bar code generator in c# An Example in Objective-C

Generator Data Matrix ECC200 in Objective-C An Example

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Create the Player as shown above, but use the rtsp scheme, as in "rtsp://myserver.com/streams/live.m4a".
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What should you do if you want to stream, but you are running on an older version of BlackBerry device software You could switch to a download, update the phone, or write your own streaming client implementation. This requires an investment in time and effort, but it allows you to have streaming capabilities even when the device doesn t support it.
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In the previous chapter, we discussed how DataSource objects handle the data delivery protocol. When you use a URL that starts with http://, file:///, or rtsp://, the Manager is automatically creating an appropriate DataSource for that type of protocol. However, you can implement your own version of DataSource and SourceStream to provide whatever functionality you wanted, including support for streaming. Define this DataSource, then pass it to Manager.createPlayer(). The Manager will then obtain the necessary data from the DataSource s provided streams, as shown in Figure 3-1. Note that you will now be responsible for all the complexity of streaming. You will likely need to experiment and tune your DataSource s behavior to get the best results on different devices.
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CHAPTER 3: Media Playback
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Figure 3-1. A Player with a user-defined data source
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Pros: Compatibility. Your DataSource can run on any BlackBerry device that supports media playback and network connections. Control. You will gain a far greater level of control over media playback, beyond what is provided by the standard MMAPI behavior. For example, you could automatically shut off playback when the user s time expires. Cons: Complexity. Creating a DataSource is fairly tricky, and it requires tuning to get the best performance. Coordination. If using a custom protocol, you will need to make sure that the server is set up to provide data in the format you expect.
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CHAPTER 3: Media Playback
An Example
This skeleton class shows a DataSource implementation that could be used to create a streaming Player.
public class StreamingDataSource extends DataSource { public StreamingDataSource(String locator) { super(locator); } public void connect() throws IOException { // Connect to the locator and create the stream(s). } public void disconnect() { // Close the stream(s). } public String getContentType() { // Return content type of underlying stream. return null; } public SourceStream[] getStreams() { // Return stream(s) created in connect() return null; } public void start() throws IOException { // Start acquiring content with the stream(s). } public void stop() throws IOException { // Stop acquiring content. } public Control getControl(String controlType) { // Can return null unless adding custom controls. return null; } public Control[] getControls() { // Can return null unless adding custom controls.
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CHAPTER 3: Media Playback
return null; } }
The associated SourceStream will do most of the actual work. A skeleton example follows. An implementing class will generally reuse one or more existing InputStream objects, adding any extra logic that is necessary.
public class StreamingSourceStream implements SourceStream { public ContentDescriptor getContentDescriptor() { // Returns descriptor for content being retrieved. return null; } public long getContentLength() { // Returns total amount of data to read. return 0; } public int getSeekType() { // Return one of NOT_SEEKABLE, RANDOM_SEEKABLE, or SEEKABLE_TO_START. return 0; } public int getTransferSize() { // Return size of a logical chunk to read. // Useful to influence the size of requested reads. return 0; } public int read(byte[] dataOut, int offset, int length) throws IOException { // Retrieve actual data. Can block until sufficient data available. return 0; } public long seek(long position) throws IOException { // Advance stream to desired position, if supported. return 0; } public long tell() { // Return current position within the stream. return 0; } public Control getControl(String controlType)
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CHAPTER 3: Media Playback
{ // Can return null unless adding custom controls. return null; } public Control[] getControls() { // Can return null unless adding custom controls. return null; } }
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