/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2008  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  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 "gstsbcutil.h"
#include "gstsbcenc.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 <marcel@holtmann.org>");

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;

	src_caps = sbc_enc_get_fixed_srcpad_caps(enc);
	if (!src_caps)
		return FALSE;
	res = gst_pad_set_caps(enc->srcpad, src_caps);
	gst_caps_unref(src_caps);

	return res;
}

gboolean gst_sbc_enc_fill_sbc_params(GstSbcEnc *enc, GstCaps *caps)
{
	if (!gst_caps_is_fixed(caps)) {
		GST_DEBUG_OBJECT(enc, "didn't receive fixed caps, "
				"returning false");
		return FALSE;
	}

	if (!gst_sbc_util_fill_sbc_params(&enc->sbc, caps))
		return FALSE;

	if (enc->rate != 0 && gst_sbc_parse_rate_from_sbc(enc->sbc.frequency)
				 != enc->rate)
		goto fail;

	if (enc->channels != 0 && gst_sbc_get_channel_number(enc->sbc.mode)
				!= enc->channels)
		goto fail;

	if (enc->blocks != 0 && gst_sbc_parse_blocks_from_sbc(enc->sbc.blocks)
				 != enc->blocks)
		goto fail;

	if (enc->subbands != 0 && gst_sbc_parse_subbands_from_sbc(
				enc->sbc.subbands) != enc->subbands)
		goto fail;

	if (enc->mode != SBC_ENC_DEFAULT_MODE && enc->sbc.mode != enc->mode)
		goto fail;

	if (enc->allocation != SBC_AM_AUTO &&
				enc->sbc.allocation != enc->allocation)
		goto fail;

	if (enc->bitpool != SBC_ENC_BITPOOL_AUTO &&
				enc->sbc.bitpool != enc->bitpool)
		goto fail;

	enc->codesize = sbc_get_codesize(&enc->sbc);
	enc->frame_length = sbc_get_frame_length(&enc->sbc);
	enc->frame_duration = sbc_get_frame_duration(&enc->sbc);

	GST_DEBUG_OBJECT(enc, "codesize: %d, frame_length: %d, frame_duration:"
			" %d", enc->codesize, enc->frame_length,
			enc->frame_duration);

	return TRUE;

fail:
	memset(&enc->sbc, 0, sizeof(sbc_t));
	return FALSE;
}

static GstFlowReturn sbc_enc_chain(GstPad *pad, GstBuffer *buffer)
{
	GstSbcEnc *enc = GST_SBC_ENC(gst_pad_get_parent(pad));
	GstAdapter *adapter = enc->adapter;
	GstFlowReturn res = GST_FLOW_OK;

	gst_adapter_push(adapter, buffer);

	while (gst_adapter_available(adapter) >= enc->codesize &&
			res == GST_FLOW_OK) {
		GstBuffer *output;
		GstCaps *caps;
		const guint8 *data;
		gint consumed;

		caps = GST_PAD_CAPS(enc->srcpad);
		res = gst_pad_alloc_buffer_and_set_caps(enc->srcpad,
						GST_BUFFER_OFFSET_NONE,
						enc->frame_length, caps,
						&output);
		if (res != GST_FLOW_OK)
			goto done;

		data = gst_adapter_peek(adapter, enc->codesize);

		consumed = sbc_encode(&enc->sbc, (gpointer) data,
					enc->codesize,
					GST_BUFFER_DATA(output),
					GST_BUFFER_SIZE(output), NULL);
		if (consumed <= 0) {
			GST_DEBUG_OBJECT(enc, "comsumed < 0, codesize: %d",
					enc->codesize);
			break;
		}
		gst_adapter_flush(adapter, consumed);

		GST_BUFFER_TIMESTAMP(output) = GST_BUFFER_TIMESTAMP(buffer);
		/* we have only 1 frame */
		GST_BUFFER_DURATION(output) = enc->frame_duration;

		res = gst_pad_push(enc->srcpad, output);

		if (res != GST_FLOW_OK)
			goto done;
	}

done:
	gst_object_unref(enc);

	return res;
}

static GstStateChangeReturn sbc_enc_change_state(GstElement *element,
						GstStateChange transition)
{
	GstSbcEnc *enc = GST_SBC_ENC(element);

	switch (transition) {
	case GST_STATE_CHANGE_READY_TO_PAUSED:
		GST_DEBUG("Setup subband codec");
		sbc_init(&enc->sbc, 0);
		break;

	case GST_STATE_CHANGE_PAUSED_TO_READY:
		GST_DEBUG("Finish subband codec");
		sbc_finish(&enc->sbc);
		break;

	default:
		break;
	}

	return parent_class->change_state(element, transition);
}

static void gst_sbc_enc_dispose(GObject *object)
{
	GstSbcEnc *enc = GST_SBC_ENC(object);

	if (enc->adapter != NULL)
		g_object_unref(G_OBJECT(enc->adapter));

	enc->adapter = NULL;
}

static void gst_sbc_enc_base_init(gpointer g_class)
{
	GstElementClass *element_class = GST_ELEMENT_CLASS(g_class);

	gst_element_class_add_pad_template(element_class,
		gst_static_pad_template_get(&sbc_enc_sink_factory));

	gst_element_class_add_pad_template(element_class,
		gst_static_pad_template_get(&sbc_enc_src_factory));

	gst_element_class_set_details(element_class, &sbc_enc_details);
}

static void gst_sbc_enc_set_property(GObject *object, guint prop_id,
					const GValue *value, GParamSpec *pspec)
{
	GstSbcEnc *enc = GST_SBC_ENC(object);

