ref: ac259297b5a4a60cb82b1e87d0f481d7926e66e2
dir: /src/sox.h/
/* libSoX Library Public Interface
*
* Copyright 1999-2011 Chris Bagwell and SoX Contributors.
*
* This source code is freely redistributable and may be used for
* any purpose. This copyright notice must be maintained.
* Chris Bagwell And SoX Contributors are not responsible for
* the consequences of using this software.
*/
#ifndef SOX_H
#define SOX_H
#include <limits.h>
#include <stdarg.h>
#include <stddef.h> /* Ensure NULL etc. are available throughout SoX */
#include <stdio.h>
#include <stdlib.h>
/* TODO: soxstdint.h can conflict with standard C headers -- needs work. */
#include "soxstdint.h"
typedef int32_t int24_t; /* int24_t == int32_t (beware of the extra byte) */
typedef uint32_t uint24_t; /* uint24_t == uint32_t (beware of the extra byte) */
#if defined(__cplusplus)
extern "C" {
#endif
/* Avoid warnings about unused parameters. */
#ifdef __GNUC__
#define LSX_UNUSED __attribute__ ((unused))
#define LSX_PRINTF __attribute__ ((format (printf, 1, 2)))
#else
#define LSX_UNUSED
#define LSX_PRINTF
#endif
#ifdef _MSC_VER
#define LSX_UNUSED_VAR(x) ((void)(x))
#else
#define LSX_UNUSED_VAR(x) ((void)0)
#endif
/* The following is the API version of libSoX. It is not meant
* to follow the version number of SoX but it has historically.
* Please do not count on these numbers being in sync. */
#define SOX_LIB_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#define SOX_LIB_VERSION_CODE SOX_LIB_VERSION(14, 4, 0)
/* Returns version number */
const char *sox_version(void);
/* Flags indicating whether optional features are present in this build of SoX */
typedef enum sox_version_flags_t {
sox_version_none = 0,
sox_version_have_popen = 1,
sox_version_have_magic = 2,
sox_version_have_threads = 4,
sox_version_have_memopen = 8
} sox_version_flags_t;
/* Information about this build of SoX */
typedef struct sox_version_info_t {
size_t size; /* structure size = sizeof(sox_version_info_t) */
sox_version_flags_t flags; /* feature flags = popen | magic | threads | memopen */
uint32_t version_code; /* version number = SOX_LIB_VERSION_CODE, i.e. 0x140400 */
const char * version; /* version string = sox_version(), i.e. "14.4.0" */
const char * version_extra;/* version extra info or null = "PACKAGE_EXTRA", i.e. "beta" */
const char * time; /* build time = "__DATE__ __TIME__", i.e. "Jan 7 2010 03:31:50" */
const char * distro; /* distro or null = "DISTRO", i.e. "Debian" */
const char * compiler; /* compiler info or null, i.e. "msvc 160040219" */
const char * arch; /* arch, i.e. "1248 48 44 L OMP" */
/* new info should be added at the end for version backwards-compatibility. */
} sox_version_info_t;
/* gets information about this build of libsox */
sox_version_info_t const * sox_version_info(void);
/* libSoX-specific error codes. The rest directly map from errno. */
enum sox_error_t {
SOX_SUCCESS = 0, /* Function succeeded = 0 */
SOX_EOF = -1, /* End Of File or other error = -1 */
SOX_EHDR = 2000, /* Invalid Audio Header */
SOX_EFMT, /* Unsupported data format */
SOX_ENOMEM, /* Can't alloc memory */
SOX_EPERM, /* Operation not permitted */
SOX_ENOTSUP, /* Operation not supported */
SOX_EINVAL /* Invalid argument */
};
/* Boolean type, assignment (but not necessarily binary) compatible with C++ bool */
typedef enum sox_bool {
sox_false,
sox_true
} sox_bool;
#define SOX_INT_MIN(bits) (1 <<((bits)-1)) /* i.e. 0x80, 0x8000, 0x80000000 */
#define SOX_INT_MAX(bits) (((unsigned)-1)>>(33-(bits))) /* i.e. 0x7F, 0x7FFF, 0x7FFFFFFF */
#define SOX_UINT_MAX(bits) (SOX_INT_MIN(bits)|SOX_INT_MAX(bits)) /* i.e. 0xFF, 0xFFFF, 0xFFFFFFFF */
#define SOX_INT8_MAX SOX_INT_MAX(8) /* = 0x7F */
#define SOX_INT16_MAX SOX_INT_MAX(16) /* = 0x7FFF */
#define SOX_INT24_MAX SOX_INT_MAX(24) /* = 0x007FFFFF */
#define SOX_INT32_MAX SOX_INT_MAX(32) /* = 0x7FFFFFFF */
/* native SoX audio sample type */
typedef int32_t sox_sample_t;
/* Minimum and maximum values a sample can hold. */
#define SOX_SAMPLE_PRECISION 32 /* bits in a sox_sample_t = 32 */
#define SOX_SAMPLE_MAX (sox_sample_t)SOX_INT_MAX(32) /* max value for sox_sample_t = 0x7FFFFFFF */
#define SOX_SAMPLE_MIN (sox_sample_t)SOX_INT_MIN(32) /* min value for sox_sample_t = 0x80000000 */
/* Conversions: Linear PCM <--> sox_sample_t
*
* I/O Input sox_sample_t Clips? Input sox_sample_t Clips?
