Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 "get_bits.h" | |
33 | #include "internal.h" | |
34 | ||
35 | typedef struct JvContext { | |
36 | BlockDSPContext bdsp; | |
37 | AVFrame *frame; | |
38 | uint32_t palette[AVPALETTE_COUNT]; | |
39 | int palette_has_changed; | |
40 | } JvContext; | |
41 | ||
42 | static av_cold int decode_init(AVCodecContext *avctx) | |
43 | { | |
44 | JvContext *s = avctx->priv_data; | |
45 | ||
092a9121 DM |
46 | if (!avctx->width || !avctx->height || |
47 | (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 | ||
2ba45a60 DM |
53 | s->frame = av_frame_alloc(); |
54 | if (!s->frame) | |
55 | return AVERROR(ENOMEM); | |
56 | ||
57 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
58 | ff_blockdsp_init(&s->bdsp, avctx); | |
59 | return 0; | |
60 | } | |
61 | ||
62 | /** | |
63 | * Decode 2x2 block | |
64 | */ | |
65 | static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize) | |
66 | { | |
67 | int i, j, v[2]; | |
68 | ||
69 | switch (get_bits(gb, 2)) { | |
70 | case 1: | |
71 | v[0] = get_bits(gb, 8); | |
72 | for (j = 0; j < 2; j++) | |
73 | memset(dst + j * linesize, v[0], 2); | |
74 | break; | |
75 | case 2: | |
76 | v[0] = get_bits(gb, 8); | |
77 | v[1] = get_bits(gb, 8); | |
78 | for (j = 0; j < 2; j++) | |
79 | for (i = 0; i < 2; i++) | |
80 | dst[j * linesize + i] = v[get_bits1(gb)]; | |
81 | break; | |
82 | case 3: | |
83 | for (j = 0; j < 2; j++) | |
84 | for (i = 0; i < 2; i++) | |
85 | dst[j * linesize + i] = get_bits(gb, 8); | |
86 | } | |
87 | } | |
88 | ||
89 | /** | |
90 | * Decode 4x4 block | |
91 | */ | |
92 | static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize) | |
93 | { | |
94 | int i, j, v[2]; | |
95 | ||
96 | switch (get_bits(gb, 2)) { | |
97 | case 1: | |
98 | v[0] = get_bits(gb, 8); | |
99 | for (j = 0; j < 4; j++) | |
100 | memset(dst + j * linesize, v[0], 4); | |
101 | break; | |
102 | case 2: | |
103 | v[0] = get_bits(gb, 8); | |
104 | v[1] = get_bits(gb, 8); | |
105 | for (j = 2; j >= 0; j -= 2) { | |
106 | for (i = 0; i < 4; i++) | |
107 | dst[j * linesize + i] = v[get_bits1(gb)]; | |
108 | for (i = 0; i < 4; i++) | |
109 | dst[(j + 1) * linesize + i] = v[get_bits1(gb)]; | |
110 | } | |
111 | break; | |
112 | case 3: | |
113 | for (j = 0; j < 4; j += 2) | |
114 | for (i = 0; i < 4; i += 2) | |
115 | decode2x2(gb, dst + j * linesize + i, linesize); | |
116 | } | |
117 | } | |
118 | ||
119 | /** | |
120 | * Decode 8x8 block | |
121 | */ | |
122 | static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, | |
123 | BlockDSPContext *bdsp) | |
124 | { | |
125 | int i, j, v[2]; | |
126 | ||
127 | switch (get_bits(gb, 2)) { | |
128 | case 1: | |
129 | v[0] = get_bits(gb, 8); | |
130 | bdsp->fill_block_tab[1](dst, v[0], linesize, 8); | |
131 | break; | |
132 | case 2: | |
133 | v[0] = get_bits(gb, 8); | |
134 | v[1] = get_bits(gb, 8); | |
135 | for (j = 7; j >= 0; j--) | |
136 | for (i = 0; i < 8; i++) | |
137 | dst[j * linesize + i] = v[get_bits1(gb)]; | |
138 | break; | |
139 | case 3: | |
140 | for (j = 0; j < 8; j += 4) | |
