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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 | 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); | |
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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29952 | for (j = 0; j < 2; j++) |
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--) |
137 |
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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 | CODEC_LONG_NAME("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 | }; | ||
248 |