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gstreamer/gst-libs/gst/audio/audio.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
/**
* SECTION:gstaudio
* @short_description: Support library for audio elements
*
* This library contains some helper functions for audio elements.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include "audio.h"
#include "audio-enumtypes.h"
#include <gst/gststructure.h>
#define SINT (GST_AUDIO_FORMAT_FLAG_INTEGER | GST_AUDIO_FORMAT_FLAG_SIGNED)
#define UINT (GST_AUDIO_FORMAT_FLAG_INTEGER)
#define MAKE_FORMAT(str,desc,flags,end,width,depth,silent) \
{ GST_AUDIO_FORMAT_ ##str, G_STRINGIFY(str), desc, flags, end, width, depth, silent }
#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", 0, 0, 0, 0},
/* 8 bit */
MAKE_FORMAT (S8, "8-bit signed PCM audio", SINT, 0, 8, 8, SILENT_0),
MAKE_FORMAT (U8, "8-bit unsigned PCM audio", UINT, 0, 8, 8, SILENT_U8),
/* 16 bit */
MAKE_FORMAT (S16LE, "16-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 16, 16,
SILENT_0),
MAKE_FORMAT (S16BE, "16-bit signed PCM audio", SINT, G_BIG_ENDIAN, 16, 16,
SILENT_0),
MAKE_FORMAT (U16LE, "16-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 16,
16, SILENT_U16LE),
MAKE_FORMAT (U16BE, "16-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 16, 16,
SILENT_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),
MAKE_FORMAT (S24_32BE, "24-bit signed PCM audio", SINT, G_BIG_ENDIAN, 32, 24,
SILENT_0),
MAKE_FORMAT (U24_32LE, "24-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 32,
24, SILENT_U24_32LE),
MAKE_FORMAT (U24_32BE, "24-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 32,
24, SILENT_U24_32BE),
/* 32 bit */
MAKE_FORMAT (S32LE, "32-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 32, 32,
SILENT_0),
MAKE_FORMAT (S32BE, "32-bit signed PCM audio", SINT, G_BIG_ENDIAN, 32, 32,
SILENT_0),
MAKE_FORMAT (U32LE, "32-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 32,
32, SILENT_U32LE),
MAKE_FORMAT (U32BE, "32-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 32, 32,
SILENT_U32BE),
/* 24 bit in 3 bytes */
MAKE_FORMAT (S24LE, "24-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24, 24,
SILENT_0),
MAKE_FORMAT (S24BE, "24-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24, 24,
SILENT_0),
MAKE_FORMAT (U24LE, "24-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 24,
24, SILENT_U24LE),
MAKE_FORMAT (U24BE, "24-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24, 24,
SILENT_U24BE),
/* 20 bit in 3 bytes */
MAKE_FORMAT (S20LE, "20-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24, 20,
SILENT_0),
MAKE_FORMAT (S20BE, "20-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24, 20,
SILENT_0),
MAKE_FORMAT (U20LE, "20-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 24,
20, SILENT_U20LE),
MAKE_FORMAT (U20BE, "20-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24, 20,
SILENT_U20BE),
/* 18 bit in 3 bytes */
MAKE_FORMAT (S18LE, "18-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24, 18,
SILENT_0),
MAKE_FORMAT (S18BE, "18-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24, 18,
SILENT_0),
MAKE_FORMAT (U18LE, "18-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 24,
18, SILENT_U18LE),
MAKE_FORMAT (U18BE, "18-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24, 18,
SILENT_U18BE),
/* float */
MAKE_FORMAT (F32LE, "32-bit floating-point audio",
GST_AUDIO_FORMAT_FLAG_FLOAT, G_LITTLE_ENDIAN, 32, 32,
SILENT_0),
MAKE_FORMAT (F32BE, "32-bit floating-point audio",
GST_AUDIO_FORMAT_FLAG_FLOAT, G_BIG_ENDIAN, 32, 32,
SILENT_0),
MAKE_FORMAT (F64LE, "64-bit floating-point audio",
GST_AUDIO_FORMAT_FLAG_FLOAT, G_LITTLE_ENDIAN, 64, 64,
SILENT_0),
MAKE_FORMAT (F64BE, "64-bit floating-point audio",
GST_AUDIO_FORMAT_FLAG_FLOAT, G_BIG_ENDIAN, 64, 64,
SILENT_0)
};
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 != GST_AUDIO_FORMAT_UNKNOWN, NULL);
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;
}
}
}
/**
* gst_audio_info_copy:
* @info: a #GstAudioInfo
*
* Copy a GstAudioInfo structure.
