28ad2e8c72
Fixes various bugs, including several ones with security relevance. Changes: https://github.com/xiph/vorbis/releases/tag/v1.3.7
435 lines
17 KiB
C++
435 lines
17 KiB
C++
/********************************************************************
|
|
* *
|
|
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
|
|
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
|
|
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
|
|
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
|
|
* *
|
|
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
|
|
* by the Xiph.Org Foundation https://xiph.org/ *
|
|
* *
|
|
********************************************************************
|
|
|
|
function: vorbis encode-engine setup
|
|
|
|
********************************************************************/
|
|
|
|
/** \file
|
|
* Libvorbisenc is a convenient API for setting up an encoding
|
|
* environment using libvorbis. Libvorbisenc encapsulates the
|
|
* actions needed to set up the encoder properly.
|
|
*/
|
|
|
|
#ifndef _OV_ENC_H_
|
|
#define _OV_ENC_H_
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif /* __cplusplus */
|
|
|
|
#include "codec.h"
|
|
|
|
/**
|
|
* This is the primary function within libvorbisenc for setting up managed
|
|
* bitrate modes.
|
|
*
|
|
* Before this function is called, the \ref vorbis_info
|
|
* struct should be initialized by using vorbis_info_init() from the libvorbis
|
|
* API. After encoding, vorbis_info_clear() should be called.
|
|
*
|
|
* The max_bitrate, nominal_bitrate, and min_bitrate settings are used to set
|
|
* constraints for the encoded file. This function uses these settings to
|
|
* select the appropriate encoding mode and set it up.
|
|
*
|
|
* \param vi Pointer to an initialized \ref vorbis_info struct.
|
|
* \param channels The number of channels to be encoded.
|
|
* \param rate The sampling rate of the source audio.
|
|
* \param max_bitrate Desired maximum bitrate (limit). -1 indicates unset.
|
|
* \param nominal_bitrate Desired average, or central, bitrate. -1 indicates unset.
|
|
* \param min_bitrate Desired minimum bitrate. -1 indicates unset.
|
|
*
|
|
* \return Zero for success, and negative values for failure.
|
|
*
|
|
* \retval 0 Success.
|
|
* \retval OV_EFAULT Internal logic fault; indicates a bug or heap/stack corruption.
|
|
* \retval OV_EINVAL Invalid setup request, eg, out of range argument.
|
|
* \retval OV_EIMPL Unimplemented mode; unable to comply with bitrate request.
|
|
*/
|
|
extern int vorbis_encode_init(vorbis_info *vi,
|
|
long channels,
|
|
long rate,
|
|
|
|
long max_bitrate,
|
|
long nominal_bitrate,
|
|
long min_bitrate);
|
|
|
|
/**
|
|
* This function performs step-one of a three-step bitrate-managed encode
|
|
* setup. It functions similarly to the one-step setup performed by \ref
|
|
* vorbis_encode_init but allows an application to make further encode setup
|
|
* tweaks using \ref vorbis_encode_ctl before finally calling \ref
|
|
* vorbis_encode_setup_init to complete the setup process.
|
|
*
|
|
* Before this function is called, the \ref vorbis_info struct should be
|
|
* initialized by using vorbis_info_init() from the libvorbis API. After
|
|
* encoding, vorbis_info_clear() should be called.
|
|
*
|
|
* The max_bitrate, nominal_bitrate, and min_bitrate settings are used to set
|
|
* constraints for the encoded file. This function uses these settings to
|
|
* select the appropriate encoding mode and set it up.
|
|
*
|
|
* \param vi Pointer to an initialized vorbis_info struct.
|
|
* \param channels The number of channels to be encoded.
|
|
* \param rate The sampling rate of the source audio.
|
|
* \param max_bitrate Desired maximum bitrate (limit). -1 indicates unset.
|
|
* \param nominal_bitrate Desired average, or central, bitrate. -1 indicates unset.
|
|
* \param min_bitrate Desired minimum bitrate. -1 indicates unset.
|
|
*
|
|
* \return Zero for success, and negative for failure.
