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gstreamer/gst-libs/gst/audio/audio-format.c
Wim Taymans 3f8c5ea036 audio: add orc enabled pack and unpack functions
2012-06-08 17:57:43 +02:00

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/* GStreamer
* Copyright (C) <2012> Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include "audio-format.h"
#include "gstaudiopack.h"
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
# define orc_unpack_s16le orc_unpack_s16
# define orc_unpack_s16be orc_unpack_s16_swap
# define orc_unpack_u16le orc_unpack_u16
# define orc_unpack_u16be orc_unpack_u16_swap
# define orc_unpack_s24_32le orc_unpack_s24_32
# define orc_unpack_s24_32be orc_unpack_s24_32_swap
# define orc_unpack_u24_32le orc_unpack_u24_32
# define orc_unpack_u24_32be orc_unpack_u24_32_swap
# define orc_unpack_s32le orc_unpack_s32
# define orc_unpack_s32be orc_unpack_s32_swap
# define orc_unpack_u32le orc_unpack_u32
# define orc_unpack_u32be orc_unpack_u32_swap
# define orc_unpack_f32le orc_unpack_f32
# define orc_unpack_f32be orc_unpack_f32_swap
# define orc_unpack_f64le orc_unpack_f64
# define orc_unpack_f64be orc_unpack_f64_swap
# define orc_pack_s16le orc_pack_s16
# define orc_pack_s16be orc_pack_s16_swap
# define orc_pack_u16le orc_pack_u16
# define orc_pack_u16be orc_pack_u16_swap
# define orc_pack_s24_32le orc_pack_s24_32
# define orc_pack_s24_32be orc_pack_s24_32_swap
# define orc_pack_u24_32le orc_pack_u24_32
# define orc_pack_u24_32be orc_pack_u24_32_swap
# define orc_pack_s32le orc_pack_s32
# define orc_pack_s32be orc_pack_s32_swap
# define orc_pack_u32le orc_pack_u32
# define orc_pack_u32be orc_pack_u32_swap
# define orc_pack_f32le orc_pack_f32
# define orc_pack_f32be orc_pack_f32_swap
# define orc_pack_f64le orc_pack_f64
# define orc_pack_f64be orc_pack_f64_swap
#else
# define orc_unpack_s16le orc_unpack_s16_swap
# define orc_unpack_s16be orc_unpack_s16
# define orc_unpack_u16le orc_unpack_u16_swap
# define orc_unpack_u16be orc_unpack_u16
# define orc_unpack_s24_32le orc_unpack_s24_32_swap
# define orc_unpack_s24_32be orc_unpack_s24_32
# define orc_unpack_u24_32le orc_unpack_u24_32_swap
# define orc_unpack_u24_32be orc_unpack_u24_32
# define orc_unpack_s32le orc_unpack_s32_swap
# define orc_unpack_s32be orc_unpack_s32
# define orc_unpack_u32le orc_unpack_u32_swap
# define orc_unpack_u32be orc_unpack_u32
# define orc_unpack_f32le orc_unpack_f32_swap
# define orc_unpack_f32be orc_unpack_f32
# define orc_unpack_f64le orc_unpack_f64_swap
# define orc_unpack_f64be orc_unpack_f64
# define orc_pack_s16le orc_pack_s16_swap
# define orc_pack_s16be orc_pack_s16
# define orc_pack_u16le orc_pack_u16_swap
# define orc_pack_u16be orc_pack_u16
# define orc_pack_s24_32le orc_pack_s24_32_swap
# define orc_pack_s24_32be orc_pack_s24_32