*
* Returns: a new #GstAudioInfo. free with gst_audio_info_free.
*/
GstAudioInfo *
gst_audio_info_copy (const GstAudioInfo * info)
{
return g_slice_dup (GstAudioInfo, info);
}
/**
* gst_audio_info_free:
* @info: a #GstAudioInfo
*
* Free a GstAudioInfo structure previously allocated with gst_audio_info_new()
* or gst_audio_info_copy().
*/
void
gst_audio_info_free (GstAudioInfo * info)
{
g_slice_free (GstAudioInfo, info);
}
G_DEFINE_BOXED_TYPE (GstAudioInfo, gst_audio_info,
(GBoxedCopyFunc) gst_audio_info_copy, (GBoxedFreeFunc) gst_audio_info_free);
/**
* gst_audio_info_new:
*
* Allocate a new #GstAudioInfo that is also initialized with
* gst_audio_info_init().
*
* Returns: a new #GstAudioInfo. free with gst_audio_info_free().
*/
GstAudioInfo *
gst_audio_info_new (void)
{
GstAudioInfo *info;
info = g_slice_new (GstAudioInfo);
gst_audio_info_init (info);
return info;
}
/**
* gst_audio_info_init:
* @info: a #GstAudioInfo
*
* Initialize @info with default values.
*/
void
gst_audio_info_init (GstAudioInfo * info)
{
g_return_if_fail (info != NULL);
memset (info, 0, sizeof (GstAudioInfo));
info->finfo = &formats[GST_AUDIO_FORMAT_UNKNOWN];
memset (&info->position, 0xff, sizeof (info->position));
}
static const GstAudioChannelPosition default_channel_order[64] = {
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_LFE1,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
GST_AUDIO_CHANNEL_POSITION_LFE2,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_TOP_CENTER,
GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_RIGHT,
GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER,
GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_WIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_WIDE_RIGHT,
GST_AUDIO_CHANNEL_POSITION_SURROUND_LEFT,
GST_AUDIO_CHANNEL_POSITION_SURROUND_RIGHT,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID
};
static gboolean
check_valid_channel_positions (const GstAudioChannelPosition * position,
gint channels, gboolean enforce_order, guint64 * channel_mask_out)
{
gint i, j;
guint64 channel_mask = 0;
if (channels == 1 && position[0] == GST_AUDIO_CHANNEL_POSITION_MONO) {
if (channel_mask_out)
*channel_mask_out = 0;
return TRUE;
}
if (channels > 0 && position[0] == GST_AUDIO_CHANNEL_POSITION_NONE) {
if (channel_mask_out)
*channel_mask_out = 0;
return TRUE;
}
j = 0;
for (i = 0; i < channels; i++) {
while (j < G_N_ELEMENTS (default_channel_order)
&& default_channel_order[j] != position[i])
j++;
if (position[i] == GST_AUDIO_CHANNEL_POSITION_INVALID ||
position[i] == GST_AUDIO_CHANNEL_POSITION_MONO ||
position[i] == GST_AUDIO_CHANNEL_POSITION_NONE)
return FALSE;
/* Is this in valid channel order? */
if (enforce_order && j == G_N_ELEMENTS (default_channel_order))
return FALSE;
j++;
if ((channel_mask & (G_GUINT64_CONSTANT (1) << position[i])))
return FALSE;
channel_mask |= (G_GUINT64_CONSTANT (1) << position[i]);
}
if (channel_mask_out)
*channel_mask_out = channel_mask;
return TRUE;
}
/**
* gst_audio_info_set_format:
* @info: a #GstAudioInfo
* @format: the format
* @rate: the samplerate
* @channels: the number of channels
* @position: the channel positions
*
* Set the default info for the audio info of @format and @rate and @channels.