* Format Minimum Minimum I O Maximum Maximum I O
* ------ --------- ------------ -- -- -------- ------------ -- --
* Float -inf -1 y n inf 1 - 5e-10 y n
* Int8 -128 -128 n n 127 127.9999999 n y
* Int16 -32768 -32768 n n 32767 32767.99998 n y
* Int24 -8388608 -8388608 n n 8388607 8388607.996 n y
* Int32 -2147483648 -2147483648 n n 2147483647 2147483647 n n
*
* Conversions are as accurate as possible (with rounding).
*
* Rounding: halves toward +inf, all others to nearest integer.
*
* Clips? shows whether on not there is the possibility of a conversion
* clipping to the minimum or maximum value when inputing from or outputing
* to a given type.
*
* Unsigned integers are converted to and from signed integers by flipping
* the upper-most bit then treating them as signed integers.
*/
#define SOX_SAMPLE_LOCALS sox_sample_t sox_macro_temp_sample LSX_UNUSED; \
double sox_macro_temp_double LSX_UNUSED
#define SOX_SAMPLE_NEG SOX_INT_MIN(32) /* sign bit for sox_sample_t = 0x80000000 */
#define SOX_SAMPLE_TO_UNSIGNED(bits,d,clips) \
(uint##bits##_t)(SOX_SAMPLE_TO_SIGNED(bits,d,clips)^SOX_INT_MIN(bits))
#define SOX_SAMPLE_TO_SIGNED(bits,d,clips) \
(int##bits##_t)(LSX_UNUSED_VAR(sox_macro_temp_double),sox_macro_temp_sample=(d),sox_macro_temp_sample>SOX_SAMPLE_MAX-(1<<(31-bits))?++(clips),SOX_INT_MAX(bits):((uint32_t)(sox_macro_temp_sample+(1<<(31-bits))))>>(32-bits))
#define SOX_SIGNED_TO_SAMPLE(bits,d)((sox_sample_t)(d)<<(32-bits))
#define SOX_UNSIGNED_TO_SAMPLE(bits,d)(SOX_SIGNED_TO_SAMPLE(bits,d)^SOX_SAMPLE_NEG)
#define SOX_UNSIGNED_8BIT_TO_SAMPLE(d,clips) SOX_UNSIGNED_TO_SAMPLE(8,d)
#define SOX_SIGNED_8BIT_TO_SAMPLE(d,clips) SOX_SIGNED_TO_SAMPLE(8,d)
#define SOX_UNSIGNED_16BIT_TO_SAMPLE(d,clips) SOX_UNSIGNED_TO_SAMPLE(16,d)
#define SOX_SIGNED_16BIT_TO_SAMPLE(d,clips) SOX_SIGNED_TO_SAMPLE(16,d)
#define SOX_UNSIGNED_24BIT_TO_SAMPLE(d,clips) SOX_UNSIGNED_TO_SAMPLE(24,d)
#define SOX_SIGNED_24BIT_TO_SAMPLE(d,clips) SOX_SIGNED_TO_SAMPLE(24,d)
#define SOX_UNSIGNED_32BIT_TO_SAMPLE(d,clips) ((sox_sample_t)(d)^SOX_SAMPLE_NEG)
#define SOX_SIGNED_32BIT_TO_SAMPLE(d,clips) (sox_sample_t)(d)
#define SOX_FLOAT_32BIT_TO_SAMPLE(d,clips) (sox_sample_t)(LSX_UNUSED_VAR(sox_macro_temp_sample),sox_macro_temp_double=(d)*(SOX_SAMPLE_MAX+1.),sox_macro_temp_double<SOX_SAMPLE_MIN?++(clips),SOX_SAMPLE_MIN:sox_macro_temp_double>=SOX_SAMPLE_MAX+1.?sox_macro_temp_double>SOX_SAMPLE_MAX+1.?++(clips),SOX_SAMPLE_MAX:SOX_SAMPLE_MAX:sox_macro_temp_double)
#define SOX_FLOAT_64BIT_TO_SAMPLE(d,clips) (sox_sample_t)(LSX_UNUSED_VAR(sox_macro_temp_sample),sox_macro_temp_double=(d)*(SOX_SAMPLE_MAX+1.),sox_macro_temp_double<0?sox_macro_temp_double<=SOX_SAMPLE_MIN-.5?++(clips),SOX_SAMPLE_MIN:sox_macro_temp_double-.5:sox_macro_temp_double>=SOX_SAMPLE_MAX+.5?sox_macro_temp_double>SOX_SAMPLE_MAX+1.?++(clips),SOX_SAMPLE_MAX:SOX_SAMPLE_MAX:sox_macro_temp_double+.5)
#define SOX_SAMPLE_TO_UNSIGNED_8BIT(d,clips) SOX_SAMPLE_TO_UNSIGNED(8,d,clips)
#define SOX_SAMPLE_TO_SIGNED_8BIT(d,clips) SOX_SAMPLE_TO_SIGNED(8,d,clips)
#define SOX_SAMPLE_TO_UNSIGNED_16BIT(d,clips) SOX_SAMPLE_TO_UNSIGNED(16,d,clips)
#define SOX_SAMPLE_TO_SIGNED_16BIT(d,clips) SOX_SAMPLE_TO_SIGNED(16,d,clips)
#define SOX_SAMPLE_TO_UNSIGNED_24BIT(d,clips) SOX_SAMPLE_TO_UNSIGNED(24,d,clips)
#define SOX_SAMPLE_TO_SIGNED_24BIT(d,clips) SOX_SAMPLE_TO_SIGNED(24,d,clips)
#define SOX_SAMPLE_TO_UNSIGNED_32BIT(d,clips) (uint32_t)((d)^SOX_SAMPLE_NEG)
#define SOX_SAMPLE_TO_SIGNED_32BIT(d,clips) (int32_t)(d)
#define SOX_SAMPLE_TO_FLOAT_32BIT(d,clips) (LSX_UNUSED_VAR(sox_macro_temp_double),sox_macro_temp_sample=(d),sox_macro_temp_sample>SOX_SAMPLE_MAX-128?++(clips),1:(((sox_macro_temp_sample+128)&~255)*(1./(SOX_SAMPLE_MAX+1.))))