141 | for (i = 0; i < 8; i += 4) | |
142 | decode4x4(gb, dst + j * linesize + i, linesize); | |
143 | } | |
144 | } | |
145 | ||
146 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
147 | AVPacket *avpkt) | |
148 | { | |
149 | JvContext *s = avctx->priv_data; | |
150 | const uint8_t *buf = avpkt->data; | |
151 | const uint8_t *buf_end = buf + avpkt->size; | |
152 | int video_size, video_type, i, j, ret; | |
153 | ||
154 | if (avpkt->size < 6) | |
155 | return AVERROR_INVALIDDATA; | |
156 | ||
157 | video_size = AV_RL32(buf); | |
158 | video_type = buf[4]; | |
159 | buf += 5; | |
160 | ||
161 | if (video_size) { | |
162 | if (video_size < 0 || video_size > avpkt->size - 5) { | |
163 | av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size); | |
164 | return AVERROR_INVALIDDATA; | |
165 | } | |
166 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) | |
167 | return ret; | |
168 | ||
169 | if (video_type == 0 || video_type == 1) { | |
170 | GetBitContext gb; | |
171 | init_get_bits(&gb, buf, 8 * video_size); | |
172 | ||
173 | for (j = 0; j < avctx->height; j += 8) | |
174 | for (i = 0; i < avctx->width; i += 8) | |
175 | decode8x8(&gb, | |
176 | s->frame->data[0] + j * s->frame->linesize[0] + i, | |
177 | s->frame->linesize[0], &s->bdsp); | |
178 | ||
179 | buf += video_size; | |
180 | } else if (video_type == 2) { | |
181 | int v = *buf++; | |
182 | for (j = 0; j < avctx->height; j++) | |
183 | memset(s->frame->data[0] + j * s->frame->linesize[0], | |
184 | v, avctx->width); | |
185 | } else { | |
186 | av_log(avctx, AV_LOG_WARNING, | |
187 | "unsupported frame type %i\n", video_type); | |
188 | return AVERROR_INVALIDDATA; | |
189 | } | |
190 | } | |
191 | ||
192 | if (buf_end - buf >= AVPALETTE_COUNT * 3) { | |
193 | for (i = 0; i < AVPALETTE_COUNT; i++) { | |
194 | uint32_t pal = AV_RB24(buf); | |
195 | s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303); | |
196 | buf += 3; | |
197 | } | |
198 | s->palette_has_changed = 1; | |
199 | } | |
200 | ||
201 | if (video_size) { | |
202 | s->frame->key_frame = 1; | |
203 | s->frame->pict_type = AV_PICTURE_TYPE_I; | |
204 | s->frame->palette_has_changed = s->palette_has_changed; | |
205 | s->palette_has_changed = 0; | |
206 | memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); | |
207 | ||
208 | if ((ret = av_frame_ref(data, s->frame)) < 0) | |
209 | return ret; | |
210 | *got_frame = 1; | |
211 | } | |
212 | ||
213 | return avpkt->size; | |
214 | } | |
215 | ||
216 | static av_cold int decode_close(AVCodecContext *avctx) | |
217 | { | |
218 | JvContext *s = avctx->priv_data; | |
219 | ||
220 | av_frame_free(&s->frame); | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | AVCodec ff_jv_decoder = { | |
226 | .name = "jv", | |
227 | .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"), | |
228 | .type = AVMEDIA_TYPE_VIDEO, | |
229 | .id = AV_CODEC_ID_JV, | |
230 | .priv_data_size = sizeof(JvContext), | |
231 | .init = decode_init, | |
232 | .close = decode_close, | |
233 | .decode = decode_frame, | |
234 | .capabilities = CODEC_CAP_DR1, | |
235 | }; |