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1 | /* |
2 | * Intel Indeo 2 codec | |
3 | * Copyright (c) 2005 Konstantin Shishkov | |
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 | * Intel Indeo 2 decoder. | |
25 | */ | |
26 | ||
27 | #define BITSTREAM_READER_LE | |
28 | #include "libavutil/attributes.h" | |
29 | #include "avcodec.h" | |
30 | #include "get_bits.h" | |
31 | #include "indeo2data.h" | |
32 | #include "internal.h" | |
33 | #include "mathops.h" | |
34 | ||
35 | typedef struct Ir2Context{ | |
36 | AVCodecContext *avctx; | |
37 | AVFrame *picture; | |
38 | GetBitContext gb; | |
39 | int decode_delta; | |
40 | } Ir2Context; | |
41 | ||
42 | #define CODE_VLC_BITS 14 | |
43 | static VLC ir2_vlc; | |
44 | ||
45 | /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */ | |
46 | static inline int ir2_get_code(GetBitContext *gb) | |
47 | { | |
48 | return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1; | |
49 | } | |
50 | ||
51 | static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, | |
52 | int pitch, const uint8_t *table) | |
53 | { | |
54 | int i; | |
55 | int j; | |
56 | int out = 0; | |
57 | int c; | |
58 | int t; | |
59 | ||
60 | if (width & 1) | |
61 | return AVERROR_INVALIDDATA; | |
62 | ||
63 | /* first line contain absolute values, other lines contain deltas */ | |
64 | while (out < width) { | |
65 | c = ir2_get_code(&ctx->gb); | |
66 | if (c >= 0x80) { /* we have a run */ | |
67 | c -= 0x7F; | |
68 | if (out + c*2 > width) | |
69 | return AVERROR_INVALIDDATA; | |
70 | for (i = 0; i < c * 2; i++) | |
71 | dst[out++] = 0x80; | |
72 | } else { /* copy two values from table */ | |
73 | dst[out++] = table[c * 2]; | |
74 | dst[out++] = table[(c * 2) + 1]; | |
75 | } | |
76 | } | |
77 | dst += pitch; | |
78 | ||
79 | for (j = 1; j < height; j++) { | |
80 | out = 0; | |
81 | while (out < width) { | |
82 | c = ir2_get_code(&ctx->gb); | |
83 | if (c >= 0x80) { /* we have a skip */ | |
84 | c -= 0x7F; | |
85 | if (out + c*2 > width) | |
86 | return AVERROR_INVALIDDATA; | |
87 | for (i = 0; i < c * 2; i++) { | |
88 | dst[out] = dst[out - pitch]; | |
89 | out++; | |
90 | } | |
91 | } else { /* add two deltas from table */ | |
92 | t = dst[out - pitch] + (table[c * 2] - 128); | |
93 | t = av_clip_uint8(t); | |
94 | dst[out] = t; | |
95 | out++; | |
96 | t = dst[out - pitch] + (table[(c * 2) + 1] - 128); | |
97 | t = av_clip_uint8(t); | |
98 | dst[out] = t; | |
99 | out++; | |
100 | } | |
101 | } | |
102 | dst += pitch; | |
103 | } | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, | |
108 | int pitch, const uint8_t *table) | |
109 | { | |
110 | int j; | |
111 | int out = 0; | |
112 | int c; | |
113 | int t; | |
114 | ||
115 | if (width & 1) | |
116 | return AVERROR_INVALIDDATA; | |
117 | ||
118 | for (j = 0; j < height; j++) { | |
119 | out = 0; | |
120 | while (out < width) { | |
121 | c = ir2_get_code(&ctx->gb); | |
122 | if (c >= 0x80) { /* we have a skip */ | |
123 | c -= 0x7F; | |
124 | out += c * 2; | |
125 | } else { /* add two deltas from table */ | |
126 | t = dst[out] + (((table[c * 2] - 128)*3) >> 2); | |
127 | t = av_clip_uint8(t); | |
128 | dst[out] = t; | |
129 | out++; | |
130 | t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2); | |
131 | t = av_clip_uint8(t); | |
132 | dst[out] = t; | |
133 | out++; | |
134 | } | |
135 | } | |
136 | dst += pitch; | |
137 | } | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static int ir2_decode_frame(AVCodecContext *avctx, | |
142 | void *data, int *got_frame, | |
143 | AVPacket *avpkt) | |
144 | { | |
145 | Ir2Context * const s = avctx->priv_data; | |
146 | const uint8_t *buf = avpkt->data; | |