#define SOX_SAMPLE_TO_FLOAT_64BIT(d,clips) ((d)*(1./(SOX_SAMPLE_MAX+1.)))
/* MACRO to clip a data type that is greater then sox_sample_t to
* sox_sample_t's limits and increment a counter if clipping occurs.
*/
#define SOX_SAMPLE_CLIP_COUNT(samp, clips) \
do { \
if (samp > SOX_SAMPLE_MAX) \
{ samp = SOX_SAMPLE_MAX; clips++; } \
else if (samp < SOX_SAMPLE_MIN) \
{ samp = SOX_SAMPLE_MIN; clips++; } \
} while (0)
/* Rvalue MACRO to round and clip a double to a sox_sample_t,
* and increment a counter if clipping occurs.
*/
#define SOX_ROUND_CLIP_COUNT(d, clips) \
((d) < 0? (d) <= SOX_SAMPLE_MIN - 0.5? ++(clips), SOX_SAMPLE_MIN: (d) - 0.5 \
: (d) >= SOX_SAMPLE_MAX + 0.5? ++(clips), SOX_SAMPLE_MAX: (d) + 0.5)
/* Rvalue MACRO to clip an integer to a given number of bits
* and increment a counter if clipping occurs.
*/
#define SOX_INTEGER_CLIP_COUNT(bits,i,clips) ( \
(i) >(1 << ((bits)-1))- 1? ++(clips),(1 << ((bits)-1))- 1 : \
(i) <-1 << ((bits)-1) ? ++(clips),-1 << ((bits)-1) : (i))
#define SOX_16BIT_CLIP_COUNT(i,clips) SOX_INTEGER_CLIP_COUNT(16,i,clips)
#define SOX_24BIT_CLIP_COUNT(i,clips) SOX_INTEGER_CLIP_COUNT(24,i,clips)
#define SOX_SIZE_MAX ((size_t)(-1)) /* maximum value of size_t */
/* function-pointer type of globals.output_message_handler */
typedef void (*sox_output_message_handler_t)(
unsigned level,
const char *filename,
const char *fmt, va_list ap);
/* Global parameters (for effects & formats) */
typedef struct sox_globals_t {
/* public: */
unsigned verbosity; /* messages are only written if globals.verbosity >= message.level */
sox_output_message_handler_t output_message_handler; /* client-specified message output callback */
sox_bool repeatable; /* true to use pre-determined timestamps and PRNG seed */
/* The following is used at times in libSoX when alloc()ing buffers
* to perform file I/O. It can be useful to pass in similar sized
* data to get max performance. */
size_t bufsiz; /* default size (in bytes) used for blocks of sample data */
size_t input_bufsiz; /* default size (in bytes) used for blocks of input sample data */
int32_t ranqd1; /* Can be used to re-seed libSoX's PRNG */
/* private: */
char const * stdin_in_use_by; /* tracks the name of the handler currently using stdin */
char const * stdout_in_use_by; /* tracks the name of the handler currently using stdout */
char const * subsystem; /* tracks the name of the handler currently writing an output message */
char * tmp_path; /* client-configured path to use for temporary files */
sox_bool use_magic; /* true if client has requested use of 'magic' file-type detection */
sox_bool use_threads; /* true if client has requested parallel effects processing */
} sox_globals_t;
/* the SoX global settings */
extern sox_globals_t sox_globals;
/* samples per second = double */
typedef double sox_rate_t;
#define SOX_UNSPEC 0 /* unknown value for signal parameter = 0 */
#define SOX_IGNORE_LENGTH (size_t)(-1) /* unspecified length for signal.length = -1 */
/* Signal parameters; SOX_UNSPEC (= 0) if unknown */
typedef struct sox_signalinfo_t {
sox_rate_t rate; /* samples per second, 0 if unknown */
unsigned channels; /* number of sound channels, 0 if unknown */
unsigned precision; /* bits per sample, 0 if unknown */
size_t length; /* samples * chans in file, 0 if unknown, -1 if unspecified */
double * mult; /* Effects headroom multiplier; may be null */
} sox_signalinfo_t;
/* Format of sample data */
typedef enum sox_encoding_t {
SOX_ENCODING_UNKNOWN , /* encoding has not yet been determined */
SOX_ENCODING_SIGN2 , /* signed linear 2's comp: Mac */
SOX_ENCODING_UNSIGNED , /* unsigned linear: Sound Blaster */
SOX_ENCODING_FLOAT , /* floating point (binary format) */
SOX_ENCODING_FLOAT_TEXT, /* floating point (text format) */
SOX_ENCODING_FLAC , /* FLAC compression */
SOX_ENCODING_HCOM , /* Mac FSSD files with Huffman compression */
SOX_ENCODING_WAVPACK , /* WavPack with integer samples */
SOX_ENCODING_WAVPACKF , /* WavPack with float samples */
SOX_ENCODING_ULAW , /* u-law signed logs: US telephony, SPARC */
SOX_ENCODING_ALAW , /* A-law signed logs: non-US telephony, Psion */
SOX_ENCODING_G721 , /* G.721 4-bit ADPCM */
SOX_ENCODING_G723 , /* G.723 3 or 5 bit ADPCM */
SOX_ENCODING_CL_ADPCM , /* Creative Labs 8 --> 2,3,4 bit Compressed PCM */
SOX_ENCODING_CL_ADPCM16, /* Creative Labs 16 --> 4 bit Compressed PCM */
SOX_ENCODING_MS_ADPCM , /* Microsoft Compressed PCM */
SOX_ENCODING_IMA_ADPCM , /* IMA Compressed PCM */
SOX_ENCODING_OKI_ADPCM , /* Dialogic/OKI Compressed PCM */
SOX_ENCODING_DPCM , /* Differential PCM: Fasttracker 2 (xi) */