*/
void
gst_audio_info_set_format (GstAudioInfo * info, GstAudioFormat format,
gint rate, gint channels, const GstAudioChannelPosition * position)
{
const GstAudioFormatInfo *finfo;
gint i;
g_return_if_fail (info != NULL);
g_return_if_fail (format != GST_AUDIO_FORMAT_UNKNOWN);
finfo = &formats[format];
info->flags = 0;
info->layout = GST_AUDIO_LAYOUT_INTERLEAVED;
info->finfo = finfo;
info->rate = rate;
info->channels = channels;
info->bpf = (finfo->width * channels) / 8;
memset (&info->position, 0xff, sizeof (info->position));
if (!position && channels == 1) {
info->position[0] = GST_AUDIO_CHANNEL_POSITION_MONO;
return;
} else if (!position && channels == 2) {
info->position[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
info->position[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
return;
} else {
if (!position
|| !check_valid_channel_positions (position, channels, TRUE, NULL)) {
if (position)
g_warning ("Invalid channel positions");
} else {
memcpy (&info->position, position,
info->channels * sizeof (info->position[0]));
if (info->position[0] == GST_AUDIO_CHANNEL_POSITION_NONE)
info->flags |= GST_AUDIO_FLAG_UNPOSITIONED;
return;
}
}
/* Otherwise a NONE layout */
info->flags |= GST_AUDIO_FLAG_UNPOSITIONED;
for (i = 0; i < MIN (64, channels); i++)
info->position[i] = GST_AUDIO_CHANNEL_POSITION_NONE;
}
/**
* gst_audio_info_from_caps:
* @info: a #GstAudioInfo
* @caps: a #GstCaps
*
* Parse @caps and update @info.
*
* Returns: TRUE if @caps could be parsed
*/
gboolean
gst_audio_info_from_caps (GstAudioInfo * info, const GstCaps * caps)
{
GstStructure *str;
const gchar *s;
GstAudioFormat format;
gint rate, channels;
guint64 channel_mask;
gint i;
GstAudioChannelPosition position[64];
g_return_val_if_fail (info != NULL, FALSE);
g_return_val_if_fail (caps != NULL, FALSE);
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
GST_DEBUG ("parsing caps %" GST_PTR_FORMAT, caps);
info->flags = 0;
str = gst_caps_get_structure (caps, 0);
if (!gst_structure_has_name (str, "audio/x-raw"))
goto wrong_name;
if (!(s = gst_structure_get_string (str, "format")))
goto no_format;
format = gst_audio_format_from_string (s);
if (format == GST_AUDIO_FORMAT_UNKNOWN)
goto unknown_format;
if (!(s = gst_structure_get_string (str, "layout")))
goto no_layout;
if (g_str_equal (s, "interleaved"))
info->layout = GST_AUDIO_LAYOUT_INTERLEAVED;
else if (g_str_equal (s, "non-interleaved"))
info->layout = GST_AUDIO_LAYOUT_NON_INTERLEAVED;
else
goto unknown_layout;
if (!gst_structure_get_int (str, "rate", &rate))
goto no_rate;
if (!gst_structure_get_int (str, "channels", &channels))
goto no_channels;
if (!gst_structure_get (str, "channel-mask", GST_TYPE_BITMASK, &channel_mask,
NULL)) {
if (channels == 1) {
position[0] = GST_AUDIO_CHANNEL_POSITION_MONO;
} else if (channels == 2) {
position[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
position[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
} else {
goto no_channel_mask;
}
} else if (channel_mask == 0) {
info->flags |= GST_AUDIO_FLAG_UNPOSITIONED;
for (i = 0; i < MIN (64, channels); i++)
position[i] = GST_AUDIO_CHANNEL_POSITION_NONE;
} else {
gint j;
j = 0;
for (i = 0; i < 64; i++) {
if ((channel_mask & (G_GUINT64_CONSTANT (1) << i))) {
position[j] = default_channel_order[i];
if (default_channel_order[i] == GST_AUDIO_CHANNEL_POSITION_INVALID)
goto invalid_channel_mask;
j++;
}
}
if (j != channels)
goto invalid_channel_mask;
}
