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mp4库
2025-11-14 10:34:09 +08:00
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2001 - 2005. All Rights Reserved.
*
* Contributor(s):
* Dave Mackie, dmackie@cisco.com
* Alix Marchandise-Franquet, alix@cisco.com
* Bill May, wmay@cisco.com
* Kona Blend, kona8lend@gmail.com
* Robert Kausch, robert.kausch@freac.org
*/
#ifndef MP4V2_TRACK_PROP_H
#define MP4V2_TRACK_PROP_H
/**************************************************************************//**
*
* @defgroup mp4_track_prop MP4v2 Track Properties
* @{
*
*****************************************************************************/
/* specific track properties */
/** Get the track type.
*
* MP4GetTrackType gets the type of the track with the specified track id.
*
* Note: the library does not provide a MP4SetTrackType function, the
* track type needs to be specified when the track is created, e.g.
* MP4AddSystemsTrack(MP4_OCI_TRACK_TYPE).
*
* Known track types are:
*
* @li #MP4_OD_TRACK_TYPE
* @li #MP4_SCENE_TRACK_TYPE
* @li #MP4_AUDIO_TRACK_TYPE
* @li #MP4_VIDEO_TRACK_TYPE
* @li #MP4_HINT_TRACK_TYPE
* @li #MP4_CNTL_TRACK_TYPE
* @li #MP4_TEXT_TRACK_TYPE
* @li #MP4_CLOCK_TRACK_TYPE
* @li #MP4_MPEG7_TRACK_TYPE
* @li #MP4_OCI_TRACK_TYPE
* @li #MP4_IPMP_TRACK_TYPE
* @li #MP4_MPEGJ_TRACK_TYPE
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
*
* @return On success, a string indicating track type. On failure, NULL.
*/
MP4V2_EXPORT
const char* MP4GetTrackType(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the name of the track's media data atom.
*
* MP4GetTrackMediaDataName returns the four character name of the specified
* track's media data atom, i.e. the child atom of the track's @b stsd atom.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the media data atom name is
* desired.
*
* @return The name of the track's media data atom or NULL in case of an
* error.
*/
MP4V2_EXPORT
const char* MP4GetTrackMediaDataName(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the name of an encrypted track's original media data atom.
*
* MP4GetTrackMediaDataOriginalFormat is used to get the original media data
* atom name if a track has been encrypted. The track identified by @p trackId
* must be an encrypted track with @b encv as the media data name returned by
* MP4GetTrackMediaDataName.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the encoded track for which the original media
* data atom name is desired.
* @param originalFormat specifies a buffer to receive the original media data
atom name.
* @param buflen specifies the size of the buffer pointed to by @p
* originalFormat.
*
* @return <b>true</b> on success, <b>false</b> on failure.
*/
MP4V2_EXPORT
bool MP4GetTrackMediaDataOriginalFormat(
MP4FileHandle hFile,
MP4TrackId trackId,
char* originalFormat,
uint32_t buflen );
/** Get the duration of a track.
*
* MP4GetTrackDuration returns the total duration of all the samples in the
* specified track in the mp4 file.
*
* Caveat: The value is in units of the track time scale.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the duration is desired.
*
* @return The duration in track time scale units of the track in the mp4
* file.
*/
MP4V2_EXPORT
MP4Duration MP4GetTrackDuration(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the time scale of a track.
*
* MP4GetTrackTimeScale returns the time scale of the specified track in
* the mp4 file. The time scale determines the number of clock ticks per
* second for this track.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
*
* @return timescale (ticks per second) of the track in the mp4 file.
*/
MP4V2_EXPORT
uint32_t MP4GetTrackTimeScale(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Set the time scale of a track.
*
* MP4SetTrackTimeScale sets the time scale of the specified track in the
* mp4 file. The time scale determines the number of clock ticks per
* second for this track.
*
* Typically this value is set once when the track is created. However
* this call can be used to modify the value if that is desired. Since
* track sample durations are expressed in units of the track time scale,
* any change to the time scale value will effect the real time duration
* of the samples.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param value desired time scale for the track.
*
* @return <b>true</b> on success, <b>false</b> on failure.
*/
MP4V2_EXPORT
bool MP4SetTrackTimeScale(
MP4FileHandle hFile,
MP4TrackId trackId,
uint32_t value );
/** Get ISO-639-2/T language code of a track.
* The language code is a 3-char alpha code consisting of lower-case letters.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param code buffer to hold 3-char+null (4-bytes total).
*
* @return <b>true</b> on success, <b>false</b> on failure.