SOX_ENCODING_DWVW , /* Delta Width Variable Word */
SOX_ENCODING_DWVWN , /* Delta Width Variable Word N-bit */
SOX_ENCODING_GSM , /* GSM 6.10 33byte frame lossy compression */
SOX_ENCODING_MP3 , /* MP3 compression */
SOX_ENCODING_VORBIS , /* Vorbis compression */
SOX_ENCODING_AMR_WB , /* AMR-WB compression */
SOX_ENCODING_AMR_NB , /* AMR-NB compression */
SOX_ENCODING_CVSD , /* Continuously Variable Slope Delta modulation */
SOX_ENCODING_LPC10 , /* Linear Predictive Coding */
SOX_ENCODINGS /* End of list marker */
} sox_encoding_t;
/* Flags for sox_encodings_info_t: lossless/lossy1/lossy2 */
typedef enum sox_encodings_flags_t {
sox_encodings_none = 0, /* no flags specified (implies lossless encoding) */
sox_encodings_lossy1 = 1, /* encode, decode: lossy once */
sox_encodings_lossy2 = 2 /* encode, decode, encode, decode: lossy twice */
} sox_encodings_flags_t;
#define SOX_LOSSY1 sox_encodings_lossy1 /* encode, decode: lossy once */
#define SOX_LOSSY2 sox_encodings_lossy2 /* encode, decode, encode, decode: lossy twice */
typedef struct sox_encodings_info_t {
sox_encodings_flags_t flags; /* lossy once (lossy1), lossy twice (lossy2), or lossless (0) */
char const * name; /* encoding name */
char const * desc; /* encoding description */
} sox_encodings_info_t;
/* the list of available encodings */
extern sox_encodings_info_t const sox_encodings_info[];
/* yes, no, or default (auto-detect) */
typedef enum sox_option_t {
SOX_OPTION_NO,
SOX_OPTION_YES,
SOX_OPTION_DEFAULT
} sox_option_t;
/* Encoding parameters */
typedef struct sox_encodinginfo_t {
sox_encoding_t encoding; /* format of sample numbers */
unsigned bits_per_sample;/* 0 if unknown or variable; uncompressed value if lossless; compressed value if lossy */
double compression; /* compression factor (where applicable) */
/* If these 3 variables are set to SOX_OPTION_DEFAULT, then, during
* sox_open_read or sox_open_write, libSoX will set them to either
* NO or YES according to the machine or format default. */
sox_option_t reverse_bytes; /* endiannesses... */
sox_option_t reverse_nibbles;
sox_option_t reverse_bits;
sox_bool opposite_endian;
} sox_encodinginfo_t;
/* fills in an encodinginfo with default values */
void sox_init_encodinginfo(sox_encodinginfo_t * e);
/* Given an encoding (i.e. SIGN2) and the encoded bits_per_sample (i.e. 16),
* returns the number of useful bits per sample in the decoded data (i.e. 16).
* Returns 0 to indicate that the value returned by the format handler should
* be used instead of a pre-determined precision. */
unsigned sox_precision(
sox_encoding_t encoding,
unsigned bits_per_sample);
/* Defaults for common hardware */
#define SOX_DEFAULT_CHANNELS 2 /* = 2 (stereo) */
#define SOX_DEFAULT_RATE 48000 /* = 48000Hz */
#define SOX_DEFAULT_PRECISION 16 /* = 16 bits per sample */
#define SOX_DEFAULT_ENCODING SOX_ENCODING_SIGN2 /* = SIGN2 (linear 2's complement PCM) */
/* Loop parameters */
/* Loop modes, upper 4 bits mask the loop blass, lower 4 bits describe */
/* the loop behaviour, ie. single shot, bidirectional etc. */
enum sox_loop_flags_t {
sox_loop_none = 0, /* single-shot = 0 */
sox_loop_forward = 1, /* forward loop = 1 */
sox_loop_forward_back = 2, /* forward/back loop = 2 */
sox_loop_8 = 32, /* 8 loops (??) = 32 */
sox_loop_sustain_decay = 64 /* AIFF style, one sustain & one decay loop = 64 */
};
#define SOX_LOOP_NONE ((uint8_t)sox_loop_none) /* single-shot = 0 */
#define SOX_LOOP_8 ((uint8_t)sox_loop_8) /* 8 loops (??) = 32 */
#define SOX_LOOP_SUSTAIN_DECAY ((uint8_t)sox_loop_sustain_decay) /* AIFF style, one sustain & one decay loop = 64 */
/* Looping parameters (out-of-band data) */
typedef struct sox_loopinfo_t {
size_t start; /* first sample */
size_t length; /* length */
unsigned count; /* number of repeats, 0=forever */
uint8_t type; /* 0=no, 1=forward, 2=forward/back (see sox_loop_... for valid values) */
} sox_loopinfo_t;
/* Instrument parameters */
/* vague attempt at generic information for sampler-specific info */
/* instrument information */
typedef struct sox_instrinfo_t{
int8_t MIDInote; /* for unity pitch playback */
int8_t MIDIlow; /* MIDI pitch-bend low range */
int8_t MIDIhi; /* MIDI pitch-bend high range */
uint8_t loopmode; /* 0=no, 1=forward, 2=forward/back (see sox_loop_... values) */
unsigned nloops; /* number of active loops (max SOX_MAX_NLOOPS) */
} sox_instrinfo_t;
/* File buffer info. Holds info so that data can be read in blocks. */
typedef struct sox_fileinfo_t {
char *buf; /* Pointer to data buffer */
size_t size; /* Size of buffer in bytes */
size_t count; /* Count read into buffer */
size_t pos; /* Position in buffer */
