gstsbcenc.c

这是Linux环境下的蓝牙源代码

	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);
}