# define orc_pack_u24_32le orc_pack_u24_32_swap
# define orc_pack_u24_32be orc_pack_u24_32
# define orc_pack_s32le orc_pack_s32_swap
# define orc_pack_s32be orc_pack_s32
# define orc_pack_u32le orc_pack_u32_swap
# define orc_pack_u32be orc_pack_u32
# define orc_pack_f32le orc_pack_f32_swap
# define orc_pack_f32be orc_pack_f32
# define orc_pack_f64le orc_pack_f64_swap
# define orc_pack_f64be orc_pack_f64
#endif
#define MAKE_ORC_PACK_UNPACK(fmt) \
static void unpack_ ##fmt (const GstAudioFormatInfo *info, \
GstAudioPackFlags flags, gpointer dest, \
const gpointer data, gint length) { \
orc_unpack_ ##fmt (dest, data, length); \
} \
static void pack_ ##fmt (const GstAudioFormatInfo *info, \
GstAudioPackFlags flags, const gpointer src, \
gpointer data, gint length) { \
orc_pack_ ##fmt (data, src, length); \
}
#define PACK_S8 GST_AUDIO_FORMAT_S32, unpack_s8, pack_s8
MAKE_ORC_PACK_UNPACK (s8)
#define PACK_U8 GST_AUDIO_FORMAT_S32, unpack_u8, pack_u8
MAKE_ORC_PACK_UNPACK (u8)
#define PACK_S16LE GST_AUDIO_FORMAT_S32, unpack_s16le, pack_s16le
MAKE_ORC_PACK_UNPACK (s16le)
#define PACK_S16BE GST_AUDIO_FORMAT_S32, unpack_s16be, pack_s16be
MAKE_ORC_PACK_UNPACK (s16be)
#define PACK_U16LE GST_AUDIO_FORMAT_S32, unpack_u16le, pack_u16le
MAKE_ORC_PACK_UNPACK (u16le)
#define PACK_U16BE GST_AUDIO_FORMAT_S32, unpack_u16be, pack_u16be
MAKE_ORC_PACK_UNPACK (u16be)
#define PACK_S24_32LE GST_AUDIO_FORMAT_S32, unpack_s24_32le, pack_s24_32le
MAKE_ORC_PACK_UNPACK (s24_32le)
#define PACK_S24_32BE GST_AUDIO_FORMAT_S32, unpack_s24_32be, pack_s24_32be
MAKE_ORC_PACK_UNPACK (s24_32be)
#define PACK_U24_32LE GST_AUDIO_FORMAT_S32, unpack_u24_32le, pack_u24_32le
MAKE_ORC_PACK_UNPACK (u24_32le)
#define PACK_U24_32BE GST_AUDIO_FORMAT_S32, unpack_u24_32be, pack_u24_32be
MAKE_ORC_PACK_UNPACK (u24_32be)
#define PACK_S32LE GST_AUDIO_FORMAT_S32, unpack_s32le, pack_s32le
MAKE_ORC_PACK_UNPACK (s32le)
#define PACK_S32BE GST_AUDIO_FORMAT_S32, unpack_s32be, pack_s32be
MAKE_ORC_PACK_UNPACK (s32be)
#define PACK_U32LE GST_AUDIO_FORMAT_S32, unpack_u32le, pack_u32le
MAKE_ORC_PACK_UNPACK (u32le)
#define PACK_U32BE GST_AUDIO_FORMAT_S32, unpack_u32be, pack_u32be
MAKE_ORC_PACK_UNPACK (u32be)
#define SIGNED (1U<<31)
/* pack from signed integer 32 to integer */
#define WRITE24_TO_LE(p,v) p[0] = v & 0xff; p[1] = (v >> 8) & 0xff; p[2] = (v >> 16) & 0xff
#define WRITE24_TO_BE(p,v) p[2] = v & 0xff; p[1] = (v >> 8) & 0xff; p[0] = (v >> 16) & 0xff
#define READ24_FROM_LE(p) (p[0] | (p[1] << 8) | (p[2] << 16))
#define READ24_FROM_BE(p) (p[2] | (p[1] << 8) | (p[0] << 16))
#define MAKE_PACK_UNPACK(name, stride, sign, scale, READ_FUNC, WRITE_FUNC) \
static void unpack_ ##name (const GstAudioFormatInfo *info, \
GstAudioPackFlags flags, gpointer dest, \
const gpointer data, gint length) \
{ \
guint32 *d = dest; \