|
|
*
|
|
* \retval 0 Success
|
|
* \retval OV_EFAULT Internal logic fault; indicates a bug or heap/stack corruption.
|
|
* \retval OV_EINVAL Invalid setup request, eg, out of range argument.
|
|
* \retval OV_EIMPL Unimplemented mode; unable to comply with bitrate request.
|
|
*/
|
|
extern int vorbis_encode_setup_managed(vorbis_info *vi,
|
|
long channels,
|
|
long rate,
|
|
|
|
long max_bitrate,
|
|
long nominal_bitrate,
|
|
long min_bitrate);
|
|
|
|
/**
|
|
* This function performs step-one of a three-step variable bitrate
|
|
* (quality-based) encode setup. It functions similarly to the one-step setup
|
|
* performed by \ref vorbis_encode_init_vbr() but allows an application to
|
|
* make further encode setup tweaks using \ref vorbis_encode_ctl() before
|
|
* finally calling \ref vorbis_encode_setup_init to complete the setup
|
|
* process.
|
|
*
|
|
* Before this function is called, the \ref vorbis_info struct should be
|
|
* initialized by using \ref vorbis_info_init() from the libvorbis API. After
|
|
* encoding, vorbis_info_clear() should be called.
|
|
*
|
|
* \param vi Pointer to an initialized vorbis_info struct.
|
|
* \param channels The number of channels to be encoded.
|
|
* \param rate The sampling rate of the source audio.
|
|
* \param quality Desired quality level, currently from -0.1 to 1.0 (lo to hi).
|
|
*
|
|
* \return Zero for success, and negative values for failure.
|
|
*
|
|
* \retval 0 Success
|
|
* \retval OV_EFAULT Internal logic fault; indicates a bug or heap/stack corruption.
|
|
* \retval OV_EINVAL Invalid setup request, eg, out of range argument.
|
|
* \retval OV_EIMPL Unimplemented mode; unable to comply with quality level request.
|
|
*/
|
|
extern int vorbis_encode_setup_vbr(vorbis_info *vi,
|
|
long channels,
|
|
long rate,
|
|
|
|
float quality
|
|
);
|
|
|
|
/**
|
|
* This is the primary function within libvorbisenc for setting up variable
|
|
* bitrate ("quality" based) modes.
|
|
*
|
|
*
|
|
* Before this function is called, the vorbis_info struct should be
|
|
* initialized by using vorbis_info_init() from the libvorbis API. After
|
|
* encoding, vorbis_info_clear() should be called.
|
|
*
|
|
* \param vi Pointer to an initialized vorbis_info struct.
|
|
* \param channels The number of channels to be encoded.
|
|
* \param rate The sampling rate of the source audio.
|
|
* \param base_quality Desired quality level, currently from -0.1 to 1.0 (lo to hi).
|
|
*
|
|
*
|
|
* \return Zero for success, or a negative number for failure.
|
|
*
|
|
* \retval 0 Success
|
|
* \retval OV_EFAULT Internal logic fault; indicates a bug or heap/stack corruption.
|
|
* \retval OV_EINVAL Invalid setup request, eg, out of range argument.
|
|
* \retval OV_EIMPL Unimplemented mode; unable to comply with quality level request.
|
|
*/
|
|
extern int vorbis_encode_init_vbr(vorbis_info *vi,
|
|
long channels,
|
|
long rate,
|
|
|
|
float base_quality
|
|
);
|
|
|
|
/**
|
|
* This function performs the last stage of three-step encoding setup, as
|
|
* described in the API overview under managed bitrate modes.
|
|
*
|
|
* Before this function is called, the \ref vorbis_info struct should be
|
|
* initialized by using vorbis_info_init() from the libvorbis API, one of
|
|
* \ref vorbis_encode_setup_managed() or \ref vorbis_encode_setup_vbr() called to
|
|
* initialize the high-level encoding setup, and \ref vorbis_encode_ctl()
|
|
* called if necessary to make encoding setup changes.
|
|
* vorbis_encode_setup_init() finalizes the highlevel encoding structure into
|
|
* a complete encoding setup after which the application may make no further
|
|
* setup changes.