gst_audio_info_set_format (info, format, rate, channels, position);
return TRUE;
/* ERROR */
wrong_name:
{
GST_ERROR ("wrong name, expected audio/x-raw");
return FALSE;
}
no_format:
{
GST_ERROR ("no format given");
return FALSE;
}
unknown_format:
{
GST_ERROR ("unknown format given");
return FALSE;
}
no_layout:
{
GST_ERROR ("no layout given");
return FALSE;
}
unknown_layout:
{
GST_ERROR ("unknown layout given");
return FALSE;
}
no_rate:
{
GST_ERROR ("no rate property given");
return FALSE;
}
no_channels:
{
GST_ERROR ("no channels property given");
return FALSE;
}
no_channel_mask:
{
GST_ERROR ("no channel-mask property given");
return FALSE;
}
invalid_channel_mask:
{
GST_ERROR ("Invalid channel mask 0x%016" G_GINT64_MODIFIER
"x for %d channels", channel_mask, channels);
return FALSE;
}
}
/**
* gst_audio_info_to_caps:
* @info: a #GstAudioInfo
*
* Convert the values of @info into a #GstCaps.
*
* Returns: (transfer full): the new #GstCaps containing the
* info of @info.
*/
GstCaps *
gst_audio_info_to_caps (const GstAudioInfo * info)
{
GstCaps *caps;
const gchar *format;
const gchar *layout;
GstAudioFlags flags;
g_return_val_if_fail (info != NULL, NULL);
g_return_val_if_fail (info->finfo != NULL, NULL);
g_return_val_if_fail (info->finfo->format != GST_AUDIO_FORMAT_UNKNOWN, NULL);
format = gst_audio_format_to_string (info->finfo->format);
g_return_val_if_fail (format != NULL, NULL);
if (info->layout == GST_AUDIO_LAYOUT_INTERLEAVED)
layout = "interleaved";
else if (info->layout == GST_AUDIO_LAYOUT_NON_INTERLEAVED)
layout = "non-interleaved";
else
g_return_val_if_reached (NULL);
flags = info->flags;
if ((flags & GST_AUDIO_FLAG_UNPOSITIONED) && info->channels > 1
&& info->position[0] != GST_AUDIO_CHANNEL_POSITION_NONE) {
flags &= ~GST_AUDIO_FLAG_UNPOSITIONED;
g_warning ("Unpositioned audio channel position flag set but "
"channel positions present");
} else if (!(flags & GST_AUDIO_FLAG_UNPOSITIONED) && info->channels > 1
&& info->position[0] == GST_AUDIO_CHANNEL_POSITION_NONE) {
flags |= GST_AUDIO_FLAG_UNPOSITIONED;
g_warning ("Unpositioned audio channel position flag not set "
"but no channel positions present");
}
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, format,
"layout", G_TYPE_STRING, layout,
"rate", G_TYPE_INT, info->rate,
"channels", G_TYPE_INT, info->channels, NULL);
if (info->channels > 1
|| info->position[0] != GST_AUDIO_CHANNEL_POSITION_MONO) {
guint64 channel_mask = 0;
if ((flags & GST_AUDIO_FLAG_UNPOSITIONED)) {
channel_mask = 0;
} else {
if (!check_valid_channel_positions (info->position, info->channels,
TRUE, &channel_mask))
goto invalid_channel_positions;
}
if (info->channels == 1
&& info->position[0] == GST_AUDIO_CHANNEL_POSITION_MONO) {
/* Default mono special case */
} else {
gst_caps_set_simple (caps, "channel-mask", GST_TYPE_BITMASK, channel_mask,
NULL);
}
}
return caps;
invalid_channel_positions:
{
GST_ERROR ("Invalid channel positions");
gst_caps_unref (caps);
return NULL;
}
}
/**
* gst_audio_format_convert:
* @info: a #GstAudioInfo
* @src_format: #GstFormat of the @src_value
* @src_value: value to convert
* @dest_format: #GstFormat of the @dest_value
* @dest_value: pointer to destination value
*
* Converts among various #GstFormat types. This function handles
* GST_FORMAT_BYTES, GST_FORMAT_TIME, and GST_FORMAT_DEFAULT. For
* raw audio, GST_FORMAT_DEFAULT corresponds to audio frames. This
* function can be used to handle pad queries of the type GST_QUERY_CONVERT.
