reframe_flac.c File Reference

#include <gpac/avparse.h>
#include <gpac/constants.h>
#include <gpac/filters.h>

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Data Structures
struct	FLACIdx
struct	FLACHeader
struct	GF_FLACDmxCtx

Macros
#define	FLAC_CHANNELS   8
#define	FLAC_MID_SIDE   3
#define	OFFS(_n)   #_n, offsetof(GF_FLACDmxCtx, _n)

Functions
GF_Err	flac_dmx_configure_pid (GF_Filter *filter, GF_FilterPid *pid, Bool is_remove)
static void	flac_dmx_check_dur (GF_Filter *filter, GF_FLACDmxCtx *ctx)
static u64	flac_channel_layout (u32 in_lay)
static void	flac_dmx_check_pid (GF_Filter *filter, GF_FLACDmxCtx *ctx, u8 *dsi, u32 dsi_size)
static Bool	flac_dmx_process_event (GF_Filter *filter, const GF_FilterEvent *evt)
static GFINLINE void	flac_dmx_update_cts (GF_FLACDmxCtx *ctx, u32 nb_samp)
u8	flac_dmx_crc8 (u8 *data, u32 len)
static u32	flac_dmx_crc16 (const u8 *data, u32 len)
static Bool	flac_parse_header (GF_FLACDmxCtx *ctx, char *data, u32 size, FLACHeader *hdr)
GF_Err	flac_dmx_process (GF_Filter *filter)
static GF_Err	flac_dmx_initialize (GF_Filter *filter)
static void	flac_dmx_finalize (GF_Filter *filter)
static const char *	flac_dmx_probe_data (const u8 *data, u32 size, GF_FilterProbeScore *score)
const GF_FilterRegister *	rfflac_register (GF_FilterSession *session)

Variables
u8 const	flac_dmx_crc8_table [256]
static const u32	flac_dmx_crc16_table [256]
static u32	flac_dmx_block_sizes []
static u32	flac_dmx_samplerates []
static const GF_FilterCapability	FLACDmxCaps []
static const GF_FilterArgs	FLACDmxArgs []
GF_FilterRegister	FLACDmxRegister

---

Data Structure Documentation

FLACIdx

struct FLACIdx

Data Fields
u64	pos
Double	duration

FLACHeader

struct FLACHeader

Data Fields
u32	block_size
u32	sample_rate
u32	channels

GF_FLACDmxCtx

struct GF_FLACDmxCtx

Collaboration diagram for GF_FLACDmxCtx:

Data Fields
Double	index
Bool	docrc
GF_FilterPid *	ipid
GF_FilterPid *	opid
GF_BitStream *	bs
u64	file_pos
u64	cts
u64	prev_cts
GF_Fraction64	duration
Double	start_range
Bool	in_seek
u32	timescale
Bool	is_playing
Bool	is_file
Bool	initial_play_done
Bool	file_loaded
Bool	in_error
Bool	initialized
u32	sample_rate
u32	nb_channels
u32	bits_per_sample
u32	block_size
u32	ch_layout
u8 *	flac_buffer
u32	flac_buffer_size
u32	flac_buffer_alloc
u32	resume_from
u64	byte_offset
GF_FilterPacket *	src_pck
Bool	recompute_cts
FLACIdx *	indexes
u32	index_alloc_size
u32	index_size
u32	bitrate
Bool	copy_props
u32	dsi_crc
Bool	is_sync

Macro Definition Documentation

FLAC_CHANNELS

#define FLAC_CHANNELS   8

FLAC_MID_SIDE

#define FLAC_MID_SIDE   3

OFFS

#define OFFS

(

_n

)

#_n, offsetof(GF_FLACDmxCtx, _n)

Function Documentation

flac_dmx_configure_pid()

GF_Err flac_dmx_configure_pid	(	GF_Filter *	filter,
		GF_FilterPid *	pid,
		Bool	is_remove
	)

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flac_dmx_check_dur()

static void flac_dmx_check_dur ( GF_Filter *  filter, GF_FLACDmxCtx *  ctx  )

static

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flac_channel_layout()

static u64 flac_channel_layout ( u32  in_lay )

static

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flac_dmx_check_pid()

static void flac_dmx_check_pid ( GF_Filter *  filter, GF_FLACDmxCtx *  ctx, u8 *  dsi, u32  dsi_size  )

static

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flac_dmx_process_event()

static Bool flac_dmx_process_event ( GF_Filter *  filter, const GF_FilterEvent *  evt  )

static

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flac_dmx_update_cts()

static GFINLINE void flac_dmx_update_cts ( GF_FLACDmxCtx *  ctx, u32  nb_samp  )

static

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flac_dmx_crc8()

u8 flac_dmx_crc8	(	u8 *	data,
		u32	len
	)