|
|
*
|
|
* After encoding, vorbis_info_clear() should be called.
|
|
*
|
|
* \param vi Pointer to an initialized \ref vorbis_info struct.
|
|
*
|
|
* \return Zero for success, and negative values for failure.
|
|
*
|
|
* \retval 0 Success.
|
|
* \retval OV_EFAULT Internal logic fault; indicates a bug or heap/stack corruption.
|
|
*
|
|
* \retval OV_EINVAL Attempt to use vorbis_encode_setup_init() without first
|
|
* calling one of vorbis_encode_setup_managed() or vorbis_encode_setup_vbr() to
|
|
* initialize the high-level encoding setup
|
|
*
|
|
*/
|
|
extern int vorbis_encode_setup_init(vorbis_info *vi);
|
|
|
|
/**
|
|
* This function implements a generic interface to miscellaneous encoder
|
|
* settings similar to the classic UNIX 'ioctl()' system call. Applications
|
|
* may use vorbis_encode_ctl() to query or set bitrate management or quality
|
|
* mode details by using one of several \e request arguments detailed below.
|
|
* vorbis_encode_ctl() must be called after one of
|
|
* vorbis_encode_setup_managed() or vorbis_encode_setup_vbr(). When used
|
|
* to modify settings, \ref vorbis_encode_ctl() must be called before \ref
|
|
* vorbis_encode_setup_init().
|
|
*
|
|
* \param vi Pointer to an initialized vorbis_info struct.
|
|
*
|
|
* \param number Specifies the desired action; See \ref encctlcodes "the list
|
|
* of available requests".
|
|
*
|
|
* \param arg void * pointing to a data structure matching the request
|
|
* argument.
|
|
*
|
|
* \retval 0 Success. Any further return information (such as the result of a
|
|
* query) is placed into the storage pointed to by *arg.
|
|
*
|
|
* \retval OV_EINVAL Invalid argument, or an attempt to modify a setting after
|
|
* calling vorbis_encode_setup_init().
|
|
*
|
|
* \retval OV_EIMPL Unimplemented or unknown request
|
|
*/
|
|
extern int vorbis_encode_ctl(vorbis_info *vi,int number,void *arg);
|
|
|
|
/**
|
|
* \deprecated This is a deprecated interface. Please use vorbis_encode_ctl()
|
|
* with the \ref ovectl_ratemanage2_arg struct and \ref
|
|
* OV_ECTL_RATEMANAGE2_GET and \ref OV_ECTL_RATEMANAGE2_SET calls in new code.
|
|
*
|
|
* The \ref ovectl_ratemanage_arg structure is used with vorbis_encode_ctl()
|
|
* and the \ref OV_ECTL_RATEMANAGE_GET, \ref OV_ECTL_RATEMANAGE_SET, \ref
|
|
* OV_ECTL_RATEMANAGE_AVG, \ref OV_ECTL_RATEMANAGE_HARD calls in order to
|
|
* query and modify specifics of the encoder's bitrate management
|
|
* configuration.
