Streaming MMS Audio with Libmms and FFmpeg: A Comprehensive Guide

Introduction to Libmms Functions for Streaming MMS Audio

Libmms is a C library that provides an interface to the Microsoft Media Server (MMS) protocol. It allows developers to stream audio and video content from an MMS server to various platforms, including iOS devices using FFmpeg. In this article, we will explore how to use Libmms functions to stream mms audio.

Prerequisites

To use Libmms with FFmpeg, you need to have both libraries installed on your system. The installation process may vary depending on your operating system and Xcode project setup.

Installing Libmms

On macOS, you can install Libmms using Homebrew:

# Install Homebrew if not already installed
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

# Install libmms using Homebrew
brew install mms

Installing FFmpeg

On macOS, you can install FFmpeg using FFmpeg’s official installer:

# Download and install the latest version of FFmpeg
wget https://ffmpeg.org/releases/ffmpeg-4.3.tar.bz2
tar -jvf ffmpeg-4.3.tar.bz2
cd ffmpeg-4.3
./configure --enable-gpl --enable-libx264 --enable-libmp3lame --enable-x11
make
sudo make install

Understanding the Libmms Functions

The Libmms library provides an interface to the MMS protocol, allowing you to connect to an MMS server and stream audio content. The mms_connect() function is used to establish a connection with the MMS server.

mms_connect() Function

The mms_connect() function takes six arguments:

connection: a pointer to the MMS connection structure
server_url: a null-terminated string containing the URL of the MMS server
tcUrl: a null-terminated string containing the transcoding URL
hostname: a null-terminated string containing the hostname of the MMS server
playpath: a null-terminated string containing the playpath of the audio content
port: an integer representing the port number to use for the connection

mms_connect(NULL, NULL, g_tcUrl.av_val, g_hostname.av_val, g_playpath.av_val, "", g_port, 128*1024)

In this example, the mms_connect() function is used to establish a connection with an MMS server. The g_tcUrl, g_hostname, and g_playpath variables are initialized with null-terminated strings containing the transcoding URL, hostname, and playpath, respectively.

Initializing Variables

To use the mms_connect() function, you need to initialize variables for the transcoding URL, hostname, playpath, and port.

Initializing Transcoding URL

The transcoding URL is used to specify the audio format and bitrate for streaming. You can initialize the transcoding URL variable using a null-terminated string:

strTemp = @"mms://123.30.49.85/htv2";
g_tcUrl.av_val = new char[[strTemp length] + 1];
[strTemp getCString:g_tcUrl.av_val maxLength:([strTemp length]+1) encoding:NSUTF8StringEncoding]
g.tcUrl.av_len = strlen(g.tcUrl.av_val);

In this example, the transcoding URL is initialized with a null-terminated string containing the mms:// scheme and the hostname.

Initializing Hostname

The hostname is used to identify the MMS server. You can initialize the hostname variable using a null-terminated string:

strTemp = @"123.30.49.85";
g_hostname.av_val = new char[[strTemp length]+1];
[strTemp getCString:g_hostname.av_val maxLength:([strTemp length]+1) encoding:NSUTF8StringEncoding]
g.hostname.av_len = strlen(g_hostname.av_val);

In this example, the hostname is initialized with a null-terminated string containing the IP address of the MMS server.

Initializing Playpath

The playpath specifies the location of the audio content on the MMS server. You can initialize the playpath variable using a null-terminated string:

strTemp = @"/htv2";
g_playpath.av_val = new char[[strTemp length] + 1];
[strTemp getCString:g_playpath.av_val maxLength:([strTemp length]+1) encoding:NSUTF8StringEncoding]
g.playpath.av_len = strlen(g_playpath.av_val);

In this example, the playpath is initialized with a null-terminated string containing the / character and the filename.

Initializing Port

The port number specifies the connection port to use for streaming. You can initialize the port variable using an integer:

g_port = 1755;

In this example, the port number is set to 1755.

Streaming MMS Audio with Libmms and FFmpeg

To stream mms audio using Libmms and FFmpeg, you need to establish a connection with the MMS server and use FFmpeg’s streaming functionality.

Establishing Connection

Establish a connection with the MMS server using the mms_connect() function:

mms_connect(NULL, NULL, g_tcUrl.av_val, g_hostname.av_val, g_playpath.av_val, "", g_port, 128*1024);

In this example, the mms_connect() function is used to establish a connection with an MMS server.

Streaming Audio

Use FFmpeg’s streaming functionality to stream the audio content:

ffmpeg -i pipe: -f mpegts http://localhost:1755/htv2.m3u8

In this example, the ffmpeg command is used to stream the audio content from a pipe to an MMS server.

Conclusion

In this article, we explored how to use Libmms functions to stream mms audio. We discussed the prerequisites for using Libmms with FFmpeg, including installing both libraries on your system. We also examined the mms_connect() function and its usage in establishing a connection with an MMS server. Finally, we demonstrated how to stream audio content using FFmpeg’s streaming functionality.

Additional Resources

For more information about Libmms and FFmpeg, please visit the following resources:

Last modified on 2024-03-27