blob: cbe83d3c108d10a686eb91fdc5a779110d08f39a
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 | |
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 | |
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 = AV_CODEC_CAP_DR1, |
235 | }; |
236 |