} sox_fileinfo_t;
typedef struct sox_format_t sox_format_t; /* file format definition */
/* Handler structure defined by each format. */
typedef struct sox_format_handler_t {
unsigned sox_lib_version_code; /* Checked on load; must be 1st in struct*/
char const * description; /* short description of format */
char const * const * names; /* null-terminated array of filename extensions that are handled by this format */
unsigned int flags; /* File flags (SOX_FILE_...) */
int (*startread)(sox_format_t * ft); /* called to initialize reader (decoder) */
size_t (*read)(sox_format_t * ft, sox_sample_t *buf, size_t len); /* called to read (decode) a block of samples */
int (*stopread)(sox_format_t * ft); /* called to close reader (decoder); may be null if no closing necessary */
int (*startwrite)(sox_format_t * ft); /* called to initialize writer (encoder) */
size_t (*write)(sox_format_t * ft, const sox_sample_t *buf, size_t len); /* called to write (encode) a block of samples */
int (*stopwrite)(sox_format_t * ft); /* called to close writer (decoder); may be null if no closing necessary */
int (*seek)(sox_format_t * ft, uint64_t offset); /* called to reposition reader; may be null if not supported */
/* Array of values indicating the encodings and precisions supported for
* writing (encoding). Precisions specified with default precision first.
* Encoding, precision, precision, ..., 0, repeat. End with one more 0.
* Example:
* unsigned const* formats = {
* SOX_ENCODING_SIGN2, 16, 24, 0, // Support SIGN2 at 16 and 24 bits, default to 16 bits.
* SOX_ENCODING_UNSIGNED, 8, 0, // Support UNSIGNED at 8 bits, default to 8 bits.
* 0 // No more supported encodings.
* };
*/
unsigned const * write_formats;
/* Array of sample rates (samples per second) supported for writing (encoding).
* NULL if all (or almost all) rates are supported. End with 0. */
sox_rate_t const * write_rates;
/* SoX will automatically allocate a buffer in which the handler can store data.
* Specify the size of the buffer needed here. Usually this will be sizeof(your_struct).
* The buffer will be allocated and zeroed before the call to startread/startwrite.
* The buffer will be freed after the call to stopread/stopwrite.
* The buffer will be provided via format.priv in each call to the handler. */
size_t priv_size;
} sox_format_handler_t;
/*
* Format information for input and output files.
*/
/* File's metadata. Access via sox_..._comments functions. */
typedef char * * sox_comments_t;
size_t sox_num_comments(sox_comments_t comments); /* Returns the number of items in the metadata block. */
void sox_append_comment(sox_comments_t * comments, char const * comment); /* Adds a "id=value" item to the metadata block. */
void sox_append_comments(sox_comments_t * comments, char const * comment); /* Adds a newline-delimited list of "id=value" items to the metadata block. */
sox_comments_t sox_copy_comments(sox_comments_t comments); /* Duplicates the metadata block. */
void sox_delete_comments(sox_comments_t * comments); /* Frees the metadata block. */
char const * sox_find_comment(sox_comments_t comments, char const * id); /* If "id=value" is found, return value, else return null. */
#define SOX_MAX_NLOOPS 8
/* comments, instrument info, loop info (out-of-band data) */
typedef struct sox_oob_t{
/* Decoded: */
sox_comments_t comments; /* Comment strings in id=value format. */
sox_instrinfo_t instr; /* Instrument specification */
sox_loopinfo_t loops[SOX_MAX_NLOOPS]; /* Looping specification */
/* TBD: Non-decoded chunks, etc: */
} sox_oob_t;
/* Is file a real file, a pipe, or a url? */
typedef enum lsx_io_type
{
lsx_io_file,
lsx_io_pipe,
lsx_io_url
} lsx_io_type;
struct sox_format_t { /* Data passed to/from the format handler */
char * filename; /* File name */
/* Signal specifications for reader (decoder) or writer (encoder):
* sample rate, #channels, precision, length, headroom multiplier.
* Any info specified by the user is here on entry to startread or
* startwrite. Info will be SOX_UNSPEC if the user provided no info.
* At exit from startread, should be completely filled in, using
* either data from the file's headers (if available) or whatever
* the format is guessing/assuming (if header data is not available).
* At exit from startwrite, should be completely filled in, using
* either the data that was specified, or values chosen by the format
* based on the format's defaults or capabilities. */
sox_signalinfo_t signal;
/* Encoding specifications for reader (decoder) or writer (encoder):
* encoding (sample format), bits per sample, compression rate, endianness.
