Utility tools for audio and video raw media parsing. More...

Collaboration diagram for AV Parsing:

Data Structures
struct	GF_M4VDecSpecInfo

struct	ogg_audio_codec_desc

struct	GF_VorbisParser

struct	GF_M4ADecSpecInfo

Enumerations
enum	{ GF_M4A_AAC_MAIN = 1 , GF_M4A_AAC_LC = 2 , GF_M4A_AAC_SSR = 3 , GF_M4A_AAC_LTP = 4 , GF_M4A_AAC_SBR = 5 , GF_M4A_AAC_SCALABLE = 6 , GF_M4A_TWINVQ = 7 , GF_M4A_CELP = 8 , GF_M4A_HVXC = 9 , GF_M4A_TTSI = 12 , GF_M4A_MAIN_SYNTHETIC = 13 , GF_M4A_WAVETABLE_SYNTHESIS = 14 , GF_M4A_GENERAL_MIDI = 15 , GF_M4A_ALGO_SYNTH_AUDIO_FX = 16 , GF_M4A_ER_AAC_LC = 17 , GF_M4A_ER_AAC_LTP = 19 , GF_M4A_ER_AAC_SCALABLE = 20 , GF_M4A_ER_TWINVQ = 21 , GF_M4A_ER_BSAC = 22 , GF_M4A_ER_AAC_LD = 23 , GF_M4A_ER_CELP = 24 , GF_M4A_ER_HVXC = 25 , GF_M4A_ER_HILN = 26 , GF_M4A_ER_PARAMETRIC = 27 , GF_M4A_SSC = 28 , GF_M4A_AAC_PS = 29 , GF_M4A_LAYER1 = 32 , GF_M4A_LAYER2 = 33 , GF_M4A_LAYER3 = 34 , GF_M4A_DST = 35 , GF_M4A_ALS = 36 , GF_M4A_USAC = 42 }

enum	ObuType { OBU_RESERVED_0 = 0 , OBU_SEQUENCE_HEADER = 1 , OBU_TEMPORAL_DELIMITER = 2 , OBU_FRAME_HEADER = 3 , OBU_TILE_GROUP = 4 , OBU_METADATA = 5 , OBU_FRAME = 6 , OBU_REDUNDANT_FRAME_HEADER = 7 , OBU_TILE_LIST = 8 , OBU_RESERVED_9 = 9 , OBU_RESERVED_10 = 10 , OBU_RESERVED_11 = 11 , OBU_RESERVED_12 = 12 , OBU_RESERVED_13 = 13 , OBU_RESERVED_14 = 14 , OBU_PADDING = 15 }
	OBU types. More...

enum	ObuMetadataType { OBU_METADATA_TYPE_HDR_CLL = 1 , OBU_METADATA_TYPE_HDR_MDCV = 2 , OBU_METADATA_TYPE_SCALABILITY = 3 , OBU_METADATA_TYPE_ITUT_T35 = 4 , OBU_METADATA_TYPE_TIMECODE = 5 }
	OBU metadata types. More...

Functions
void	gf_media_reduce_aspect_ratio (u32 width, u32 height)

void	gf_media_get_reduced_frame_rate (u32 timescale, u32 sample_dur)

u32	gf_media_nalu_add_emulation_bytes (const u8 buffer_src, u8 buffer_dst, u32 nal_size)

u32	gf_media_nalu_emulation_bytes_add_count (u8 *buffer, u32 nal_size)

GF_M4VParser *	gf_m4v_parser_new (u8 *data, u64 data_size, Bool mpeg12video)

GF_M4VParser *	gf_m4v_parser_bs_new (GF_BitStream *bs, Bool mpeg12video)

void	gf_m4v_parser_del (GF_M4VParser *m4v)

void	gf_m4v_parser_del_no_bs (GF_M4VParser *m4v)

GF_Err	gf_m4v_parse_config (GF_M4VParser m4v, GF_M4VDecSpecInfo dsi)

void	gf_m4v_parser_reset (GF_M4VParser *m4v, u8 obj_type)

GF_Err	gf_m4v_parse_frame (GF_M4VParser m4v, GF_M4VDecSpecInfo dsi, u8 frame_type, u32 time_inc, u64 size, u64 start, Bool *is_coded)

u64	gf_m4v_get_object_start (GF_M4VParser *m4v)

GF_Err	gf_m4v_get_config (u8 rawdsi, u32 rawdsi_size, GF_M4VDecSpecInfo dsi)

GF_Err	gf_mpegv12_get_config (u8 rawdsi, u32 rawdsi_size, GF_M4VDecSpecInfo dsi)

void	gf_m4v_rewrite_pl (u8 *io_dsi, u32 io_dsi_len, u8 PL)

GF_Err	gf_m4v_rewrite_par (u8 *io_dsi, u32 io_dsi_len, s32 par_n, s32 par_d)

const char *	gf_m4v_get_profile_name (u8 video_pl)

s32	gf_mv12_next_start_code (u8 pbuffer, u32 buflen, u32 optr, u32 *scode)

s32	gf_mv12_next_slice_start (u8 pbuffer, u32 startoffset, u32 buflen, u32 slice_offset)

u8	gf_mp3_num_channels (u32 hdr)

u16	gf_mp3_sampling_rate (u32 hdr)

u16	gf_mp3_window_size (u32 hdr)

u32	gf_mp3_bit_rate (u32 hdr)

u8	gf_mp3_object_type_indication (u32 hdr)

u8	gf_mp3_layer (u32 hdr)

u16	gf_mp3_frame_size (u32 hdr)

u32	gf_mp3_get_next_header (FILE *fin)

u32	gf_mp3_get_next_header_mem (const u8 buffer, u32 size, u32 pos)

u8	gf_mp3_version (u32 hdr)

const char *	gf_mp3_version_name (u32 hdr)