guint8 *s = data; \
for (;length; length--) { \
*d++ = (((gint32) READ_FUNC (s)) << scale) ^ (sign); \
s += stride; \
} \
} \
static void pack_ ##name (const GstAudioFormatInfo *info, \
GstAudioPackFlags flags, const gpointer src, \
gpointer data, gint length) \
{ \
gint32 tmp; \
guint32 *s = src; \
guint8 *d = data; \
for (;length; length--) { \
tmp = (*s++ ^ (sign)) >> scale; \
WRITE_FUNC (d, tmp); \
d += stride; \
} \
}
#define PACK_S24LE GST_AUDIO_FORMAT_S32, unpack_s24le, pack_s24le
MAKE_PACK_UNPACK (s24le, 3, 0, 8, READ24_FROM_LE, WRITE24_TO_LE)
#define PACK_U24LE GST_AUDIO_FORMAT_S32, unpack_u24le, pack_u24le
MAKE_PACK_UNPACK (u24le, 3, SIGNED, 8, READ24_FROM_LE, WRITE24_TO_LE)
#define PACK_S24BE GST_AUDIO_FORMAT_S32, unpack_s24be, pack_s24be
MAKE_PACK_UNPACK (s24be, 3, 0, 8, READ24_FROM_BE, WRITE24_TO_BE)
#define PACK_U24BE GST_AUDIO_FORMAT_S32, unpack_u24be, pack_u24be
MAKE_PACK_UNPACK (u24be, 3, SIGNED, 8, READ24_FROM_BE, WRITE24_TO_BE)
#define PACK_S20LE GST_AUDIO_FORMAT_S32, unpack_s20le, pack_s20le
MAKE_PACK_UNPACK (s20le, 3, 0, 12, READ24_FROM_LE, WRITE24_TO_LE)
#define PACK_U20LE GST_AUDIO_FORMAT_S32, unpack_u20le, pack_u20le
MAKE_PACK_UNPACK (u20le, 3, SIGNED, 12, READ24_FROM_LE, WRITE24_TO_LE)
#define PACK_S20BE GST_AUDIO_FORMAT_S32, unpack_s20be, pack_s20be
MAKE_PACK_UNPACK (s20be, 3, 0, 12, READ24_FROM_BE, WRITE24_TO_BE)
#define PACK_U20BE GST_AUDIO_FORMAT_S32, unpack_u20be, pack_u20be
MAKE_PACK_UNPACK (u20be, 3, SIGNED, 12, READ24_FROM_BE, WRITE24_TO_BE)
#define PACK_S18LE GST_AUDIO_FORMAT_S32, unpack_s18le, pack_s18le
MAKE_PACK_UNPACK (s18le, 3, 0, 12, READ24_FROM_LE, WRITE24_TO_LE)
#define PACK_U18LE GST_AUDIO_FORMAT_S32, unpack_u18le, pack_u18le
MAKE_PACK_UNPACK (u18le, 3, SIGNED, 12, READ24_FROM_LE, WRITE24_TO_LE)
#define PACK_S18BE GST_AUDIO_FORMAT_S32, unpack_s18be, pack_s18be
MAKE_PACK_UNPACK (s18be, 3, 0, 12, READ24_FROM_BE, WRITE24_TO_BE)
#define PACK_U18BE GST_AUDIO_FORMAT_S32, unpack_u18be, pack_u18be
MAKE_PACK_UNPACK (u18be, 3, SIGNED, 12, READ24_FROM_BE, WRITE24_TO_BE)
#define PACK_F32LE GST_AUDIO_FORMAT_F64, unpack_f32le, pack_f32le
MAKE_ORC_PACK_UNPACK (f32le)
#define PACK_F32BE GST_AUDIO_FORMAT_F64, unpack_f32be, pack_f32be
MAKE_ORC_PACK_UNPACK (f32be)
#define PACK_F64LE GST_AUDIO_FORMAT_F64, unpack_f64le, pack_f64le
MAKE_ORC_PACK_UNPACK (f64le)
#define PACK_F64BE GST_AUDIO_FORMAT_F64, unpack_f64be, pack_f64be
MAKE_ORC_PACK_UNPACK (f64be)
#define SINT (GST_AUDIO_FORMAT_FLAG_INTEGER | GST_AUDIO_FORMAT_FLAG_SIGNED)
#define SINT_PACK (SINT | GST_AUDIO_FORMAT_FLAG_UNPACK)
#define UINT (GST_AUDIO_FORMAT_FLAG_INTEGER)
#define FLOAT (GST_AUDIO_FORMAT_FLAG_FLOAT)
#define FLOAT_PACK (FLOAT | GST_AUDIO_FORMAT_FLAG_UNPACK)
#define MAKE_FORMAT(str,desc,flags,end,width,depth,silent, pack) \
