gstsbcenc.c

这是Linux环境下的蓝牙源代码

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2008  Marcel Holtmann <[e-mail]>
 *
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>

#include "gstsbcenc.h"
#include "gstsbcutil.h"

#define SBC_ENC_DEFAULT_MODE SBC_MODE_AUTO
#define SBC_ENC_DEFAULT_BLOCKS 0
#define SBC_ENC_DEFAULT_SUB_BANDS 0
#define SBC_ENC_DEFAULT_ALLOCATION SBC_AM_AUTO
#define SBC_ENC_DEFAULT_RATE 0
#define SBC_ENC_DEFAULT_CHANNELS 0

#define SBC_ENC_BITPOOL_AUTO 1
#define SBC_ENC_BITPOOL_MIN 2
#define SBC_ENC_BITPOOL_MIN_STR "2"
#define SBC_ENC_BITPOOL_MAX 64
#define SBC_ENC_BITPOOL_MAX_STR "64"

GST_DEBUG_CATEGORY_STATIC(sbc_enc_debug);
#define GST_CAT_DEFAULT sbc_enc_debug

#define GST_TYPE_SBC_MODE (gst_sbc_mode_get_type())

static GType gst_sbc_mode_get_type(void)
{
	static GType sbc_mode_type = 0;
	static GEnumValue sbc_modes[] = {
		{  SBC_MODE_MONO,		"Mono",		"mono"	},
		{  SBC_MODE_DUAL_CHANNEL,	"Dual Channel",	"dual"	},
		{  SBC_MODE_STEREO,		"Stereo",	"stereo"},
		{  SBC_MODE_JOINT_STEREO,	"Joint Stereo",	"joint"	},
		{  SBC_MODE_AUTO,		"Auto",		"auto"	},
		{ -1, NULL, NULL}
	};

	if (!sbc_mode_type)
		sbc_mode_type = g_enum_register_static("GstSbcMode", sbc_modes);

	return sbc_mode_type;
}

#define GST_TYPE_SBC_ALLOCATION (gst_sbc_allocation_get_type())

static GType gst_sbc_allocation_get_type(void)
{
	static GType sbc_allocation_type = 0;
	static GEnumValue sbc_allocations[] = {
		{ SBC_AM_LOUDNESS,	"Loudness",	"loudness" },
		{ SBC_AM_SNR,		"SNR",		"snr" },
		{ SBC_AM_AUTO,		"Auto",		"auto" },
		{ -1, NULL, NULL}
	};

	if (!sbc_allocation_type)
		sbc_allocation_type = g_enum_register_static(
				"GstSbcAllocation", sbc_allocations);

	return sbc_allocation_type;
}

#define GST_TYPE_SBC_BLOCKS (gst_sbc_blocks_get_type())

static GType gst_sbc_blocks_get_type(void)
{
	static GType sbc_blocks_type = 0;
	static GEnumValue sbc_blocks[] = {
		{ 0,	"Auto",		"auto" },
		{ 4,	"4",		"4" },
		{ 8,	"8",		"8" },
		{ 12,	"12",		"12" },
		{ 16,	"16",		"16" },
		{ -1, NULL, NULL}
	};

	if (!sbc_blocks_type)
		sbc_blocks_type = g_enum_register_static(
				"GstSbcBlocks", sbc_blocks);

	return sbc_blocks_type;
}

#define GST_TYPE_SBC_SUBBANDS (gst_sbc_subbands_get_type())

static GType gst_sbc_subbands_get_type(void)
{
	static GType sbc_subbands_type = 0;
	static GEnumValue sbc_subbands[] = {
		{ 0,	"Auto",		"auto" },
		{ 4,	"4 subbands",	"4" },
		{ 8,	"8 subbands",	"8" },
		{ -1, NULL, NULL}
	};

	if (!sbc_subbands_type)
		sbc_subbands_type = g_enum_register_static(
				"GstSbcSubbands", sbc_subbands);

	return sbc_subbands_type;
}

enum {
	PROP_0,
	PROP_MODE,
	PROP_ALLOCATION,
	PROP_BLOCKS,
	PROP_SUBBANDS,
	PROP_BITPOOL
};

GST_BOILERPLATE(GstSbcEnc, gst_sbc_enc, GstElement, GST_TYPE_ELEMENT);

static const GstElementDetails sbc_enc_details =
	GST_ELEMENT_DETAILS("Bluetooth SBC encoder",
				"Codec/Encoder/Audio",
				"Encode a SBC audio stream",
				"Marcel Holtmann <[e-mail]>");

static GstStaticPadTemplate sbc_enc_sink_factory =
	GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
		GST_STATIC_CAPS("audio/x-raw-int, "
				"rate = (int) { 16000, 32000, 44100, 48000 }, "
				"channels = (int) [ 1, 2 ], "
				"endianness = (int) LITTLE_ENDIAN, "
				"signed = (boolean) true, "
				"width = (int) 16, "
				"depth = (int) 16"));