*
* Returns: TRUE if the conversion was successful.
*/
gboolean
gst_audio_info_convert (const GstAudioInfo * info,
GstFormat src_fmt, gint64 src_val, GstFormat dest_fmt, gint64 * dest_val)
{
gboolean res = TRUE;
gint bpf, rate;
GST_DEBUG ("converting value %" G_GINT64_FORMAT " from %s (%d) to %s (%d)",
src_val, gst_format_get_name (src_fmt), src_fmt,
gst_format_get_name (dest_fmt), dest_fmt);
if (src_fmt == dest_fmt || src_val == -1) {
*dest_val = src_val;
goto done;
}
/* get important info */
bpf = GST_AUDIO_INFO_BPF (info);
rate = GST_AUDIO_INFO_RATE (info);
if (bpf == 0 || rate == 0) {
GST_DEBUG ("no rate or bpf configured");
res = FALSE;
goto done;
}
switch (src_fmt) {
case GST_FORMAT_BYTES:
switch (dest_fmt) {
case GST_FORMAT_TIME:
*dest_val = GST_FRAMES_TO_CLOCK_TIME (src_val / bpf, rate);
break;
case GST_FORMAT_DEFAULT:
*dest_val = src_val / bpf;
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_DEFAULT:
switch (dest_fmt) {
case GST_FORMAT_TIME:
*dest_val = GST_FRAMES_TO_CLOCK_TIME (src_val, rate);
break;
case GST_FORMAT_BYTES:
*dest_val = src_val * bpf;
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_TIME:
switch (dest_fmt) {
case GST_FORMAT_DEFAULT:
*dest_val = GST_CLOCK_TIME_TO_FRAMES (src_val, rate);
break;
case GST_FORMAT_BYTES:
*dest_val = GST_CLOCK_TIME_TO_FRAMES (src_val, rate);
*dest_val *= bpf;
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
done:
GST_DEBUG ("ret=%d result %" G_GINT64_FORMAT, res, *dest_val);
return res;
}
/**
* gst_audio_buffer_clip:
* @buffer: The buffer to clip.
* @segment: Segment in %GST_FORMAT_TIME or %GST_FORMAT_DEFAULT to which
* the buffer should be clipped.
* @rate: sample rate.
* @bpf: size of one audio frame in bytes. This is the size of one sample
* * channels.
*
* Clip the buffer to the given %GstSegment.
*
* After calling this function the caller does not own a reference to
* @buffer anymore.
*
* Returns: %NULL if the buffer is completely outside the configured segment,
* otherwise the clipped buffer is returned.