*/
MP4V2_EXPORT
bool MP4GetTrackLanguage(
MP4FileHandle hFile,
MP4TrackId trackId,
char* code );
/** Set ISO-639-2/T language code of a track.
* The language code is a 3-char alpha code consisting of lower-case letters.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param code 3-char language code.
*
* @return <b>true</b> on success, <b>false</b> on failure.
*/
MP4V2_EXPORT
bool MP4SetTrackLanguage(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* code );
/** Get track name.
*
* MP4GetTrackName gets the name of the track via udta.name property.
*
* The memory to store the track name is allocated by the library, so the
* caller is responsible for freeing it with MP4Free().
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param name pointer to a variable to receive the track name.
*
* @return <b>true</b> on success, <b>false</b> on failure.
*/
MP4V2_EXPORT
bool MP4GetTrackName(
MP4FileHandle hFile,
MP4TrackId trackId,
char** name );
/** Set track name.
*
* MP4SetTrackName sets the name of the track via udta.name property.
* The udta atom is created if needed.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param name the name to set as the track name.
*
* @return <b>true</b> on success, <b>false</b> on failure.
*/
MP4V2_EXPORT
bool MP4SetTrackName(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* name );
/** Get the encoding type of an MPEG-4 audio track.
*
* MP4GetTrackAudioMpeg4Type returns the MPEG-4 encoding type of the specified
* MPEG-4 audio track in the mp4 file. If an mp4 audio track has type
* MP4_MPEG4_AUDIO_TYPE, this call can be used to determine which specific
* MPEG-4 audio encoding is contained in the track.
*
* Known MPEG-4 audio encoding types are:
*
* Type | Description
* ------------------------------------|--------------------------------------
* MP4_MPEG4_AAC_MAIN_AUDIO_TYPE | MPEG-4 AAC Main profile
* MP4_MPEG4_AAC_LC_AUDIO_TYPE | MPEG-4 AAC Low Complexity profile
* MP4_MPEG4_AAC_SSR_AUDIO_TYPE | MPEG-4 AAC SSR profile
* MP4_MPEG4_AAC_LTP_AUDIO_TYPE | MPEG-4 AAC Long Term Prediction profile
* MP4_MPEG4_AAC_SCALABLE_AUDIO_TYPE | MPEG-4 AAC Scalable
* MP4_MPEG4_CELP_AUDIO_TYPE | MPEG-4 CELP
* MP4_MPEG4_HVXC_AUDIO_TYPE | MPEG-4 HVXC
* MP4_MPEG4_TTSI_AUDIO_TYPE | MPEG-4 Text To Speech
* MP4_MPEG4_MAIN_SYNTHETIC_AUDIO_TYPE | MPEG-4 Main Synthetic profile
* MP4_MPEG4_WAVETABLE_AUDIO_TYPE | MPEG-4 Wavetable Synthesis profile
* MP4_MPEG4_MIDI_AUDIO_TYPE | MPEG-4 MIDI profile
* MP4_MPEG4_ALGORITHMIC_FX_AUDIO_TYPE | MPEG-4 Algorithmic Synthesis and Audio FX profile
*
* Note: This information is retrieved from the audio track ES configuration.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the MPEG-4 audio type is
* desired.
*
* @return Upon success, the MPEG-4 audio type of the track. Upon error,
* MP4_MPEG4_INVALID_AUDIO_TYPE is returned.
*
* @see MP4GetTrackAudioType()
*/
MP4V2_EXPORT
uint8_t MP4GetTrackAudioMpeg4Type(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the encoding object type id from a track's esds atom.
*
* MP4GetTrackEsdsObjectTypeId returns the encoding object type of the
* specified audio or video track in the mp4 file.
