Add some utility for wav files.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@5076 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/algo/wav.h b/bertos/algo/wav.h
new file mode 100644 (file)
index 0000000..4cd0e31
--- /dev/null
+++ b/bertos/algo/wav.h
@@ -0,0 +1,127 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2011 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief WAV audio utils.
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ * $WIZ$ module_name = "wav"
+ */
+
+#ifndef  ALGO_WAV_H
+#define  ALGO_WAV_H
+
+#include <cfg/debug.h>
+
+#include <cpu/types.h>
+#include <cpu/byteorder.h>
+
+#include <string.h>
+
+typedef struct WavHdr
+{
+       char chunk_id[4];
+       uint32_t chunk_size;
+       char format[4];
+
+       char subchunk1_id[4];
+       uint32_t subchunk1_size;
+       uint16_t audio_format;
+       uint16_t num_channels;
+       uint32_t sample_rate;
+       uint32_t byte_rate;
+       uint16_t block_align;
+       uint16_t bits_per_sample;
+
+       uint8_t subchunk2[8];
+} WavHdr;
+
+INLINE int wav_checkHdr(WavHdr *wav, uint16_t audio_format, uint16_t num_channels, uint16_t sample_rate, uint16_t bits_per_sample)
+{
+       ASSERT(wav);
+
+       if (strncmp(wav->chunk_id, "RIFF", 4))
+       {
+               kputs("RIFF tag not found\n");
+               goto error;
+       }
+
+       if (strncmp(wav->format, "WAVE", 4))
+       {
+               kputs("WAVE tag not found\n");
+               goto error;
+       }
+
+       if (le16_to_cpu(wav->audio_format) != audio_format)
+       {
+               kprintf("Audio format not valid, found [%d]\n", le16_to_cpu(wav->audio_format));
+               goto error;
+       }
+
+       if (le16_to_cpu(wav->num_channels) != num_channels)
+       {
+               kprintf("Channels number not valid, found [%d]\n", le16_to_cpu(wav->num_channels));
+               goto error;
+       }
+
+
+       if (le32_to_cpu(wav->sample_rate) != sample_rate)
+       {
+               kprintf("Sample rate not valid, found [%ld]\n", le32_to_cpu(wav->sample_rate));
+               goto error;
+       }
+
+       if (le16_to_cpu(wav->bits_per_sample) != bits_per_sample)
+       {
+               kprintf("Bits per sample not valid, found [%d]\n", le16_to_cpu(wav->bits_per_sample));
+               goto error;
+       }
+       return 0;
+
+error:
+       return -1;
+}
+
+
+INLINE void wav_writeHdr(WavHdr *wav, uint16_t audio_format, uint16_t num_channels, uint16_t sample_rate, uint16_t bits_per_sample)
+{
+       ASSERT(wav);
+
+       memcpy(&wav->chunk_id, "RIFF", 4);
+       memcpy(&wav->format, "WAVE", 4);
+       wav->audio_format = cpu_to_le16(audio_format);
+       wav->num_channels = cpu_to_le16(num_channels);
+       wav->sample_rate = cpu_to_le16(sample_rate);
+       wav->bits_per_sample = cpu_to_le16(bits_per_sample);
+}
+
+#endif /* ALGO_WAV_H */