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"
29 uint16_t predict_table[5786 * 2];
32 static const uint8_t size_table[] =
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 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
37 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
38 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
39 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
42 static const int8_t index_table1[] =
47 static const int8_t index_table2[] =
49 -1, -1, 2, 6, -1, -1, 2, 6
52 static const int8_t index_table3[] =
54 -1, -1, -1, -1, 1, 2, 4, 6,
55 -1, -1, -1, -1, 1, 2, 4, 6
58 static const int8_t index_table4[] =
60 -1, -1, -1, -1, -1, -1, -1, -1,
61 1, 1, 1, 2, 2, 4, 5, 6,
62 -1, -1, -1, -1, -1, -1, -1, -1,
63 1, 1, 1, 2, 2, 4, 5, 6
66 static const int8_t index_table5[] =
68 -1, -1, -1, -1, -1, -1, -1, -1,
69 -1, -1, -1, -1, -1, -1, -1, -1,
70 1, 1, 1, 1, 1, 2, 2, 2,
71 2, 4, 4, 4, 5, 5, 6, 6,
72 -1, -1, -1, -1, -1, -1, -1, -1,
73 -1, -1, -1, -1, -1, -1, -1, -1,
74 1, 1, 1, 1, 1, 2, 2, 2,
75 2, 4, 4, 4, 5, 5, 6, 6
78 static const int8_t index_table6[] =
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, 1, 1, 1, 1, 1, 1,
85 1, 1, 2, 2, 2, 2, 2, 2,
86 2, 2, 4, 4, 4, 4, 4, 4,
87 5, 5, 5, 5, 6, 6, 6, 6,
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, 1, 1, 1, 1, 1, 1,
93 1, 1, 2, 2, 2, 2, 2, 2,
94 2, 2, 4, 4, 4, 4, 4, 4,
95 5, 5, 5, 5, 6, 6, 6, 6
98 static const int8_t* const step_index_tables[] =
100 index_table1, index_table2, index_table3,
101 index_table4, index_table5, index_table6
104 static av_cold int decode_init(AVCodecContext *avctx)
106 VimaContext *vima = avctx->priv_data;
109 for (start_pos = 0; start_pos < 64; start_pos++) {
110 unsigned int dest_pos, table_pos;
112 for (table_pos = 0, dest_pos = start_pos;
113 table_pos < FF_ARRAY_ELEMS(ff_adpcm_step_table);
114 table_pos++, dest_pos += 64) {
115 int put = 0, count, table_value;
117 table_value = ff_adpcm_step_table[table_pos];
118 for (count = 32; count != 0; count >>= 1) {
119 if (start_pos & count)
123 vima->predict_table[dest_pos] = put;
127 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
132 static int decode_frame(AVCodecContext *avctx, void *data,
133 int *got_frame_ptr, AVPacket *pkt)
136 VimaContext *vima = avctx->priv_data;
137 AVFrame *frame = data;
140 int8_t channel_hint[2];
141 int ret, chan, channels = 1;
144 return AVERROR_INVALIDDATA;
146 if ((ret = init_get_bits8(&gb, pkt->data, pkt->size)) < 0)
149 samples = get_bits_long(&gb, 32);
150 if (samples == 0xffffffff) {
151 skip_bits_long(&gb, 32);
152 samples = get_bits_long(&gb, 32);
155 if (samples > pkt->size * 2)
156 return AVERROR_INVALIDDATA;
158 channel_hint[0] = get_sbits(&gb, 8);
159 if (channel_hint[0] & 0x80) {
160 channel_hint[0] = ~channel_hint[0];
163 avctx->channels = channels;
164 avctx->channel_layout = (channels == 2) ? AV_CH_LAYOUT_STEREO :
166 pcm_data[0] = get_sbits(&gb, 16);
168 channel_hint[1] = get_sbits(&gb, 8);
169 pcm_data[1] = get_sbits(&gb, 16);
172 frame->nb_samples = samples;
173 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
176 for (chan = 0; chan < channels; chan++) {
177 uint16_t *dest = (uint16_t*)frame->data[0] + chan;
178 int step_index = channel_hint[chan];
179 int output = pcm_data[chan];
182 for (sample = 0; sample < samples; sample++) {
183 int lookup_size, lookup, highbit, lowbits;
185 step_index = av_clip(step_index, 0, 88);
186 lookup_size = size_table[step_index];
187 lookup = get_bits(&gb, lookup_size);
188 highbit = 1 << (lookup_size - 1);
189 lowbits = highbit - 1;
191 if (lookup & highbit)
196 if (lookup == lowbits) {
197 output = get_sbits(&gb, 16);
199 int predict_index, diff;
201 predict_index = (lookup << (7 - lookup_size)) | (step_index << 6);
202 predict_index = av_clip(predict_index, 0, 5785);
203 diff = vima->predict_table[predict_index];
205 diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1);
209 output = av_clip_int16(output + diff);
215 step_index += step_index_tables[lookup_size - 2][lookup];
224 AVCodec ff_vima_decoder = {
226 .type = AVMEDIA_TYPE_AUDIO,
227 .id = AV_CODEC_ID_VIMA,
228 .priv_data_size = sizeof(VimaContext),
230 .decode = decode_frame,
231 .capabilities = CODEC_CAP_DR1,
232 .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),