Bool	gf_vorbis_parse_header (GF_VorbisParser vp, u8 data, u32 data_len)

u32	gf_vorbis_check_frame (GF_VorbisParser vp, u8 data, u32 data_len)

Bool	gf_opus_parse_header (GF_OpusConfig cfg, u8 data, u32 data_len)

u32	gf_opus_check_frame (GF_OpusConfig cfg, u8 data, u32 data_len)

u64	gf_mpegh_escaped_value (GF_BitStream *bs, u32 nBits1, u32 nBits2, u32 nBits3)

s32	gf_mpegh_get_mhas_pl (u8 ptr, u32 size, u64 chan_layout)

u32	gf_id3_read_size (GF_BitStream *bs)

u32	gf_m4a_get_channel_cfg (u32 nb_chan)

GF_Err	gf_m4a_get_config (u8 dsi, u32 dsi_size, GF_M4ADecSpecInfo cfg)

u32	gf_m4a_get_profile (GF_M4ADecSpecInfo *cfg)

GF_Err	gf_m4a_write_config (GF_M4ADecSpecInfo cfg, u8 dsi, u32 dsi_size)

GF_Err	gf_m4a_write_config_bs (GF_BitStream bs, GF_M4ADecSpecInfo cfg)

GF_Err	gf_m4a_parse_config (GF_BitStream bs, GF_M4ADecSpecInfo cfg, Bool size_known)

GF_Err	gf_m4a_parse_program_config_element (GF_BitStream bs, GF_M4ADecSpecInfo cfg)

GF_Err	gf_m4a_write_program_config_element_bs (GF_BitStream bs, GF_M4ADecSpecInfo cfg)

const char *	gf_m4a_object_type_name (u32 objectType)

const char *	gf_m4a_get_profile_name (u8 audio_pl)

Bool	gf_ac3_parser (u8 buffer, u32 buffer_size, u32 pos, GF_AC3Config *out_hdr, Bool full_parse)

Bool	gf_ac3_parser_bs (GF_BitStream bs, GF_AC3Config hdr, Bool full_parse)

Bool	gf_eac3_parser (u8 buffer, u32 buffer_size, u32 pos, GF_AC3Config *hdr, Bool full_parse)

Bool	gf_eac3_parser_bs (GF_BitStream bs, GF_AC3Config hdr, Bool full_parse)

u32	gf_eac3_get_chan_loc_count (u32 chan_loc)

u64	gf_ac3_get_channel_layout (GF_AC3Config *ac3)

u32	gf_ac3_get_total_channels (u32 acmod)

u32	gf_ac3_get_surround_channels (u32 acmod)

u32	gf_ac3_get_bitrate (u32 brcode)

GF_Err	gf_avc_get_sps_info (u8 sps, u32 sps_size, u32 sps_id, u32 width, u32 height, s32 par_n, s32 par_d)

GF_Err	gf_avc_get_pps_info (u8 pps, u32 pps_size, u32 pps_id, u32 *sps_id)

GF_Err	gf_hevc_get_sps_info (u8 sps_data, u32 sps_size, u32 sps_id, u32 width, u32 height, s32 par_n, s32 par_d)

GF_Err	gf_vvc_get_sps_info (u8 sps_data, u32 sps_size, u32 sps_id, u32 width, u32 height, s32 par_n, s32 par_d)

const char *	gf_vvc_get_profile_name (u8 video_prof)

const char *	gf_avc_hevc_get_chroma_format_name (u8 chroma_format)

const char *	gf_avc_get_profile_name (u8 profile_idc)

Bool	gf_avcc_use_extensions (u8 profile_idc)

const char *	gf_hevc_get_profile_name (u8 profile_idc)

void	gf_img_parse (GF_BitStream bs, u32 codecid, u32 width, u32 height, u8 *dsi, u32 dsi_len)

GF_Err	gf_img_jpeg_dec (u8 jpg, u32 jpg_size, u32 width, u32 height, u32 pixel_format, u8 dst, u32 dst_size, u32 dst_nb_comp)

GF_Err	gf_img_png_dec (u8 png, u32 png_size, u32 width, u32 height, u32 pixel_format, u8 dst, u32 dst_size)

GF_Err	gf_img_png_enc (u8 data, u32 width, u32 height, s32 stride, u32 pixel_format, u8 dst, u32 *dst_size)

const char *	gf_av1_get_obu_name (ObuType obu_type)

Variables
static const u32	GF_M4ASampleRates []

static const u32	GF_M4ANumChannels []

Detailed Description

This section documents the audio and video parsing functions of the GPAC framework.

Data Structure Documentation

◆ GF_M4VDecSpecInfo

struct GF_M4VDecSpecInfo

MPEG-1, MPEG-1, MPEG-4 part 2 decoder specific info (only serialized for MPEG-4)

Data Fields
u8	VideoPL	video PL
u8	RAP_stream	set if stream is RAP only
u8	objectType	MPEG-4 part 2 video object type
u8	has_shape	set if object has shape coding
u8	enh_layer	set if object is an enhancement layer
u16	width	video horizontal size
u16	height	video vertical size
u8	par_num	pixel aspect ratio numerator
u8	par_den	pixel aspect ratio denominator
u16	clock_rate	video clock rate - frames are spaced by time_increment/clock_rate seconds
u8	NumBitsTimeIncrement	number of bits to code the time increment (internal use only)
u32	time_increment	time increment between frames
Double	fps	framerate, for MPEG 1/2
u32	next_object_start	position of next object in the bitstream
Bool	progresive	progressive video sequence
u8	chroma_fmt	chroma format

