mirror of
https://github.com/mpv-player/mpv
synced 2024-12-30 19:22:11 +00:00
fc6a9e4a3e
Remove the private bswap and intreadwrite.h implementations and use libavutil headers instead. Originally these headers weren't publicly installed by libavutil at all. That already changed in 2010, but the pure C bswap version in installed headers was very inefficient. That was recently (2011-12) improved and now using the public bswap version probably shouldn't cause noticeable performance problems, at least if using a new enough compiler.
263 lines
6.6 KiB
C
263 lines
6.6 KiB
C
/*
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* DK3 ADPCM decoder
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*
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* "This format number was used by Duck Corp. but not officially
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* registered with Microsoft"
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*
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* This file is responsible for decoding audio data encoded with
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* Duck Corp's DK3 ADPCM algorithm. Details about the data format
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* can be found here:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* Copyright (c) 2002 Mike Melanson
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libavutil/intreadwrite.h>
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#include "config.h"
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#include "ad_internal.h"
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static const ad_info_t info =
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{
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"Duck Corp. DK3 ADPCM decoder",
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"dk3adpcm",
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"Nick Kurshev",
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"Mike Melanson",
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""
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};
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LIBAD_EXTERN(dk3adpcm)
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#define DK3_ADPCM_PREAMBLE_SIZE 16
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// useful macros
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// clamp a number between 0 and 88
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#define CLAMP_0_TO_88(x) if (x < 0) x = 0; else if (x > 88) x = 88;
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// clamp a number within a signed 16-bit range
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#define CLAMP_S16(x) if (x < -32768) x = -32768; \
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else if (x > 32767) x = 32767;
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// clamp a number above 16
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#define CLAMP_ABOVE_16(x) if (x < 16) x = 16;
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// sign extend a 16-bit value
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#define SE_16BIT(x) if (x & 0x8000) x -= 0x10000;
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// sign extend a 4-bit value
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#define SE_4BIT(x) if (x & 0x8) x -= 0x10;
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// pertinent tables
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static int adpcm_step[89] =
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{
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7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
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19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
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50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
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130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
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337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
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876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
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2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
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5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
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15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
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};
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static int adpcm_index[16] =
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{
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8
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};
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static int preinit(sh_audio_t *sh_audio)
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{
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sh_audio->audio_out_minsize = sh_audio->wf->nBlockAlign * 6;
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sh_audio->ds->ss_div =
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(sh_audio->wf->nBlockAlign - DK3_ADPCM_PREAMBLE_SIZE) * 8 / 3;
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sh_audio->audio_in_minsize=
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sh_audio->ds->ss_mul = sh_audio->wf->nBlockAlign;
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return 1;
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}
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static int init(sh_audio_t *sh_audio)
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{
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sh_audio->channels = sh_audio->wf->nChannels;
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sh_audio->samplerate = sh_audio->wf->nSamplesPerSec;
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sh_audio->i_bps =
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(sh_audio->ds->ss_mul * sh_audio->samplerate) / sh_audio->ds->ss_div;
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sh_audio->samplesize=2;
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return 1;
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}
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static void uninit(sh_audio_t *sh_audio)
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{
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}
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static int control(sh_audio_t *sh_audio,int cmd,void* arg, ...)
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{
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if(cmd==ADCTRL_SKIP_FRAME){
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demux_read_data(sh_audio->ds, sh_audio->a_in_buffer,sh_audio->ds->ss_mul);
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return CONTROL_TRUE;
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}
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return CONTROL_UNKNOWN;
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}
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#define DK3_GET_NEXT_NIBBLE() \
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if (decode_top_nibble_next) \
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{ \
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nibble = (last_byte >> 4) & 0x0F; \
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decode_top_nibble_next = 0; \
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} \
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else \
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{ \
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last_byte = input[in_ptr++]; \
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nibble = last_byte & 0x0F; \
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decode_top_nibble_next = 1; \
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}
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// note: This decoder assumes the format 0x62 data always comes in
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// stereo flavor
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static int dk3_adpcm_decode_block(unsigned short *output, unsigned char *input,
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int block_size)
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{
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int sum_pred;
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int diff_pred;
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int sum_index;
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int diff_index;
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int diff_channel;
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int in_ptr = 0x10;
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int out_ptr = 0;
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unsigned char last_byte = 0;
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unsigned char nibble;
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int decode_top_nibble_next = 0;
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// ADPCM work variables
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int sign;
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int delta;
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int step;
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int diff;
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sum_pred = AV_RL16(&input[10]);
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diff_pred = AV_RL16(&input[12]);
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SE_16BIT(sum_pred);
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SE_16BIT(diff_pred);
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diff_channel = diff_pred;
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sum_index = input[14];
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diff_index = input[15];
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while (in_ptr < block_size - !decode_top_nibble_next)
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// while (in_ptr < 2048)
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{
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// process the first predictor of the sum channel
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DK3_GET_NEXT_NIBBLE();
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step = adpcm_step[sum_index];
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sign = nibble & 8;
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delta = nibble & 7;
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diff = step >> 3;
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if (delta & 4) diff += step;
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if (delta & 2) diff += step >> 1;
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if (delta & 1) diff += step >> 2;
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if (sign)
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sum_pred -= diff;
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else
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sum_pred += diff;
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CLAMP_S16(sum_pred);
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sum_index += adpcm_index[nibble];
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CLAMP_0_TO_88(sum_index);
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// process the diff channel predictor
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DK3_GET_NEXT_NIBBLE();
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step = adpcm_step[diff_index];
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sign = nibble & 8;
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delta = nibble & 7;
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diff = step >> 3;
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if (delta & 4) diff += step;
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if (delta & 2) diff += step >> 1;
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if (delta & 1) diff += step >> 2;
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if (sign)
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diff_pred -= diff;
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else
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diff_pred += diff;
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CLAMP_S16(diff_pred);
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diff_index += adpcm_index[nibble];
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CLAMP_0_TO_88(diff_index);
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// output the first pair of stereo PCM samples
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diff_channel = (diff_channel + diff_pred) / 2;
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output[out_ptr++] = sum_pred + diff_channel;
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output[out_ptr++] = sum_pred - diff_channel;
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// process the second predictor of the sum channel
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DK3_GET_NEXT_NIBBLE();
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step = adpcm_step[sum_index];
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sign = nibble & 8;
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delta = nibble & 7;
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diff = step >> 3;
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if (delta & 4) diff += step;
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if (delta & 2) diff += step >> 1;
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if (delta & 1) diff += step >> 2;
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if (sign)
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sum_pred -= diff;
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else
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sum_pred += diff;
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CLAMP_S16(sum_pred);
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sum_index += adpcm_index[nibble];
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CLAMP_0_TO_88(sum_index);
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// output the second pair of stereo PCM samples
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output[out_ptr++] = sum_pred + diff_channel;
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output[out_ptr++] = sum_pred - diff_channel;
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}
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return out_ptr;
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}
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static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
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{
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if (demux_read_data(sh_audio->ds, sh_audio->a_in_buffer,
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sh_audio->ds->ss_mul) !=
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sh_audio->ds->ss_mul)
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return -1; /* EOF */
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if (maxlen < 2 * 4 * sh_audio->wf->nBlockAlign * 2 / 3) {
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mp_msg(MSGT_DECAUDIO, MSGL_V, "dk3adpcm: maxlen too small in decode_audio\n");
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return -1;
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}
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return 2 * dk3_adpcm_decode_block(
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(unsigned short*)buf, sh_audio->a_in_buffer,
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sh_audio->ds->ss_mul);
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}
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