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