◆ GF_VorbisParser

struct GF_VorbisParser

OGG Vorbis parser

Data Fields
u32	version
u32	num_headers
u32	min_block
u32	max_block
u32	max_r
u32	avg_r
u32	low_r
u32	modebits
Bool	mode_flag[64]
u32	nb_init
GF_BitStream *	vbs
u32	sample_rate
u32	channels

◆ GF_M4ADecSpecInfo

struct GF_M4ADecSpecInfo

MPEG-4 Audio decoder specific info

Data Fields
u32	nb_chan
u32	base_object_type
u32	base_sr
u32	base_sr_index
Bool	has_sbr
u32	sbr_object_type
u32	sbr_sr
u32	sbr_sr_index
Bool	has_ps
u8	audioPL
u32	chan_cfg
Bool	program_config_element_present
Bool	mono_mixdown_present
Bool	stereo_mixdown_present
Bool	matrix_mixdown_idx_present
Bool	pseudo_surround_enable
u8	element_instance_tag
u8	object_type
u8	sampling_frequency_index
u8	num_front_channel_elements
u8	num_side_channel_elements
u8	num_back_channel_elements
u8	num_lfe_channel_elements
u8	num_assoc_data_elements
u8	num_valid_cc_elements
u8	mono_mixdown_element_number
u8	stereo_mixdown_element_number
u8	matrix_mixdown_idx
u8	front_element_is_cpe[15]
u8	front_element_tag_select[15]
u8	side_element_is_cpe[15]
u8	side_element_tag_select[15]
u8	back_element_is_cpe[15]
u8	back_element_tag_select[15]
u8	lfe_element_tag_select[15]
u8	assoc_data_element_tag_select[15]
u8	cc_element_is_ind_sw[15]
u8	valid_cc_element_tag_select[15]
u8	comment_field_bytes
u8	comments[255]
u32	cpe_channels

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

MPEG-4 audio object types

Enumerator
GF_M4A_AAC_MAIN	AAC main
GF_M4A_AAC_LC	AAC LC
GF_M4A_AAC_SSR	AAC SSR
GF_M4A_AAC_LTP	AAC LTP
GF_M4A_AAC_SBR	AAC SBR
GF_M4A_AAC_SCALABLE	AAC scalable
GF_M4A_TWINVQ	TwinVQ
GF_M4A_CELP	CELP
GF_M4A_HVXC	HVXC
GF_M4A_TTSI	TTSI
GF_M4A_MAIN_SYNTHETIC	Main Synthetic
GF_M4A_WAVETABLE_SYNTHESIS	Wavetable synthesis
GF_M4A_GENERAL_MIDI	General Midi
GF_M4A_ALGO_SYNTH_AUDIO_FX	AudioFX synthesis
GF_M4A_ER_AAC_LC	Error Resilient AAC LC
GF_M4A_ER_AAC_LTP	Error Resilient AAC LTP
GF_M4A_ER_AAC_SCALABLE	Error Resilient AAC Scalable
GF_M4A_ER_TWINVQ	Error Resilient TwinVQ
GF_M4A_ER_BSAC	Error Resilient BSAC
GF_M4A_ER_AAC_LD	Error Resilient AAC LD
GF_M4A_ER_CELP	Error Resilient CELP
GF_M4A_ER_HVXC	Error Resilient HVXC
GF_M4A_ER_HILN	Error Resilient HILN
GF_M4A_ER_PARAMETRIC	Error Resilient Parametric
GF_M4A_SSC	SSC
GF_M4A_AAC_PS	AAC PS
GF_M4A_LAYER1	MPEG-1/2 layer 1
GF_M4A_LAYER2	MPEG-1/2 layer 2
GF_M4A_LAYER3	MPEG-1/2 layer 3
GF_M4A_DST	DST
GF_M4A_ALS	ALS
GF_M4A_USAC	USAC

◆ ObuType

enum ObuType

Enumerator
OBU_RESERVED_0
OBU_SEQUENCE_HEADER
OBU_TEMPORAL_DELIMITER
OBU_FRAME_HEADER
OBU_TILE_GROUP
OBU_METADATA
OBU_FRAME
OBU_REDUNDANT_FRAME_HEADER
OBU_TILE_LIST
OBU_RESERVED_9
OBU_RESERVED_10
OBU_RESERVED_11
OBU_RESERVED_12
OBU_RESERVED_13
OBU_RESERVED_14
OBU_PADDING

◆ ObuMetadataType

enum ObuMetadataType

Enumerator
OBU_METADATA_TYPE_HDR_CLL
OBU_METADATA_TYPE_HDR_MDCV
OBU_METADATA_TYPE_SCALABILITY
OBU_METADATA_TYPE_ITUT_T35
OBU_METADATA_TYPE_TIMECODE

Function Documentation

◆ gf_media_reduce_aspect_ratio()

void gf_media_reduce_aspect_ratio	(	u32 *	width,
		u32 *	height
	)

Reduces input width/height to common aspect ration num/denum values

Parameters

width	width of the aspect ratio
height	height of the aspect ratio

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◆ gf_media_get_reduced_frame_rate()

void gf_media_get_reduced_frame_rate	(	u32 *	timescale,
		u32 *	sample_dur
	)

Reduces input FPS to a more compact value (eg 25000/1000 -> 25/1)

Parameters

timescale	timescale of the aspect ratio
sample_dur	sample duration of the aspect ratio in the given timescale

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◆ gf_media_nalu_add_emulation_bytes()

u32 gf_media_nalu_add_emulation_bytes	(	const u8 *	buffer_src,
		u8 *	buffer_dst,
		u32	nal_size
	)

inserts emulation prevention bytes from buffer_src into buffer_dst

Parameters

buffer_src	source buffer (NAL without EPB)
buffer_dst	destination buffer (NAL with EPB)
nal_size	source buffer size

