In case others come across this and want to see what the actual code is in this solution, I'm posting my code here. I'm using my Android device to stream a video file from the SD card for a Chromecast request. Using this code, I'm able to start the stream in the middle and/or seek to a specific location in the stream.
@Override
@SuppressWarnings("deprecation")
public Response serve(String uri, Method method, Map<String, String> headers, Map<String, String> params, Map<String, String> files) {
String mimeType = getMimeType();
String currentUri = getCurrentUri();
if (currentUri != null && currentUri.equals(uri)) {
String range = null;
Log.d(TAG, "Request headers:");
for (String key : headers.keySet()) {
Log.d(TAG, " " + key + ":" + headers.get(key));
if ("range".equals(key)) {
range = headers.get(key);
}
}
try {
if (range == null) {
return getFullResponse(mimeType);
} else {
return getPartialResponse(mimeType, range);
}
} catch (IOException e) {
Log.e(TAG, "Exception serving file: " + filePath, e);
}
} else {
Log.d(TAG, "Not serving request for: " + uri);
}
return new Response(Response.Status.NOT_FOUND, mimeType, "File not found");
}
private Response getFullResponse(String mimeType) throws FileNotFoundException {
cleanupStreams();
fileInputStream = new FileInputStream(filePath);
return new Response(Response.Status.OK, mimeType, fileInputStream);
}
private Response getPartialResponse(String mimeType, String rangeHeader) throws IOException {
File file = new File(filePath);
String rangeValue = rangeHeader.trim().substring("bytes=".length());
long fileLength = file.length();
long start, end;
if (rangeValue.startsWith("-")) {
end = fileLength - 1;
start = fileLength - 1
- Long.parseLong(rangeValue.substring("-".length()));
} else {
String[] range = rangeValue.split("-");
start = Long.parseLong(range[0]);
end = range.length > 1 ? Long.parseLong(range[1])
: fileLength - 1;
}
if (end > fileLength - 1) {
end = fileLength - 1;
}
if (start <= end) {
long contentLength = end - start + 1;
cleanupStreams();
fileInputStream = new FileInputStream(file);
//noinspection ResultOfMethodCallIgnored
fileInputStream.skip(start);
Response response = new Response(Response.Status.PARTIAL_CONTENT, mimeType, fileInputStream);
response.addHeader("Content-Length", contentLength + "");
response.addHeader("Content-Range", "bytes " + start + "-" + end + "/" + fileLength);
response.addHeader("Content-Type", mimeType);
return response;
} else {
return new Response(Response.Status.RANGE_NOT_SATISFIABLE, HTML_MIME_TYPE, rangeHeader);
}
}