|
|
*/
|
|
struct ovectl_ratemanage_arg {
|
|
int management_active; /**< nonzero if bitrate management is active*/
|
|
/** hard lower limit (in kilobits per second) below which the stream bitrate
|
|
will never be allowed for any given bitrate_hard_window seconds of time.*/
|
|
long bitrate_hard_min;
|
|
/** hard upper limit (in kilobits per second) above which the stream bitrate
|
|
will never be allowed for any given bitrate_hard_window seconds of time.*/
|
|
long bitrate_hard_max;
|
|
/** the window period (in seconds) used to regulate the hard bitrate minimum
|
|
and maximum*/
|
|
double bitrate_hard_window;
|
|
/** soft lower limit (in kilobits per second) below which the average bitrate
|
|
tracker will start nudging the bitrate higher.*/
|
|
long bitrate_av_lo;
|
|
/** soft upper limit (in kilobits per second) above which the average bitrate
|
|
tracker will start nudging the bitrate lower.*/
|
|
long bitrate_av_hi;
|
|
/** the window period (in seconds) used to regulate the average bitrate
|
|
minimum and maximum.*/
|
|
double bitrate_av_window;
|
|
/** Regulates the relative centering of the average and hard windows; in
|
|
libvorbis 1.0 and 1.0.1, the hard window regulation overlapped but
|
|
followed the average window regulation. In libvorbis 1.1 a bit-reservoir
|
|
interface replaces the old windowing interface; the older windowing
|
|
interface is simulated and this field has no effect.*/
|
|
double bitrate_av_window_center;
|
|
};
|
|
|
|
/**
|
|
* \name struct ovectl_ratemanage2_arg
|
|
*
|
|
* The ovectl_ratemanage2_arg structure is used with vorbis_encode_ctl() and
|
|
* the OV_ECTL_RATEMANAGE2_GET and OV_ECTL_RATEMANAGE2_SET calls in order to
|
|
* query and modify specifics of the encoder's bitrate management
|
|
* configuration.
|
|
*
|
|
*/
|
|
struct ovectl_ratemanage2_arg {
|
|
int management_active; /**< nonzero if bitrate management is active */
|
|
/** Lower allowed bitrate limit in kilobits per second */
|
|
long bitrate_limit_min_kbps;
|
|
/** Upper allowed bitrate limit in kilobits per second */
|
|
long bitrate_limit_max_kbps;
|
|
long bitrate_limit_reservoir_bits; /**<Size of the bitrate reservoir in bits */
|
|
/** Regulates the bitrate reservoir's preferred fill level in a range from 0.0
|
|
* to 1.0; 0.0 tries to bank bits to buffer against future bitrate spikes, 1.0
|
|
* buffers against future sudden drops in instantaneous bitrate. Default is
|
|
* 0.1
|
|
*/
|
|
double bitrate_limit_reservoir_bias;
|
|
/** Average bitrate setting in kilobits per second */
|
|
long bitrate_average_kbps;
|
|
/** Slew rate limit setting for average bitrate adjustment; sets the minimum
|
|
* time in seconds the bitrate tracker may swing from one extreme to the
|
|
* other when boosting or damping average bitrate.
|
|
*/
|
|
double bitrate_average_damping;
|
|
};
|
|
|
|
|
|
/**
|
|
* \name vorbis_encode_ctl() codes
|
|
*
|
|
* \anchor encctlcodes
|
|
*
|
|
* These values are passed as the \c number parameter of vorbis_encode_ctl().
|
|
* The type of the referent of that function's \c arg pointer depends on these
|
|
* codes.
|
|
*/
|
|
/*@{*/
|
|
|
|
/**
|
|
* Query the current encoder bitrate management setting.
|
|
*
|
|
*Argument: <tt>struct ovectl_ratemanage2_arg *</tt>
|
|
*
|
|
* Used to query the current encoder bitrate management setting. Also used to
|
|
* initialize fields of an ovectl_ratemanage2_arg structure for use with
|
|
* \ref OV_ECTL_RATEMANAGE2_SET.
|
|
*/
|
|
#define OV_ECTL_RATEMANAGE2_GET 0x14
|
|
|
|
/**
|
|
* Set the current encoder bitrate management settings.
|
|
*
|
|
* Argument: <tt>struct ovectl_ratemanage2_arg *</tt>
|
|
*
|
|
* Used to set the current encoder bitrate management settings to the values
|
|
* listed in the ovectl_ratemanage2_arg. Passing a NULL pointer will disable
|
|
* bitrate management.
|
|
*/
|
|
#define OV_ECTL_RATEMANAGE2_SET 0x15
|
|
|
|
/**
|
|
* Returns the current encoder hard-lowpass setting (kHz) in the double
|
|
* pointed to by arg.
|
|
*
|
|
* Argument: <tt>double *</tt>
|
|
*/
|
|
#define OV_ECTL_LOWPASS_GET 0x20
|
|
|
|
/**
|
|
* Sets the encoder hard-lowpass to the value (kHz) pointed to by arg. Valid
|
|
* lowpass settings range from 2 to 99.