Returns: size of buffer after adding emulation prevention bytes

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◆ gf_media_nalu_emulation_bytes_add_count()

u32 gf_media_nalu_emulation_bytes_add_count	(	u8 *	buffer,
		u32	nal_size
	)

gets the number of emulation prevention bytes to add to a non emulated buffer

Parameters

buffer	source buffer (NAL without EPB)
nal_size	source buffer size

Returns: the number of emulation prevention bytes to add

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◆ gf_m4v_parser_new()

GF_M4VParser* gf_m4v_parser_new	(	u8 *	data,
		u64	data_size,
		Bool	mpeg12video
	)

Creates a new MPEG-1/2/4 video parser

Parameters

data	buffer to parse
data_size	size of buffer to parse
mpeg12video	if set, parses as MPEG-1 or MPEG-2

Returns: the created parser

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◆ gf_m4v_parser_bs_new()

GF_M4VParser* gf_m4v_parser_bs_new	(	GF_BitStream *	bs,
		Bool	mpeg12video
	)

Creates a new MPEG-1/2/4 video parser from a bitstream object

Parameters

bs	the bitstream object to use for parsing
mpeg12video	if set, parses as MPEG-1 or MPEG-2

Returns: the created parser

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◆ gf_m4v_parser_del()

void gf_m4v_parser_del ( GF_M4VParser * m4v )

Deletes a MPEG-1/2/4 video parser

Parameters

m4v	the mpeg video parser

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◆ gf_m4v_parser_del_no_bs()

void gf_m4v_parser_del_no_bs ( GF_M4VParser * m4v )

Deletes a MPEG-1/2/4 video parser without destroying associated bitstream

Parameters

m4v	the mpeg video parser

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◆ gf_m4v_parse_config()

GF_Err gf_m4v_parse_config	(	GF_M4VParser *	m4v,
		GF_M4VDecSpecInfo *	dsi
	)

parses the decoder specific info (if found)

Parameters

m4v	the mpeg video parser
dsi	the decoder spcific info structure to fill

Returns: GF_OK if found, GF_EOS if not enough data, error otherwise

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◆ gf_m4v_parser_reset()

void gf_m4v_parser_reset	(	GF_M4VParser *	m4v,
		u8	obj_type
	)

resets the parser

Parameters

m4v	the mpeg video parser
obj_type	if not 0, skip next start code and use (obj_type-1) for next obj parsing

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◆ gf_m4v_parse_frame()

GF_Err gf_m4v_parse_frame	(	GF_M4VParser *	m4v,
		GF_M4VDecSpecInfo *	dsi,
		u8 *	frame_type,
		u32 *	time_inc,
		u64 *	size,
		u64 *	start,
		Bool *	is_coded
	)

parses a frame. The parser ALWAYS resync on the next object in the bitstream thus you can seek the bitstream to copy the payload without re-seeking it

Parameters

m4v	the mpeg video parser
dsi	pointer to the decoder specific info parsed
frame_type	set to the frame type (I:1, P:2, B:3, 0: no frame header found)
time_inc	set to the time increment since last frame
size	set to the size of the compressed frame
start	set to the position of the first byte in the buffer/bitstream
is_coded	set to 1 if frame is coded, 0 if skip frame, untouched if no frame found

Returns: error if any

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◆ gf_m4v_get_object_start()

u64 gf_m4v_get_object_start ( GF_M4VParser * m4v )

returns current object start in bitstream

Parameters

m4v	the mpeg video parser

Returns: the the position in the buffer/bitstream

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◆ gf_m4v_get_config()

GF_Err gf_m4v_get_config	(	u8 *	rawdsi,
		u32	rawdsi_size,
		GF_M4VDecSpecInfo *	dsi
	)

decodes DSI/VOSHeader for MPEG4

Parameters

rawdsi	encoded MPEG-4 decoder config
rawdsi_size	size of encoded MPEG-4 decoder config
dsi	the decoder spcific info structure to fill

Returns: error if any

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◆ gf_mpegv12_get_config()

GF_Err gf_mpegv12_get_config	(	u8 *	rawdsi,
		u32	rawdsi_size,
		GF_M4VDecSpecInfo *	dsi
	)

decodes DSI/VOSHeader for MPEG12

Parameters

rawdsi	encoded MPEG-1/2 decoder config
rawdsi_size	size of encoded MPEG-1/2 decoder config
dsi	the decoder spcific info structure to fill

Returns: error if any

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◆ gf_m4v_rewrite_pl()

void gf_m4v_rewrite_pl	(	u8 **	io_dsi,
		u32 *	io_dsi_len,
		u8	PL
	)

rewrites Profile and Level indicator in MPEG-4 DSI

Parameters

io_dsi	encoded MPEG-4 decoder config
io_dsi_len	size of encoded MPEG-4 decoder config
PL	the new Profile/level to set

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◆ gf_m4v_rewrite_par()

GF_Err gf_m4v_rewrite_par	(	u8 **	io_dsi,
		u32 *	io_dsi_len,
		s32	par_n,
		s32	par_d
	)

rewrites PAR code in DSI. Negative values will remove the par

Parameters

io_dsi	encoded MPEG-4 decoder config
io_dsi_len	size of encoded MPEG-4 decoder config
par_n	the numerator of the new aspect ratio to write
par_d	the denominator of the new aspect ratio to write

Returns: error if any

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◆ gf_m4v_get_profile_name()

const char* gf_m4v_get_profile_name ( u8 video_pl )

returns readable description of profile

Parameters

video_pl the Profile/level

Returns: name of the profile (never NULL)

