iOS-音频-格式转换（pcm转成mp3）

/* * Interface to MP3 LAME encoding engine * * Copyright (c) 1999 Mark Taylor * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* $Id: lame.h,v 1.189.2.1 2012/01/08 23:49:58 robert Exp $ */ #ifndef LAME_LAME_H #define LAME_LAME_H /* for size_t typedef */ #include <stddef.h> /* for va_list typedef */ #include <stdarg.h> /* for FILE typedef, TODO: remove when removing lame_mp3_tags_fid */ #include <stdio.h> #if defined(__cplusplus) extern "C" { #endif typedef void (*lame_report_function)(const char *format, va_list ap); #if defined(WIN32) || defined(_WIN32) #undef CDECL #define CDECL __cdecl #else #define CDECL #endif #define DEPRECATED_OR_OBSOLETE_CODE_REMOVED 1 typedef enum vbr_mode_e { vbr_off=0, vbr_mt, /* obsolete, same as vbr_mtrh */ vbr_rh, vbr_abr, vbr_mtrh, vbr_max_indicator, /* Don't use this! It's used for sanity checks. */ vbr_default=vbr_mtrh /* change this to change the default VBR mode of LAME */ } vbr_mode; /* MPEG modes */ typedef enum MPEG_mode_e { STEREO = 0, JOINT_STEREO, DUAL_CHANNEL, /* LAME doesn't supports this! */ MONO, NOT_SET, MAX_INDICATOR /* Don't use this! It's used for sanity checks. */ } MPEG_mode; /* Padding types */ typedef enum Padding_type_e { PAD_NO = 0, PAD_ALL, PAD_ADJUST, PAD_MAX_INDICATOR /* Don't use this! It's used for sanity checks. */ } Padding_type; /*presets*/ typedef enum preset_mode_e { /*values from 8 to 320 should be reserved for abr bitrates*/ /*for abr I'd suggest to directly use the targeted bitrate as a value*/ ABR_8 = 8, ABR_320 = 320, V9 = 410, /*Vx to match Lame and VBR_xx to match FhG*/ VBR_10 = 410, V8 = 420, VBR_20 = 420, V7 = 430, VBR_30 = 430, V6 = 440, VBR_40 = 440, V5 = 450, VBR_50 = 450, V4 = 460, VBR_60 = 460, V3 = 470, VBR_70 = 470, V2 = 480, VBR_80 = 480, V1 = 490, VBR_90 = 490, V0 = 500, VBR_100 = 500, /*still there for compatibility*/ R3MIX = 1000, STANDARD = 1001, EXTREME = 1002, INSANE = 1003, STANDARD_FAST = 1004, EXTREME_FAST = 1005, MEDIUM = 1006, MEDIUM_FAST = 1007 } preset_mode; /*asm optimizations*/ typedef enum asm_optimizations_e { MMX = 1, AMD_3DNOW = 2, SSE = 3 } asm_optimizations; /* psychoacoustic model */ typedef enum Psy_model_e { PSY_GPSYCHO = 1, PSY_NSPSYTUNE = 2 } Psy_model; /* buffer considerations */ typedef enum buffer_constraint_e { MDB_DEFAULT=0, MDB_STRICT_ISO=1, MDB_MAXIMUM=2 } buffer_constraint; struct lame_global_struct; typedef struct lame_global_struct lame_global_flags; typedef lame_global_flags *lame_t; /*********************************************************************** * * The LAME API * These functions should be called, in this order, for each * MP3 file to be encoded. See the file "API" for more documentation * ***********************************************************************/ /* * REQUIRED: * initialize the encoder. sets default for all encoder parameters, * returns NULL if some malloc()'s failed * otherwise returns pointer to structure needed for all future * API calls. */ lame_global_flags * CDECL lame_init(void); #if DEPRECATED_OR_OBSOLETE_CODE_REMOVED #else /* obsolete version */ int CDECL lame_init_old(lame_global_flags *); #endif /* * OPTIONAL: * set as needed to override defaults */ /******************************************************************** * input stream description ***********************************************************************/ /* number of samples. default = 2^32-1 */ int CDECL lame_set_num_samples(lame_global_flags *, unsigned long); unsigned long CDECL lame_get_num_samples(const lame_global_flags *); /* input sample rate in Hz. default = 44100hz */ int CDECL lame_set_in_samplerate(lame_global_flags *, int); int CDECL lame_get_in_samplerate(const lame_global_flags *); /* number of channels in input stream. default=2 */ int CDECL lame_set_num_channels(lame_global_flags *, int); int CDECL lame_get_num_channels(const lame_global_flags *); /* scale the input by this amount before encoding. default=1 (not used by decoding routines) */ int CDECL lame_set_scale(lame_global_flags *, float); float CDECL lame_get_scale(const lame_global_flags *); /* scale the channel 0 (left) input by this amount before encoding. default=1 (not used by decoding routines) */ int CDECL lame_set_scale_left(lame_global_flags *, float); float CDECL lame_get_scale_left(const lame_global_flags *); /* scale the channel 1 (right) input by this amount before encoding. default=1 (not used by decoding routines) */ int CDECL lame_set_scale_right(lame_global_flags *, float); float CDECL lame_get_scale_right(const lame_global_flags *); /* output sample rate in Hz. default = 0, which means LAME picks best value based on the amount of compression. MPEG only allows: MPEG1 32, 44.1, 48khz MPEG2 16, 22.05, 24 MPEG2.5 8, 11.025, 12 (not used by decoding routines) */ int CDECL lame_set_out_samplerate(lame_global_flags *, int); int CDECL lame_get_out_samplerate(const lame_global_flags *); /******************************************************************** * general control parameters ***********************************************************************/ /* 1=cause LAME to collect data for an MP3 frame analyzer. default=0 */ int CDECL lame_set_analysis(lame_global_flags *, int); int CDECL lame_get_analysis(const lame_global_flags *); /* 1 = write a Xing VBR header frame. default = 1 this variable must have been added by a Hungarian notation Windows programmer :-) */ int CDECL lame_set_bWriteVbrTag(lame_global_flags *, int); int CDECL lame_get_bWriteVbrTag(const lame_global_flags *); /* 1=decode only. use lame/mpglib to convert mp3/ogg to wav. default=0 */ int CDECL lame_set_decode_only(lame_global_flags *, int); int CDECL lame_get_decode_only(const lame_global_flags *); #if DEPRECATED_OR_OBSOLETE_CODE_REMOVED #else /* 1=encode a Vorbis .ogg file. default=0 */ /* DEPRECATED */ int CDECL lame_set_ogg(lame_global_flags *, int); int CDECL lame_get_ogg(const lame_global_flags *); #endif /* internal algorithm selection. True quality is determined by the bitrate but this variable will effect quality by selecting expensive or cheap algorithms. quality=0..9. 0=best (very slow). 9=worst. recommended: 2 near-best quality, not too slow 5 good quality, fast 7 ok quality, really fast */ int CDECL lame_set_quality(lame_global_flags *, int); int CDECL lame_get_quality(const lame_global_flags *); /* mode = 0,1,2,3 = stereo, jstereo, dual channel (not supported), mono default: lame picks based on compression ration and input channels */ int CDECL lame_set_mode(lame_global_flags *, MPEG_mode); MPEG_mode CDECL lame_get_mode(const lame_global_flags *); #if DEPRECATED_OR_OBSOLETE_CODE_REMOVED #else /* mode_automs. Use a M/S mode with a switching threshold based on compression ratio DEPRECATED */ int CDECL lame_set_mode_automs(lame_global_flags *, int); int CDECL lame_get_mode_automs(const lame_global_flags *); #endif /* force_ms. Force M/S for all frames. For tes