mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>pull/64/head
Paul B Mahol
13 years ago
committed by
Vittorio Giovara
parent
a420ccd4f2
commit
6f273093e5
8 changed files with 232 additions and 1 deletions
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "adpcm_data.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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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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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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-1, 4, -1, 4 |
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}; |
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static const int8_t index_table2[] = { |
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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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-1, -1, -1, -1, 1, 2, 4, 6, -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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-1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 2, 2, 4, 5, 6, |
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-1, -1, -1, -1, -1, -1, -1, -1, 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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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 5, 5, 6, 6, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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1, 1, 1, 1, 1, 2, 2, 2, 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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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, |
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2, 2, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, |
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2, 2, 4, 4, 4, 4, 4, 4, 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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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; |
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int 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_adpcm_vima_decoder = { |
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.name = "adpcm_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_ADPCM_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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