diff options
Diffstat (limited to 'libmpcodecs/ad_imaadpcm.c')
| -rw-r--r-- | libmpcodecs/ad_imaadpcm.c | 340 |
1 files changed, 0 insertions, 340 deletions
diff --git a/libmpcodecs/ad_imaadpcm.c b/libmpcodecs/ad_imaadpcm.c deleted file mode 100644 index 84f667ecd6..0000000000 --- a/libmpcodecs/ad_imaadpcm.c +++ /dev/null @@ -1,340 +0,0 @@ -/* - * IMA ADPCM decoder - * - * This file is in charge of decoding all of the various IMA ADPCM data - * formats that various entities have created. Details about the data - * formats can be found here: - * http://www.pcisys.net/~melanson/codecs/ - * - * So far, this file handles these formats: - * 'ima4': IMA ADPCM found in QT files - * 0x11: IMA ADPCM found in MS AVI/ASF/WAV files - * 0x61: DK4 ADPCM found in certain AVI files on Sega Saturn CD-ROMs; - * note that this is a 'rogue' format number in that it was - * never officially registered with Microsoft - * 0x1100736d: IMA ADPCM coded like in MS AVI/ASF/WAV found in QT files - * - * Copyright (c) 2002 Mike Melanson - * - * This file is part of MPlayer. - * - * MPlayer is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * MPlayer 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with MPlayer; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <inttypes.h> - -#include <libavutil/intreadwrite.h> - -#include "config.h" -#include "mpbswap.h" -#include "ad_internal.h" - -#define MS_IMA_ADPCM_PREAMBLE_SIZE 4 - -#define QT_IMA_ADPCM_PREAMBLE_SIZE 2 -#define QT_IMA_ADPCM_BLOCK_SIZE 0x22 -#define QT_IMA_ADPCM_SAMPLES_PER_BLOCK 64 - -// pertinent tables for IMA ADPCM -static const int16_t adpcm_step[89] = -{ - 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, - 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, - 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, - 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, - 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, - 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, - 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, - 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, - 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 -}; - -static const int8_t adpcm_index[8] = -{ - -1, -1, -1, -1, 2, 4, 6, 8, -}; - -// useful macros -// clamp a number between 0 and 88 -#define CLAMP_0_TO_88(x) x = av_clip(x, 0, 88); -// clamp a number within a signed 16-bit range -#define CLAMP_S16(x) x = av_clip_int16(x); -// clamp a number above 16 -#define CLAMP_ABOVE_16(x) if (x < 16) x = 16; - -static const ad_info_t info = -{ - "IMA ADPCM audio decoder", - "imaadpcm", - "Nick Kurshev", - "Mike Melanson", - "" -}; - -LIBAD_EXTERN(imaadpcm) - -static int preinit(sh_audio_t *sh_audio) -{ - // not exactly sure what this field is for - sh_audio->audio_out_minsize = 8192; - - // if format is "ima4", assume the audio is coming from a QT file which - // indicates constant block size, whereas an AVI/ASF/WAV file will fill - // in this field with 0x11 - if ((sh_audio->format == 0x11) || (sh_audio->format == 0x61) || - (sh_audio->format == 0x1100736d)) - { - sh_audio->ds->ss_div = (sh_audio->wf->nBlockAlign - - (MS_IMA_ADPCM_PREAMBLE_SIZE * sh_audio->wf->nChannels)) * 