{ GST_AUDIO_FORMAT_ ##str, G_STRINGIFY(str), desc, flags, end, width, depth, silent, pack }
#define SILENT_0 { 0, 0, 0, 0, 0, 0, 0, 0 }
#define SILENT_U8 { 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80 }
#define SILENT_U16LE { 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80 }
#define SILENT_U16BE { 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00 }
#define SILENT_U24_32LE { 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x80, 0x00 }
#define SILENT_U24_32BE { 0x00, 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00 }
#define SILENT_U32LE { 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x80 }
#define SILENT_U32BE { 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00 }
#define SILENT_U24LE { 0x00, 0x00, 0x80, 0x00, 0x00, 0x80 }
#define SILENT_U24BE { 0x80, 0x00, 0x00, 0x80, 0x00, 0x00 }
#define SILENT_U20LE { 0x00, 0x00, 0x08, 0x00, 0x00, 0x08 }
#define SILENT_U20BE { 0x08, 0x00, 0x00, 0x08, 0x00, 0x00 }
#define SILENT_U18LE { 0x00, 0x00, 0x02, 0x00, 0x00, 0x02 }
#define SILENT_U18BE { 0x02, 0x00, 0x00, 0x02, 0x00, 0x00 }
static GstAudioFormatInfo formats[] = {
{GST_AUDIO_FORMAT_UNKNOWN, "UNKNOWN", "Unknown audio", 0, 0, 0, 0},
{GST_AUDIO_FORMAT_ENCODED, "ENCODED", "Encoded audio",
GST_AUDIO_FORMAT_FLAG_COMPLEX, 0, 0, 0},
/* 8 bit */
MAKE_FORMAT (S8, "8-bit signed PCM audio", SINT, 0, 8, 8, SILENT_0,
PACK_S8),
MAKE_FORMAT (U8, "8-bit unsigned PCM audio", UINT, 0, 8, 8, SILENT_U8,
PACK_U8),
/* 16 bit */
MAKE_FORMAT (S16LE, "16-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 16,
16,
SILENT_0, PACK_S16LE),
MAKE_FORMAT (S16BE, "16-bit signed PCM audio", SINT, G_BIG_ENDIAN, 16,
16,
SILENT_0, PACK_S16BE),
MAKE_FORMAT (U16LE, "16-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN,
16,
16, SILENT_U16LE, PACK_U16LE),
MAKE_FORMAT (U16BE, "16-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 16,
16,
SILENT_U16BE, PACK_U16BE),
/* 24 bit in low 3 bytes of 32 bits */
MAKE_FORMAT (S24_32LE, "24-bit signed PCM audio", SINT, G_LITTLE_ENDIAN,
32,
24, SILENT_0, PACK_S24_32LE),
MAKE_FORMAT (S24_32BE, "24-bit signed PCM audio", SINT, G_BIG_ENDIAN, 32,
24,
SILENT_0, PACK_S24_32BE),
MAKE_FORMAT (U24_32LE, "24-bit unsigned PCM audio", UINT,
G_LITTLE_ENDIAN, 32,
24, SILENT_U24_32LE, PACK_U24_32LE),
MAKE_FORMAT (U24_32BE, "24-bit unsigned PCM audio", UINT, G_BIG_ENDIAN,
32,
24, SILENT_U24_32BE, PACK_U24_32BE),
/* 32 bit */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
MAKE_FORMAT (S32LE, "32-bit signed PCM audio", SINT_PACK,
G_LITTLE_ENDIAN, 32,
32, SILENT_0, PACK_S32LE),
MAKE_FORMAT (S32BE, "32-bit signed PCM audio", SINT, G_BIG_ENDIAN, 32,
32,
SILENT_0, PACK_S32BE),
#else
MAKE_FORMAT (S32LE, "32-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 32,
32,
SILENT_0, PACK_S32LE),
