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1 | /* |
2 | * LucasArts VIMA decoder | |
3 | * Copyright (c) 2012 Paul B Mahol | |
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 | * LucasArts VIMA audio decoder | |
25 | * @author Paul B Mahol | |
26 | */ | |
27 | ||
28 | #include "libavutil/channel_layout.h" | |
29 | ||
30 | #include "adpcm_data.h" | |
31 | #include "avcodec.h" | |
32 | #include "get_bits.h" | |
33 | #include "internal.h" | |
34 | ||
35 | static int predict_table_init = 0; | |
36 | static uint16_t predict_table[5786 * 2]; | |
37 | ||
38 | static const uint8_t size_table[] = { | |
39 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, | |
40 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, | |
41 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, | |
42 | 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, | |
43 | 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, | |
44 | 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 | |
45 | }; | |
46 | ||
47 | static const int8_t index_table1[] = { | |
48 | -1, 4, -1, 4 | |
49 | }; | |
50 | ||
51 | static const int8_t index_table2[] = { | |
52 | -1, -1, 2, 6, -1, -1, 2, 6 | |
53 | }; | |
54 | ||
55 | static const int8_t index_table3[] = { | |
56 | -1, -1, -1, -1, 1, 2, 4, 6, -1, -1, -1, -1, 1, 2, 4, 6 | |
57 | }; | |
58 | ||
59 | static const int8_t index_table4[] = { | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 2, 2, 4, 5, 6, | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 2, 2, 4, 5, 6 | |
62 | }; | |
63 | ||
64 | static const int8_t index_table5[] = { | |
65 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | |
66 | 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 5, 5, 6, 6, | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | |
68 | 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 5, 5, 6, 6 | |
69 | }; | |
70 | ||
71 | static const int8_t index_table6[] = { | |
72 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | |
73 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | |
74 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, | |
75 | 2, 2, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, | |
76 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | |
77 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | |
78 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, | |
79 | 2, 2, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6 | |
80 | }; | |
81 | ||
82 | static const int8_t *const step_index_tables[] = { | |
83 | index_table1, index_table2, index_table3, | |
84 | index_table4, index_table5, index_table6 | |
85 | }; | |
86 | ||
87 | static av_cold int decode_init(AVCodecContext *avctx) | |
88 | { | |
89 | int start_pos; | |
90 | ||
91 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
92 | ||
93 | if (predict_table_init) | |
94 | return 0; | |
95 | ||
96 | for (start_pos = 0; start_pos < 64; start_pos++) { | |
97 | unsigned int dest_pos, table_pos; | |
98 | ||
99 | for (table_pos = 0, dest_pos = start_pos; | |
100 | table_pos < FF_ARRAY_ELEMS(ff_adpcm_step_table); | |
101 | table_pos++, dest_pos += 64) { | |
102 | int put = 0, count, table_value; | |
103 | ||
104 | table_value = ff_adpcm_step_table[table_pos]; | |
105 | for (count = 32; count != 0; count >>= 1) { | |
106 | if (start_pos & count) | |
107 | put += table_value; | |
108 | table_value >>= 1; | |
109 | } | |
110 | predict_table[dest_pos] = put; | |
111 | } | |
112 | } | |
113 | predict_table_init = 1; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static int decode_frame(AVCodecContext *avctx, void *data, | |