147 | int buf_size = avpkt->size; | |
148 | AVFrame *picture = data; | |
149 | AVFrame * const p = s->picture; | |
150 | int start, ret; | |
151 | ||
152 | if ((ret = ff_reget_buffer(avctx, p)) < 0) | |
153 | return ret; | |
154 | ||
155 | start = 48; /* hardcoded for now */ | |
156 | ||
157 | if (start >= buf_size) { | |
158 | av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size); | |
159 | return AVERROR_INVALIDDATA; | |
160 | } | |
161 | ||
162 | s->decode_delta = buf[18]; | |
163 | ||
164 | /* decide whether frame uses deltas or not */ | |
165 | #ifndef BITSTREAM_READER_LE | |
166 | for (i = 0; i < buf_size; i++) | |
167 | buf[i] = ff_reverse[buf[i]]; | |
168 | #endif | |
169 | ||
170 | init_get_bits(&s->gb, buf + start, (buf_size - start) * 8); | |
171 | ||
172 | if (s->decode_delta) { /* intraframe */ | |
173 | if ((ret = ir2_decode_plane(s, avctx->width, avctx->height, | |
174 | p->data[0], p->linesize[0], | |
175 | ir2_luma_table)) < 0) | |
176 | return ret; | |
177 | ||
178 | /* swapped U and V */ | |
179 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, | |
180 | p->data[2], p->linesize[2], | |
181 | ir2_luma_table)) < 0) | |
182 | return ret; | |
183 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, | |
184 | p->data[1], p->linesize[1], | |
185 | ir2_luma_table)) < 0) | |
186 | return ret; | |
187 | } else { /* interframe */ | |
188 | if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height, | |
189 | p->data[0], p->linesize[0], | |
190 | ir2_luma_table)) < 0) | |
191 | return ret; | |
192 | /* swapped U and V */ | |
193 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, | |
194 | p->data[2], p->linesize[2], | |
195 | ir2_luma_table)) < 0) | |
196 | return ret; | |
197 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, | |
198 | p->data[1], p->linesize[1], | |
199 | ir2_luma_table)) < 0) | |
200 | return ret; | |
201 | } | |
202 | ||
203 | if ((ret = av_frame_ref(picture, p)) < 0) | |
204 | return ret; | |
205 | ||
206 | *got_frame = 1; | |
207 | ||
208 | return buf_size; | |
209 | } | |
210 | ||
211 | static av_cold int ir2_decode_init(AVCodecContext *avctx) | |
212 | { | |
213 | Ir2Context * const ic = avctx->priv_data; | |
214 | static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2]; | |
215 | ||
216 | ic->avctx = avctx; | |
217 | ||
218 | avctx->pix_fmt= AV_PIX_FMT_YUV410P; | |
219 | ||
220 | ic->picture = av_frame_alloc(); | |
221 | if (!ic->picture) | |
222 | return AVERROR(ENOMEM); | |
223 | ||
224 | ir2_vlc.table = vlc_tables; | |
225 | ir2_vlc.table_allocated = 1 << CODE_VLC_BITS; | |
226 | #ifdef BITSTREAM_READER_LE | |
227 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, | |
228 | &ir2_codes[0][1], 4, 2, | |
229 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE); | |
230 | #else | |
231 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, | |
232 | &ir2_codes[0][1], 4, 2, | |
233 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC); | |
234 | #endif | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static av_cold int ir2_decode_end(AVCodecContext *avctx) | |
240 | { | |
241 | Ir2Context * const ic = avctx->priv_data; | |
242 | ||
243 | av_frame_free(&ic->picture); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | AVCodec ff_indeo2_decoder = { | |
249 | .name = "indeo2", | |
250 | .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"), | |
251 | .type = AVMEDIA_TYPE_VIDEO, | |
252 | .id = AV_CODEC_ID_INDEO2, | |
253 | .priv_data_size = sizeof(Ir2Context), | |
254 | .init = ir2_decode_init, | |
255 | .close = ir2_decode_end, | |
256 | .decode = ir2_decode_frame, | |
257 | .capabilities = CODEC_CAP_DR1, | |
258 | }; |