mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-01 07:20:58 +00:00
47eb818713
some further prettyprinting by myself. Originally committed as revision 13105 to svn://svn.ffmpeg.org/ffmpeg/trunk
581 lines
15 KiB
C
581 lines
15 KiB
C
/*
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* Real Audio 1.0 (14.4K)
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* Copyright (c) 2003 the ffmpeg project
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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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#include "avcodec.h"
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#include "ra144.h"
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#define DATABLOCK1 20 /* size of 14.4 input block in bytes */
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#define DATACHUNK1 1440 /* size of 14.4 input chunk in bytes */
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#define AUDIOBLOCK 160 /* size of output block in 16-bit words (320 bytes) */
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#define AUDIOBUFFER 12288 /* size of output buffer in 16-bit words (24576 bytes) */
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/* consts */
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#define NBLOCKS 4 /* number of segments within a block */
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#define BLOCKSIZE 40 /* (quarter) block size in 16-bit words (80 bytes) */
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#define HALFBLOCK 20 /* BLOCKSIZE/2 */
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#define BUFFERSIZE 146 /* for do_output */
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/* internal globals */
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typedef struct {
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unsigned int resetflag, val, oldval;
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unsigned int unpacked[28]; /* buffer for unpacked input */
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unsigned int *iptr; /* pointer to current input (from unpacked) */
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unsigned int gval;
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unsigned short *gsp;
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unsigned int gbuf1[8];
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unsigned short gbuf2[120];
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signed short output_buffer[40];
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unsigned int *decptr; /* decoder ptr */
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signed short *decsp;
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/* the swapped buffers */
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unsigned int swapb1a[10];
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unsigned int swapb2a[10];
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unsigned int swapb1b[10];
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unsigned int swapb2b[10];
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unsigned int *swapbuf1;
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unsigned int *swapbuf2;
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unsigned int *swapbuf1alt;
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unsigned int *swapbuf2alt;
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unsigned int buffer[5];
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unsigned short int buffer_2[148];
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unsigned short int buffer_a[40];
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unsigned short int buffer_b[40];
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unsigned short int buffer_c[40];
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unsigned short int buffer_d[40];
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unsigned short int work[50];
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unsigned short *sptr;
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int buffer1[10];
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int buffer2[10];
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signed short wavtable1[2304];
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unsigned short wavtable2[2304];
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} Real144_internal;
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static int ra144_decode_init(AVCodecContext * avctx)
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{
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Real144_internal *glob = avctx->priv_data;
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memset(glob, 0, sizeof(Real144_internal));
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glob->resetflag = 1;
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glob->swapbuf1 = glob->swapb1a;
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glob->swapbuf2 = glob->swapb2a;
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glob->swapbuf1alt = glob->swapb1b;
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glob->swapbuf2alt = glob->swapb2b;
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memcpy(glob->wavtable1, wavtable1, sizeof(wavtable1));
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memcpy(glob->wavtable2, wavtable2, sizeof(wavtable2));
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return 0;
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}
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static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len);
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static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest);
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static int irms(short *data, int factor);
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static void rotate_block(short *source, short *target, int offset);
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/* lookup square roots in table */
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static int t_sqrt(unsigned int x)
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{
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int s = 0;
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while (x > 0xfff) {
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s++;
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x = x >> 2;
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}
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return (sqrt_table[x] << s) << 2;
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}
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/* do 'voice' */
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static void do_voice(int *a1, int *a2)
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{
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int buffer[10];
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int *b1, *b2;
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int x, y;
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int *ptr, *tmp;
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b1 = buffer;
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b2 = a2;
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for (x=0; x < 10; x++) {
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b1[x] = (*a1) << 4;
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if(x > 0) {
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ptr = b2 + x;
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for (y=0; y <= x - 1; y++)
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b1[y] = (((*a1) * (*(--ptr))) >> 12) + b2[y];
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}
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tmp = b1;
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b1 = b2;
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b2 = tmp;
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a1++;
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}
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ptr = a2 + 10;
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while (ptr > a2)
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(*a2++) >>= 4;
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}
