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gstreamer/gst/audioconvert/audioconvert.c
Michael Smith fc30337a99 gst/audioconvert/audioconvert.c: More correct float->int conversion. 
Original commit message from CVS:
* gst/audioconvert/audioconvert.c: (float):
More correct float->int conversion.
2006-06-02 14:19:18 +00:00

365 lines
11 KiB
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/* GStreamer
* Copyright (C) 2005 Wim Taymans <wim at fluendo dot com>
*
* audioconvert.c: Convert audio to different audio formats automatically
*
* 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 "gstchannelmix.h"
#include "audioconvert.h"
/* int to float conversion: int2float(i) = 1 / (2^31-1) * i */
#define INT2FLOAT(i) (4.6566128752457969e-10 * ((gfloat)i))
/* sign bit in the intermediate format */
#define SIGNED (1<<31)
/***
* unpack code
*/
#define MAKE_UNPACK_FUNC_NAME(name) \
audio_convert_unpack_##name
#define MAKE_UNPACK_FUNC(name, stride, sign, READ_FUNC) \
static void \
MAKE_UNPACK_FUNC_NAME (name) (gpointer src, gint32 *dst, \
gint scale, gint count) \
{ \
guint8* p = (guint8 *) src; \
for (;count; count--) { \
*dst++ = (((gint32) READ_FUNC (p)) << scale) ^ (sign); \
p+=stride; \
} \
}
/* special unpack code for float */
static void
MAKE_UNPACK_FUNC_NAME (float) (gpointer src, gint32 * dst,
gint scale, gint count)
{
gfloat *p = (gfloat *) src;
gdouble temp;
for (; count; count--) {
temp = (*p++ * 2147483647.0) + 0.5;
*dst++ = (gint32) CLAMP (temp, G_MININT32, G_MAXINT32);
}
}
#define READ8(p) GST_READ_UINT8(p)
#define READ16_FROM_LE(p) GST_READ_UINT16_LE (p)
#define READ16_FROM_BE(p) GST_READ_UINT16_BE (p)
#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 READ32_FROM_LE(p) GST_READ_UINT32_LE (p)
#define READ32_FROM_BE(p) GST_READ_UINT32_BE (p)
MAKE_UNPACK_FUNC (u8, 1, SIGNED, READ8);
MAKE_UNPACK_FUNC (s8, 1, 0, READ8);
MAKE_UNPACK_FUNC (u16_le, 2, SIGNED, READ16_FROM_LE);
MAKE_UNPACK_FUNC (s16_le, 2, 0, READ16_FROM_LE);
MAKE_UNPACK_FUNC (u16_be, 2, SIGNED, READ16_FROM_BE);
MAKE_UNPACK_FUNC (s16_be, 2, 0, READ16_FROM_BE);
MAKE_UNPACK_FUNC (u24_le, 3, SIGNED, READ24_FROM_LE);
MAKE_UNPACK_FUNC (s24_le, 3, 0, READ24_FROM_LE);
MAKE_UNPACK_FUNC (u24_be, 3, SIGNED, READ24_FROM_BE);
MAKE_UNPACK_FUNC (s24_be, 3, 0, READ24_FROM_BE);
MAKE_UNPACK_FUNC (u32_le, 4, SIGNED, READ32_FROM_LE);
MAKE_UNPACK_FUNC (s32_le, 4, 0, READ32_FROM_LE);
MAKE_UNPACK_FUNC (u32_be, 4, SIGNED, READ32_FROM_BE);
MAKE_UNPACK_FUNC (s32_be, 4, 0, READ32_FROM_BE);
/***
* packing code
*/
#define MAKE_PACK_FUNC_NAME(name) \
audio_convert_pack_##name
#define MAKE_PACK_FUNC(name, stride, sign, WRITE_FUNC) \
static void \
MAKE_PACK_FUNC_NAME (name) (gint32 *src, gpointer dst, \
gint scale, gint count) \
{ \
guint8 *p = (guint8 *)dst; \
guint32 tmp; \
for (;count; count--) { \
tmp = (*src++ ^ (sign)) >> scale; \
WRITE_FUNC (p, tmp); \
p+=stride; \
} \
}
/* special float pack function */
static void
MAKE_PACK_FUNC_NAME (float) (gint32 * src, gpointer dst, gint scale, gint count)