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◆ gf_mv12_next_start_code()

s32 gf_mv12_next_start_code	(	u8 *	pbuffer,
		u32	buflen,
		u32 *	optr,
		u32 *	scode
	)

returns next start code in mpeg 1/2 video buffer

Parameters

pbuffer	the video buffer
buflen	size of the video buffer
optr	set to the byte offset in the buffer
scode	set to the start code value if found

Returns: 0 if found, -1 otherwise

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◆ gf_mv12_next_slice_start()

s32 gf_mv12_next_slice_start	(	u8 *	pbuffer,
		u32	startoffset,
		u32	buflen,
		u32 *	slice_offset
	)

returns next slice start in mpeg 1/2 video buffer

Parameters

pbuffer	the video buffer
startoffset	the offset in the buffer at which analysis shall begin
buflen	size of the video buffer
slice_offset	set to the byte offset of the slice start

Returns: 0 if found, -1 otherwise

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◆ gf_mp3_num_channels()

u8 gf_mp3_num_channels ( u32 hdr )

gets the number of channels in an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the number of channels

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◆ gf_mp3_sampling_rate()

u16 gf_mp3_sampling_rate ( u32 hdr )

gets the sampling rate of an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the sampling rate

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◆ gf_mp3_window_size()

u16 gf_mp3_window_size ( u32 hdr )

gets the window size (number of samples) in an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the window size

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◆ gf_mp3_bit_rate()

u32 gf_mp3_bit_rate ( u32 hdr )

gets the bitrate of an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the bit rate

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◆ gf_mp3_object_type_indication()

u8 gf_mp3_object_type_indication ( u32 hdr )

gets the MPEG-4 object type indication of an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the object type indication

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◆ gf_mp3_layer()

u8 gf_mp3_layer ( u32 hdr )

gets the layer of an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the layer

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◆ gf_mp3_frame_size()

u16 gf_mp3_frame_size ( u32 hdr )

gets the frame size of an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the size in bytes (includes the 4 bytes header size)

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◆ gf_mp3_get_next_header()

u32 gf_mp3_get_next_header ( FILE * fin )

locates the next frame start in an MPEG-1/2/3 audio stream file

Parameters

fin	file to search

Returns: the frame header value, or 0 if not found

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◆ gf_mp3_get_next_header_mem()

u32 gf_mp3_get_next_header_mem	(	const u8 *	buffer,
		u32	size,
		u32 *	pos
	)

locates the next frame start in an MPEG-1/2/3 audio buffer

Parameters

buffer	buffer to search
size	size of buffer to search
pos	set to the start position of the frame header in the buffer

Returns: the frame header value, or 0 if not found

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◆ gf_mp3_version()

u8 gf_mp3_version ( u32 hdr )

gets the version size of an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the version

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◆ gf_mp3_version_name()

const char* gf_mp3_version_name ( u32 hdr )

gets the version name of an MPEG-1/2/3 audio frame

Parameters

hdr	the frame header

Returns: the version name

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◆ gf_vorbis_parse_header()

Bool gf_vorbis_parse_header	(	GF_VorbisParser *	vp,
		u8 *	data,
		u32	data_len
	)

parses vorbis header packets initializes the parser on success, leave it to NULL otherwise

Parameters

vp	pointer to a vorbis parser to use
data	source buffer
data_len	size of buffer

Returns: GF_TRUE if success, GF_FALSE otherwise

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◆ gf_vorbis_check_frame()

u32 gf_vorbis_check_frame	(	GF_VorbisParser *	vp,
		u8 *	data,
		u32	data_len
	)

checks vorbis frame

Parameters

vp	the vorbis parser to use
data	source buffer
data_len	size of buffer

Returns: 0 if init error or not a vorbis frame, otherwise returns the number of audio samples in this frame

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◆ gf_opus_parse_header()

Bool gf_opus_parse_header	(	GF_OpusConfig *	ocfg,
		u8 *	data,
		u32	data_len
	)

parses opus header packets - initializes the config on success, leave it to NULL otherwise

Parameters

cfg	pointer to a opus config to fill
data	opus header buffer to parse
data_len	size of opus header buffer

Returns: 1 if success, 0 if error

defined(GPAC_DISABLE_AV_PARSERS) && !defined (GPAC_DISABLE_OGG)

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◆ gf_opus_check_frame()

u32 gf_opus_check_frame	(	GF_OpusConfig *	cfg,
		u8 *	data,
		u32	data_len
	)

checks if an opus frame is valid

Parameters

cfg	pointer to a opus config to use
data	source buffer
data_len	size of buffer

Returns: 0 if init error or not a vorbis frame, otherwise returns the number of audio samples in this frame

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◆ gf_mpegh_escaped_value()

u64 gf_mpegh_escaped_value	(	GF_BitStream *	bs,
		u32	nBits1,
		u32	nBits2,
		u32	nBits3
	)

defined(GPAC_DISABLE_AV_PARSERS) && !defined (GPAC_DISABLE_OGG)

reads escaped value according to usac/mpegh

Parameters

bs	bitstream object
nBits1	first number of bits
nBits2	second number of bits
nBits3	third number set of bits

Returns: value read

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◆ gf_mpegh_get_mhas_pl()

s32 gf_mpegh_get_mhas_pl	(	u8 *	ptr,
		u32	size,
		u64 *	chan_layout
	)

parse profile and level from a MHAS payload

Parameters

ptr	the MHAS payload
size	size of the MHAS payload
chan_layout	set to the channel layout if found, 0 otherwise - optional, may be NULL

Returns: the MHAS profile found, or -1 of not found

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◆ gf_id3_read_size()

u32 gf_id3_read_size ( GF_BitStream * bs )

reads a 32 bit sync safe integer of id3v2 from a bitstream object

Parameters

bs	the bitstream object to use - has to be positioned on the start if an id3v2 size field