*
* Known audio object types are:
*
* Type | Description
* ------------------------------|--------------------------------------------
* MP4_MPEG1_AUDIO_TYPE | MPEG-1 Audio Layers I, II, & III
* MP4_MPEG2_AUDIO_TYPE | MPEG-2 low bitrate extensions to MPEG-1 Audio
* ^ | MP4_MP3_AUDIO_TYPE is an alias for this value
* MP4_MPEG2_AAC_MAIN_AUDIO_TYPE | MPEG-2 AAC Main profile
* MP4_MPEG2_AAC_LC_AUDIO_TYPE | MPEG-2 AAC Low Complexity profile
* MP4_MPEG2_AAC_SSR_AUDIO_TYPE | MPEG-2 AAC SSR profile
* MP4_MPEG4_AUDIO_TYPE | MPEG-4 Audio, includes MPEG-4 extensions to AAC
* MP4_PRIVATE_AUDIO_TYPE | User private type
*
* Known video object types are:
*
* Type | Description
* -----------------------------|---------------------------------------------
* MP4_MPEG1_VIDEO_TYPE | MPEG-1 Video
* MP4_MPEG2_SIMPLE_VIDEO_TYPE | MPEG-2 Simple Profile Video
* MP4_MPEG2_MAIN_VIDEO_TYPE | MPEG-2 Main Profile Video (Broadcast/DVD)
* MP4_MPEG2_SNR_VIDEO_TYPE | MPEG-2 SNR Profile Video
* MP4_MPEG2_SPATIAL_VIDEO_TYPE | MPEG-2 Spatial Scalability Profile Video
* MP4_MPEG2_HIGH_VIDEO_TYPE | MPEG-2 High Profile Video (HDTV)
* MP4_MPEG2_442_VIDEO_TYPE | MPEG-2 442 Profile Video (Studio)
* MP4_MPEG4_VIDEO_TYPE | MPEG-4 Video
* MP4_JPEG_VIDEO_TYPE | JPEG stills or motion JPEG
* MP4_PRIVATE_VIDEO_TYPE | User private type
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the encoding object type is
* desired.
*
* @return Upon success, the encoding object type of the track. Upon error,
* MP4_INVALID_AUDIO_TYPE is returned.
*/
MP4V2_EXPORT
uint8_t MP4GetTrackEsdsObjectTypeId(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the fixed duration of samples in a track.
*
* MP4GetTrackFixedSampleDuration returns the duration of samples in the
* specified track in the mp4 file, if this value is fixed for all samples.
* This is typically the case for audio tracks and video tracks. If the track
* samples have variable duration, then MP4_INVALID_DURATION is returned.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track to which the operation applies.
*
* @return Upon success, the number of fixed duration of the samples in the
* track in track time scale units. Upon an error, MP4_INVALID_DURATION.
*/
MP4V2_EXPORT
MP4Duration MP4GetTrackFixedSampleDuration(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the average bit rate in bits per second of the specified track.
*
* MP4GetTrackBitRate returns the average bit rate in bits per second in the
* specified track in the mp4 file.
*
* Note: hint tracks will not return their bit rate via this mechanism.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the bit rate is desired.
*
* @return Upon success, the average bit rate in bits per second of the track.
* Upon an error, 0.
*/
MP4V2_EXPORT
uint32_t MP4GetTrackBitRate(
MP4FileHandle hFile,
MP4TrackId trackId );
MP4V2_EXPORT
bool MP4GetTrackVideoMetadata(
MP4FileHandle hFile,
MP4TrackId trackId,
uint8_t** ppConfig,
uint32_t* pConfigSize );
/** Get the elementary stream (ES) configuration of a track.
*
* MP4GetTrackESConfiguration returns the elementary stream (ES) configuration
* of the specified track in the mp4 file. This information is codec specific
* and contains the configuration necessary for the given codec to decode the
* samples in the track.
*
* Caveat: the returned block of memory has been allocated by the library. The
* caller may safely modify the value without effecting the library, but the
* caller takes responsiblity for freeing the memory with MP4Free().
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the ES configuration is
* desired.
* @param ppConfig specifies a pointer to a pointer variable that will be
* given the address of the configuration information.
* @param pConfigSize specifies a pointer to a variable to hold the size of
* the ES configuration information.
*
* @return Upon success, *ppConfig will point to a newly allocated block of
* memory with the ES configuration, and *pConfigSize will indicated the
* number of bytes of the ES configuration. Upon error, *ppConfig will be
* NULL, and *pConfigSize will be 0.
*
* @see MP4SetTrackESConfiguration()
*/
MP4V2_EXPORT
bool MP4GetTrackESConfiguration(
MP4FileHandle hFile,
MP4TrackId trackId,
uint8_t** ppConfig,
uint32_t* pConfigSize );
/** Set the elementary stream (ES) configuration of a track.
*
* MP4SetTrackESConfiguration sets the elementary stream (ES) configuration of
* the specified track in the mp4 file. This information is codec specific and
* contains the configuration necessary for the given codec to decode the
* samples in the track.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId the track to which the operation applies.
* @param pConfig specifies a pointer to the ES configuration information.
* @param configSize specifies the size of the ES configuration information.
*
* @return Upon success, true (1). Upon an error, false (0).