{
gfloat *p = (gfloat *) dst;
for (; count; count--) {
*p++ = INT2FLOAT (*src++);
}
}
#define WRITE8(p, v) GST_WRITE_UINT8 (p, v)
#define WRITE16_TO_LE(p,v) GST_WRITE_UINT16_LE (p, (guint16)(v))
#define WRITE16_TO_BE(p,v) GST_WRITE_UINT16_BE (p, (guint16)(v))
#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 WRITE32_TO_LE(p,v) GST_WRITE_UINT32_LE (p, (guint32)(v))
#define WRITE32_TO_BE(p,v) GST_WRITE_UINT32_BE (p, (guint32)(v))
MAKE_PACK_FUNC (u8, 1, SIGNED, WRITE8);
MAKE_PACK_FUNC (s8, 1, 0, WRITE8);
MAKE_PACK_FUNC (u16_le, 2, SIGNED, WRITE16_TO_LE);
MAKE_PACK_FUNC (s16_le, 2, 0, WRITE16_TO_LE);
MAKE_PACK_FUNC (u16_be, 2, SIGNED, WRITE16_TO_BE);
MAKE_PACK_FUNC (s16_be, 2, 0, WRITE16_TO_BE);
MAKE_PACK_FUNC (u24_le, 3, SIGNED, WRITE24_TO_LE);
MAKE_PACK_FUNC (s24_le, 3, 0, WRITE24_TO_LE);
MAKE_PACK_FUNC (u24_be, 3, SIGNED, WRITE24_TO_BE);
MAKE_PACK_FUNC (s24_be, 3, 0, WRITE24_TO_BE);
MAKE_PACK_FUNC (u32_le, 4, SIGNED, WRITE32_TO_LE);
MAKE_PACK_FUNC (s32_le, 4, 0, WRITE32_TO_LE);
MAKE_PACK_FUNC (u32_be, 4, SIGNED, WRITE32_TO_BE);
MAKE_PACK_FUNC (s32_be, 4, 0, WRITE32_TO_BE);
static AudioConvertUnpack unpack_funcs[] = {
MAKE_UNPACK_FUNC_NAME (u8),
MAKE_UNPACK_FUNC_NAME (s8),
MAKE_UNPACK_FUNC_NAME (u8),
MAKE_UNPACK_FUNC_NAME (s8),
MAKE_UNPACK_FUNC_NAME (u16_le),
MAKE_UNPACK_FUNC_NAME (s16_le),
MAKE_UNPACK_FUNC_NAME (u16_be),
MAKE_UNPACK_FUNC_NAME (s16_be),
MAKE_UNPACK_FUNC_NAME (u24_le),
MAKE_UNPACK_FUNC_NAME (s24_le),
MAKE_UNPACK_FUNC_NAME (u24_be),
MAKE_UNPACK_FUNC_NAME (s24_be),
MAKE_UNPACK_FUNC_NAME (u32_le),
MAKE_UNPACK_FUNC_NAME (s32_le),
MAKE_UNPACK_FUNC_NAME (u32_be),
MAKE_UNPACK_FUNC_NAME (s32_be),
MAKE_UNPACK_FUNC_NAME (float),
};
static AudioConvertPack pack_funcs[] = {
MAKE_PACK_FUNC_NAME (u8),
MAKE_PACK_FUNC_NAME (s8),
MAKE_PACK_FUNC_NAME (u8),
MAKE_PACK_FUNC_NAME (s8),
MAKE_PACK_FUNC_NAME (u16_le),
MAKE_PACK_FUNC_NAME (s16_le),
MAKE_PACK_FUNC_NAME (u16_be),
MAKE_PACK_FUNC_NAME (s16_be),
MAKE_PACK_FUNC_NAME (u24_le),
MAKE_PACK_FUNC_NAME (s24_le),
MAKE_PACK_FUNC_NAME (u24_be),
MAKE_PACK_FUNC_NAME (s24_be),
MAKE_PACK_FUNC_NAME (u32_le),
MAKE_PACK_FUNC_NAME (s32_le),
MAKE_PACK_FUNC_NAME (u32_be),
MAKE_PACK_FUNC_NAME (s32_be),
MAKE_PACK_FUNC_NAME (float),
};
static gint
audio_convert_get_func_index (AudioConvertFmt * fmt)
{
gint index = 0;
if (fmt->is_int) {
index += (fmt->width / 8 - 1) * 4;
index += fmt->endianness == G_LITTLE_ENDIAN ? 0 : 2;
index += fmt->sign ? 1 : 0;
} else {
index = 16;
}
return index;
}
static gboolean
check_default (AudioConvertFmt * fmt)
{
return (fmt->width == 32 && fmt->depth == 32 &&
fmt->endianness == G_BYTE_ORDER && fmt->sign == TRUE);
}
gboolean
audio_convert_clean_fmt (AudioConvertFmt * fmt)
{
g_return_val_if_fail (fmt != NULL, FALSE);
g_free (fmt->pos);
fmt->pos = NULL;
return TRUE;
}
gboolean
audio_convert_prepare_context (AudioConvertCtx * ctx, AudioConvertFmt * in,
AudioConvertFmt * out)
{
gint idx;
g_return_val_if_fail (ctx != NULL, FALSE);