Returns: the id3v2 size field read

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◆ gf_m4a_get_channel_cfg()

u32 gf_m4a_get_channel_cfg ( u32 nb_chan )

returns channel config value (as written in AAC DSI) for the given number of channels

Parameters

nb_chan the number of channels

Returns: the MPEG-4 AAC channel config value

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◆ gf_m4a_get_config()

GF_Err gf_m4a_get_config	(	u8 *	dsi,
		u32	dsi_size,
		GF_M4ADecSpecInfo *	cfg
	)

parses MPEG-4 audio dsi

Parameters

dsi	the buffer containing the decoder config
dsi_size	size of the buffer containing the decoder config
cfg	will be filled with the parsed value

Returns: error code if any

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◆ gf_m4a_get_profile()

u32 gf_m4a_get_profile ( GF_M4ADecSpecInfo * cfg )

gets audio profile and level for a given configuration

Parameters

cfg	the parsed MPEG-4 audio configuration

Returns: audio PL

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◆ gf_m4a_write_config()

GF_Err gf_m4a_write_config	(	GF_M4ADecSpecInfo *	cfg,
		u8 **	dsi,
		u32 *	dsi_size
	)

writes MPEG-4 audio dsi in a byte buffer - backward-compatible signaling extensions are not written

Parameters

cfg	the configuration to write
dsi	set to the encoded buffer (to be freed by caller)
dsi_size	set to the size of the encoded buffer

Returns: error code if any

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◆ gf_m4a_write_config_bs()

GF_Err gf_m4a_write_config_bs	(	GF_BitStream *	bs,
		GF_M4ADecSpecInfo *	cfg
	)

writes MPEG-4 audio dsi in a bitstream object - backward-compatible signaling extensions are not written

Parameters

bs	the bitstream object to write to
cfg	the configuration to write

Returns: error code if any

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◆ gf_m4a_parse_config()

GF_Err gf_m4a_parse_config	(	GF_BitStream *	bs,
		GF_M4ADecSpecInfo *	cfg,
		Bool	size_known
	)

parses MPEG-4 audio dsi from bitstream

Parameters

bs	the bitstream object to use (shall start in the beginning of the dsi)
cfg	will be filled with the parsed value
size_known	set to GF_TRUE if the bitstream contains the complete DSI (and only it), to parse backward-compatible extensions

Returns: error code if any

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◆ gf_m4a_parse_program_config_element()

GF_Err gf_m4a_parse_program_config_element	(	GF_BitStream *	bs,
		GF_M4ADecSpecInfo *	cfg
	)

reads program config element of MPEG-4 audio dsi

Parameters

bs	the bitstream object to use (shall start in the beginning of the dsi)
cfg	the config to fill

Returns: error code if any

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◆ gf_m4a_write_program_config_element_bs()

GF_Err gf_m4a_write_program_config_element_bs	(	GF_BitStream *	bs,
		GF_M4ADecSpecInfo *	cfg
	)

writes program config element of MPEG-4 audio dsi

Parameters

bs	the bitstream object to use (shall start in the beginning of the dsi)
cfg	the config to write

Returns: error code if any

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◆ gf_m4a_object_type_name()

const char* gf_m4a_object_type_name ( u32 objectType )

gets the name of a given MPEG-4 audio object type

Parameters

objectType the object type

Returns: the MPEG-4 audio object type name

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◆ gf_m4a_get_profile_name()

const char* gf_m4a_get_profile_name ( u8 audio_pl )

gets the name of the the given MPEG-4 audio profile

Parameters

audio_pl the profile/level

Returns: the MPEG-4 audio profile name

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◆ gf_ac3_parser()

Bool gf_ac3_parser	(	u8 *	buffer,
		u32	buffer_size,
		u32 *	pos,
		GF_AC3Config *	out_hdr,
		Bool	full_parse
	)

parses an AC-3 header from a buffer

Parameters

buffer	buffer to parse
buffer_size	size of buffer to parse
pos	set to start offset (in bytes) of the AC3 header parsed
out_hdr	will be filled by parser
full_parse	if GF_TRUE, complete parsing of the header will be done

Returns: GF_TRUE if success

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◆ gf_ac3_parser_bs()

Bool gf_ac3_parser_bs	(	GF_BitStream *	bs,
		GF_AC3Config *	hdr,
		Bool	full_parse
	)

parses an AC-3 header from a bitstream

Parameters

bs	bitstream to parse
hdr	will be filled by parser
full_parse	if GF_TRUE, complete parsing of the header will be done

Returns: GF_TRUE if success

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◆ gf_eac3_parser()

Bool gf_eac3_parser	(	u8 *	buffer,
		u32	buffer_size,
		u32 *	pos,
		GF_AC3Config *	hdr,
		Bool	full_parse
	)

parses an EAC-3 header from a buffer and checks for next frame/blocks presence

Parameters

buffer	buffer to parse
buffer_size	size of buffer to parse
pos	set to start offset (in bytes) of the AC3 header parsed
hdr	will be filled by parser
full_parse	if GF_TRUE, complete parsing of the header and check for next frame/blocks presence will be done

Returns: GF_TRUE if success

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◆ gf_eac3_parser_bs()

Bool gf_eac3_parser_bs	(	GF_BitStream *	bs,
		GF_AC3Config *	hdr,
		Bool	full_parse
	)

parses an EAC-3 header from a bitstream

Parameters

bs	bitstream to parse
hdr	will be filled by parser
full_parse	if GF_TRUE, complete parsing of the header and check for next frame/blocks presence will be done