* Should be filled in by startread. Values specified should be used
* by startwrite when it is configuring the encoding parameters. */
sox_encodinginfo_t encoding;
char * filetype; /* Type of file, as determined by header inspection or libmagic. */
sox_oob_t oob; /* comments, instrument info, loop info (out-of-band data) */
sox_bool seekable; /* Can seek on this file */
char mode; /* Read or write mode ('r' or 'w') */
size_t olength; /* Samples * chans written to file */
size_t clips; /* Incremented if clipping occurs */
int sox_errno; /* Failure error code */
char sox_errstr[256]; /* Failure error text */
FILE * fp; /* File stream pointer */
lsx_io_type io_type; /* Stores whether this is a file, pipe or URL */
long tell_off; /* Current offset within file */
long data_start; /* Offset at which headers end and sound data begins (set by lsx_check_read_params) */
sox_format_handler_t handler; /* Format handler for this file */
void * priv; /* Format handler's private data area */
};
/* File flags field */
#define SOX_FILE_NOSTDIO 0x0001 /* Does not use stdio routines */
#define SOX_FILE_DEVICE 0x0002 /* File is an audio device */
#define SOX_FILE_PHONY 0x0004 /* Phony file/device (i.e. nulfile) */
#define SOX_FILE_REWIND 0x0008 /* File should be rewound to write header */
#define SOX_FILE_BIT_REV 0x0010 /* Is file bit-reversed? */
#define SOX_FILE_NIB_REV 0x0020 /* Is file nibble-reversed? */
#define SOX_FILE_ENDIAN 0x0040 /* Is file format endian? */
#define SOX_FILE_ENDBIG 0x0080 /* For endian file format, is it big endian? */
#define SOX_FILE_MONO 0x0100 /* Do channel restrictions allow mono? */
#define SOX_FILE_STEREO 0x0200 /* Do channel restrictions allow stereo? */
#define SOX_FILE_QUAD 0x0400 /* Do channel restrictions allow quad? */
#define SOX_FILE_CHANS (SOX_FILE_MONO | SOX_FILE_STEREO | SOX_FILE_QUAD) /* No channel restrictions */
#define SOX_FILE_LIT_END (SOX_FILE_ENDIAN | 0) /* File is little-endian */
#define SOX_FILE_BIG_END (SOX_FILE_ENDIAN | SOX_FILE_ENDBIG) /* File is big-endian */
int sox_format_init(void); /* Find & load format handler plugins. */
void sox_format_quit(void); /* Unload format handler plugins. */
int sox_init(void); /* Initialize effects library. */
int sox_quit(void); /* Close effects library and unload format handler plugins. */
/* callback to retrieve information about a format handler */
typedef const sox_format_handler_t *(*sox_format_fn_t)(void);
/* Information about a loaded format handler: name and function pointer */
typedef struct sox_format_tab_t {
char *name; /* Name of format handler */
sox_format_fn_t fn; /* Function to call to get format handler's information */
} sox_format_tab_t;
/* the table of format handler names and functions */
extern sox_format_tab_t sox_format_fns[];
/* Opens a decoding session for a file. Returned handle must be closed with sox_close(). */
sox_format_t * sox_open_read(
char const * path, /* Path to file to be opened (required). */
sox_signalinfo_t const * signal, /* Information already known about audio stream, or NULL if none. */
sox_encodinginfo_t const * encoding, /* Information already known about sample encoding, or NULL if none. */
char const * filetype); /* Previously-determined file type, or NULL to auto-detect. */
/* Opens a decoding session for a memory buffer. Returned handle must be closed with sox_close(). */
sox_format_t * sox_open_mem_read(
void * buffer, /* Pointer to audio data buffer (required). */
size_t buffer_size, /* Number of bytes to read from audio data buffer. */
sox_signalinfo_t const * signal, /* Information already known about audio stream, or NULL if none. */
sox_encodinginfo_t const * encoding, /* Information already known about sample encoding, or NULL if none. */
char const * filetype); /* Previously-determined file type, or NULL to auto-detect. */
/* Returns true if the format handler for the specified file type supports the specified encoding. */
sox_bool sox_format_supports_encoding(
char const * path, /* Path to file to be examined (required if filetype is NULL). */
char const * filetype, /* Previously-determined file type, or NULL to use extension from path. */
sox_encodinginfo_t const * encoding); /* Encoding for which format handler should be queried. */
/* Gets the format handler for a specified file type. */
sox_format_handler_t const * sox_write_handler(
char const * path, /* Path to file (required if filetype is NULL). */
char const * filetype, /* Filetype for which handler is needed, or NULL to use extension from path. */
char const * * filetype1); /* Receives the filetype that was detected. Pass NULL if not needed. */
/* Opens an encoding session for a file. Returned handle must be closed with sox_close(). */
sox_format_t * sox_open_write(
char const * path, /* Path to file to be written (required). */
sox_signalinfo_t const * signal, /* Information about desired audio stream (required). */
sox_encodinginfo_t const * encoding, /* Information about desired sample encoding, or NULL to use defaults. */
char const * filetype, /* Previously-determined file type, or NULL to auto-detect. */
sox_oob_t const * oob, /* Out-of-band data to add to file, or NULL if none. */
sox_bool (*overwrite_permitted)(const char *filename)); /* Called if file exists to determine whether overwrite is ok. */