g_return_val_if_fail (in != NULL, FALSE);
g_return_val_if_fail (out != NULL, FALSE);
/* first clean the existing context */
audio_convert_clean_context (ctx);
ctx->in = *in;
ctx->out = *out;
gst_channel_mix_setup_matrix (ctx);
idx = audio_convert_get_func_index (in);
if (!(ctx->unpack = unpack_funcs[idx]))
goto not_supported;
idx = audio_convert_get_func_index (out);
if (!(ctx->pack = pack_funcs[idx]))
goto not_supported;
/* check if input is in default format */
ctx->in_default = check_default (in);
/* check if channel mixer is passthrough */
ctx->mix_passthrough = gst_channel_mix_passthrough (ctx);
/* check if output is in default format */
ctx->out_default = check_default (out);
ctx->in_scale = 32 - in->depth;
ctx->out_scale = 32 - out->depth;
return TRUE;
not_supported:
{
return FALSE;
}
}
gboolean
audio_convert_clean_context (AudioConvertCtx * ctx)
{
g_return_val_if_fail (ctx != NULL, FALSE);
audio_convert_clean_fmt (&ctx->in);
audio_convert_clean_fmt (&ctx->out);
gst_channel_mix_unset_matrix (ctx);
g_free (ctx->tmpbuf);
ctx->tmpbuf = NULL;
ctx->tmpbufsize = 0;
return TRUE;
}
gboolean
audio_convert_get_sizes (AudioConvertCtx * ctx, gint samples, gint * srcsize,
gint * dstsize)
{
g_return_val_if_fail (ctx != NULL, FALSE);
if (srcsize)
*srcsize = samples * ctx->in.unit_size;
if (dstsize)
*dstsize = samples * ctx->out.unit_size;
return TRUE;
}
gboolean
audio_convert_convert (AudioConvertCtx * ctx, gpointer src,
gpointer dst, gint samples, gboolean src_writable)
{
gint insize, outsize;
gpointer outbuf, tmpbuf;
gint biggest = 0;
g_return_val_if_fail (ctx != NULL, FALSE);
g_return_val_if_fail (src != NULL, FALSE);
g_return_val_if_fail (dst != NULL, FALSE);
g_return_val_if_fail (samples >= 0, FALSE);
if (samples == 0)
return TRUE;
insize = ctx->in.unit_size * samples;
outsize = ctx->out.unit_size * samples;
/* find biggest temp buffer size */
if (!ctx->in_default)
biggest = insize * 32 / ctx->in.width;
if (!ctx->mix_passthrough)
biggest = MAX (biggest, outsize * 32 / ctx->out.width);
/* see if one of the buffers can be used as temp */
if (outsize >= biggest)
tmpbuf = dst;
else if (insize >= biggest && src_writable)
tmpbuf = src;
else {
if (biggest > ctx->tmpbufsize) {
ctx->tmpbuf = g_realloc (ctx->tmpbuf, biggest);
ctx->tmpbufsize = biggest;
}
tmpbuf = ctx->tmpbuf;
}
/* start conversion */
if (!ctx->in_default) {
/* check if final conversion */
if (!(ctx->out_default && ctx->mix_passthrough))
outbuf = tmpbuf;
else
outbuf = dst;
/* unpack to default format */
ctx->unpack (src, outbuf, ctx->in_scale, samples * ctx->in.channels);
src = outbuf;
}
if (!ctx->mix_passthrough) {
/* check if final conversion */
if (!ctx->out_default)
outbuf = tmpbuf;
else
outbuf = dst;
/* convert channels */
gst_channel_mix_mix (ctx, src, outbuf, samples);
src = outbuf;
}
if (!ctx->out_default) {
/* pack default format into dst */
ctx->pack (src, dst, ctx->out_scale, samples * ctx->out.channels);
}
return TRUE;
}
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