|
|
*
|
|
* Argument: <tt>double *</tt>
|
|
*/
|
|
#define OV_ECTL_LOWPASS_SET 0x21
|
|
|
|
/**
|
|
* Returns the current encoder impulse block setting in the double pointed
|
|
* to by arg.
|
|
*
|
|
* Argument: <tt>double *</tt>
|
|
*/
|
|
#define OV_ECTL_IBLOCK_GET 0x30
|
|
|
|
/**
|
|
* Sets the impulse block bias to the the value pointed to by arg.
|
|
*
|
|
* Argument: <tt>double *</tt>
|
|
*
|
|
* Valid range is -15.0 to 0.0 [default]. A negative impulse block bias will
|
|
* direct to encoder to use more bits when incoding short blocks that contain
|
|
* strong impulses, thus improving the accuracy of impulse encoding.
|
|
*/
|
|
#define OV_ECTL_IBLOCK_SET 0x31
|
|
|
|
/**
|
|
* Returns the current encoder coupling setting in the int pointed
|
|
* to by arg.
|
|
*
|
|
* Argument: <tt>int *</tt>
|
|
*/
|
|
#define OV_ECTL_COUPLING_GET 0x40
|
|
|
|
/**
|
|
* Enables/disables channel coupling in multichannel encoding according to arg.
|
|
*
|
|
* Argument: <tt>int *</tt>
|
|
*
|
|
* Zero disables channel coupling for multichannel inputs, nonzer enables
|
|
* channel coupling. Setting has no effect on monophonic encoding or
|
|
* multichannel counts that do not offer coupling. At present, coupling is
|
|
* available for stereo and 5.1 encoding.
|
|
*/
|
|
#define OV_ECTL_COUPLING_SET 0x41
|
|
|
|
/* deprecated rate management supported only for compatibility */
|
|
|
|
/**
|
|
* Old interface to querying bitrate management settings.
|
|
*
|
|
* Deprecated after move to bit-reservoir style management in 1.1 rendered
|
|
* this interface partially obsolete.
|
|
|
|
* \deprecated Please use \ref OV_ECTL_RATEMANAGE2_GET instead.
|
|
*
|
|
* Argument: <tt>struct ovectl_ratemanage_arg *</tt>
|
|
*/
|
|
#define OV_ECTL_RATEMANAGE_GET 0x10
|
|
/**
|
|
* Old interface to modifying bitrate management settings.
|
|
*
|
|
* deprecated after move to bit-reservoir style management in 1.1 rendered
|
|
* this interface partially obsolete.
|
|
*
|
|
* \deprecated Please use \ref OV_ECTL_RATEMANAGE2_SET instead.
|
|
*
|
|
* Argument: <tt>struct ovectl_ratemanage_arg *</tt>
|
|
*/
|
|
#define OV_ECTL_RATEMANAGE_SET 0x11
|
|
/**
|
|
* Old interface to setting average-bitrate encoding mode.
|
|
*
|
|
* Deprecated after move to bit-reservoir style management in 1.1 rendered
|
|
* this interface partially obsolete.
|
|
*
|
|
* \deprecated Please use \ref OV_ECTL_RATEMANAGE2_SET instead.
|
|
*
|
|
* Argument: <tt>struct ovectl_ratemanage_arg *</tt>
|
|
*/
|
|
#define OV_ECTL_RATEMANAGE_AVG 0x12
|
|
/**
|
|
* Old interface to setting bounded-bitrate encoding modes.
|
|
*
|
|
* deprecated after move to bit-reservoir style management in 1.1 rendered
|
|
* this interface partially obsolete.
|
|
*
|
|
* \deprecated Please use \ref OV_ECTL_RATEMANAGE2_SET instead.
|
|
*
|
|
* Argument: <tt>struct ovectl_ratemanage_arg *</tt>
|
|
*/
|
|
#define OV_ECTL_RATEMANAGE_HARD 0x13
|
|
|
|
/*@}*/
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
|
|
#endif
|