2; - sh_audio->ds->ss_mul = sh_audio->wf->nBlockAlign; - } - else - { - sh_audio->ds->ss_div = QT_IMA_ADPCM_SAMPLES_PER_BLOCK; - sh_audio->ds->ss_mul = QT_IMA_ADPCM_BLOCK_SIZE * sh_audio->wf->nChannels; - } - sh_audio->audio_in_minsize=sh_audio->ds->ss_mul; - return 1; -} - -static int init(sh_audio_t *sh_audio) -{ - /* IMA-ADPCM 4:1 audio codec:*/ - sh_audio->channels=sh_audio->wf->nChannels; - sh_audio->samplerate=sh_audio->wf->nSamplesPerSec; - /* decodes 34 byte -> 64 short*/ - sh_audio->i_bps = - (sh_audio->ds->ss_mul * sh_audio->samplerate) / sh_audio->ds->ss_div; - sh_audio->samplesize=2; - - return 1; -} - -static void uninit(sh_audio_t *sh_audio) -{ -} - -static int control(sh_audio_t *sh_audio,int cmd,void* arg, ...) -{ - if(cmd==ADCTRL_SKIP_FRAME){ - demux_read_data(sh_audio->ds, sh_audio->a_in_buffer,sh_audio->ds->ss_mul); - return CONTROL_TRUE; - } - return CONTROL_UNKNOWN; -} - -static void decode_nibbles(unsigned short *output, - int output_size, int channels, - int predictor[2], int index[2]) -{ - int step[2]; - int i; - int sign; - int delta; - int channel_number = 0; - - step[0] = adpcm_step[index[0]]; - step[1] = adpcm_step[index[1]]; - - for (i = 0; i < output_size; i++) - { - delta = output[i]; - sign = delta & 8; - delta = delta & 7; - - index[channel_number] += adpcm_index[delta]; - CLAMP_0_TO_88(index[channel_number]); - - delta = 2 * delta + 1; - if (sign) delta = -delta; - - predictor[channel_number] += (delta * step[channel_number]) >> 3; - - CLAMP_S16(predictor[channel_number]); - output[i] = predictor[channel_number]; - step[channel_number] = adpcm_step[index[channel_number]]; - - // toggle channel - channel_number ^= channels - 1; - - } -} - -static int qt_ima_adpcm_decode_block(unsigned short *output, - unsigned char *input, int channels, int block_size) -{ - int initial_predictor[2] = {0}; - int initial_index[2] = {0}; - int i; - - if (channels != 1) channels = 2; - if (block_size < channels * QT_IMA_ADPCM_BLOCK_SIZE) - return -1; - - for (i = 0; i < channels; i++) { - initial_index[i] = initial_predictor[i] = (int16_t)AV_RB16(&input[i * QT_IMA_ADPCM_BLOCK_SIZE]); - - // mask, sign-extend, and clamp the predictor portion - initial_predictor[i] &= ~0x7F; - CLAMP_S16(initial_predictor[i]); - - // mask and clamp the index portion - initial_index[i] &= 0x7F; - CLAMP_0_TO_88(initial_index[i]); - } - - // break apart all of the nibbles in the block - if (channels == 1) - for (i = 0; i < QT_IMA_ADPCM_SAMPLES_PER_BLOCK / 2; i++) - { - output[i * 2 + 0] = input[2 + i] & 0x0F; - output[i * 2 + 1] = input[2 + i] >> 4; - } - else - for (i = 0; i < QT_IMA_ADPCM_SAMPLES_PER_BLOCK / 2; i++) - { - output[i * 4 + 0] = input[2 + i] & 0x0F; - output[i * 4 + 1] = input[2 + QT_IMA_ADPCM_BLOCK_SIZE + i] & 0x0F; - output[i * 4 + 2] = input[2 + i] >> 4; - output[i * 4 + 3] = input[2 + QT_IMA_ADPCM_BLOCK_SIZE + i] >> 4; - } - - decode_nibbles(output, - QT_IMA_ADPCM_SAMPLES_PER_BLOCK * channels, channels, - initial_predictor, initial_index); - - return QT_IMA_ADPCM_SAMPLES_PER_BLOCK * channels; -} - -static int ms_ima_adpcm_decode_block(unsigned short *output, - unsigned char *input, int channels, int block_size) -{ - int predictor[2]; - int index[2]; - int i; - int channel_counter; - int channel_index; - int channel_index_l; - int channel_index_r; - - if (channels != 1) channels = 2; - if (block_size < MS_IMA_ADPCM_PREAMBLE_SIZE * channels) - return -1; - - for (i = 0; i < channels; i++) { - predictor[i] = (int16_t)AV_RL16(&input[i * 4]); - index[i] = input[i * 4 + 2]; - } - - if (channels == 1) - for (i = 0; - i < (block_size - MS_IMA_ADPCM_PREAMBLE_SIZE * channels); i++) - { - output[i * 2 + 0] = input[MS_IMA_ADPCM_PREAMBLE_SIZE + i] & 0x0F; - output[i * 2 + 1] = input[MS_IMA_ADPCM_PREAMBLE_SIZE + i] >> 4; - } - else - { - // encoded as 8 nibbles (4 bytes) per channel; switch channel every - // 4th byte - channel_counter = 0; - channel_index_l = 0; - channel_index_r = 1; - channel_index = channel_index_l; - for (i = 0; - i < (block_size - MS_IMA_ADPCM_PREAMBLE_SIZE * channels); i++) - { - output[channel_index + 0] = - input[MS_IMA_ADPCM_PREAMBLE_SIZE * 2 + i] & 0x0F; - output[channel_index + 2] = - input[MS_IMA_ADPCM_PREAMBLE_SIZE * 2 + i] >> 4; - channel_index += 4; - channel_counter++; - if (channel_counter == 4) - { - channel_index_l = channel_index; - channel_index = channel_index_r; - } - else if (channel_counter == 8) - { - channel_index_r = channel_index; - channel_index = channel_index_l; - channel_counter = 0; - } - } - } - - decode_nibbles(output, - (block_size - MS_IMA_ADPCM_PREAMBLE_SIZE * channels) * 2, - channels, - predictor, index); - - return (block_size - MS_IMA_ADPCM_PREAMBLE_SIZE * channels) * 2; -} - -static int dk4_ima_adpcm_decode_block(unsigned short *output, - unsigned char *input, int channels, int block_size) -{ - int i; - int output_ptr; - int predictor[2]; - int index[2]; - - if (channels != 1) channels = 2; - if (block_size < MS_IMA_ADPCM_PREAMBLE_SIZE * channels) - return -1; - - for (i = 0; i < channels; i++) { - // the first predictor value goes straight to the output - predictor[i] = output[i] = (int16_t)AV_RL16(&input[i * 4]); - index[i] = input[i * 4 + 2]; - } - - output_ptr = channels; - for (i = MS_IMA_ADPCM_PREAMBLE_SIZE * channels; i < block_size; i++) - { - output[output_ptr++] = input[i] >> 4; - output[output_ptr++] = input[i] & 0x0F; - } - - decode_nibbles(&output[channels], - (block_size - MS_IMA_ADPCM_PREAMBLE_SIZE * channels) * 2 - channels, - channels, - predictor, index); - - return (block_size - MS_IMA_ADPCM_PREAMBLE_SIZE * channels) * 2 - channels; -} - -static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen) -{ - int res = -1; - int (*decode_func)(unsigned short *output, unsigned char *input, int channels, int block_size) = qt_ima_adpcm_decode_block; - if (demux_read_data(sh_audio->ds, sh_audio->a_in_buffer, - sh_audio->ds->ss_mul) != - sh_audio->ds->ss_mul) - return -1; - - if ((sh_audio->format == 0x11) || (sh_audio->format == 0x1100736d)) - decode_func = ms_ima_adpcm_decode_block; - else if (sh_audio->format == 0x61) - decode_func = dk4_ima_adpcm_decode_block; - - res = decode_func((unsigned short*)buf, sh_audio->a_in_buffer, - sh_audio->wf->nChannels, sh_audio->ds->ss_mul); - return res < 0 ? res : 2 * res; -} |