*
* If the buffer has no timestamp, it is assumed to be inside the segment and
* is not clipped
*
* Since: 0.10.14
*/
GstBuffer *
gst_audio_buffer_clip (GstBuffer * buffer, GstSegment * segment, gint rate,
gint bpf)
{
GstBuffer *ret;
GstClockTime timestamp = GST_CLOCK_TIME_NONE, duration = GST_CLOCK_TIME_NONE;
guint64 offset = GST_BUFFER_OFFSET_NONE, offset_end = GST_BUFFER_OFFSET_NONE;
gsize trim, size;
gboolean change_duration = TRUE, change_offset = TRUE, change_offset_end =
TRUE;
g_return_val_if_fail (segment->format == GST_FORMAT_TIME ||
segment->format == GST_FORMAT_DEFAULT, buffer);
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
/* No timestamp - assume the buffer is completely in the segment */
return buffer;
/* Get copies of the buffer metadata to change later.
* Calculate the missing values for the calculations,
* they won't be changed later though. */
trim = 0;
size = gst_buffer_get_size (buffer);
timestamp = GST_BUFFER_TIMESTAMP (buffer);
GST_DEBUG ("timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));
if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
duration = GST_BUFFER_DURATION (buffer);
} else {
change_duration = FALSE;
duration = gst_util_uint64_scale (size / bpf, GST_SECOND, rate);
}
if (GST_BUFFER_OFFSET_IS_VALID (buffer)) {
offset = GST_BUFFER_OFFSET (buffer);
} else {
change_offset = FALSE;
offset = 0;
}
if (GST_BUFFER_OFFSET_END_IS_VALID (buffer)) {
offset_end = GST_BUFFER_OFFSET_END (buffer);
} else {
change_offset_end = FALSE;
offset_end = offset + size / bpf;
}
if (segment->format == GST_FORMAT_TIME) {
/* Handle clipping for GST_FORMAT_TIME */
guint64 start, stop, cstart, cstop, diff;
start = timestamp;
stop = timestamp + duration;
if (gst_segment_clip (segment, GST_FORMAT_TIME,
start, stop, &cstart, &cstop)) {
diff = cstart - start;
if (diff > 0) {
timestamp = cstart;
if (change_duration)
duration -= diff;
diff = gst_util_uint64_scale (diff, rate, GST_SECOND);
if (change_offset)
offset += diff;
trim += diff * bpf;
size -= diff * bpf;
}
diff = stop - cstop;
if (diff > 0) {
/* duration is always valid if stop is valid */
duration -= diff;
diff = gst_util_uint64_scale (diff, rate, GST_SECOND);
if (change_offset_end)
offset_end -= diff;
size -= diff * bpf;
}
} else {
gst_buffer_unref (buffer);
return NULL;
}
} else {
/* Handle clipping for GST_FORMAT_DEFAULT */
guint64 start, stop, cstart, cstop, diff;
g_return_val_if_fail (GST_BUFFER_OFFSET_IS_VALID (buffer), buffer);
start = offset;
stop = offset_end;
if (gst_segment_clip (segment, GST_FORMAT_DEFAULT,
start, stop, &cstart, &cstop)) {
diff = cstart - start;
if (diff > 0) {
offset = cstart;
timestamp = gst_util_uint64_scale (cstart, GST_SECOND, rate);
if (change_duration)
duration -= gst_util_uint64_scale (diff, GST_SECOND, rate);
trim += diff * bpf;
size -= diff * bpf;
}
diff = stop - cstop;
if (diff > 0) {
offset_end = cstop;
if (change_duration)
duration -= gst_util_uint64_scale (diff, GST_SECOND, rate);
size -= diff * bpf;
}
} else {
gst_buffer_unref (buffer);
return NULL;
}
}
/* Get a writable buffer and apply all changes */
GST_DEBUG ("trim %" G_GSIZE_FORMAT " size %" G_GSIZE_FORMAT, trim, size);
ret = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, trim, size);
gst_buffer_unref (buffer);
GST_DEBUG ("timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));
GST_BUFFER_TIMESTAMP (ret) = timestamp;
if (change_duration)
GST_BUFFER_DURATION (ret) = duration;
if (change_offset)
GST_BUFFER_OFFSET (ret) = offset;
if (change_offset_end)
GST_BUFFER_OFFSET_END (ret) = offset_end;
return ret;
}
/**
* gst_audio_reorder_channels:
* @data: The pointer to the memory.
