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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MEDIA_SOURCE_H_
#define MEDIA_SOURCE_H_
#include <sys/types.h>
#include <media/stagefright/MediaErrors.h>
#include <utils/RefBase.h>
#include <utils/Vector.h>
namespace android {
class MediaBuffer;
class MetaData;
struct MediaSource : public virtual RefBase {
MediaSource();
// To be called before any other methods on this object, except
// getFormat().
virtual status_t start(MetaData *params = NULL) = 0;
// Any blocking read call returns immediately with a result of NO_INIT.
// It is an error to call any methods other than start after this call
// returns. Any buffers the object may be holding onto at the time of
// the stop() call are released.
// Also, it is imperative that any buffers output by this object and
// held onto by callers be released before a call to stop() !!!
virtual status_t stop() = 0;
// Returns the format of the data output by this media source.
virtual sp<MetaData> getFormat() = 0;
struct ReadOptions;
// Returns a new buffer of data. Call blocks until a
// buffer is available, an error is encountered of the end of the stream
// is reached.
// End of stream is signalled by a result of ERROR_END_OF_STREAM.
// A result of INFO_FORMAT_CHANGED indicates that the format of this
// MediaSource has changed mid-stream, the client can continue reading
// but should be prepared for buffers of the new configuration.
virtual status_t read(
MediaBuffer **buffer, const ReadOptions *options = NULL) = 0;
// Options that modify read() behaviour. The default is to
// a) not request a seek
// b) not be late, i.e. lateness_us = 0
struct ReadOptions {
enum SeekMode {
SEEK_PREVIOUS_SYNC,
SEEK_NEXT_SYNC,
SEEK_CLOSEST_SYNC,
SEEK_CLOSEST,
};
ReadOptions();
// Reset everything back to defaults.
void reset();
void setSeekTo(int64_t time_us, SeekMode mode = SEEK_CLOSEST_SYNC);
void clearSeekTo();
bool getSeekTo(int64_t *time_us, SeekMode *mode) const;
void setLateBy(int64_t lateness_us);
int64_t getLateBy() const;
void setNonBlocking();
void clearNonBlocking();
bool getNonBlocking() const;
private:
enum Options {
kSeekTo_Option = 1,
};
uint32_t mOptions;
int64_t mSeekTimeUs;
SeekMode mSeekMode;
int64_t mLatenessUs;
bool mNonBlocking;
};
// Causes this source to suspend pulling data from its upstream source
// until a subsequent read-with-seek. Currently only supported by
// OMXCodec.
virtual status_t pause() {
return ERROR_UNSUPPORTED;
}
// The consumer of this media source requests that the given buffers
// are to be returned exclusively in response to read calls.
// This will be called after a successful start() and before the
// first read() call.
// Callee assumes ownership of the buffers if no error is returned.
virtual status_t setBuffers(const Vector<MediaBuffer *> & /* buffers */) {
return ERROR_UNSUPPORTED;
}
protected:
virtual ~MediaSource();
private:
MediaSource(const MediaSource &);
MediaSource &operator=(const MediaSource &);
};
} // namespace android
#endif // MEDIA_SOURCE_H_
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