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/* do quarter-block output */
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static void do_output_subblock(Real144_internal *glob, unsigned int x)
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{
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int a, b, c, d, e, f, g;
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if (x == 1)
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memset(glob->buffer, 0, 20);
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if ((*glob->iptr) == 0)
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a = 0;
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else
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a = (*glob->iptr) + HALFBLOCK - 1;
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glob->iptr++;
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b = *(glob->iptr++);
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c = *(glob->iptr++);
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d = *(glob->iptr++);
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if (a)
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rotate_block(glob->buffer_2, glob->buffer_a, a);
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memcpy(glob->buffer_b, etable1 + b * BLOCKSIZE, BLOCKSIZE * 2);
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e = ((ftable1[b] >> 4) *glob->gval) >> 8;
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memcpy(glob->buffer_c, etable2 + c * BLOCKSIZE, BLOCKSIZE * 2);
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f=((ftable2[c] >> 4) *glob->gval) >> 8;
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if (a)
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g = irms(glob->buffer_a, glob->gval) >> 12;
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else
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g = 0;
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add_wav(glob, d, a, g, e, f, glob->buffer_a, glob->buffer_b,
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glob->buffer_c, glob->buffer_d);
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memmove(glob->buffer_2, glob->buffer_2 + BLOCKSIZE, (BUFFERSIZE - BLOCKSIZE) * 2);
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memcpy(glob->buffer_2 + BUFFERSIZE - BLOCKSIZE, glob->buffer_d, BLOCKSIZE * 2);
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final(glob,glob->gsp, glob->buffer_d, glob->output_buffer, glob->buffer,
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BLOCKSIZE);
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}
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/* rotate block */
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static void rotate_block(short *source, short *target, int offset)
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{
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short *end;
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short *ptr1;
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short *ptr2;
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short *ptr3;
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ptr2 = source + BUFFERSIZE;
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ptr3 = ptr1 = ptr2 - offset;
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end = target + BLOCKSIZE;
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while (target < end) {
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*(target++) = *(ptr3++);
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if (ptr3 == ptr2)
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ptr3 = ptr1;
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}
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}
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/* inverse root mean square */
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static int irms(short *data, int factor)
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{
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short *p1, *p2;
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unsigned int sum;
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p2 = (p1 = data) + BLOCKSIZE;
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for (sum=0; p2 > p1; p1++)
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sum += (*p1) * (*p1);
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if (sum == 0)
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return 0; /* OOPS - division by zero */
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return (0x20000000 / (t_sqrt(sum) >> 8)) * factor;
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}
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/* multiply/add wavetable */
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static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2,
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int m3, short *s1, short *s2, short *s3, short *dest)
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{
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int a, b, c;
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short *ptr, *ptr2;
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ptr = glob->wavtable1 + n * 9;
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ptr2 = glob->wavtable2 + n * 9;
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if (f != 0)
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a = ((*ptr) * m1) >> ((*ptr2) + 1);
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else
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a = 0;
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ptr++;
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ptr2++;
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b = ((*ptr) * m2) >> ((*ptr2) + 1);
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ptr++;
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ptr2++;
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c = ((*ptr) * m3) >> ((*ptr2) + 1);
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ptr2 = (ptr = dest) + BLOCKSIZE;
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if (f != 0)
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while (ptr < ptr2)
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*(ptr++) = ((*(s1++)) * a + (*(s2++)) * b + (*(s3++)) * c) >> 12;
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else
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while (ptr < ptr2)
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*(ptr++) = ((*(s2++)) * b + (*(s3++)) * c) >> 12;
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}
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static void final(Real144_internal *glob, short *i1, short *i2, void *out,
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int *statbuf, int len)
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{
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int x, sum;
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int buffer[10];
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short *ptr;
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short *ptr2;
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memcpy(glob->work, statbuf,20);
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memcpy(glob->work + 10, i2, len * 2);
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buffer[9] = i1[0];
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buffer[8] = i1[1];
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buffer[7] = i1[2];
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buffer[6] = i1[3];
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buffer[5] = i1[4];
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buffer[4] = i1[5];
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buffer[3] = i1[6];
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buffer[2] = i1[7];
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buffer[1] = i1[8];
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buffer[0] = i1[9];
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ptr2 = (ptr = glob->work) + len;
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while (ptr < ptr2) {
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for(sum=0, x=0; x<=9; x++)
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sum += buffer[x] * (ptr[x]);
