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output.c
资源名称：tcpmp.rar [点击查看]
上传用户：wstnjxml
上传日期：2014-04-03
资源大小：7248k
文件大小：18k
源码类别：
Windows CE
开发平台：
C/C++
- /* ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding ** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com ** ** This program 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. ** ** This program 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 this program; if not, write to the Free Software ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ** ** Any non-GPL usage of this software or parts of this software is strictly ** forbidden. ** ** Commercial non-GPL licensing of this software is possible. ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. ** ** $Id: output.c,v 1.42 2004/09/04 14:56:28 menno Exp $ **/ #include "common.h" #include "structs.h" #include "output.h" #include "decoder.h" #ifndef FIXED_POINT #define FLOAT_SCALE (1.0f/(1<<15)) #define DM_MUL REAL_CONST(0.3203772410170407) // 1/(1+sqrt(2) + 1/sqrt(2)) #define RSQRT2 REAL_CONST(0.7071067811865475244) // 1/sqrt(2) static INLINE real_t get_sample(real_t **input, uint8_t channel, uint16_t sample, uint8_t down_matrix, uint8_t *internal_channel) { if (!down_matrix) return input[internal_channel[channel]][sample]; if (channel == 0) { return DM_MUL * (input[internal_channel[1]][sample] + input[internal_channel[0]][sample] * RSQRT2 + input[internal_channel[3]][sample] * RSQRT2); } else { return DM_MUL * (input[internal_channel[2]][sample] + input[internal_channel[0]][sample] * RSQRT2 + input[internal_channel[4]][sample] * RSQRT2); } } #ifndef HAS_LRINTF #define CLIP(sample, max, min) if (sample >= 0.0f) { sample += 0.5f; if (sample >= max) sample = max; } else { sample += -0.5f; if (sample <= min) sample = min; } #else #define CLIP(sample, max, min) if (sample >= 0.0f) { if (sample >= max) sample = max; } else { if (sample <= min) sample = min; } #endif #define CONV(a,b) ((a<<1)|(b&0x1)) static void to_PCM_16bit(NeAACDecHandle hDecoder, real_t **input, uint8_t channels, uint16_t frame_len, int16_t **sample_buffer) { uint8_t ch, ch1; uint16_t i; switch (CONV(channels,hDecoder->downMatrix)) { case CONV(1,0): case CONV(1,1): for(i = 0; i < frame_len; i++) { real_t inp = input[hDecoder->internal_channel[0]][i]; CLIP(inp, 32767.0f, -32768.0f); (*sample_buffer)[i] = (int16_t)lrintf(inp); } break; case CONV(2,0): if (hDecoder->upMatrix) { ch = hDecoder->internal_channel[0]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch][i]; CLIP(inp0, 32767.0f, -32768.0f); (*sample_buffer)[(i*2)+0] = (int16_t)lrintf(inp0); (*sample_buffer)[(i*2)+1] = (int16_t)lrintf(inp0); } } else { ch = hDecoder->internal_channel[0]; ch1 = hDecoder->internal_channel[1]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch ][i]; real_t inp1 = input[ch1][i]; CLIP(inp0, 32767.0f, -32768.0f); CLIP(inp1, 32767.0f, -32768.0f); (*sample_buffer)[(i*2)+0] = (int16_t)lrintf(inp0); (*sample_buffer)[(i*2)+1] = (int16_t)lrintf(inp1); } } break; default: for (ch = 0; ch < channels; ch++) { for(i = 0; i < frame_len; i++) { real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel); CLIP(inp, 