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flac_dmx_crc16()

static u32 flac_dmx_crc16 ( const u8 *  data, u32  len  )

static

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flac_parse_header()

static Bool flac_parse_header ( GF_FLACDmxCtx *  ctx, char *  data, u32  size, FLACHeader *  hdr  )

static

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flac_dmx_process()

GF_Err flac_dmx_process

(

GF_Filter *

filter

)

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flac_dmx_initialize()

static GF_Err flac_dmx_initialize ( GF_Filter *  filter )

static

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flac_dmx_finalize()

static void flac_dmx_finalize ( GF_Filter *  filter )

static

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flac_dmx_probe_data()

static const char * flac_dmx_probe_data ( const u8 *  data, u32  size, GF_FilterProbeScore *  score  )

static

rfflac_register()

const GF_FilterRegister * rfflac_register

(

GF_FilterSession *

session

)

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Variable Documentation

flac_dmx_crc8_table

u8 const flac_dmx_crc8_table[256]

flac_dmx_crc16_table

const u32 flac_dmx_crc16_table[256]

static

flac_dmx_block_sizes

u32 flac_dmx_block_sizes[]

static

Initial value:

=
{
        0, 192, 576, 1152, 2304, 4608, 0, 0, 256, 512, 1024, 2048, 4096, 8192, 16384,  32768
}

flac_dmx_samplerates

u32 flac_dmx_samplerates[]

static

Initial value:

=
{
        0, 88200, 176400, 192000, 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000
}

FLACDmxCaps

const GF_FilterCapability FLACDmxCaps[]

static

Initial value:

=
{
        CAP_UINT(GF_CAPS_INPUT, GF_PROP_PID_STREAM_TYPE, GF_STREAM_FILE),
        CAP_STRING(GF_CAPS_INPUT, GF_PROP_PID_FILE_EXT, "flac"),
        CAP_STRING(GF_CAPS_INPUT, GF_PROP_PID_MIME, "audio/flac"),
        CAP_UINT(GF_CAPS_OUTPUT, GF_PROP_PID_STREAM_TYPE, GF_STREAM_AUDIO),
        CAP_UINT(GF_CAPS_OUTPUT, GF_PROP_PID_CODECID, GF_CODECID_FLAC),
        CAP_BOOL(GF_CAPS_OUTPUT_EXCLUDED, GF_PROP_PID_UNFRAMED, GF_TRUE),
        {0},
        CAP_UINT(GF_CAPS_INPUT_OUTPUT,GF_PROP_PID_STREAM_TYPE, GF_STREAM_AUDIO),
        CAP_BOOL(GF_CAPS_INPUT,GF_PROP_PID_UNFRAMED, GF_TRUE),
        CAP_UINT(GF_CAPS_INPUT_OUTPUT,GF_PROP_PID_CODECID, GF_CODECID_FLAC),
        CAP_BOOL(GF_CAPS_OUTPUT_EXCLUDED, GF_PROP_PID_UNFRAMED, GF_TRUE),
}

FLACDmxArgs

const GF_FilterArgs FLACDmxArgs[]

static

Initial value:

=
{
        { OFFS(index), "indexing window length", GF_PROP_DOUBLE, "1.0", NULL, 0},
        { OFFS(docrc), "perform CRC check after each frame", GF_PROP_BOOL, "false", NULL, 0},
        {0}
}

FLACDmxRegister

GF_FilterRegister FLACDmxRegister

Initial value:

= {
        .name = "rfflac",
 
        GF_FS_SET_HELP("This filter parses FLAC files/data and outputs corresponding audio PID and frames.\n"
        "\n"
        "By default the reframer will only check CRC footer of frames if a change in sample rate or channel mapping is detected.\n"
        "This should accommodate for most configurations, but CRC check can be enforced using [-docrc]().\n"
        "")
        .private_size = sizeof(GF_FLACDmxCtx),
        .args = FLACDmxArgs,
        .finalize = flac_dmx_finalize,
        .initialize = flac_dmx_initialize,
        SETCAPS(FLACDmxCaps),
        .configure_pid = flac_dmx_configure_pid,
        .process = flac_dmx_process,
        .probe_data = flac_dmx_probe_data,
        .process_event = flac_dmx_process_event,
        .hint_class_type = GF_FS_CLASS_FRAMING
}