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sum = sum >> 12;
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x = ptr[10] - sum;
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if (x<-32768 || x>32767) {
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memset(out, 0, len * 2);
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memset(statbuf, 0, 20);
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return;
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}
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ptr[10] = x;
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ptr++;
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}
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memcpy(out, ptr+10 - len, len * 2);
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memcpy(statbuf, ptr, 20);
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}
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/* Decode 20-byte input */
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static void unpack_input(const unsigned char *input, unsigned int *output)
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{
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unsigned int outbuffer[28];
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unsigned short inbuffer[10];
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unsigned int x;
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unsigned int *ptr;
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/* fix endianness */
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for (x=0; x<20; x+=2)
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inbuffer[x/2] = (input[x] << 8) + input[x+1];
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/* unpack */
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ptr=outbuffer;
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*(ptr++) = 27;
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*(ptr++) = (inbuffer[0] >> 10) & 0x3f;
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*(ptr++) = (inbuffer[0] >> 5) & 0x1f;
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*(ptr++) = inbuffer[0] & 0x1f;
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*(ptr++) = (inbuffer[1] >> 12) & 0xf;
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*(ptr++) = (inbuffer[1] >> 8) & 0xf;
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*(ptr++) = (inbuffer[1] >> 5) & 7;
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*(ptr++) = (inbuffer[1] >> 2) & 7;
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*(ptr++) = ((inbuffer[1] << 1) & 6) | ((inbuffer[2] >> 15) & 1);
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*(ptr++) = (inbuffer[2] >> 12) & 7;
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*(ptr++) = (inbuffer[2] >> 10) & 3;
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*(ptr++) = (inbuffer[2] >> 5) & 0x1f;
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*(ptr++) = ((inbuffer[2] << 2) & 0x7c) | ((inbuffer[3] >> 14) & 3);
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*(ptr++) = (inbuffer[3] >> 6) & 0xff;
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*(ptr++) = ((inbuffer[3] << 1) & 0x7e) | ((inbuffer[4] >> 15) & 1);
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*(ptr++) = (inbuffer[4] >> 8) & 0x7f;
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*(ptr++) = (inbuffer[4] >> 1) & 0x7f;
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*(ptr++) = ((inbuffer[4] << 7) & 0x80) | ((inbuffer[5] >> 9) & 0x7f);
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*(ptr++) = (inbuffer[5] >> 2) & 0x7f;
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*(ptr++) = ((inbuffer[5] << 5) & 0x60) | ((inbuffer[6] >> 11) & 0x1f);
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*(ptr++) = (inbuffer[6] >> 4) & 0x7f;
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*(ptr++) = ((inbuffer[6] << 4) & 0xf0) | ((inbuffer[7] >> 12) & 0xf);
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*(ptr++) = (inbuffer[7] >> 5) & 0x7f;
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*(ptr++) = ((inbuffer[7] << 2) & 0x7c) | ((inbuffer[8] >> 14) & 3);
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*(ptr++) = (inbuffer[8] >> 7) & 0x7f;
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*(ptr++) = ((inbuffer[8] << 1) & 0xfe) | ((inbuffer[9] >> 15) & 1);
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*(ptr++) = (inbuffer[9] >> 8) & 0x7f;
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*(ptr++) = (inbuffer[9] >> 1) & 0x7f;
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*(output++) = outbuffer[11];
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for (x=1; x<11; *(output++) = outbuffer[x++]);
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ptr = outbuffer+12;
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for (x=0; x<16; x+=4) {
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*(output++) = ptr[x];
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*(output++) = ptr[x+2];
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*(output++) = ptr[x+3];
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*(output++) = ptr[x+1];
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}
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}
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static unsigned int rms(int *data, int f)
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{
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int *c;
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int x;
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unsigned int res;
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int b;
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c = data;
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b = 0;
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res = 0x10000;
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for (x=0; x<10; x++) {
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res = (((0x1000000 - (*c) * (*c)) >> 12) * res) >> 12;
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if (res == 0)
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return 0;
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if (res <= 0x3fff) {
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while (res <= 0x3fff) {
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b++;
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res <<= 2;
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}
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} else {
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if (res > 0x10000)
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return 0; /* We're screwed, might as well go out with a bang. :P */
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}
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c++;
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}
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if (res > 0)
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res = t_sqrt(res);
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res >>= (b + 10);
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res = (res * f) >> 10;
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return res;
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}
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static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f)
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{
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short *ptr,*end;
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*(glob->decptr++) = rms(data, f);
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glob->decptr++;
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end = (ptr = glob->decsp) + (n * 10);
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while (ptr < end)
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*(ptr++) = *(inp++);
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}
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static int eq(Real144_internal *glob, short *in, int *target)
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{
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int retval;
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int a;
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int b;
