Added mpg123 decoder.

2 files changed, 70 insertions, 0 deletions

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