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2ba45a60 DM |
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; | |
2ba45a60 DM |
57 | |
58 | if (width & 1) | |
59 | return AVERROR_INVALIDDATA; | |
60 | ||
61 | /* first line contain absolute values, other lines contain deltas */ | |
62 | while (out < width) { | |
f6fa7814 | 63 | int c = ir2_get_code(&ctx->gb); |
2ba45a60 DM |
64 | if (c >= 0x80) { /* we have a run */ |
65 | c -= 0x7F; | |
66 | if (out + c*2 > width) | |
67 | return AVERROR_INVALIDDATA; | |
68 | for (i = 0; i < c * 2; i++) | |
69 | dst[out++] = 0x80; | |
70 | } else { /* copy two values from table */ | |
71 | dst[out++] = table[c * 2]; | |
72 | dst[out++] = table[(c * 2) + 1]; | |
73 | } | |
74 | } | |
75 | dst += pitch; | |
76 | ||
77 | for (j = 1; j < height; j++) { | |
78 | out = 0; | |
79 | while (out < width) { | |
f6fa7814 | 80 | int c = ir2_get_code(&ctx->gb); |
2ba45a60 DM |
81 | if (c >= 0x80) { /* we have a skip */ |
82 | c -= 0x7F; | |
83 | if (out + c*2 > width) | |
84 | return AVERROR_INVALIDDATA; | |
85 | for (i = 0; i < c * 2; i++) { | |
86 | dst[out] = dst[out - pitch]; | |
87 | out++; | |
88 | } | |
89 | } else { /* add two deltas from table */ | |
f6fa7814 | 90 | int t = dst[out - pitch] + (table[c * 2] - 128); |
2ba45a60 DM |
91 | t = av_clip_uint8(t); |
92 | dst[out] = t; | |
93 | out++; | |
94 | t = dst[out - pitch] + (table[(c * 2) + 1] - 128); | |
95 | t = av_clip_uint8(t); | |
96 | dst[out] = t; | |
97 | out++; | |
98 | } | |
99 | } | |
100 | dst += pitch; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, | |
106 | int pitch, const uint8_t *table) | |
107 | { | |
108 | int j; | |
109 | int out = 0; | |
110 | int c; | |
111 | int t; | |
112 | ||
113 | if (width & 1) | |
114 | return AVERROR_INVALIDDATA; | |
115 | ||
116 | for (j = 0; j < height; j++) { | |
117 | out = 0; | |
118 | while (out < width) { | |
119 | c = ir2_get_code(&ctx->gb); | |
120 | if (c >= 0x80) { /* we have a skip */ | |
121 | c -= 0x7F; | |
122 | out += c * 2; | |
123 | } else { /* add two deltas from table */ | |
124 | t = dst[out] + (((table[c * 2] - 128)*3) >> 2); | |
125 | t = av_clip_uint8(t); | |
126 | dst[out] = t; | |
127 | out++; | |
128 | t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2); | |
129 | t = av_clip_uint8(t); | |
130 | dst[out] = t; | |
131 | out++; | |
132 | } | |
133 | } | |
134 | dst += pitch; | |
135 | } | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static int ir2_decode_frame(AVCodecContext *avctx, | |
140 | void *data, int *got_frame, | |
141 | AVPacket *avpkt) | |
142 | { | |
143 | Ir2Context * const s = avctx->priv_data; | |
144 | const uint8_t *buf = avpkt->data; | |
145 | int buf_size = avpkt->size; | |
146 | AVFrame *picture = data; | |
147 | AVFrame * const p = s->picture; | |
148 | int start, ret; | |
149 | ||
150 | if ((ret = ff_reget_buffer(avctx, p)) < 0) | |
151 | return ret; | |
152 | ||
153 | start = 48; /* hardcoded for now */ | |
154 | ||
155 | if (start >= buf_size) { | |
156 | av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size); | |
157 | return AVERROR_INVALIDDATA; | |
158 | } | |
159 | ||
160 | s->decode_delta = buf[18]; | |
161 | ||
162 | /* decide whether frame uses deltas or not */ | |
163 | #ifndef BITSTREAM_READER_LE | |
164 | for (i = 0; i < buf_size; i++) | |
165 | buf[i] = ff_reverse[buf[i]]; | |
166 | #endif | |
167 | ||
168 | init_get_bits(&s->gb, buf + start, (buf_size - start) * 8); | |
169 | ||
170 | if (s->decode_delta) { /* intraframe */ | |
171 | if ((ret = ir2_decode_plane(s, avctx->width, avctx->height, | |
172 | p->data[0], p->linesize[0], | |
173 | ir2_luma_table)) < 0) | |
174 | return ret; | |
175 | ||
176 | /* swapped U and V */ | |
177 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, | |
178 | p->data[2], p->linesize[2], | |
179 | ir2_luma_table)) < 0) | |
180 | return ret; | |
181 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, | |
182 | p->data[1], p->linesize[1], | |
183 | ir2_luma_table)) < 0) | |
184 | return ret; | |
185 | } else { /* interframe */ | |
186 | if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height, | |
187 | p->data[0], p->linesize[0], | |
188 | ir2_luma_table)) < 0) | |
189 | return ret; | |
190 | /* swapped U and V */ | |
191 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, | |
192 | p->data[2], p->linesize[2], | |
193 | ir2_luma_table)) < 0) | |
194 | return ret; | |
195 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, | |
196 | p->data[1], p->linesize[1], | |
197 | ir2_luma_table)) < 0) | |
198 | return ret; | |
199 | } | |
200 | ||
201 | if ((ret = av_frame_ref(picture, p)) < 0) | |
202 | return ret; | |
203 | ||
204 | *got_frame = 1; | |
205 | ||
206 | return buf_size; | |
207 | } | |
208 | ||
209 | static av_cold int ir2_decode_init(AVCodecContext *avctx) | |
210 | { | |
211 | Ir2Context * const ic = avctx->priv_data; | |
212 | static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2]; | |
213 | ||
214 | ic->avctx = avctx; | |
215 | ||
216 | avctx->pix_fmt= AV_PIX_FMT_YUV410P; | |
217 | ||
218 | ic->picture = av_frame_alloc(); | |
219 | if (!ic->picture) | |
220 | return AVERROR(ENOMEM); | |
221 | ||
222 | ir2_vlc.table = vlc_tables; | |
223 | ir2_vlc.table_allocated = 1 << CODE_VLC_BITS; | |
224 | #ifdef BITSTREAM_READER_LE | |
225 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, | |
226 | &ir2_codes[0][1], 4, 2, | |
227 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE); | |
228 | #else | |
229 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, | |
230 | &ir2_codes[0][1], 4, 2, | |
231 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC); | |
232 | #endif | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static av_cold int ir2_decode_end(AVCodecContext *avctx) | |
238 | { | |
239 | Ir2Context * const ic = avctx->priv_data; | |
240 | ||
241 | av_frame_free(&ic->picture); | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | AVCodec ff_indeo2_decoder = { | |
247 | .name = "indeo2", | |
248 | .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"), | |
249 | .type = AVMEDIA_TYPE_VIDEO, | |
250 | .id = AV_CODEC_ID_INDEO2, | |
251 | .priv_data_size = sizeof(Ir2Context), | |
252 | .init = ir2_decode_init, | |
253 | .close = ir2_decode_end, | |
254 | .decode = ir2_decode_frame, | |
255 | .capabilities = CODEC_CAP_DR1, | |
256 | }; |