32767.0f, -32768.0f); (*sample_buffer)[(i*channels)+ch] = (int16_t)lrintf(inp); } } break; } } static void to_PCM_24bit(NeAACDecHandle hDecoder, real_t **input, uint8_t channels, uint16_t frame_len, int32_t **sample_buffer) { uint8_t ch, ch1; uint16_t i; switch (CONV(channels,hDecoder->downMatrix)) { case CONV(1,0): case CONV(1,1): for(i = 0; i < frame_len; i++) { real_t inp = input[hDecoder->internal_channel[0]][i]; inp *= 256.0f; CLIP(inp, 8388607.0f, -8388608.0f); (*sample_buffer)[i] = (int32_t)lrintf(inp); } break; case CONV(2,0): if (hDecoder->upMatrix) { ch = hDecoder->internal_channel[0]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch][i]; inp0 *= 256.0f; CLIP(inp0, 8388607.0f, -8388608.0f); (*sample_buffer)[(i*2)+0] = (int32_t)lrintf(inp0); (*sample_buffer)[(i*2)+1] = (int32_t)lrintf(inp0); } } else { ch = hDecoder->internal_channel[0]; ch1 = hDecoder->internal_channel[1]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch ][i]; real_t inp1 = input[ch1][i]; inp0 *= 256.0f; inp1 *= 256.0f; CLIP(inp0, 8388607.0f, -8388608.0f); CLIP(inp1, 8388607.0f, -8388608.0f); (*sample_buffer)[(i*2)+0] = (int32_t)lrintf(inp0); (*sample_buffer)[(i*2)+1] = (int32_t)lrintf(inp1); } } break; default: for (ch = 0; ch < channels; ch++) { for(i = 0; i < frame_len; i++) { real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel); inp *= 256.0f; CLIP(inp, 8388607.0f, -8388608.0f); (*sample_buffer)[(i*channels)+ch] = (int32_t)lrintf(inp); } } break; } } static void to_PCM_32bit(NeAACDecHandle hDecoder, real_t **input, uint8_t channels, uint16_t frame_len, int32_t **sample_buffer) { uint8_t ch, ch1; uint16_t i; switch (CONV(channels,hDecoder->downMatrix)) { case CONV(1,0): case CONV(1,1): for(i = 0; i < frame_len; i++) { real_t inp = input[hDecoder->internal_channel[0]][i]; inp *= 65536.0f; CLIP(inp, 2147483647.0f, -2147483648.0f); (*sample_buffer)[i] = (int32_t)lrintf(inp); } break; case CONV(2,0): if (hDecoder->upMatrix) { ch = hDecoder->internal_channel[0]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch][i]; inp0 *= 65536.0f; CLIP(inp0, 2147483647.0f, -2147483648.0f); (*sample_buffer)[(i*2)+0] = (int32_t)lrintf(inp0); (*sample_buffer)[(i*2)+1] = (int32_t)lrintf(inp0); } } else { ch = hDecoder->internal_channel[0]; ch1 = hDecoder->internal_channel[1]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch ][i]; real_t inp1 = input[ch1][i]; inp0 *= 65536.0f; inp1 *= 65536.0f; CLIP(inp0, 2147483647.0f, -2147483648.0f); CLIP(inp1, 2147483647.0f, -2147483648.0f); (*sample_buffer)[(i*2)+0] = (int32_t)lrintf(inp0); (*sample_buffer)[(i*2)+1] = (int32_t)lrintf(inp1); } } break; default: for (ch = 0; ch < channels; ch++) { for(i = 0; i < frame_len; i++) { real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel); inp *= 65536.0f; CLIP(inp, 2147483647.0f, -2147483648.0f); (*sample_buffer)[(i*channels)+ch] = (int32_t)lrintf(inp); } } break; } } static void to_PCM_float(NeAACDecHandle hDecoder, real_t **input, uint8_t channels, uint16_t frame_len, float32_t **sample_buffer) { uint8_t ch, ch1; uint16_t i; switch (CONV(channels,hDecoder->downMatrix)) { case CONV(1,0): case CONV(1,1): for(i = 0; i < frame_len; i++) { real_t inp = input[hDecoder->internal_channel[0]][i]; (*sample_buffer)[i] = inp*FLOAT_SCALE; } break; case CONV(2,0): if (hDecoder->upMatrix) { ch = hDecoder->internal_channel[0]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch][i]; (*sample_buffer)[(i*2)+0] = inp0*FLOAT_SCALE; (*sample_buffer)[(i*2)+1] = inp0*FLOAT_SCALE; } } else { ch = hDecoder->internal_channel[0]; ch1 = hDecoder->internal_channel[1]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch ][i]; real_t inp1 = input[ch1][i]; (*sample_buffer)[(i*2)+0] = inp0*FLOAT_SCALE; (*sample_buffer)[(i*2)+1] = inp1*FLOAT_SCALE; } } break; default: for (ch = 0; ch < channels; ch++) { for(i = 0; i < frame_len; i++) { real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel); (*sample_buffer)[(i*channels)+ch] = inp*FLOAT_SCALE; } } break; } } static void to_PCM_double(NeAACDecHandle hDecoder, real_t **input, uint8_t channels, uint16_t frame_len, double **sample_buffer) { uint8_t ch, ch1; uint16_t i; switch (CONV(channels,hDecoder->downMatrix)) { case CONV(1,0): case CONV(1,1): for(i = 0; i < frame_len; i++) { real_t inp = input[hDecoder->internal_channel[0]][i]; (*sample_buffer)[i] = (double)inp*FLOAT_SCALE; } break; case CONV(2,0): if (hDecoder->upMatrix) { ch = hDecoder->internal_channel[0]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch][i]; (*sample_buffer)[(i*2)+0] = (double)inp0*FLOAT_SCALE; (*sample_buffer)[(i*2)+1] = (double)inp0*FLOAT_SCALE; } } else { ch = hDecoder->internal_channel[0]; ch1 = hDecoder->internal_channel[1]; for(i = 0; i < frame_len; i++) { real_t inp0 = input[ch ][i]; real_t inp1 = input[ch1][i]; (*sample_buffer)[(i*2)+0] = (double)inp0*FLOAT_SCALE; (*sample_buffer)[(i*2)+1] = (double)inp1*FLOAT_SCALE; } } break; default: for (ch = 0; ch < channels; ch++) { for(i = 0; i < frame_len; i++) { real_t inp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->internal_channel); (*sample_buffer)[(i*channels)+ch] = (double)inp*FLOAT_SCALE; } } break; } } void *output_to_PCM(NeAACDecHandle hDecoder, real_t **input, void *sample_buffer, uint8_t channels, uint16_t frame_len, uint8_t format) { int16_t *short_sample_buffer = (int16_t*)sample_buffer; int32_t *int_sample_buffer = (int32_t*)sample_buffer; float32_t *float_sample_buffer = (float32_t*)sample_buffer; double *double_sample_buffer = (double*)sample_buffer; #ifdef PROFILE int64_t count = faad_get_ts(); #endif /* Copy output to a standard PCM buffer */ switch (format) { case FAAD_FMT_16BIT: to_PCM_16bit(hDecoder, input, channels, frame_len, &short_sample_buffer); break; case FAAD_FMT_24BIT: to_PCM_24bit(hDecoder, input, channels, frame_len, &int_sample_buffer); break; case FAAD_FMT_32BIT: to_PCM_32bit(hDecoder, input, channels, frame_len, &int_sample_buffer); break; case FAAD_FMT_FLOAT: to_PCM_float(hDecoder, input, channels, frame_len, &float_sample_buffer); break; case FAAD_FMT_DOUBLE: to_PCM_double(hDecoder, input, channels, frame_len, &double_sample_buffer); break; } #ifdef PROFILE count = faad_get_ts() - count; hDecoder->output_cycles += count; #endif return sample_buffer; } #else #define DM_MUL FRAC_CONST(0.3203772410170407) // 