/* Opens an encoding session for a memory buffer. Returned handle must be closed with sox_close(). */
sox_format_t * sox_open_mem_write(
void * buffer, /* Pointer to audio data buffer that will receive data (required). */
size_t buffer_size, /* Maximum number of bytes to write to audio data buffer. */
sox_signalinfo_t const * signal, /* Information about desired audio stream (required). */
sox_encodinginfo_t const * encoding, /* Information about desired sample encoding, or NULL to use defaults. */
char const * filetype, /* Previously-determined file type, or NULL to auto-detect. */
sox_oob_t const * oob); /* Out-of-band data to add to file, or NULL if none. */
/* Opens an encoding session for a memstream buffer. Returned handle must be closed with sox_close(). */
sox_format_t * sox_open_memstream_write(
char * * buffer_ptr, /* Receives pointer to audio data buffer that receives data (required). */
size_t * buffer_size_ptr, /* Receives size of data written to audio data buffer (required). */
sox_signalinfo_t const * signal, /* Information about desired audio stream (required). */
sox_encodinginfo_t const * encoding, /* Information about desired sample encoding, or NULL to use defaults. */
char const * filetype, /* Previously-determined file type, or NULL to auto-detect. */
sox_oob_t const * oob); /* Out-of-band data to add to file, or NULL if none. */
/* Reads samples from a decoding session into a sample buffer. Returns # of samples decoded, or 0 for EOF. */
size_t sox_read(sox_format_t * ft, sox_sample_t *buf, size_t len);
/* Writes samples to an encoding session from a sample buffer. Returns # of samples encoded. */
size_t sox_write(sox_format_t * ft, const sox_sample_t *buf, size_t len);
/* Closes an encoding or decoding session. */
int sox_close(sox_format_t * ft);
#define SOX_SEEK_SET 0
/* Sets the location at which next samples will be decoded. Returns SOX_SUCCESS if successful. */
int sox_seek(sox_format_t * ft, uint64_t offset, int whence);
/* Finds a format handler by name. */
sox_format_handler_t const * sox_find_format(char const * name, sox_bool ignore_devices);
/*
* Structures for effects.
*/
#define SOX_MAX_EFFECTS 20
#define SOX_EFF_CHAN 1 /* Effect might alter the number of channels */
#define SOX_EFF_RATE 2 /* Effect might alter sample rate */
#define SOX_EFF_PREC 4 /* Effect might alter sample precision */
#define SOX_EFF_LENGTH 8 /* Effect might alter audio length */
#define SOX_EFF_MCHAN 16 /* Effect handles multiple channels internally */
#define SOX_EFF_NULL 32 /* Effect does nothing (can be optimized out of flow) */
#define SOX_EFF_DEPRECATED 64 /* Effect will soon be removed from SoX */
#define SOX_EFF_GAIN 128 /* Effect does not support gain -r */
#define SOX_EFF_MODIFY 256 /* Effect does not modify samples (just watches as data goes through) */
#define SOX_EFF_ALPHA 512 /* Effect is experimental/incomplete */
#define SOX_EFF_INTERNAL 1024 /* Effect present libSoX but not valid for use by SoX command-line tools */
typedef enum sox_plot_t {
sox_plot_off,
sox_plot_octave,
sox_plot_gnuplot,
sox_plot_data
} sox_plot_t;
typedef struct sox_effect_t sox_effect_t;
/* Global parameters for effects */
typedef struct sox_effects_globals_t {
sox_plot_t plot; /* To help the user choose effect & options */
sox_globals_t * global_info; /* Pointer to associated SoX globals */
} sox_effects_globals_t;
/* Global parameters for effects */
extern sox_effects_globals_t sox_effects_globals;
/* Effect handler information */
typedef struct sox_effect_handler_t {
char const * name; /* Effect name */
char const * usage; /* Short explanation of parameters accepted by effect */
unsigned int flags; /* Combination of SOX_EFF_... flags */
int (*getopts)(sox_effect_t * effp, int argc, char *argv[]); /* Called to parse command-line arguments (called once per effect) */
int (*start)(sox_effect_t * effp); /* Called to initialize effect (called once per flow) */
int (*flow)(sox_effect_t * effp, const sox_sample_t *ibuf,
sox_sample_t *obuf, size_t *isamp, size_t *osamp); /* Called to process samples */
int (*drain)(sox_effect_t * effp, sox_sample_t *obuf, size_t *osamp); /* Called to finish getting output after input is complete */
int (*stop)(sox_effect_t * effp); /* Called to shut down effect (called once per flow) */
int (*kill)(sox_effect_t * effp); /* Called to shut down effect (called once per effect) */
size_t priv_size; /* Size of private data SoX should pre-allocate for effect */
} sox_effect_handler_t;
/* Effect information */
struct sox_effect_t {
sox_effects_globals_t * global_info; /* global effect parameters */
sox_signalinfo_t in_signal; /* Information about the incoming data stream */
sox_signalinfo_t out_signal; /* Information about the outgoing data stream */
sox_encodinginfo_t const * in_encoding; /* Information about the incoming data encoding */
sox_encodinginfo_t const * out_encoding; /* Information about the outgoing data encoding */
sox_effect_handler_t handler; /* The handler for this effect */
sox_sample_t * obuf; /* output buffer */
size_t obeg; /* output buffer consumed */
size_t oend; /* output buffer total length */
size_t imin; /* minimum input buffer size */
size_t clips; /* increment if clipping occurs */
size_t flows; /* 1 if MCHAN, # chans otherwise */
size_t flow; /* flow # */
void * priv; /* Effect's private data area */
};
/* Finds the effect handler with the given name */
