3 files changed, 249 insertions, 0 deletions

diff --git a/Graphic_Equalizer/src/audio/audiodriver.hcc b/Graphic_Equalizer/src/audio/audiodriver.hcc
new file mode 100644
index 0000000..0038ef6
--- /dev/null
+++ b/Graphic_Equalizer/src/audio/audiodriver.hcc
@@ -0,0 +1,84 @@
+/*! \file header_templace.hcc

+ *

+ * \section generic Message build up information and more

+ *

+ * \section project Project information.

+ * Project Graphic Equalizer\n

+ * \author 

+ * \date 20041011

+ * \version 0.1

+ *

+ * \section copyright Copyright

+ * Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved

+ *

+ * \section history Change history

+ * 20041011: \n	Initial version

+ *

+ ********************************************************************/

+

+/******** System Includes *************/

+#include <stdlib.hch>

+

+#include "pal_master.hch"

+

+/******** Application Includes ********/

+#include "audiodriver.hch"

+#include "audiodriver_shared.hch"

+

+

+

+/*! \fn		void	audio_init(unsigned 4 gain_level,

+ *				   unsigned 1 input_source,

+ *				   unsigned 3 sample_rate)

+ *

+ * \brief	Set some inital values to the audio hardware.

+ *

+ * \param	unsigned 4 gain_level	Set the input amplifier to this

+ *					amplification level.

+ * \param	unsigned 1 input_source	Choose between microphone input

+ *					or linein input

+ * \param	unsigned 3 sample_rate	Set the sample rate between 8000

+ *					and 48000

+ *

+ * \return	void

+ * \retval	void

+ *

+ */

+void audio_init(unsigned 4 gain_level,

+		unsigned 1 input_source,

+		unsigned 3 sample_rate) {

+	/*

+	 * We simply call the appropiate handlers and pass values along. We

+	 * Don't set the mute on input gain. We have volume control to do this.

+	 * Input and Output sampling rates are equal. We dont' need different

+	 * rates.

+	 */

+	RC200AudioInSetGain(FALSE, gain_level, gain_level);

+	RC200AudioInSetInput(input_source);

+	PalAudioInSetSampleRate(AudioIn, sample_rate);

+	PalAudioOutSetSampleRate(AudioOut, sample_rate);

+} /* --- audio_init() --- */

+

+

+

+/*! \fn		void audio_main(void);

+ * \brief	Main audiodriver. This function never returns! It calls the

+ *		audiohandlers and stores samples into a global array. Once 64

+ *		Samples are collected it raises a signal AUDIO_READY to let

+ *		other processes know it's ready. We use quadruple buffering for

+ *		audio input and double buffering for audio output.

+ * 

+ * \param	void

+ *

+ * \return	Never Returns.

+ * \retval	void

+ */

+void audio_main(void) {

+	/*

+	 * Setup audio pointers.

+	 */

+	macro expr AudioIn = PalAudioInCT(0);

+	macro expr AudioOut = PalAudioOutCT(0);

+

+	

+} /* --- audio_main() --- */

diff --git a/Graphic_Equalizer/src/audio/main.hcc b/Graphic_Equalizer/src/audio/main.hcc
new file mode 100644
index 0000000..cd98565
--- /dev/null
+++ b/Graphic_Equalizer/src/audio/main.hcc
@@ -0,0 +1,88 @@
+/*! \file header_templace.hcc

+ *

+ * \section generic Message build up information and more

+ *

+ * \section project Project information.

+ * Project Graphic Equalizer\n

+ * \author 

+ * \date 20041011

+ * \version 0.1

+ *

+ * \section copyright Copyright

+ * Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved

+ *

+ * \section history Change history

+ * 20041011: \n	Initial version

+ *

+ ********************************************************************/

+

+

+/*

+ * Set the Clock rate for this domain. 50.0 Mhz is minimally required while

+ * performing audio tasks.

+ */

+#define PAL_TARGET_CLOCK_RATE 50000000

+

+/******** System Includes *************/

+#include <stdlib.hch>

+

+#include "pal_master.hch"

+

+/******** Application Includes ********/

+#include "audiodriver.hch"

+

+

+/*

+ * Request Clockrate. Approximated ClockRate is compiler assigned.