static GstStaticPadTemplate sbc_enc_src_factory =
	GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS,
		GST_STATIC_CAPS("audio/x-sbc, "
				"rate = (int) { 16000, 32000, 44100, 48000 }, "
				"channels = (int) [ 1, 2 ], "
				"mode = (string) { \"mono\", \"dual\", \"stereo\", \"joint\" }, "
				"blocks = (int) { 4, 8, 12, 16 }, "
				"subbands = (int) { 4, 8 }, "
				"allocation = (string) { \"snr\", \"loudness\" }, "
				"bitpool = (int) [ " SBC_ENC_BITPOOL_MIN_STR
				", " SBC_ENC_BITPOOL_MAX_STR " ]"));

gboolean gst_sbc_enc_fill_sbc_params(GstSbcEnc *enc, GstCaps *caps);

static GstCaps* sbc_enc_generate_srcpad_caps(GstSbcEnc *enc)
{
	GstCaps* src_caps;
	GstStructure *structure;
	GEnumValue *enum_value;
	GEnumClass *enum_class;
	GValue *value;

	src_caps = gst_caps_copy(gst_pad_get_pad_template_caps(enc->srcpad));
	structure = gst_caps_get_structure(src_caps, 0);

	value = g_new0(GValue, 1);

	if (enc->rate != 0)
		gst_sbc_util_set_structure_int_param(structure, "rate",
			enc->rate, value);

	if (enc->channels != 0)
		gst_sbc_util_set_structure_int_param(structure, "channels",
			enc->channels, value);

	if (enc->subbands != 0)
		gst_sbc_util_set_structure_int_param(structure, "subbands",
			enc->subbands, value);

	if (enc->blocks != 0)
		gst_sbc_util_set_structure_int_param(structure, "blocks",
			enc->blocks, value);

	if (enc->bitpool != SBC_ENC_BITPOOL_AUTO)
		gst_sbc_util_set_structure_int_param(structure, "bitpool",
			enc->bitpool, value);

	if (enc->mode != SBC_ENC_DEFAULT_MODE) {
		enum_class = g_type_class_ref(GST_TYPE_SBC_MODE);
		enum_value = g_enum_get_value(enum_class, enc->mode);
		gst_sbc_util_set_structure_string_param(structure, "mode",
			enum_value->value_nick, value);
		g_type_class_unref(enum_class);
	}

	if (enc->allocation != SBC_AM_AUTO) {
		enum_class = g_type_class_ref(GST_TYPE_SBC_ALLOCATION);
		enum_value = g_enum_get_value(enum_class, enc->allocation);
		gst_sbc_util_set_structure_string_param(structure, "allocation",
			enum_value->value_nick, value);
		g_type_class_unref(enum_class);
	}

	g_free(value);

	return src_caps;
}

static GstCaps* sbc_enc_src_getcaps (GstPad * pad)
{
	GstSbcEnc *enc;

	enc = GST_SBC_ENC(GST_PAD_PARENT(pad));

	return sbc_enc_generate_srcpad_caps(enc);
}

static gboolean sbc_enc_src_setcaps (GstPad *pad, GstCaps *caps)
{
	GstSbcEnc *enc = GST_SBC_ENC(GST_PAD_PARENT(pad));

	GST_LOG_OBJECT(enc, "setting srcpad caps");

	return gst_sbc_enc_fill_sbc_params(enc, caps);
}

static GstCaps* sbc_enc_src_caps_fixate(GstSbcEnc *enc, GstCaps *caps)
{
	gchar *error_message = NULL;
	GstCaps* result;

	result = gst_sbc_util_caps_fixate(caps, &error_message);

	if (!result) {
		GST_WARNING_OBJECT (enc, "Invalid input caps caused parsing "
				"error: %s", error_message);
		g_free(error_message);
		return NULL;
	}

	return result;
}

static GstCaps* sbc_enc_get_fixed_srcpad_caps(GstSbcEnc *enc)
{
	GstCaps *caps;
	gboolean res = TRUE;
	GstCaps *result_caps = NULL;

	caps = gst_pad_get_allowed_caps(enc->srcpad);
	if (caps == NULL)
		caps = sbc_enc_src_getcaps(enc->srcpad);

	if (caps == GST_CAPS_NONE || gst_caps_is_empty(caps)) {
		res = FALSE;
		goto done;
	}

	result_caps = sbc_enc_src_caps_fixate(enc, caps);

done:
	gst_caps_unref(caps);

	if (!res)
		return NULL;

	return result_caps;
}

static gboolean sbc_enc_sink_setcaps (GstPad * pad, GstCaps * caps)
{
	GstSbcEnc *enc;
	GstStructure *structure;
	GstCaps *src_caps;
	gint rate, channels;
	gboolean res;

	enc = GST_SBC_ENC(GST_PAD_PARENT (pad));
	structure = gst_caps_get_structure(caps, 0);

	if (!gst_structure_get_int(structure, "rate", &rate))
		return FALSE;
	if (!gst_structure_get_int(structure, "channels", &channels))
		return FALSE;

	enc->rate = rate;
	enc->channels = channels;