119 | int *got_frame_ptr, AVPacket *pkt) | |
120 | { | |
121 | GetBitContext gb; | |
122 | AVFrame *frame = data; | |
123 | int16_t pcm_data[2]; | |
124 | uint32_t samples; | |
125 | int8_t channel_hint[2]; | |
126 | int ret, chan; | |
127 | int channels = 1; | |
128 | ||
129 | if (pkt->size < 13) | |
130 | return AVERROR_INVALIDDATA; | |
131 | ||
132 | if ((ret = init_get_bits8(&gb, pkt->data, pkt->size)) < 0) | |
133 | return ret; | |
134 | ||
135 | samples = get_bits_long(&gb, 32); | |
136 | if (samples == 0xffffffff) { | |
137 | skip_bits_long(&gb, 32); | |
138 | samples = get_bits_long(&gb, 32); | |
139 | } | |
140 | ||
141 | if (samples > pkt->size * 2) | |
142 | return AVERROR_INVALIDDATA; | |
143 | ||
144 | channel_hint[0] = get_sbits(&gb, 8); | |
145 | if (channel_hint[0] & 0x80) { | |
146 | channel_hint[0] = ~channel_hint[0]; | |
147 | channels = 2; | |
148 | } | |
149 | avctx->channels = channels; | |
150 | avctx->channel_layout = (channels == 2) ? AV_CH_LAYOUT_STEREO | |
151 | : AV_CH_LAYOUT_MONO; | |
152 | pcm_data[0] = get_sbits(&gb, 16); | |
153 | if (channels > 1) { | |
154 | channel_hint[1] = get_sbits(&gb, 8); | |
155 | pcm_data[1] = get_sbits(&gb, 16); | |
156 | } | |
157 | ||
158 | frame->nb_samples = samples; | |
159 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
160 | return ret; | |
161 | ||
162 | for (chan = 0; chan < channels; chan++) { | |
163 | uint16_t *dest = (uint16_t *)frame->data[0] + chan; | |
164 | int step_index = channel_hint[chan]; | |
165 | int output = pcm_data[chan]; | |
166 | int sample; | |
167 | ||
168 | for (sample = 0; sample < samples; sample++) { | |
169 | int lookup_size, lookup, highbit, lowbits; | |
170 | ||
171 | step_index = av_clip(step_index, 0, 88); | |
172 | lookup_size = size_table[step_index]; | |
173 | lookup = get_bits(&gb, lookup_size); | |
174 | highbit = 1 << (lookup_size - 1); | |
175 | lowbits = highbit - 1; | |
176 | ||
177 | if (lookup & highbit) | |
178 | lookup ^= highbit; | |
179 | else | |
180 | highbit = 0; | |
181 | ||
182 | if (lookup == lowbits) { | |
183 | output = get_sbits(&gb, 16); | |
184 | } else { | |
185 | int predict_index, diff; | |
186 | ||
187 | predict_index = (lookup << (7 - lookup_size)) | (step_index << 6); | |
188 | predict_index = av_clip(predict_index, 0, 5785); | |
189 | diff = predict_table[predict_index]; | |
190 | if (lookup) | |
191 | diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1); | |
192 | if (highbit) | |
193 | diff = -diff; | |
194 | ||
195 | output = av_clip_int16(output + diff); | |
196 | } | |
197 | ||
198 | *dest = output; | |
199 | dest += channels; | |
200 | ||
201 | step_index += step_index_tables[lookup_size - 2][lookup]; | |
202 | } | |
203 | } | |
204 | ||
205 | *got_frame_ptr = 1; | |
206 | ||
207 | return pkt->size; | |
208 | } | |
209 | ||
210 | AVCodec ff_adpcm_vima_decoder = { | |
211 | .name = "adpcm_vima", | |
212 | .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"), | |
213 | .type = AVMEDIA_TYPE_AUDIO, | |
214 | .id = AV_CODEC_ID_ADPCM_VIMA, | |
215 | .init = decode_init, | |
216 | .decode = decode_frame, | |
217 | .capabilities = CODEC_CAP_DR1, | |
218 | }; | |
219 | ||
220 | AVCodec ff_vima_decoder = { | |
221 | .name = "vima", | |
222 | .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"), | |
223 | .type = AVMEDIA_TYPE_AUDIO, | |
224 | .id = AV_CODEC_ID_ADPCM_VIMA, | |
225 | .init = decode_init, | |
226 | .decode = decode_frame, | |
227 | .capabilities = CODEC_CAP_DR1, | |
228 | }; |