sox_effect_handler_t const * sox_find_effect(char const * name);
/* Creates an effect using the given handler */
sox_effect_t * sox_create_effect(sox_effect_handler_t const * eh);
/* Applies the command-line options to the effect. Returns the number of arguments consumed. */
int sox_effect_options(sox_effect_t *effp, int argc, char * const argv[]);
/* Effects chain */
/* Function that returns information about an effect handler */
typedef const sox_effect_handler_t *(*sox_effect_fn_t)(void);
/* Array of known effect handlers */
extern sox_effect_fn_t sox_effect_fns[];
/* Chain of effects to be applied to a stream */
typedef struct sox_effects_chain_t {
sox_effect_t * effects[SOX_MAX_EFFECTS]; /* Array of effects to be applied to a stream */
unsigned length; /* Number of effects to be applied */
sox_sample_t **ibufc; /* Channel interleave buffer */
sox_sample_t **obufc; /* Channel interleave buffer */
sox_effects_globals_t global_info; /* Copy of global effects settings */
sox_encodinginfo_t const * in_enc; /* Input encoding */
sox_encodinginfo_t const * out_enc; /* Output encoding */
} sox_effects_chain_t;
/* Initializes an effects chain. Returned handle must be closed with sox_delete_effects_chain(). */
sox_effects_chain_t * sox_create_effects_chain(
sox_encodinginfo_t const * in_enc, sox_encodinginfo_t const * out_enc);
/* Closes an effects chain. */
void sox_delete_effects_chain(sox_effects_chain_t *ecp);
/* Adds an effect to the effects chain, returns SOX_SUCCESS if successful. */
int sox_add_effect( sox_effects_chain_t * chain, sox_effect_t * effp, sox_signalinfo_t * in, sox_signalinfo_t const * out);
/* Runs the effects chain, returns SOX_SUCCESS if successful. */
int sox_flow_effects(sox_effects_chain_t *, int (* callback)(sox_bool all_done, void * client_data), void * client_data);
/* Gets the number of clips that occurred while running an effects chain */
size_t sox_effects_clips(sox_effects_chain_t *);
/* Shuts down an effect (calls stop on each of its flows) */
size_t sox_stop_effect(sox_effect_t *effp);
/* Adds an already-initialized effect to the end of the chain */
void sox_push_effect_last(sox_effects_chain_t *chain, sox_effect_t *effp);
/* Removes and returns an effect from the end of the chain */
sox_effect_t *sox_pop_effect_last(sox_effects_chain_t *chain);
/* Shut down and delete an effect */
void sox_delete_effect(sox_effect_t *effp);
/* Shut down and delete the last effect in the chain */
void sox_delete_effect_last(sox_effects_chain_t *chain);
/* Shut down and delete all effects in the chain */
void sox_delete_effects(sox_effects_chain_t *chain);
/* The following routines are unique to the trim effect.
* sox_trim_get_start can be used to find what is the start
* of the trim operation as specified by the user.
* sox_trim_clear_start will reset what ever the user specified
* back to 0.
* These two can be used together to find out what the user
* wants to trim and use a sox_seek() operation instead. After
* sox_seek()'ing, you should set the trim option to 0.
*/
size_t sox_trim_get_start(sox_effect_t * effp);
void sox_trim_clear_start(sox_effect_t * effp);
size_t sox_crop_get_start(sox_effect_t * effp);
void sox_crop_clear_start(sox_effect_t * effp);
typedef int (* sox_playlist_callback_t)(void *, char *);
/* Returns true if the specified file is a known playlist file type */
sox_bool sox_is_playlist(char const * filename);
/* Parses the specified playlist file */
int sox_parse_playlist(sox_playlist_callback_t callback, void * p, char const * const listname);
/* Converts a SoX error code into an error string. */
char const * sox_strerror(int sox_errno);
/* Writes an error message regarding the specified filename to the given output file stream */
void sox_output_message(FILE *file, const char *filename, const char *fmt, va_list ap);
/* WARNING BEGIN
*
* The items in this section are subject to instability. They only exist
* in public API because sox (the application) make use of them but
* may not be supported and may change rapidly.
*/
void lsx_fail(const char *, ...) LSX_PRINTF;
void lsx_warn(const char *, ...) LSX_PRINTF;
void lsx_report(const char *, ...) LSX_PRINTF;
void lsx_debug(const char *, ...) LSX_PRINTF;
#define lsx_fail sox_globals.subsystem=__FILE__,lsx_fail
#define lsx_warn sox_globals.subsystem=__FILE__,lsx_warn
#define lsx_report sox_globals.subsystem=__FILE__,lsx_report
#define lsx_debug sox_globals.subsystem=__FILE__,lsx_debug
typedef struct lsx_enum_item {
char const *text;
unsigned value;
} lsx_enum_item;
#define LSX_ENUM_ITEM(prefix, item) {#item, prefix##item},
lsx_enum_item const * lsx_find_enum_text(char const * text, lsx_enum_item const * lsx_enum_items, unsigned flags);
#define LSX_FET_CASE 1
lsx_enum_item const * lsx_find_enum_value(unsigned value, lsx_enum_item const * lsx_enum_items);
int lsx_enum_option(int c, lsx_enum_item const * items);
sox_bool lsx_strends(char const * str, char const * end);
char const * lsx_find_file_extension(char const * pathname);
char const * lsx_sigfigs3(double number);
char const * lsx_sigfigs3p(double percentage);
void *lsx_realloc(void *ptr, size_t newsize);
int lsx_strcasecmp(const char * s1, const char * s2);
int lsx_strncasecmp(char const * s1, char const * s2, size_t n);
/* WARNING END */
#if defined(__cplusplus)
}
#endif
#endif /* SOX_H */