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Diffstat (limited to 'ffmpeg/libavcodec/vima.c')
| -rw-r--r-- | ffmpeg/libavcodec/vima.c | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/ffmpeg/libavcodec/vima.c b/ffmpeg/libavcodec/vima.c deleted file mode 100644 index f040e1b..0000000 --- a/ffmpeg/libavcodec/vima.c +++ /dev/null @@ -1,239 +0,0 @@ -/* - * LucasArts VIMA decoder - * 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 - */ - -/** - * @file - * LucasArts VIMA audio decoder - * @author Paul B Mahol - */ - -#include "libavutil/channel_layout.h" -#include "avcodec.h" -#include "get_bits.h" -#include "internal.h" -#include "adpcm_data.h" - -static int predict_table_init = 0; -static uint16_t predict_table[5786 * 2]; - -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) -{ - int start_pos; - - avctx->sample_fmt = AV_SAMPLE_FMT_S16; - - if (predict_table_init) - return 0; - - 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; - } - predict_table[dest_pos] = put; - } - } - predict_table_init = 1; - - return 0; -} - -static int decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *pkt) -{ - GetBitContext gb; - AVFrame *frame = data; - 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; - - if ((ret = init_get_bits8(&gb, pkt->data, pkt->size)) < 0) - return ret; - - 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); - } - - frame->nb_samples = samples; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - - for (chan = 0; chan < channels; chan++) { - uint16_t *dest = (uint16_t*)frame->data[0] + chan; - 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); - diff = predict_table[predict_index]; - 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", - .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_VIMA, - .init = decode_init, - .decode = decode_frame, - .capabilities = CODEC_CAP_DR1, -}; |