get_bits(gb, 8);
87 }
88 14056 }
89
90 /**
91 * Decode 4x4 block
92 */
93 17028 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
94 {
95 int i, j, v[2];
96
97
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17028 switch (get_bits(gb, 2)) {
98 139 case 1:
99 139 v[0] = get_bits(gb, 8);
100
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695 for (j = 0; j < 4; j++)
101 556 memset(dst + j * linesize, v[0], 4);
102 139 break;
103 11062 case 2:
104 11062 v[0] = get_bits(gb, 8);
105 11062 v[1] = get_bits(gb, 8);
106
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33186 for (j = 2; j >= 0; j -= 2) {
107
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110620 for (i = 0; i < 4; i++)
108 88496 dst[j * linesize + i] = v[get_bits1(gb)];
109
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110620 for (i = 0; i < 4; i++)
110 88496 dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
111 }
112 11062 break;
113 3514 case 3:
114
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10542 for (j = 0; j < 4; j += 2)
115
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21084 for (i = 0; i < 4; i += 2)
116 14056 decode2x2(gb, dst + j * linesize + i, linesize);
117 }
118 17028 }
119
120 /**
121 * Decode 8x8 block
122 */
123 6000 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
124 BlockDSPContext *bdsp)
125 {
126 int i, j, v[2];
127
128
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6000 switch (get_bits(gb, 2)) {
129 29 case 1:
130 29 v[0] = get_bits(gb, 8);
131 29 bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
132 29 break;
133 218 case 2:
134 218 v[0] = get_bits(gb, 8);
135 218 v[1] = get_bits(gb, 8);
136
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1962 for (j = 7; j >= 0; j--)
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15696 for (i = 0; i < 8; i++)
138 13952 dst[j * linesize + i] = v[get_bits1(gb)];
139 218 break;
140 4257 case 3:
141
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12771 for (j = 0; j < 8; j += 4)
142
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25542 for (i = 0; i < 8; i += 4)
143 17028 decode4x4(gb, dst + j * linesize + i, linesize);
144 }
145 6000 }
146
147 9 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
148 int *got_frame, AVPacket *avpkt)
149 {
150 9 JvContext *s = avctx->priv_data;
151 9 const uint8_t *buf = avpkt->data;
152 9 const uint8_t *buf_end = buf + avpkt->size;
153 int video_size, video_type, i, j, ret;
154
155
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9 if (avpkt->size < 6)
156 return AVERROR_INVALIDDATA;
157
158 9 video_size = AV_RL32(buf);
159 9 video_type = buf[4];
160 9 buf += 5;
161
162
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9 if (video_size) {
163
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8 if (video_size < 0 || video_size > avpkt->size - 5) {
164 1 av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
165 1 return AVERROR_INVALIDDATA;
166 }
167
168
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7 if (video_type == 0 || video_type == 1) {
169 GetBitContext gb;
170 6 init_get_bits(&gb, buf, 8 * video_size);
171
172
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6 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
173 return ret;
174
175
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6 if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
176 av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
177 return AVERROR_INVALIDDATA;
178 }
179
180
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156 for (j = 0; j < avctx->height; j += 8)
181
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6150 for (i = 0; i < avctx->width; i += 8)
182 6000 decode8x8(&gb,
183 6000 s->frame->data[0] + j * s->frame->linesize[0] + i,
184 6000 s->frame->linesize[0], &s->bdsp);
185
186 6 buf += video_size;
187
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1 } else if (video_type == 2) {
188 1 int v = *buf++;
189
190 1 av_frame_unref(s->frame);
191
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1 if ((ret = ff_get_buffer(avctx, s->frame, AV_GET_BUFFER_FLAG_REF)) < 0)
192 return ret;
193
194
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201 for (j = 0; j < avctx->height; j++)
195 200 memset(s->frame->data[0] + j * s->frame->linesize[0],
196 200 v, avctx->width);
197 } else {
198 av_log(avctx, AV_LOG_WARNING,
199 "unsupported frame type %i\n", video_type);
200 return AVERROR_INVALIDDATA;
201 }
202 }
203
204
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8 if (buf_end - buf >= AVPALETTE_COUNT * 3) {
205
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257 for (i = 0; i < AVPALETTE_COUNT; i++) {
206 256 uint32_t pal = AV_RB24(buf);
207 256 s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
208 256 buf += 3;
209 }
210 1 s->palette_has_changed = 1;
211 }
212
213
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8 if (video_size) {
214 7 s->frame->key_frame = 1;
215 7 s->frame->pict_type = AV_PICTURE_TYPE_I;
216 7 s->frame->palette_has_changed = s->palette_has_changed;
217 7 s->palette_has_changed = 0;
218 7 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
219
220
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7 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
221 return ret;
222 7 *got_frame = 1;
223 }
224
225 8 return avpkt->size;
226 }
227
228 3 static av_cold int decode_close(AVCodecContext *avctx)
229 {
230 3 JvContext *s = avctx->priv_data;
231
232 3 av_frame_free(&s->frame);
233
234 3 return 0;
235 }
236
237 const FFCodec ff_jv_decoder = {
238 .p.name = "jv",
239 .p.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
240 .p.type = AVMEDIA_TYPE_VIDEO,
241 .p.id = AV_CODEC_ID_JV,
242 .priv_data_size = sizeof(JvContext),
243 .init = decode_init,
244 .close = decode_close,
245 FF_CODEC_DECODE_CB(decode_frame),
246 .p.capabilities = AV_CODEC_CAP_DR1,
247 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
248 };
249