* @size: The size of the memory.
* @format: The %GstAudioFormat of the buffer.
* @channels: The number of channels.
* @from: The channel positions in the buffer.
* @to: The channel positions to convert to.
*
* Reorders @data from the channel positions @from to the channel
* positions @to. @from and @to must contain the same number of
* positions and the same positions, only in a different order.
*
* Returns: %TRUE if the reordering was possible.
*/
gboolean
gst_audio_reorder_channels (gpointer data, gsize size, GstAudioFormat format,
gint channels, const GstAudioChannelPosition * from,
const GstAudioChannelPosition * to)
{
const GstAudioFormatInfo *info;
gint i, j, n;
gint reorder_map[64] = { 0, };
guint8 *ptr;
gint bpf, bps;
guint8 tmp[64 * 8];
info = gst_audio_format_get_info (format);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (from != NULL, FALSE);
g_return_val_if_fail (to != NULL, FALSE);
g_return_val_if_fail (info != NULL && info->width > 0, FALSE);
g_return_val_if_fail (info->width > 0, FALSE);
g_return_val_if_fail (info->width <= 8 * 64, FALSE);
g_return_val_if_fail (size % ((info->width * channels) / 8) == 0, FALSE);
g_return_val_if_fail (channels > 0, FALSE);
g_return_val_if_fail (channels <= 64, FALSE);
if (size == 0)
return TRUE;
if (memcmp (from, to, channels * sizeof (from[0])) == 0)
return TRUE;
if (!gst_audio_get_channel_reorder_map (channels, from, to, reorder_map))
return FALSE;
bps = info->width / 8;
bpf = bps * channels;
ptr = data;
n = size / bpf;
for (i = 0; i < n; i++) {
memcpy (tmp, ptr, bpf);
for (j = 0; j < channels; j++)
memcpy (ptr + reorder_map[j] * bps, tmp + j * bps, bps);
ptr += bpf;
}
return TRUE;
}
/**
* gst_audio_buffer_reorder_channels:
* @buffer: The buffer to reorder.
* @format: The %GstAudioFormat of the buffer.
* @channels: The number of channels.
* @from: The channel positions in the buffer.
* @to: The channel positions to convert to.
*
* Reorders @buffer from the channel positions @from to the channel
* positions @to. @from and @to must contain the same number of
* positions and the same positions, only in a different order.
* @buffer must be writable.
*
* Returns: %TRUE if the reordering was possible.
*/
gboolean
gst_audio_buffer_reorder_channels (GstBuffer * buffer,
GstAudioFormat format, gint channels,
const GstAudioChannelPosition * from, const GstAudioChannelPosition * to)
{
GstMapInfo info;
gboolean ret;
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
gst_buffer_map (buffer, &info, GST_MAP_READWRITE);
ret =
gst_audio_reorder_channels (info.data, info.size, format, channels, from,
to);
gst_buffer_unmap (buffer, &info);
return ret;
}
/**
* gst_audio_check_valid_channel_positions:
* @position: The %GstAudioChannelPositions to check.
* @channels: The number of channels.
* @force_order: Only consider the GStreamer channel order.
*
* Checks if @position contains valid channel positions for
* @channels channels. If @force_order is %TRUE it additionally
* checks if the channels are in the order required by GStreamer.
*
* Returns: %TRUE if the channel positions are valid.
*/
gboolean
gst_audio_check_valid_channel_positions (const GstAudioChannelPosition *
position, gint channels, gboolean force_order)
{
return check_valid_channel_positions (position, channels, force_order, NULL);
}
/**
* gst_audio_channel_positions_to_mask:
* @position: The %GstAudioChannelPositions
* @channels: The number of channels.