Returns: GF_TRUE if success

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◆ gf_eac3_get_chan_loc_count()

u32 gf_eac3_get_chan_loc_count ( u32 chan_loc )

gets the number of channels from chan_loc info of EAC3 config

Parameters

chan_loc acmod of the associated frame header

Returns: number of channels

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◆ gf_ac3_get_channel_layout()

u64 gf_ac3_get_channel_layout ( GF_AC3Config * ac3 )

gets the channel layout mask from EAC3 config

Parameters

ac3	the decoded AC3 configuration

Returns: channel mask

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◆ gf_ac3_get_total_channels()

u32 gf_ac3_get_total_channels ( u32 acmod )

gets the total number of channels in an AC3 frame, including surround but not lfe

Parameters

acmod acmod of the associated frame header

Returns: number of channels

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◆ gf_ac3_get_surround_channels()

u32 gf_ac3_get_surround_channels ( u32 acmod )

gets the number of surround channels in an AC3 frame

Parameters

acmod acmod of the associated frame header

Returns: number of surround channels

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◆ gf_ac3_get_bitrate()

u32 gf_ac3_get_bitrate ( u32 brcode )

gets the bitrate of an AC3 frame

Parameters

brcode brcode of the associated frame header

Returns: bitrate in bps

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◆ gf_avc_get_sps_info()

GF_Err gf_avc_get_sps_info	(	u8 *	sps,
		u32	sps_size,
		u32 *	sps_id,
		u32 *	width,
		u32 *	height,
		s32 *	par_n,
		s32 *	par_d
	)

gets basic information from an AVC Sequence Parameter Set

Parameters

sps	SPS NAL buffer
sps_size	size of buffer
sps_id	set to the ID
width	set to the width
height	set to the height
par_n	set to the pixel aspect ratio numerator
par_d	set to the pixel aspect ratio denominator

Returns: error code if any

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◆ gf_avc_get_pps_info()

GF_Err gf_avc_get_pps_info	(	u8 *	pps,
		u32	pps_size,
		u32 *	pps_id,
		u32 *	sps_id
	)

gets basic information from an AVC Picture Parameter Set

Parameters

pps	PPS NAL buffer
pps_size	size of buffer
pps_id	set to the ID of the PPS
sps_id	set to the SPS ID of the PPS

Returns: error code if any

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◆ gf_hevc_get_sps_info()

GF_Err gf_hevc_get_sps_info	(	u8 *	sps_data,
		u32	sps_size,
		u32 *	sps_id,
		u32 *	width,
		u32 *	height,
		s32 *	par_n,
		s32 *	par_d
	)

gets basic information from an HEVC Sequence Parameter Set

Parameters

sps_data	SPS NAL buffer
sps_size	size of buffer
sps_id	set to the ID
width	set to the width
height	set to the height
par_n	set to the pixel aspect ratio numerator
par_d	set to the pixel aspect ratio denominator

Returns: error code if any

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◆ gf_vvc_get_sps_info()

GF_Err gf_vvc_get_sps_info	(	u8 *	sps_data,
		u32	sps_size,
		u32 *	sps_id,
		u32 *	width,
		u32 *	height,
		s32 *	par_n,
		s32 *	par_d
	)

gets basic information from a VVC Sequence Parameter Set

Parameters

sps_data	SPS NAL buffer
sps_size	size of buffer
sps_id	set to the ID
width	set to the width
height	set to the height
par_n	set to the pixel aspect ratio numerator
par_d	set to the pixel aspect ratio denominator

Returns: error code if any

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◆ gf_vvc_get_profile_name()

const char* gf_vvc_get_profile_name ( u8 video_prof )

get VVC profile name

Parameters

video_prof profile value

Returns: the profile name

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◆ gf_avc_hevc_get_chroma_format_name()

const char* gf_avc_hevc_get_chroma_format_name ( u8 chroma_format )

gets chroma format name from MPEG chroma format

Parameters

chroma_format the chroma format to query (1: 420, 2: 422, 3: 444)

Returns: the name of the format

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◆ gf_avc_get_profile_name()

const char* gf_avc_get_profile_name ( u8 profile_idc )

gets AVC profile name from profile indication

Parameters

profile_idc the PL indication

Returns: the name of the profile

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◆ gf_avcc_use_extensions()

Bool gf_avcc_use_extensions ( u8 profile_idc )

checks if avcc extensions are used for this profile

Parameters

profile_idc the PL indication

Returns: GF_TRUE if extensions must be written in avcc for the given profile

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◆ gf_hevc_get_profile_name()

const char* gf_hevc_get_profile_name ( u8 profile_idc )

gets HEVC profile name from profile indication

Parameters

profile_idc the PL indication

Returns: the name of the profile

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◆ gf_img_parse()

void gf_img_parse	(	GF_BitStream *	bs,
		u32 *	codecid,
		u32 *	width,
		u32 *	height,
		u8 **	dsi,
		u32 *	dsi_len
	)

parses an image from a bitstream oject. The bitstream must contain the whole image. If a thumbnail is included in the image, the indicated resolution is the one of the main image.

