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"
30 uint16_t predict_table[5786 * 2];
33 static const uint8_t size_table[] =
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 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
38 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
39 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
40 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
43 static const int8_t index_table1[] =
48 static const int8_t index_table2[] =
50 -1, -1, 2, 6, -1, -1, 2, 6
53 static const int8_t index_table3[] =
55 -1, -1, -1, -1, 1, 2, 4, 6,
56 -1, -1, -1, -1, 1, 2, 4, 6
59 static const int8_t index_table4[] =
61 -1, -1, -1, -1, -1, -1, -1, -1,
62 1, 1, 1, 2, 2, 4, 5, 6,
63 -1, -1, -1, -1, -1, -1, -1, -1,
64 1, 1, 1, 2, 2, 4, 5, 6
67 static const int8_t index_table5[] =
69 -1, -1, -1, -1, -1, -1, -1, -1,
70 -1, -1, -1, -1, -1, -1, -1, -1,
71 1, 1, 1, 1, 1, 2, 2, 2,
72 2, 4, 4, 4, 5, 5, 6, 6,
73 -1, -1, -1, -1, -1, -1, -1, -1,
74 -1, -1, -1, -1, -1, -1, -1, -1,
75 1, 1, 1, 1, 1, 2, 2, 2,
76 2, 4, 4, 4, 5, 5, 6, 6
79 static const int8_t index_table6[] =
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, 1, 1, 1, 1, 1, 1,
86 1, 1, 2, 2, 2, 2, 2, 2,
87 2, 2, 4, 4, 4, 4, 4, 4,
88 5, 5, 5, 5, 6, 6, 6, 6,
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, 1, 1, 1, 1, 1, 1,
94 1, 1, 2, 2, 2, 2, 2, 2,
95 2, 2, 4, 4, 4, 4, 4, 4,
96 5, 5, 5, 5, 6, 6, 6, 6
99 static const int8_t* const step_index_tables[] =
101 index_table1, index_table2, index_table3,
102 index_table4, index_table5, index_table6
105 static av_cold int decode_init(AVCodecContext *avctx)
107 VimaContext *vima = avctx->priv_data;
110 for (start_pos = 0; start_pos < 64; start_pos++) {
111 unsigned int dest_pos, table_pos;
113 for (table_pos = 0, dest_pos = start_pos;
114 table_pos < FF_ARRAY_ELEMS(ff_adpcm_step_table);
115 table_pos++, dest_pos += 64) {
116 int put = 0, count, table_value;
118 table_value = ff_adpcm_step_table[table_pos];
119 for (count = 32; count != 0; count >>= 1) {
120 if (start_pos & count)
124 vima->predict_table[dest_pos] = put;
128 avcodec_get_frame_defaults(&vima->frame);
129 avctx->coded_frame = &vima->frame;
130 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
135 static int decode_frame(AVCodecContext *avctx, void *data,
136 int *got_frame_ptr, AVPacket *pkt)
139 VimaContext *vima = avctx->priv_data;
142 int8_t channel_hint[2];
143 int ret, chan, channels = 1;
146 return AVERROR_INVALIDDATA;
148 init_get_bits(&gb, pkt->data, pkt->size * 8);
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 vima->frame.nb_samples = samples;
174 if ((ret = ff_get_buffer(avctx, &vima->frame)) < 0) {
175 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
179 for (chan = 0; chan < channels; chan++) {
180 uint16_t *dest = (uint16_t*)vima->frame.data[0] + chan;
181 int step_index = channel_hint[chan];
182 int output = pcm_data[chan];
185 for (sample = 0; sample < samples; sample++) {
186 int lookup_size, lookup, highbit, lowbits;
188 step_index = av_clip(step_index, 0, 88);
189 lookup_size = size_table[step_index];
190 lookup = get_bits(&gb, lookup_size);
191 highbit = 1 << (lookup_size - 1);
192 lowbits = highbit - 1;
194 if (lookup & highbit)
199 if (lookup == lowbits) {
200 output = get_sbits(&gb, 16);
202 int predict_index, diff;
204 predict_index = (lookup << (7 - lookup_size)) | (step_index << 6);
205 predict_index = av_clip(predict_index, 0, 5785);
206 diff = vima->predict_table[predict_index];
208 diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1);
212 output = av_clip_int16(output + diff);
218 step_index += step_index_tables[lookup_size - 2][lookup];
223 *(AVFrame *)data = vima->frame;
228 AVCodec ff_vima_decoder = {
230 .type = AVMEDIA_TYPE_AUDIO,
231 .id = AV_CODEC_ID_VIMA,
232 .priv_data_size = sizeof(VimaContext),
234 .decode = decode_frame,
235 .capabilities = CODEC_CAP_DR1,
236 .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),