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/*
* Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
* Copyright (c) 2012, 2013, Andrew Hannam aka inmarket
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* This demo demonstrates the use of the GAUDOUT module to play a wave file.
*
*/
#include "gfx.h"
/* Specify our timing parameters */
#define MY_AUDIO_CHANNEL 0 /* Use channel 0 */
#define MY_AUDIO_CHANNEL_IS_STEREO GAUDOUT_CHANNEL0_IS_STEREO /* Is it stereo? */
// Storage for the wave header
static char whdr[32];
/*
* Application entry point.
*/
int main(void) {
font_t font;
GFILE *f;
char *errmsg;
uint32_t toplay;
uint32_t frequency;
ArrayDataFormat datafmt;
uint32_t len;
GDataBuffer *pd;
// Initialise everything
gfxInit();
errmsg = 0;
// Any font will do
font = gdispOpenFont("*");
// Allocate audio buffers - 4 x 512 byte buffers.
// You may need to increase this for slower cpu's.
// You may be able to decrease this for low latency operating systems.
if (!gfxBufferAlloc(4, 512)) {
errmsg = "Err: No Memory";
goto theend;
}
repeatplay:
// Open the wave file
if (!(f = gfileOpen("allwrong.wav", "r"))) {
errmsg = "Err: Open WAV";
goto theend;
}
// Read the wave header
if (gfileRead(f, whdr, 20) != 20) {
errmsg = "Err: Read hdr";
goto theend;
}
// Check the wave header
if (whdr[0] != 'R' || whdr[1] != 'I' || whdr[2] != 'F' || whdr[3] != 'F' // RIFF label
|| whdr[8] != 'W' || whdr[9] != 'A' || whdr[10] != 'V' || whdr[11] != 'E' // WAVE label
|| whdr[12] != 'f' || whdr[13] != 'm' || whdr[14] != 't' || whdr[15] != ' ' // fmt label
) {
errmsg = "Err: Bad header";
goto theend;
}
// Read the fmt block
len = (((uint32_t)(uint8_t)whdr[16])<<0) | (((uint32_t)(uint8_t)whdr[17])<<8)
| (((uint32_t)(uint8_t)whdr[18])<<16) | (((uint32_t)(uint8_t)whdr[19])<<24);
if (len > sizeof(whdr) || len < 16) {
errmsg = "Err: Bad fmt len";
goto theend;
}
if (gfileRead(f, whdr, len) != len) {
errmsg = "Err: Read fmt block";
goto theend;
}
if (whdr[0] != 1 || whdr[1] != 0 // PCM format
|| (whdr[14] != 8 && whdr[14] != 16) || whdr[15] != 0 // 8 or 16 bits per sample
) {
errmsg = "Err: Bad fmt block";
goto theend;
}
// Check stereo/mono
#if MY_AUDIO_CHANNEL_IS_STEREO
if (whdr[2] != 2 || whdr[3] != 0) {
errmsg = "Err: Not stereo";
goto theend;
}
#else
if (whdr[2] != 1 || whdr[3] != 0) {
errmsg = "Err: Not mono";
goto theend;
}
#endif
// Get the sample frequency (little endian format) and format
frequency = (((uint32_t)(uint8_t)whdr[4])<<0) | (((uint32_t)(uint8_t)whdr[5])<<8)
| (((uint32_t)(uint8_t)whdr[6])<<16) | (((uint32_t)(uint8_t)whdr[7])<<24);
datafmt = whdr[14] == 8 ? ARRAY_DATA_8BITUNSIGNED : ARRAY_DATA_16BITSIGNED;
// Initialise the audio output device
if (!gaudioPlayInit(MY_AUDIO_CHANNEL, frequency, datafmt)) {
// For this demo we don't try and do any format conversions if the driver won't accept
// what we initially request.
errmsg = "Err: Bad format/freq";
goto theend;
}
// Get our current file position
len += 20;
// Read RIFF blocks until we get to the data RIFF block (contains the audio)
while(TRUE) {
if (gfileRead(f, whdr, 8) != 8) {
errmsg = "Err: Read block";
goto theend;
}
// Get the block length (little endian format)
toplay = (((uint32_t)(uint8_t)whdr[4])<<0) | (((uint32_t)(uint8_t)whdr[5])<<8)
| (((uint32_t)(uint8_t)whdr[6])<<16) | (((uint32_t)(uint8_t)whdr[7])<<24);
// Stop scanning when this is a data block
if (whdr[0] == 'd' && whdr[1] == 'a' && whdr[2] == 't' && whdr[3] == 'a')
break;
// Seek to the next block header
len += toplay + 8;
if (!gfileSetPos(f, len)) {
errmsg = "Err: No data";
goto theend;
}
}
// Play the file
gdispDrawString(0, gdispGetHeight()/2, "Playing...", font, GFX_YELLOW);
while(toplay) {
// Get a buffer to put the data into
pd = gfxBufferGet(TIME_INFINITE); // This should never fail as we are waiting forever
// How much data can we put in
len = toplay > pd->size ? pd->size : toplay;
pd->len = len;
toplay -= len;
// Read the data
if (gfileRead(f, pd+1, len) != len) {
errmsg = "Err: Read fail";
goto theend;
}
gaudioPlay(pd);
}
gfileClose(f);
// Wait for the play to finish
gaudioPlayWait(TIME_INFINITE);
gdispDrawString(0, gdispGetHeight()/2+10, "Done", font, GFX_GREEN);
// Repeat the whole thing
gfxSleepMilliseconds(1500);
gdispClear(GFX_BLACK);
goto repeatplay;
// The end
theend:
if (errmsg)
gdispDrawString(0, gdispGetHeight()/2, errmsg, font, GFX_RED);
while(TRUE)
gfxSleepMilliseconds(1000);
}
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