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int c;
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unsigned int u;
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short *sptr;
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int *ptr1, *ptr2, *ptr3;
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int *bp1, *bp2, *temp;
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retval = 0;
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bp1 = glob->buffer1;
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bp2 = glob->buffer2;
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ptr2 = (ptr3 = glob->buffer2) + 9;
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sptr = in;
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while (ptr2 >= ptr3)
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*(ptr3++) = *(sptr++);
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target += 9;
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a = bp2[9];
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*target = a;
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if (a + 0x1000 > 0x1fff)
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return 0; /* We're screwed, might as well go out with a bang. :P */
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c = 8;
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u = a;
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while (c >= 0) {
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if (u == 0x1000)
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u++;
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if (u == 0xfffff000)
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u--;
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b = 0x1000-((u * u) >> 12);
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if (b == 0)
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b++;
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ptr2 = bp1;
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ptr1 = (ptr3 = bp2) + c;
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for (u=0; u<=c; u++)
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*(ptr2++) = ((*(ptr3++) - (((*target) * (*(ptr1--))) >> 12)) * (0x1000000 / b)) >> 12;
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*(--target) = u = bp1[(c--)];
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if ((u + 0x1000) > 0x1fff)
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retval = 1;
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temp = bp2;
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bp2 = bp1;
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bp1 = temp;
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}
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return retval;
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}
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static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f,
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int *inp2, int l)
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{
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unsigned int *ptr1,*ptr2;
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int work[10];
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int a,b;
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int x;
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int result;
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if(l + 1 < NBLOCKS / 2)
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a = NBLOCKS - (l + 1);
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else
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a = l + 1;
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b = NBLOCKS - a;
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if (l == 0) {
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glob->decsp = glob->sptr = glob->gbuf2;
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glob->decptr = glob->gbuf1;
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}
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ptr1 = inp;
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ptr2 = inp2;
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for (x=0; x<10*n; x++)
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*(glob->sptr++) = (a * (*ptr1++) + b * (*ptr2++)) >> 2;
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result = eq(glob, glob->decsp, work);
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if (result == 1) {
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dec1(glob, data, inp, n, f);
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} else {
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*(glob->decptr++) = rms(work, f);
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glob->decptr++;
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}
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glob->decsp += n * 10;
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}
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/* Uncompress one block (20 bytes -> 160*2 bytes) */
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static int ra144_decode_frame(AVCodecContext * avctx,
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void *vdata, int *data_size,
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const uint8_t * buf, int buf_size)
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{
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unsigned int a, b, c;
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signed short *shptr;
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unsigned int *lptr, *temp;
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const short **dptr;
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int16_t *datao;
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int16_t *data = vdata;
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Real144_internal *glob = avctx->priv_data;
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if(buf_size == 0)
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return 0;
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datao = data;
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unpack_input(buf, glob->unpacked);
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glob->iptr = glob->unpacked;
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glob->val = decodetable[0][(*(glob->iptr++)) << 1];
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|
|
|
dptr = decodetable + 1;
|
|
lptr = glob->swapbuf1;
|
|
|
|
while (lptr<glob->swapbuf1 + 10)
|
|
*(lptr++) = (*(dptr++))[(*(glob->iptr++)) << 1];
|
|
|
|
do_voice(glob->swapbuf1, glob->swapbuf2);
|
|
|
|
a = t_sqrt(glob->val*glob->oldval) >> 12;
|
|
|
|
for (c=0; c < NBLOCKS; c++) {
|
|
if (c == (NBLOCKS - 1)) {
|
|
dec1(glob, glob->swapbuf1, glob->swapbuf2, 3, glob->val);
|
|
} else {
|
|
if (c * 2 == (NBLOCKS - 2)) {
|
|
if (glob->oldval < glob->val) {
|
|
dec2(glob, glob->swapbuf1, glob->swapbuf2, 3, a, glob->swapbuf2alt, c);
|
|
} else {
|
|
dec2(glob, glob->swapbuf1alt, glob->swapbuf2alt, 3, a, glob->swapbuf2, c);
|
|
}
|
|
} else {
|
|
if (c * 2 < (NBLOCKS - 2)) {
|
|
dec2(glob, glob->swapbuf1alt, glob->swapbuf2alt, 3, glob->oldval, glob->swapbuf2, c);
|
|
} else {
|
|
dec2(glob, glob->swapbuf1, glob->swapbuf2, 3, glob->val, glob->swapbuf2alt, c);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* do output */
|
|
for (b=0, c=0; c<4; c++) {
|
|
glob->gval = glob->gbuf1[c * 2];
|
|
glob->gsp = glob->gbuf2 + b;
|
|
do_output_subblock(glob, glob->resetflag);
|
|
glob->resetflag = 0;
|
|
|
|
shptr = glob->output_buffer;
|
|
while (shptr < glob->output_buffer + BLOCKSIZE)
|
|
*data++ = av_clip_int16(*(shptr++) << 2);
|
|
b += 30;
|
|
}
|
|
|
|
glob->oldval = glob->val;
|
|
temp = glob->swapbuf1alt;
|
|
glob->swapbuf1alt = glob->swapbuf1;
|
|
glob->swapbuf1 = temp;
|
|
temp = glob->swapbuf2alt;
|
|
glob->swapbuf2alt = glob->swapbuf2;
|
|
glob->swapbuf2 = temp;
|
|
*data_size = (data-datao)*sizeof(*data);
|
|
return 20;
|
|
}
|
|
|
|
|
|
AVCodec ra_144_decoder =
|
|
{
|
|
"real_144",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_RA_144,
|
|
sizeof(Real144_internal),
|
|
ra144_decode_init,
|
|
NULL,
|
|
NULL,
|
|
ra144_decode_frame,
|
|
.long_name = "RealAudio 1.0 (14.4K)",
|
|
};
|