MAKE_FORMAT (S32BE, "32-bit signed PCM audio", SINT_PACK, G_BIG_ENDIAN,
32,
32,
SILENT_0, PACK_S32BE),
#endif
MAKE_FORMAT (U32LE, "32-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN,
32,
32, SILENT_U32LE, PACK_U32LE),
MAKE_FORMAT (U32BE, "32-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 32,
32,
SILENT_U32BE, PACK_U32BE),
/* 24 bit in 3 bytes */
MAKE_FORMAT (S24LE, "24-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24,
24,
SILENT_0, PACK_S24LE),
MAKE_FORMAT (S24BE, "24-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24,
24,
SILENT_0, PACK_S24BE),
MAKE_FORMAT (U24LE, "24-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN,
24,
24, SILENT_U24LE, PACK_U24LE),
MAKE_FORMAT (U24BE, "24-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24,
24,
SILENT_U24BE, PACK_U24BE),
/* 20 bit in 3 bytes */
MAKE_FORMAT (S20LE, "20-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24,
20,
SILENT_0, PACK_S20LE),
MAKE_FORMAT (S20BE, "20-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24,
20,
SILENT_0, PACK_S20BE),
MAKE_FORMAT (U20LE, "20-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN,
24,
20, SILENT_U20LE, PACK_U20LE),
MAKE_FORMAT (U20BE, "20-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24,
20,
SILENT_U20BE, PACK_U20BE),
/* 18 bit in 3 bytes */
MAKE_FORMAT (S18LE, "18-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24,
18,
SILENT_0, PACK_S18LE),
MAKE_FORMAT (S18BE, "18-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24,
18,
SILENT_0, PACK_S18BE),
MAKE_FORMAT (U18LE, "18-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN,
24,
18, SILENT_U18LE, PACK_U18LE),
MAKE_FORMAT (U18BE, "18-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24,
18,
SILENT_U18BE, PACK_U18BE),
/* float */
MAKE_FORMAT (F32LE, "32-bit floating-point audio",
GST_AUDIO_FORMAT_FLAG_FLOAT, G_LITTLE_ENDIAN, 32, 32, SILENT_0,
PACK_F32LE),
MAKE_FORMAT (F32BE, "32-bit floating-point audio",
GST_AUDIO_FORMAT_FLAG_FLOAT, G_BIG_ENDIAN, 32, 32, SILENT_0,
PACK_F32BE),
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
MAKE_FORMAT (F64LE, "64-bit floating-point audio",
FLOAT_PACK, G_LITTLE_ENDIAN, 64, 64, SILENT_0, PACK_F64LE),
MAKE_FORMAT (F64BE, "64-bit floating-point audio",
FLOAT, G_BIG_ENDIAN, 64, 64, SILENT_0, PACK_F64BE)
#else
MAKE_FORMAT (F64LE, "64-bit floating-point audio",
FLOAT, G_LITTLE_ENDIAN, 64, 64, SILENT_0, PACK_F64LE),
MAKE_FORMAT (F64BE, "64-bit floating-point audio",
FLOAT_PACK, G_BIG_ENDIAN, 64, 64, SILENT_0, PACK_F64BE)
#endif
};
G_DEFINE_POINTER_TYPE (GstAudioFormatInfo, gst_audio_format_info);
/**
* gst_audio_format_build_integer:
* @sign: signed or unsigned format
* @endianness: G_LITTLE_ENDIAN or G_BIG_ENDIAN
* @width: amount of bits used per sample
* @depth: amount of used bits in @width
*
* Construct a #GstAudioFormat with given parameters.
