common.c File Reference

Include dependency graph for common.c:

Macros
#define	REORDER_TYPE(type)
#define	INTERLEAVE_TYPE(type)
#define	DEINTERLEAVE_TYPE(type)

Functions
unsigned int	aout_BitsPerSample (vlc_fourcc_t i_format)
void	aout_FormatPrepare (audio_sample_format_t *p_format)
const char *	aout_FormatPrintChannels (const audio_sample_format_t *p_format)
void	aout_FormatPrint (vlc_object_t *obj, const char *psz_text, const audio_sample_format_t *p_format)
	Prints an audio sample format in a human-readable form.
void	aout_FormatsPrint (vlc_object_t *obj, const char *psz_text, const audio_sample_format_t *p_format1, const audio_sample_format_t *p_format2)
	Prints two formats in a human-readable form.
unsigned	aout_CheckChannelReorder (const uint32_t *chans_in, const uint32_t *chans_out, uint32_t mask, uint8_t *restrict table)
void	aout_ChannelReorder (void *ptr, size_t bytes, uint8_t channels, const uint8_t *restrict chans_table, vlc_fourcc_t fourcc)
void	aout_Interleave (void *restrict dst, const void *const *srcv, unsigned samples, unsigned chans, vlc_fourcc_t fourcc)
	Interleaves audio samples within a block of samples.
void	aout_Deinterleave (void *restrict dst, const void *restrict src, unsigned samples, unsigned chans, vlc_fourcc_t fourcc)
	Deinterleaves audio samples within a block of samples.
static void	ExtractChannel (uint8_t *pi_dst, int i_dst_channels, const uint8_t *pi_src, int i_src_channels, int i_sample_count, const int *pi_selection, int i_bytes)
void	aout_ChannelExtract (void *p_dst, int i_dst_channels, const void *p_src, int i_src_channels, int i_sample_count, const int *pi_selection, int i_bits_per_sample)
	Do the actual channels extraction using the parameters created by aout_CheckChannelExtraction.
bool	aout_CheckChannelExtraction (int *pi_selection, uint32_t *pi_layout, int *pi_channels, const uint32_t pi_order_dst[9], const uint32_t *pi_order_src, int i_channels)
	This function will compute the extraction parameter into pi_selection to go from i_channels with their type given by pi_order_src[] into the order describe by pi_order_dst.
static int	FilterOrder (const char *psz_name)
int	aout_EnableFilter (audio_output_t *p_aout, const char *psz_name, bool b_add)
	Enable or disable an audio filter ("audio-filter")

Macro Definition Documentation

DEINTERLEAVE_TYPE

#define DEINTERLEAVE_TYPE

(

type

)

Value:

do { \
    type *d = dst; \
    const type *s = src; \
    for( size_t i = 0; i < chans; i++ ) { \
        for( size_t j = 0, k = 0; j < samples; j++, k += chans ) \
            *(d++) = s[k]; \
        s++; \
    } \
} while(0)

INTERLEAVE_TYPE

#define INTERLEAVE_TYPE

(

type

)

Value:

do { \
    type *d = dst; \
    for( size_t i = 0; i < chans; i++ ) { \
        const type *s = srcv[i]; \
        for( size_t j = 0, k = 0; j < samples; j++, k += chans ) \
            d[k] = *(s++); \
        d++; \
    } \
} while(0)

REORDER_TYPE

#define REORDER_TYPE

(

type

)

Value:

do { \
    const size_t frames = (bytes / sizeof (type)) / channels; \
    type *buf = ptr; \
\
    for( size_t i = 0; i < frames; i++ ) \
    { \
        type tmp[AOUT_CHAN_MAX]; \
\
        for( size_t j = 0; j < channels; j++ ) \
            tmp[chans_table[j]] = buf[j]; \
        memcpy( buf, tmp, sizeof (type) * channels ); \
        buf += channels; \
    } \
} while(0)

Function Documentation

aout_ChannelReorder()

void aout_ChannelReorder	(	void *	ptr,
		size_t	bytes,
		uint8_t	channels,
		const uint8_t *restrict	chans_table,
		vlc_fourcc_t	fourcc
	)

References aout_BitsPerSample(), AOUT_CHAN_MAX, likely, REORDER_TYPE, unlikely, VLC_CODEC_FL32, VLC_CODEC_FL64, VLC_CODEC_S16N, VLC_CODEC_S32N, and VLC_CODEC_U8.

aout_CheckChannelReorder()

unsigned aout_CheckChannelReorder	(	const uint32_t *	chans_in,
		const uint32_t *	chans_out,
		uint32_t	mask,
		uint8_t *restrict	table
	)

References AOUT_CHAN_MAX, and pi_vlc_chan_order_wg4.

Referenced by rtp_pcm_open().

aout_Deinterleave()

void aout_Deinterleave	(	void *restrict	dst,
		const void *restrict	src,
		unsigned	samples,
		unsigned	chans,
		vlc_fourcc_t	fourcc
	)

Deinterleaves audio samples within a block of samples.

Parameters

dst	destination buffer for planar samples
src	source buffer with interleaved samples
samples	number of samples (per channel/per plane)
chans	channels/planes count
fourcc	sample format (must be a linear sample format)

Note

The samples must be naturally aligned in memory.

Warning

Destination and source buffers MUST NOT overlap.

References DEINTERLEAVE_TYPE, vlc_assert_unreachable, VLC_CODEC_FL32, VLC_CODEC_FL64, VLC_CODEC_S16N, VLC_CODEC_S32N, and VLC_CODEC_U8.

aout_FormatsPrint()

void aout_FormatsPrint	(	vlc_object_t *	obj,
		const char *	psz_text,
		const audio_sample_format_t *	p_format1,
		const audio_sample_format_t *	p_format2
	)

Prints two formats in a human-readable form.

References aout_FormatPrintChannels(), audio_format_t::i_format, audio_format_t::i_rate, and msg_Dbg.

aout_Interleave()

void aout_Interleave	(	void *restrict	dst,
		const void *const *	srcv,
		unsigned	samples,
		unsigned	chans,
		vlc_fourcc_t	fourcc
	)

Interleaves audio samples within a block of samples.

Parameters

dst	destination buffer for interleaved samples
srcv	source buffers (one per plane) of uninterleaved samples
samples	number of samples (per channel/per plane)
chans	channels/planes count
fourcc	sample format (must be a linear sample format)

Note

The samples must be naturally aligned in memory.

Warning

Destination and source buffers MUST NOT overlap.

References INTERLEAVE_TYPE, vlc_assert_unreachable, VLC_CODEC_FL32, VLC_CODEC_FL64, VLC_CODEC_S16N, VLC_CODEC_S32N, and VLC_CODEC_U8.

ExtractChannel()

static void ExtractChannel ( uint8_t *  pi_dst, int  i_dst_channels, const uint8_t *  pi_src, int  i_src_channels, int  i_sample_count, const int *  pi_selection, int  i_bytes  )

inlinestatic

Referenced by aout_ChannelExtract().

FilterOrder()

static int FilterOrder ( const char *  psz_name )

static

References ARRAY_SIZE, and psz_name.

Referenced by aout_EnableFilter().