| b1835732 | /* |
| 06f5edc9 | * LucasArts VIMA decoder |
| b1835732 | * Copyright (c) 2012 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ |
| 2c5700c5 | /** * @file * LucasArts VIMA audio decoder * @author Paul B Mahol */ |
| 1acd2f6b | #include "libavutil/channel_layout.h" |
| b1835732 | #include "avcodec.h" #include "get_bits.h" |
| 874c5b02 | #include "internal.h" |
| b1835732 | #include "adpcm_data.h" |
| da227603 | static int predict_table_init = 0; static uint16_t predict_table[5786 * 2]; |
| b1835732 |
static const uint8_t size_table[] =
{
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
};
static const int8_t index_table1[] =
{
-1, 4, -1, 4
};
static const int8_t index_table2[] =
{
-1, -1, 2, 6, -1, -1, 2, 6
};
static const int8_t index_table3[] =
{
-1, -1, -1, -1, 1, 2, 4, 6,
-1, -1, -1, -1, 1, 2, 4, 6
};
static const int8_t index_table4[] =
{
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 2, 2, 4, 5, 6,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 2, 2, 4, 5, 6
};
static const int8_t index_table5[] =
{
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 2, 2, 2,
2, 4, 4, 4, 5, 5, 6, 6,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 2, 2, 2,
2, 4, 4, 4, 5, 5, 6, 6
};
static const int8_t index_table6[] =
{
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 2, 2,
2, 2, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 6, 6, 6, 6,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 2, 2,
2, 2, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 6, 6, 6, 6
};
static const int8_t* const step_index_tables[] =
{
index_table1, index_table2, index_table3,
index_table4, index_table5, index_table6
};
static av_cold int decode_init(AVCodecContext *avctx)
{ |
| da227603 |
int start_pos;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
if (predict_table_init)
return 0; |
| b1835732 |
for (start_pos = 0; start_pos < 64; start_pos++) {
unsigned int dest_pos, table_pos;
for (table_pos = 0, dest_pos = start_pos;
table_pos < FF_ARRAY_ELEMS(ff_adpcm_step_table);
table_pos++, dest_pos += 64) {
int put = 0, count, table_value;
table_value = ff_adpcm_step_table[table_pos];
for (count = 32; count != 0; count >>= 1) {
if (start_pos & count)
put += table_value;
table_value >>= 1;
} |
| da227603 |
predict_table[dest_pos] = put; |
| b1835732 |
}
} |
| da227603 |
predict_table_init = 1; |
| b1835732 |
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *pkt)
{
GetBitContext gb; |
| 9145818e |
AVFrame *frame = data; |
| b1835732 |
int16_t pcm_data[2];
uint32_t samples;
int8_t channel_hint[2];
int ret, chan, channels = 1;
if (pkt->size < 13)
return AVERROR_INVALIDDATA;
|
| 641bbd96 |
if ((ret = init_get_bits8(&gb, pkt->data, pkt->size)) < 0)
return ret; |
| 857797bc | |
| b1835732 |
samples = get_bits_long(&gb, 32);
if (samples == 0xffffffff) {
skip_bits_long(&gb, 32);
samples = get_bits_long(&gb, 32);
}
if (samples > pkt->size * 2)
return AVERROR_INVALIDDATA;
channel_hint[0] = get_sbits(&gb, 8);
if (channel_hint[0] & 0x80) {
channel_hint[0] = ~channel_hint[0];
channels = 2;
}
avctx->channels = channels;
avctx->channel_layout = (channels == 2) ? AV_CH_LAYOUT_STEREO :
AV_CH_LAYOUT_MONO;
pcm_data[0] = get_sbits(&gb, 16);
if (channels > 1) {
channel_hint[1] = get_sbits(&gb, 8);
pcm_data[1] = get_sbits(&gb, 16);
}
|
| 9145818e |
frame->nb_samples = samples; |
| 1ec94b0f |
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| b1835732 |
return ret;
for (chan = 0; chan < channels; chan++) { |
| 9145818e |
uint16_t *dest = (uint16_t*)frame->data[0] + chan; |
| b1835732 |
int step_index = channel_hint[chan];
int output = pcm_data[chan];
int sample;
for (sample = 0; sample < samples; sample++) {
int lookup_size, lookup, highbit, lowbits;
step_index = av_clip(step_index, 0, 88);
lookup_size = size_table[step_index];
lookup = get_bits(&gb, lookup_size);
highbit = 1 << (lookup_size - 1);
lowbits = highbit - 1;
if (lookup & highbit)
lookup ^= highbit;
else
highbit = 0;
if (lookup == lowbits) {
output = get_sbits(&gb, 16);
} else {
int predict_index, diff;
predict_index = (lookup << (7 - lookup_size)) | (step_index << 6);
predict_index = av_clip(predict_index, 0, 5785); |
| da227603 |
diff = predict_table[predict_index]; |
| b1835732 |
if (lookup)
diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1);
if (highbit)
diff = -diff;
output = av_clip_int16(output + diff);
}
*dest = output;
dest += channels;
step_index += step_index_tables[lookup_size - 2][lookup];
}
}
*got_frame_ptr = 1;
return pkt->size;
}
AVCodec ff_vima_decoder = {
.name = "vima",
.type = AVMEDIA_TYPE_AUDIO, |
| 7a72695c |
.id = AV_CODEC_ID_VIMA, |
| b1835732 |
.init = decode_init,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),
}; |