2 * LucasArts VIMA decoder
3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/channel_layout.h"
26 #include "adpcm_data.h"
28 static int predict_table_init = 0;
29 static uint16_t predict_table[5786 * 2];
31 static const uint8_t size_table[] =
33 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
34 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
35 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
36 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
37 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
38 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
41 static const int8_t index_table1[] =
46 static const int8_t index_table2[] =
48 -1, -1, 2, 6, -1, -1, 2, 6
51 static const int8_t index_table3[] =
53 -1, -1, -1, -1, 1, 2, 4, 6,
54 -1, -1, -1, -1, 1, 2, 4, 6
57 static const int8_t index_table4[] =
59 -1, -1, -1, -1, -1, -1, -1, -1,
60 1, 1, 1, 2, 2, 4, 5, 6,
61 -1, -1, -1, -1, -1, -1, -1, -1,
62 1, 1, 1, 2, 2, 4, 5, 6
65 static const int8_t index_table5[] =
67 -1, -1, -1, -1, -1, -1, -1, -1,
68 -1, -1, -1, -1, -1, -1, -1, -1,
69 1, 1, 1, 1, 1, 2, 2, 2,
70 2, 4, 4, 4, 5, 5, 6, 6,
71 -1, -1, -1, -1, -1, -1, -1, -1,
72 -1, -1, -1, -1, -1, -1, -1, -1,
73 1, 1, 1, 1, 1, 2, 2, 2,
74 2, 4, 4, 4, 5, 5, 6, 6
77 static const int8_t index_table6[] =
79 -1, -1, -1, -1, -1, -1, -1, -1,
80 -1, -1, -1, -1, -1, -1, -1, -1,
81 -1, -1, -1, -1, -1, -1, -1, -1,
82 -1, -1, -1, -1, -1, -1, -1, -1,
83 1, 1, 1, 1, 1, 1, 1, 1,
84 1, 1, 2, 2, 2, 2, 2, 2,
85 2, 2, 4, 4, 4, 4, 4, 4,
86 5, 5, 5, 5, 6, 6, 6, 6,
87 -1, -1, -1, -1, -1, -1, -1, -1,
88 -1, -1, -1, -1, -1, -1, -1, -1,
89 -1, -1, -1, -1, -1, -1, -1, -1,
90 -1, -1, -1, -1, -1, -1, -1, -1,
91 1, 1, 1, 1, 1, 1, 1, 1,
92 1, 1, 2, 2, 2, 2, 2, 2,
93 2, 2, 4, 4, 4, 4, 4, 4,
94 5, 5, 5, 5, 6, 6, 6, 6
97 static const int8_t* const step_index_tables[] =
99 index_table1, index_table2, index_table3,
100 index_table4, index_table5, index_table6
103 static av_cold int decode_init(AVCodecContext *avctx)
107 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
109 if (predict_table_init)
112 for (start_pos = 0; start_pos < 64; start_pos++) {
113 unsigned int dest_pos, table_pos;
115 for (table_pos = 0, dest_pos = start_pos;
116 table_pos < FF_ARRAY_ELEMS(ff_adpcm_step_table);
117 table_pos++, dest_pos += 64) {
118 int put = 0, count, table_value;
120 table_value = ff_adpcm_step_table[table_pos];
121 for (count = 32; count != 0; count >>= 1) {
122 if (start_pos & count)
126 predict_table[dest_pos] = put;
129 predict_table_init = 1;
134 static int decode_frame(AVCodecContext *avctx, void *data,
135 int *got_frame_ptr, AVPacket *pkt)
138 AVFrame *frame = data;
141 int8_t channel_hint[2];
142 int ret, chan, channels = 1;
145 return AVERROR_INVALIDDATA;
147 if ((ret = init_get_bits8(&gb, pkt->data, pkt->size)) < 0)
150 samples = get_bits_long(&gb, 32);
151 if (samples == 0xffffffff) {
152 skip_bits_long(&gb, 32);
153 samples = get_bits_long(&gb, 32);
156 if (samples > pkt->size * 2)
157 return AVERROR_INVALIDDATA;
159 channel_hint[0] = get_sbits(&gb, 8);
160 if (channel_hint[0] & 0x80) {
161 channel_hint[0] = ~channel_hint[0];
164 avctx->channels = channels;
165 avctx->channel_layout = (channels == 2) ? AV_CH_LAYOUT_STEREO :
167 pcm_data[0] = get_sbits(&gb, 16);
169 channel_hint[1] = get_sbits(&gb, 8);
170 pcm_data[1] = get_sbits(&gb, 16);
173 frame->nb_samples = samples;
174 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
177 for (chan = 0; chan < channels; chan++) {
178 uint16_t *dest = (uint16_t*)frame->data[0] + chan;
179 int step_index = channel_hint[chan];
180 int output = pcm_data[chan];
183 for (sample = 0; sample < samples; sample++) {
184 int lookup_size, lookup, highbit, lowbits;
186 step_index = av_clip(step_index, 0, 88);
187 lookup_size = size_table[step_index];
188 lookup = get_bits(&gb, lookup_size);
189 highbit = 1 << (lookup_size - 1);
190 lowbits = highbit - 1;
192 if (lookup & highbit)
197 if (lookup == lowbits) {
198 output = get_sbits(&gb, 16);
200 int predict_index, diff;
202 predict_index = (lookup << (7 - lookup_size)) | (step_index << 6);
203 predict_index = av_clip(predict_index, 0, 5785);
204 diff = predict_table[predict_index];
206 diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1);
210 output = av_clip_int16(output + diff);
216 step_index += step_index_tables[lookup_size - 2][lookup];
225 AVCodec ff_vima_decoder = {
227 .type = AVMEDIA_TYPE_AUDIO,
228 .id = AV_CODEC_ID_VIMA,
230 .decode = decode_frame,
231 .capabilities = CODEC_CAP_DR1,
232 .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),