Parameters

bs	the source bitstream
codecid	set to the codec ID of the image
width	set to the width of the image
height	set to the height of the image
dsi	set to a buffer containing the decoder config of the image if any (in whihc case this buffer shall be freed by the caller)
dsi_len	set to the allocated buffer size

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◆ gf_img_jpeg_dec()

GF_Err gf_img_jpeg_dec	(	u8 *	jpg,
		u32	jpg_size,
		u32 *	width,
		u32 *	height,
		u32 *	pixel_format,
		u8 *	dst,
		u32 *	dst_size,
		u32	dst_nb_comp
	)

decodes a JPEG image in a preallocated buffer

Parameters

jpg	the JPEG buffer
jpg_size	size of the JPEG buffer
width	set to width of the image
height	set to height of the image
pixel_format	set to pixel format of the image
dst	buffer to hold the decoded pixels (may be NULL)
dst_size	size in bytes of the buffer to hold the decoded pixels (may be 0)
dst_nb_comp	number of components in destination buffer

Returns: GF_BUFFER_TOO_SMALL if destination buffer is too small or error if any

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◆ gf_img_png_dec()

GF_Err gf_img_png_dec	(	u8 *	png,
		u32	png_size,
		u32 *	width,
		u32 *	height,
		u32 *	pixel_format,
		u8 *	dst,
		u32 *	dst_size
	)

decodes a PNG image in a preallocated buffer

Parameters

png	the PNG buffer
png_size	size of the PNG buffer
width	set to width of the image
height	set to height of the image
pixel_format	set to pixel format of the image
dst	buffer to hold the decoded pixels (may be NULL)
dst_size	size in bytes of the buffer to hold the decoded pixels (may be 0)

Returns: GF_BUFFER_TOO_SMALL if destination buffer is too small or error if any

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◆ gf_img_png_enc()

GF_Err gf_img_png_enc	(	u8 *	data,
		u32	width,
		u32	height,
		s32	stride,
		u32	pixel_format,
		u8 *	dst,
		u32 *	dst_size
	)

encodes a raw image into a PNG image

Parameters

data	the pixel data
width	the pixel width
height	the pixel height
stride	the pixel horizontal stride
pixel_format	pixel format of the image
dst	buffer to hold the decoded pixels (may be NULL)
dst_size	set to the size in bytes of the buffer to hold the decoded pixels (may be 0)

Returns: GF_BUFFER_TOO_SMALL if destination buffer is too small or error if any

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◆ gf_av1_get_obu_name()

const char* gf_av1_get_obu_name ( ObuType obu_type )

gets the name of a given OBU type

Parameters

obu_type the OBU type

Returns: the OBU name

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Variable Documentation

◆ GF_M4ASampleRates

const u32 GF_M4ASampleRates[]

static

Initial value:

=
{
        96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
        16000, 12000, 11025, 8000, 7350, 0, 0, 0
}

AAC sample rates

◆ GF_M4ANumChannels

const u32 GF_M4ANumChannels[]

static

Initial value:

=
{
        1, 2, 3, 4, 5, 6, 8, 0, 0, 0, 7, 8, 0, 8, 0
}

AAC channel configurations

Data Structures

Enumerations

Functions

Variables

Detailed Description

Data Structure Documentation

◆ GF_M4VDecSpecInfo

◆ GF_VorbisParser

◆ GF_M4ADecSpecInfo

Enumeration Type Documentation

◆ anonymous enum

◆ ObuType

◆ ObuMetadataType

Function Documentation

◆ gf_media_reduce_aspect_ratio()

◆ gf_media_get_reduced_frame_rate()

◆ gf_media_nalu_add_emulation_bytes()

◆ gf_media_nalu_emulation_bytes_add_count()

◆ gf_m4v_parser_new()

◆ gf_m4v_parser_bs_new()

◆ gf_m4v_parser_del()

◆ gf_m4v_parser_del_no_bs()

◆ gf_m4v_parse_config()

◆ gf_m4v_parser_reset()

◆ gf_m4v_parse_frame()

◆ gf_m4v_get_object_start()

◆ gf_m4v_get_config()

◆ gf_mpegv12_get_config()

◆ gf_m4v_rewrite_pl()

◆ gf_m4v_rewrite_par()

◆ gf_m4v_get_profile_name()

◆ gf_mv12_next_start_code()

◆ gf_mv12_next_slice_start()

◆ gf_mp3_num_channels()

◆ gf_mp3_sampling_rate()

◆ gf_mp3_window_size()

◆ gf_mp3_bit_rate()

◆ gf_mp3_object_type_indication()

◆ gf_mp3_layer()

◆ gf_mp3_frame_size()

◆ gf_mp3_get_next_header()

◆ gf_mp3_get_next_header_mem()

◆ gf_mp3_version()

◆ gf_mp3_version_name()

◆ gf_vorbis_parse_header()

◆ gf_vorbis_check_frame()

◆ gf_opus_parse_header()

◆ gf_opus_check_frame()

◆ gf_mpegh_escaped_value()

◆ gf_mpegh_get_mhas_pl()

◆ gf_id3_read_size()

◆ gf_m4a_get_channel_cfg()

◆ gf_m4a_get_config()

◆ gf_m4a_get_profile()

◆ gf_m4a_write_config()

◆ gf_m4a_write_config_bs()

◆ gf_m4a_parse_config()

◆ gf_m4a_parse_program_config_element()

◆ gf_m4a_write_program_config_element_bs()

◆ gf_m4a_object_type_name()

◆ gf_m4a_get_profile_name()

◆ gf_ac3_parser()

◆ gf_ac3_parser_bs()

◆ gf_eac3_parser()

◆ gf_eac3_parser_bs()

◆ gf_eac3_get_chan_loc_count()

◆ gf_ac3_get_channel_layout()

◆ gf_ac3_get_total_channels()

◆ gf_ac3_get_surround_channels()

◆ gf_ac3_get_bitrate()

◆ gf_avc_get_sps_info()

◆ gf_avc_get_pps_info()

◆ gf_hevc_get_sps_info()

◆ gf_vvc_get_sps_info()

◆ gf_vvc_get_profile_name()

◆ gf_avc_hevc_get_chroma_format_name()

◆ gf_avc_get_profile_name()

◆ gf_avcc_use_extensions()

◆ gf_hevc_get_profile_name()

◆ gf_img_parse()