	/* changes to those properties will only happen on the next caps
	 * negotiation */

	switch (prop_id) {
	case PROP_MODE:
		enc->mode = g_value_get_enum(value);
		break;
	case PROP_ALLOCATION:
		enc->allocation = g_value_get_enum(value);
		break;
	case PROP_BLOCKS:
		enc->blocks = g_value_get_enum(value);
		break;
	case PROP_SUBBANDS:
		enc->subbands = g_value_get_enum(value);
		break;
	case PROP_BITPOOL:
		enc->bitpool = g_value_get_int(value);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
		break;
	}
}

static void gst_sbc_enc_get_property(GObject *object, guint prop_id,
					GValue *value, GParamSpec *pspec)
{
	GstSbcEnc *enc = GST_SBC_ENC(object);

	switch (prop_id) {
	case PROP_MODE:
		g_value_set_enum(value, enc->mode);
		break;
	case PROP_ALLOCATION:
		g_value_set_enum(value, enc->allocation);
		break;
	case PROP_BLOCKS:
		g_value_set_enum(value, enc->blocks);
		break;
	case PROP_SUBBANDS:
		g_value_set_enum(value, enc->subbands);
		break;
	case PROP_BITPOOL:
		g_value_set_int(value, enc->bitpool);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
		break;
	}
}

static void gst_sbc_enc_class_init(GstSbcEncClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS(klass);
	GstElementClass *element_class = GST_ELEMENT_CLASS(klass);

	parent_class = g_type_class_peek_parent(klass);

	object_class->set_property = GST_DEBUG_FUNCPTR(gst_sbc_enc_set_property);
	object_class->get_property = GST_DEBUG_FUNCPTR(gst_sbc_enc_get_property);
	object_class->dispose = GST_DEBUG_FUNCPTR(gst_sbc_enc_dispose);

	element_class->change_state = GST_DEBUG_FUNCPTR(sbc_enc_change_state);

	g_object_class_install_property(object_class, PROP_MODE,
			g_param_spec_enum("mode", "Mode",
				"Encoding mode", GST_TYPE_SBC_MODE,
				SBC_ENC_DEFAULT_MODE, G_PARAM_READWRITE));

	g_object_class_install_property(object_class, PROP_ALLOCATION,
			g_param_spec_enum("allocation", "Allocation",
				"Allocation method", GST_TYPE_SBC_ALLOCATION,
				SBC_ENC_DEFAULT_ALLOCATION, G_PARAM_READWRITE));

	g_object_class_install_property(object_class, PROP_BLOCKS,
			g_param_spec_enum("blocks", "Blocks",
				"Blocks", GST_TYPE_SBC_BLOCKS,
				SBC_ENC_DEFAULT_BLOCKS, G_PARAM_READWRITE));

	g_object_class_install_property(object_class, PROP_SUBBANDS,
			g_param_spec_enum("subbands", "Sub bands",
				"Number of sub bands", GST_TYPE_SBC_SUBBANDS,
				SBC_ENC_DEFAULT_SUB_BANDS, G_PARAM_READWRITE));

	g_object_class_install_property(object_class, PROP_BITPOOL,
			g_param_spec_int("bitpool", "Bitpool",
				"Bitpool (use 1 for automatic selection)",
				SBC_ENC_BITPOOL_AUTO, SBC_ENC_BITPOOL_MAX,
				SBC_ENC_BITPOOL_AUTO, G_PARAM_READWRITE));

	GST_DEBUG_CATEGORY_INIT(sbc_enc_debug, "sbcenc", 0,
						"SBC encoding element");
}

static void gst_sbc_enc_init(GstSbcEnc *self, GstSbcEncClass *klass)
{
	self->sinkpad = gst_pad_new_from_static_template(
		&sbc_enc_sink_factory, "sink");
	gst_pad_set_setcaps_function(self->sinkpad,
			GST_DEBUG_FUNCPTR(sbc_enc_sink_setcaps));
	gst_element_add_pad(GST_ELEMENT(self), self->sinkpad);

	self->srcpad = gst_pad_new_from_static_template(
		&sbc_enc_src_factory, "src");
	gst_pad_set_getcaps_function(self->srcpad,
		GST_DEBUG_FUNCPTR(sbc_enc_src_getcaps));
	gst_pad_set_setcaps_function(self->srcpad,
		GST_DEBUG_FUNCPTR(sbc_enc_src_setcaps));
	gst_element_add_pad(GST_ELEMENT(self), self->srcpad);

	gst_pad_set_chain_function(self->sinkpad,
		GST_DEBUG_FUNCPTR(sbc_enc_chain));

	self->subbands = SBC_ENC_DEFAULT_SUB_BANDS;
	self->blocks = SBC_ENC_DEFAULT_BLOCKS;
	self->mode = SBC_ENC_DEFAULT_MODE;
	self->allocation = SBC_ENC_DEFAULT_ALLOCATION;
	self->rate = SBC_ENC_DEFAULT_RATE;
	self->channels = SBC_ENC_DEFAULT_CHANNELS;
	self->bitpool = SBC_ENC_BITPOOL_AUTO;

	self->frame_length = 0;
	self->frame_duration = 0;

	self->adapter = gst_adapter_new();
}

gboolean gst_sbc_enc_plugin_init(GstPlugin *plugin)
{
	return gst_element_register(plugin, "sbcenc",
			GST_RANK_NONE, GST_TYPE_SBC_ENC);
}