* @channel_mask: the output channel mask
*
* Convert the @position array of @channels channels to a bitmask.
*
* Returns: %TRUE if the channel positions are valid and could be converted.
*/
gboolean
gst_audio_channel_positions_to_mask (const GstAudioChannelPosition * position,
gint channels, guint64 * channel_mask)
{
return check_valid_channel_positions (position, channels, FALSE,
channel_mask);
}
/**
* gst_audio_get_channel_reorder_map:
* @channels: The number of channels.
* @from: The channel positions to reorder from.
* @to: The channel positions to reorder to.
* @reorder_map: Pointer to the reorder map.
*
* Returns a reorder map for @from to @to that can be used in
* custom channel reordering code, e.g. to convert from or to the
* GStreamer channel order. @from and @to must contain the same
* number of positions and the same positions, only in a
* different order.
*
* The resulting @reorder_map can be used for reordering by assigning
* channel i of the input to channel reorder_map[i] of the output.
*
* Returns: %TRUE if the channel positions are valid and reordering
* is possible.
*/
gboolean
gst_audio_get_channel_reorder_map (gint channels,
const GstAudioChannelPosition * from, const GstAudioChannelPosition * to,
gint * reorder_map)
{
gint i, j;
g_return_val_if_fail (reorder_map != NULL, FALSE);
g_return_val_if_fail (channels > 0, FALSE);
g_return_val_if_fail (from != NULL, FALSE);
g_return_val_if_fail (to != NULL, FALSE);
g_return_val_if_fail (check_valid_channel_positions (from, channels, FALSE,
NULL), FALSE);
g_return_val_if_fail (check_valid_channel_positions (to, channels, FALSE,
NULL), FALSE);
/* Build reorder map and check compatibility */
for (i = 0; i < channels; i++) {
if (from[i] == GST_AUDIO_CHANNEL_POSITION_NONE
|| to[i] == GST_AUDIO_CHANNEL_POSITION_NONE)
return FALSE;
if (from[i] == GST_AUDIO_CHANNEL_POSITION_INVALID
|| to[i] == GST_AUDIO_CHANNEL_POSITION_INVALID)
return FALSE;
if (from[i] == GST_AUDIO_CHANNEL_POSITION_MONO
|| to[i] == GST_AUDIO_CHANNEL_POSITION_MONO)
return FALSE;
for (j = 0; j < channels; j++) {
if (from[i] == to[j]) {
reorder_map[i] = j;
break;
}
}
/* Not all channels present in both */
if (j == channels)
return FALSE;
}
return TRUE;
}
/**
* gst_audio_channel_positions_to_valid_order:
* @position: The channel positions to reorder to.
* @channels: The number of channels.
*
* Reorders the channel positions in @position from any order to
* the GStreamer channel order.
*
* Returns: %TRUE if the channel positions are valid and reordering
* was successful.
*/
gboolean
gst_audio_channel_positions_to_valid_order (GstAudioChannelPosition * position,
gint channels)
{
GstAudioChannelPosition tmp[64];
guint64 channel_mask = 0;
gint i, j;
g_return_val_if_fail (channels > 0, FALSE);
g_return_val_if_fail (position != NULL, FALSE);
g_return_val_if_fail (check_valid_channel_positions (position, channels,
FALSE, NULL), FALSE);
if (channels == 1 && position[0] == GST_AUDIO_CHANNEL_POSITION_MONO)
return TRUE;
if (position[0] == GST_AUDIO_CHANNEL_POSITION_NONE)
return TRUE;
check_valid_channel_positions (position, channels, FALSE, &channel_mask);
memset (tmp, 0xff, sizeof (tmp));
j = 0;
for (i = 0; i < 64; i++) {
if ((channel_mask & (G_GUINT64_CONSTANT (1) << i))) {
tmp[j] = i;
j++;
}
}
memcpy (position, tmp, sizeof (tmp[0]) * channels);
return TRUE;
}
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