+ */

+static macro expr ClockRate = PAL_ACTUAL_CLOCK_RATE;

+

+

+

+/*! \fn		void main(void);

+ * \brief	Main audio handling loop.

+ * 

+ * \param	void

+ *

+ * \return	void

+ * \retval	void

+ */

+void main(void) {

+	/* Setup Audio I/O Pointers */

+	macro expr AudioIn  = PalAudioInCT(0);

+	macro expr AudioOut = PalAudioOutCT(0);

+

+	/*

+	 * Check library versions and Request VideoOutput.

+	 * We need at least Major Version 1 and minor version 2.

+	 */

+	PalVersionRequire(1, 2);

+	PalAudioInRequire(1);

+	PalAudioOutRequire(1);

+

+	/*

+	 * Run The Following main tasks in parallel.

+	 */

+	par {

+		/*

+		 * Primary task is to 'Run' several hardware simultaniously.

+		 * Audio I/O needs to be in sync.

+		 */

+		PalAudioInRun(AudioIn, ClockRate);

+		PalAudioOutRun(AudioOut, ClockRate);

+		

+		/* Parallel to our Primary tasks we run the application. */

+		seq {

+			/* But first we need to enable and initialize the audio. */

+			PalAudioInEnable(AudioIn);

+			PalAudioOutEnable(AudioOut);

+			audio_init(7, LINE_IN, SR_44100);

+			par {

+				/*

+				 * From here we run the main audio loop.

+				 */

+				audio_main();

+			}

+		}

+	}

+} /* --- main() --- */

diff --git a/Graphic_Equalizer/src/audio/sample.hcc b/Graphic_Equalizer/src/audio/sample.hcc
new file mode 100644
index 0000000..95139e7
--- /dev/null
+++ b/Graphic_Equalizer/src/audio/sample.hcc
@@ -0,0 +1,77 @@
+/*! \file sample.hcc

+ *

+ * \section generic Handle audio sampling and buffer rotation.

+ *

+ * \section project Project information.

+ * Project Graphic Equalizer\n

+ * \author O.M. Schinagl

+ * \date 20041021

+ * \version 0.1

+ *

+ * \section copyright Copyright

+ * Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved

+ *

+ * \section history Change history

+ * 20041021: O.M. Schinagl\n	Initial version

+ *

+ ********************************************************************/

+

+/******** System Includes *************/

+

+/******** Application Includes ********/

+

+

+

+/*

+ * 64 step counter to keep track of our samples.

+ */

+unsigned 8 sample_count;

+signed 16 *audio_in_ptr;

+

+

+/*! \fn		void sample_add(in_sample);

+ * \brief	This procedure adds the supplied sample to our internal array.

+ * 

+ * \param	in_sample	16 bits signed sample to be added.

+ *

+ * \return	void

+ * \retval	void

+ */

+void sample_add(in_sample) {

+	/*

+	 * We only want a 64 sample buffer, hence we circulate around only the

+	 * last 6 bits.

+	 */

+	audio_in_ptr[sample_count <-6] = in_sample;

+	sample_count++;

+} /* --- sample_add() --- */

+

+

+

+/*! \fn		void sample_rotate_buffers(void);

+ * \brief	This procedure rotates our buffers around if 64 samples are

+ *		read into our current buffer.

+ * 

+ * \param	in_sample	16 bits signed sample to be added.

+ *

+ * \return	void

+ * \retval	void

+ */

+void sample_rotate_buffers(in_sample) {

+	/*

+	 * We only want to read 64 samples, but calculations work nicer if we

+	 * use 256 samples. Therefor we circulate our audio pointer around.

+	 */

+	if (!(sample_count <- 6)) {

+		/*

+		 * 64 Samples have passed. We are back at '0'. Copy use the

+		 * full sample count as index which is 0 64 128 or 192 and back

+	         * to 0. Our Output is only 128 big so we only look at the

+		 * 7 LSB.

+		 */

+		par {

+			audio_in_ptr = &pcm_audio_in[sample_count];

+			audio_out_ptr = &pcm_audio_out[(sample_count <- 7)];

+		}

+	}

+} /* --- main() --- */