1/(1+sqrt(2) + 1/sqrt(2)) #define RSQRT2 FRAC_CONST(0.7071067811865475244) // 1/sqrt(2) static INLINE real_t get_sample(real_t **input, uint8_t channel, uint16_t sample, uint8_t down_matrix, uint8_t up_matrix, uint8_t *internal_channel) { if (up_matrix == 1) return input[internal_channel[0]][sample]; if (!down_matrix) return input[internal_channel[channel]][sample]; if (channel == 0) { real_t C = MUL_F(input[internal_channel[0]][sample], RSQRT2); real_t L_S = MUL_F(input[internal_channel[3]][sample], RSQRT2); real_t cum = input[internal_channel[1]][sample] + C + L_S; return MUL_F(cum, DM_MUL); } else { real_t C = MUL_F(input[internal_channel[0]][sample], RSQRT2); real_t R_S = MUL_F(input[internal_channel[4]][sample], RSQRT2); real_t cum = input[internal_channel[2]][sample] + C + R_S; return MUL_F(cum, DM_MUL); } }
- void* downMix( NeAACDecHandle hDecoder, real_t **input, uint16_t frame_len, uint8_t channel)
- {
- real_t *a,*b,*c;
- int n;
- a = hDecoder->time_out[hDecoder->internal_channel[0]]; //C
- b = hDecoder->time_out[hDecoder->internal_channel[channel?4:3]]; //S
- c = hDecoder->time_out[hDecoder->internal_channel[channel?2:1]]; //cum
- for (n=0;n<frame_len;++n)
- {
- real_t cum = c[n] + MUL_F(a[n],RSQRT2) + MUL_F(b[n],RSQRT2);
- c[n] = MUL_F(cum, DM_MUL);
- }
- return c;
- }
- void* output_to_PCM(NeAACDecHandle hDecoder, real_t **input, void *sample_buffer, uint8_t channels, uint16_t frame_len, uint8_t format) { uint8_t ch; uint16_t i; int16_t *short_sample_buffer = (int16_t*)sample_buffer; int32_t *int_sample_buffer = (int32_t*)sample_buffer; /* Copy output to a standard PCM buffer */ for (ch = 0; ch < channels; ch++) { switch (format) { case FAAD_FMT_16BIT: for(i = 0; i < frame_len; i++) { int32_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix, hDecoder->internal_channel); if (tmp >= 0) { tmp += (1 << (REAL_BITS-1)); if (tmp >= REAL_CONST(32767)) { tmp = REAL_CONST(32767); } } else { tmp += -(1 << (REAL_BITS-1)); if (tmp <= REAL_CONST(-32768)) { tmp = REAL_CONST(-32768); } } tmp >>= REAL_BITS; short_sample_buffer[(i*channels)+ch] = (int16_t)tmp; } break; case FAAD_FMT_24BIT: for(i = 0; i < frame_len; i++) { int32_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix, hDecoder->internal_channel); if (tmp >= 0) { tmp += (1 << (REAL_BITS-9)); tmp >>= (REAL_BITS-8); if (tmp >= 8388607) { tmp = 8388607; } } else { tmp += -(1 << (REAL_BITS-9)); tmp >>= (REAL_BITS-8); if (tmp <= -8388608) { tmp = -8388608; } } int_sample_buffer[(i*channels)+ch] = (int32_t)tmp; } break; case FAAD_FMT_32BIT: for(i = 0; i < frame_len; i++) { int32_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix, hDecoder->internal_channel); if (tmp >= 0) { tmp += (1 << (16-REAL_BITS-1)); tmp <<= (16-REAL_BITS); } else { tmp += -(1 << (16-REAL_BITS-1)); tmp <<= (16-REAL_BITS); } int_sample_buffer[(i*channels)+ch] = (int32_t)tmp; } break; case FAAD_FMT_FIXED: for(i = 0; i < frame_len; i++) { real_t tmp = get_sample(input, ch, i, hDecoder->downMatrix, hDecoder->upMatrix, hDecoder->internal_channel); int_sample_buffer[(i*channels)+ch] = (int32_t)tmp; } break; } } return sample_buffer; } #endif