*
* @see MP4GetTrackESConfiguration()
*/
MP4V2_EXPORT
bool MP4SetTrackESConfiguration(
MP4FileHandle hFile,
MP4TrackId trackId,
const uint8_t* pConfig,
uint32_t configSize );
/* h264 information routines */
MP4V2_EXPORT
bool MP4GetTrackH264ProfileLevel(
MP4FileHandle hFile,
MP4TrackId trackId,
uint8_t* pProfile,
uint8_t* pLevel );
MP4V2_EXPORT
bool MP4GetTrackH264SeqPictHeaders(
MP4FileHandle hFile,
MP4TrackId trackId,
uint8_t*** pSeqHeaders,
uint32_t** pSeqHeaderSize,
uint8_t*** pPictHeader,
uint32_t** pPictHeaderSize );
/** Frees the memory allocated by MP4GetTrackH264SeqPictHeaders.
*
* MP4FreeH264SeqPictHeaders frees the memory that was allocated by a
* call to the MP4GetTrackH264SeqPictHeaders function.
*
* When a client application wants to extract the H.264 video data from
* an MP4 file it will call MP4GetTrackH264SeqPictHeaders to obtain the
* sequence and picture parameter sets. These parameter sets are
* required for decoding a sequence of one, or more, coded slices. When
* the client application is done with the data it must free it. On the
* Windows platform this cannot be done directly by the client
* application because the C runtime of the client application and the C
* runtime of the mp4v2 DLL may be different, which will result in an
* error at runtime. This function allows the client application to let
* the mp4v2 DLL free the memory with the appropriate CRT heap manager.
*
* @param pSeqHeaders pointer to an array of SPS pointers.
* @param pSeqHeaderSize pointer to array of SPS sizes.
* @param pPictHeader pointer to an array of PPS pointers.
* @param pPictHeaderSize pointer to array of PPS sizes.
*/
MP4V2_EXPORT
void MP4FreeH264SeqPictHeaders(
uint8_t** pSeqHeaders,
uint32_t* pSeqHeaderSize,
uint8_t** pPictHeader,
uint32_t* pPictHeaderSize );
MP4V2_EXPORT
bool MP4GetTrackH264LengthSize(
MP4FileHandle hFile,
MP4TrackId trackId,
uint32_t* pLength );
/** Get the number of samples in a track.
*
* MP4GetTrackNumberOfSamples returns the number of samples in the specified
* track in the mp4 file. Sample id's are the consecutive sequence of numbers
* from 1 to the total number of samples, i.e. 1-based indexing, not 0-based
* indexing.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the number of samples is
* desired.
*
* @return Upon success, the number of samples in the track. Upon an error, 0.
*/
MP4V2_EXPORT
MP4SampleId MP4GetTrackNumberOfSamples(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the video width in pixels of the specified video track.
*
* MP4GetTrackVideoWidth returns the width of the video in pixels in the
* specified track in the mp4 file.
*
* Caveat: Not all mp4 implementations set this value accurately. The mp4
* specification states that the authoritative values are contained in the
* track ES configuration which is video encoding specific, and hence not
* interpretable by the mp4 library.
*
* If the value of 320 is returned, care should be taken to verify the
* accuracy of this value since this is the default value in the mp4
* specification.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the video width is desired.
*
* @return Upon success, the number of pixels of the video width in the
* track. Upon an error, 0.
*
* @see MP4GetTrackVideoHeight()
* @see MP4GetTrackESConfiguration()
*/
MP4V2_EXPORT
uint16_t MP4GetTrackVideoWidth(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the video height in pixels of the specified video track.
*
* MP4GetTrackVideoHeight returns the height of the video in pixels in the
* specified track in the mp4 file.
*
* Caveat: Not all mp4 implementations set this value accurately. The mp4
* specification states that the authoritative values are contained in the
* track ES configuration which is video encoding specific, and hence not
* interpretable by the mp4 library.
*
* If the value of 240 is returned, care should be taken to verify the
* accuracy of this value since this is the default value in the mp4
* specification.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the video height is desired.
*
* @return Upon success, the number of pixels of the video height in the
* track. Upon an error, 0.
*
* @see MP4GetTrackVideoWidth()
* @see MP4GetTrackESConfiguration()
*/
MP4V2_EXPORT
uint16_t MP4GetTrackVideoHeight(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the video frame rate of the specified video track.
*
* MP4GetTrackVideoFrameRate returns the frame rate of the video in the
* specified track in the mp4 file. If the video is variable rate, the average
* frame rate is returned.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the video frame rate is
* desired.
*
* @return Upon success, the number of video frames per second of the track.
* Upon an error, 0.
*/
MP4V2_EXPORT
double MP4GetTrackVideoFrameRate(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Get the number of channels of the specified audio track.
*
* MP4GetTrackAudioChannels returns the number of audio channels in the
* specified track in the mp4 file.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the number of audio channels
* is desired.