*
* Returns: a #GstAudioFormat or GST_AUDIO_FORMAT_UNKNOWN when no audio format
* exists with the given parameters.
*/
GstAudioFormat
gst_audio_format_build_integer (gboolean sign, gint endianness,
gint width, gint depth)
{
gint i, e;
for (i = 0; i < G_N_ELEMENTS (formats); i++) {
GstAudioFormatInfo *finfo = &formats[i];
/* must be int */
if (!GST_AUDIO_FORMAT_INFO_IS_INTEGER (finfo))
continue;
/* width and depth must match */
if (width != GST_AUDIO_FORMAT_INFO_WIDTH (finfo))
continue;
if (depth != GST_AUDIO_FORMAT_INFO_DEPTH (finfo))
continue;
/* if there is endianness, it must match */
e = GST_AUDIO_FORMAT_INFO_ENDIANNESS (finfo);
if (e && e != endianness)
continue;
/* check sign */
if ((sign && !GST_AUDIO_FORMAT_INFO_IS_SIGNED (finfo)) ||
(!sign && GST_AUDIO_FORMAT_INFO_IS_SIGNED (finfo)))
continue;
return GST_AUDIO_FORMAT_INFO_FORMAT (finfo);
}
return GST_AUDIO_FORMAT_UNKNOWN;
}
/**
* gst_audio_format_from_string:
* @format: a format string
*
* Convert the @format string to its #GstAudioFormat.
*
* Returns: the #GstAudioFormat for @format or GST_AUDIO_FORMAT_UNKNOWN when the
* string is not a known format.
*/
GstAudioFormat
gst_audio_format_from_string (const gchar * format)
{
guint i;
for (i = 0; i < G_N_ELEMENTS (formats); i++) {
if (strcmp (GST_AUDIO_FORMAT_INFO_NAME (&formats[i]), format) == 0)
return GST_AUDIO_FORMAT_INFO_FORMAT (&formats[i]);
}
return GST_AUDIO_FORMAT_UNKNOWN;
}
const gchar *
gst_audio_format_to_string (GstAudioFormat format)
{
g_return_val_if_fail (format != GST_AUDIO_FORMAT_UNKNOWN, NULL);
if (format >= G_N_ELEMENTS (formats))
return NULL;
return GST_AUDIO_FORMAT_INFO_NAME (&formats[format]);
}
/**
* gst_audio_format_get_info:
* @format: a #GstAudioFormat
*
* Get the #GstAudioFormatInfo for @format
*
* Returns: The #GstAudioFormatInfo for @format.
*/
const GstAudioFormatInfo *
gst_audio_format_get_info (GstAudioFormat format)
{
g_return_val_if_fail (format < G_N_ELEMENTS (formats), NULL);
return &formats[format];
}
/**
* gst_audio_format_fill_silence:
* @info: a #GstAudioFormatInfo
* @dest: a destination to fill
* @length: the length to fill
*
* Fill @length bytes in @dest with silence samples for @info.
*/
void
gst_audio_format_fill_silence (const GstAudioFormatInfo * info,
gpointer dest, gsize length)
{
guint8 *dptr = dest;
g_return_if_fail (info != NULL);
g_return_if_fail (dest != NULL);
if (info->flags & GST_AUDIO_FORMAT_FLAG_FLOAT ||
info->flags & GST_AUDIO_FORMAT_FLAG_SIGNED) {
/* float or signed always 0 */
memset (dest, 0, length);
} else {
gint i, j, bps = info->width >> 3;
switch (bps) {
case 1:
memset (dest, info->silence[0], length);
break;
default:
for (i = 0; i < length; i += bps) {
for (j = 0; j < bps; j++)
*dptr++ = info->silence[j];
}
break;
}
}
}
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