wave.cpp
上传用户:yisoukefu
上传日期:2020-08-09
资源大小:39506k
文件大小:5k
- #include "wave.h"
- /* Tables necessary dor decompression */
- static unsigned long wave_table_1503f120[] = {
- 0xFFFFFFFF, 0x00000000, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000006,
- 0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007,
- 0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007,
- 0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000006, 0xFFFFFFFF, 0x00000008
- };
- static unsigned long wave_table_1503f1a0[] = {
- 0x00000007, 0x00000008, 0x00000009, 0x0000000A, 0x0000000B, 0x0000000C, 0x0000000D, 0x0000000E,
- 0x00000010, 0x00000011, 0x00000013, 0x00000015, 0x00000017, 0x00000019, 0x0000001C, 0x0000001F,
- 0x00000022, 0x00000025, 0x00000029, 0x0000002D, 0x00000032, 0x00000037, 0x0000003C, 0x00000042,
- 0x00000049, 0x00000050, 0x00000058, 0x00000061, 0x0000006B, 0x00000076, 0x00000082, 0x0000008F,
- 0x0000009D, 0x000000AD, 0x000000BE, 0x000000D1, 0x000000E6, 0x000000FD, 0x00000117, 0x00000133,
- 0x00000151, 0x00000173, 0x00000198, 0x000001C1, 0x000001EE, 0x00000220, 0x00000256, 0x00000292,
- 0x000002D4, 0x0000031C, 0x0000036C, 0x000003C3, 0x00000424, 0x0000048E, 0x00000502, 0x00000583,
- 0x00000610, 0x000006AB, 0x00000756, 0x00000812, 0x000008E0, 0x000009C3, 0x00000ABD, 0x00000BD0,
- 0x00000CFF, 0x00000E4C, 0x00000FBA, 0x0000114C, 0x00001307, 0x000014EE, 0x00001706, 0x00001954,
- 0x00001BDC, 0x00001EA5, 0x000021B6, 0x00002515, 0x000028CA, 0x00002CDF, 0x0000315B, 0x0000364B,
- 0x00003BB9, 0x000041B2, 0x00004844, 0x00004F7E, 0x00005771, 0x0000602F, 0x000069CE, 0x00007462,
- 0x00007FFF
- };
- /*
- * Decompress a wave file, mono or stereo
- *
- * Offset: 1500F230
- */
- int libmpq_wave_decompress(unsigned char *out_buf, int out_length, unsigned char *in_buf, int in_length, int channels) {
- byte_and_short out;
- byte_and_short in;
- unsigned char *in_end = in_buf + in_length; /* End on input buffer */
- unsigned long index;
- long nr_array1[2];
- long nr_array2[2];
- int count = 0;
- out.pb = out_buf;
- in.pb = in_buf;
- nr_array1[0] = 0x2C;
- nr_array1[1] = 0x2C;
- in.pw++;
- /* 15007AD7 */
- for (count = 0; count < channels; count++) {
- long temp;
- temp = *(short *)in.pw++;
- nr_array2[count] = temp;
- if (out_length < 2) {
- return int(out.pb - out_buf);
- }
- *out.pw++ = (unsigned short)temp;
- out_length -= 2;
- }
- index = channels - 1;
- while (in.pb < in_end) {
- unsigned char one_byte = *in.pb++;
- if (channels == 2) {
- index = (index == 0) ? 1 : 0;
- }
- /*
- * Get one byte from input buffer
- * 15007B25
- */
- if (one_byte & 0x80) {
- /* 15007B32 */
- switch(one_byte & 0x7F) {
- case 0: /* 15007B8E */
- if (nr_array1[index] != 0) {
- nr_array1[index]--;
- }
- if (out_length < 2) {
- break;
- }
- *out.pw++ = (unsigned short)nr_array2[index];
- out_length -= 2;
- continue;
- case 1: /* 15007B72 */
- nr_array1[index] += 8; /* EBX also */
- if (nr_array1[index] > 0x58) {
- nr_array1[index] = 0x58;
- }
- if (channels == 2) {
- index = (index == 0) ? 1 : 0;
- }
- continue;
- case 2:
- continue;
- default:
- nr_array1[index] -= 8;
- if (nr_array1[index] < 0) {
- nr_array1[index] = 0;
- }
- if (channels != 2) {
- continue;
- }
- index = (index == 0) ? 1 : 0;
- continue;
- }
- } else {
- unsigned long temp1 = wave_table_1503f1a0[nr_array1[index]]; /* EDI */
- unsigned long temp2 = temp1 >> in_buf[1]; /* ESI */
- long temp3 = nr_array2[index]; /* ECX */
- if (one_byte & 0x01) { /* EBX = one_byte */
- temp2 += (temp1 >> 0);
- }
- if (one_byte & 0x02) {
- temp2 += (temp1 >> 1);
- }
- if (one_byte & 0x04) {
- temp2 += (temp1 >> 2);
- }
- if (one_byte & 0x08) {
- temp2 += (temp1 >> 3);
- }
- if (one_byte & 0x10) {
- temp2 += (temp1 >> 4);
- }
- if (one_byte & 0x20) {
- temp2 += (temp1 >> 5);
- }
- if(one_byte & 0x40) {
- temp3 -= temp2;
- if (temp3 <= (long)0xFFFF8000) {
- temp3 = (long)0xFFFF8000;
- }
- } else {
- temp3 += temp2;
- if (temp3 >= 0x7FFF) {
- temp3 = 0x7FFF;
- }
- }
- nr_array2[index] = temp3;
- if (out_length < 2) {
- break;
- }
- temp2 = nr_array1[index];
- one_byte &= 0x1F;
- *out.pw++ = (unsigned short)temp3;
- out_length -= 2;
- temp2 += wave_table_1503f120[one_byte];
- nr_array1[index] = temp2;
- if (nr_array1[index] < 0) {
- nr_array1[index] = 0;
- } else {
- if (nr_array1[index] > 0x58) {
- nr_array1[index] = 0x58;
- }
- }
- }
- }
- return int(out.pb - out_buf);
- }