From 6b7c665baaf6023ee1cd935a953711fe65fff73b Mon Sep 17 00:00:00 2001
From: Jon Bergli Heier <snakebite@jvnv.net>
Date: Tue, 28 Dec 2010 02:20:11 +0100
Subject: Added mpg123 decoder.

---
 SConstruct                  |  4 +++-
 decoder.h                   | 11 ++++++++++
 decoders/mpg123_decoder.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++++
 decoders/mpg123_decoder.h   | 18 ++++++++++++++++
 4 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 decoder.h
 create mode 100644 decoders/mpg123_decoder.cpp
 create mode 100644 decoders/mpg123_decoder.h

diff --git a/SConstruct b/SConstruct
index 07e2a04..f29694c 100644
--- a/SConstruct
+++ b/SConstruct
@@ -13,6 +13,8 @@ if GetOption('release'):
 else:
 	env.Append(CCFLAGS = ['-Wall', '-g'])
 
-env.Program('audistd', Glob('*.cpp'))
+env.ParseConfig('pkg-config --cflags --libs libmpg123')
+
+env.Program('audistd', Glob('*.cpp') + Glob('decoders/*.cpp'))
 
 # vim: syn=python
diff --git a/decoder.h b/decoder.h
new file mode 100644
index 0000000..7e76088
--- /dev/null
+++ b/decoder.h
@@ -0,0 +1,11 @@
+#ifndef DECODER_H
+#define DECODER_H
+
+#include <boost/cstdint.hpp>
+
+class DecoderBase {
+	public:
+		virtual size_t decode(const uint8_t *input, size_t input_size, uint8_t *output, size_t output_size) = 0;
+};
+
+#endif
diff --git a/decoders/mpg123_decoder.cpp b/decoders/mpg123_decoder.cpp
new file mode 100644
index 0000000..41aef40
--- /dev/null
+++ b/decoders/mpg123_decoder.cpp
@@ -0,0 +1,52 @@
+#include "mpg123_decoder.h"
+
+#include <boost/format.hpp>
+
+#include <iostream>
+#include <stdexcept>
+
+DecoderMpg123::DecoderMpg123() {
+	mpg123_init();
+
+	int error;
+	handle = mpg123_new("generic", &error);
+	if(error) {
+		throw std::runtime_error(mpg123_plain_strerror(error));
+	}
+
+	error = mpg123_open_feed(handle);
+	if(error) {
+		throw std::runtime_error(mpg123_plain_strerror(error));
+	}
+
+	mpg123_format_none(handle);
+	mpg123_format(handle, 44100, 2, MPG123_ENC_SIGNED_16);
+}
+
+DecoderMpg123::~DecoderMpg123() {
+	mpg123_close(handle);
+	mpg123_delete(handle);
+}
+
+size_t DecoderMpg123::decode(const uint8_t *input, size_t input_size, uint8_t *output, size_t output_size) {
+	if(mpg123_feed(handle, input, input_size) != MPG123_OK) {
+		throw std::runtime_error(mpg123_strerror(handle));
+	}
+
+	size_t output_written;
+	int error = mpg123_read(handle, output, output_size, &output_written);
+
+	if(error == MPG123_NEW_FORMAT) {
+		long rate;
+		int channels, enc;
+		mpg123_getformat(handle, &rate, &channels, &enc);
+		std::cout << boost::format("mpg123: New format: %li Hz, %i channels, encoding value %i") % rate % channels % enc << std::endl;
+		error = mpg123_read(handle, output, output_size, &output_written);
+	}
+
+	if(error != MPG123_OK && error != MPG123_DONE && error != MPG123_NEED_MORE) {
+		throw std::runtime_error(mpg123_plain_strerror(error));
+	}
+
+	return output_written;
+}
diff --git a/decoders/mpg123_decoder.h b/decoders/mpg123_decoder.h
new file mode 100644
index 0000000..46f9e4c
--- /dev/null
+++ b/decoders/mpg123_decoder.h
@@ -0,0 +1,18 @@
+#ifndef DECODER_MPG123_H
+#define DECODER_MPG123_H
+
+#include "decoder.h"
+
+#include <mpg123.h>
+
+class DecoderMpg123 : public DecoderBase {
+	private:
+		mpg123_handle *handle;
+
+	public:
+		DecoderMpg123();
+		~DecoderMpg123();
+		size_t decode(const uint8_t *input, size_t input_size, uint8_t *output, size_t output_size);
+};
+
+#endif
-- 
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