*
* @return Upon success, the number of audio channels of the track. Upon an
* error, -1.
*/
MP4V2_EXPORT
int MP4GetTrackAudioChannels(
MP4FileHandle hFile,
MP4TrackId trackId );
/** Check whether a track is ISMACrypt encrypted.
*
* MP4IsIsmaCrypMediaTrack checks whether the specified track is encrypted
* using ISMACrypt.
*
* @param hFile specifies the mp4 file to which the operation applies.
* @param trackId specifies the track for which the information is desired.
*
* @return true (1) if the track is ISMACrypt encrypted, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4IsIsmaCrypMediaTrack(
MP4FileHandle hFile,
MP4TrackId trackId );
/* generic track properties */
/** Check for presence of a track atom.
*
* MP4HaveTrackAtom checks for the presence of the track atom passed in @p
* atomName. @p atomName can specify an atom path to check for atoms that are
* not direct children of the @b trak atom, e.g. "mdia.minf.stbl".
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param atomName name of the atom to check for.
*
* @return true (1) if the atom is present, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4HaveTrackAtom(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* atomName );
/** Get the value of an integer property for a track.
*
* MP4GetTrackIntegerProperty determines the value of the integer property
* identified by @p propName, e.g. "tkhd.layer", for the track identified by
* @p trackId. The value is stored in the variable pointed to by @p retVal.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to get.
* @param retVal pointer to a variable to receive the return value.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4GetTrackIntegerProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
uint64_t* retVal );
/** Get the value of a float property for a track.
*
* MP4GetTrackFloatProperty determines the value of the float property
* identified by @p propName, e.g. "tkhd.volume", for the track identified by
* @p trackId. The value is stored in the variable pointed to by @p retVal.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to get.
* @param retVal pointer to a variable to receive the return value.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4GetTrackFloatProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
float* retVal );
/** Get the value of a string property for a track.
*
* MP4GetTrackStringProperty determines the value of the string property
* identified by @p propName, e.g. "udta.hnti.sdp .sdpText", for the track
* identified by @p trackId. The value is stored in the variable pointed to by
* @p retVal.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to get.
* @param retVal pointer to a variable to receive the return value.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4GetTrackStringProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
const char** retVal );
/** Get the value of a bytes property for a track.
*
* MP4GetTrackBytesProperty determines the value of the bytes property
* identified by @p propName, e.g. "tkhd.matrix", for the track identified by
* @p trackId. The value is stored in a newly allocated buffer the location of
* which is assigned to the variable pointed to by ppValue. The caller is
* responsible for freeing the memory with MP4Free().
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to get.
* @param ppValue pointer to a variable to receive the memory location
* containing the property bytes.
* @param pValueSize pointer to a variable to receive the length of the
* property bytes value.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4GetTrackBytesProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
uint8_t** ppValue,
uint32_t* pValueSize );
/** Set the value of an integer property for a track.
*
* MP4SetTrackIntegerProperty sets the value of the integer property
* identified by @p propName, e.g. "tkhd.layer", for the track identified by
* @p trackId.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to set.
* @param value the new value of the property.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4SetTrackIntegerProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
int64_t value );
/** Set the value of a float property for a track.
*
* MP4SetTrackFloatProperty sets the value of the float property identified by
* @p propName, e.g. "tkhd.volume", for the track identified by @p trackId.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to set.
* @param value the new value of the property.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4SetTrackFloatProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
float value );
/** Set the value of a string property for a track.
*
* MP4SetTrackStringProperty sets the value of the string property identified
* by @p propName, e.g. "udta.hnti.sdp .sdpText", for the track identified by
* @p trackId.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to set.
* @param value the new value of the property.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4SetTrackStringProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
const char* value );
/** Set the value of a bytes property for a track.
*
* MP4SetTrackBytesProperty sets the value of the bytes property identified by
* @p propName, e.g. "tkhd.matrix", for the track identified by @p trackId.
*
* @param hFile handle of file for operation.
* @param trackId id of track for operation.
* @param propName path to the property to set.
* @param pValue pointer the bytes representing the new value of the property.
* @param valueSize the size of the bytes value pointed to by <b>pValue</b>.
*
* @return true (1) on success, false (0) otherwise.
*/
MP4V2_EXPORT
bool MP4SetTrackBytesProperty(
MP4FileHandle hFile,
MP4TrackId trackId,
const char* propName,
const uint8_t* pValue,
uint32_t valueSize);
/** @} ***********************************************************************/
#endif /* MP4V2_TRACK_PROP_H */
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