You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

166 lines
5.1 KiB

/*
* Copyright (C) 2018 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_BASE_H_
#define MEDIA_SOURCE_BASE_H_
#include <sys/types.h>
#include <binder/IMemory.h>
#include <binder/MemoryDealer.h>
#include <media/MediaExtractorPluginApi.h>
#include <media/stagefright/MediaBufferGroup.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MetaData.h>
#include <media/MediaExtractorPluginApi.h>
#include <utils/Log.h>
#include <utils/RefBase.h>
#include <utils/Vector.h>
namespace android {
class MediaBufferBase;
struct CMediaTrack;
class SourceBaseAllocTracker {
public:
SourceBaseAllocTracker() {
ALOGD("sourcebase allocated: %p", this);
}
virtual ~SourceBaseAllocTracker() {
ALOGD("sourcebase freed: %p", this);
}
};
struct MediaTrack
// : public SourceBaseAllocTracker
{
MediaTrack();
// To be called before any other methods on this object, except
// getFormat().
virtual status_t start() = 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 track.
virtual status_t getFormat(MetaDataBase& format) = 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 : int32_t {
SEEK_PREVIOUS_SYNC = CMediaTrackReadOptions::SEEK_PREVIOUS_SYNC,
SEEK_NEXT_SYNC = CMediaTrackReadOptions::SEEK_NEXT_SYNC,
SEEK_CLOSEST_SYNC = CMediaTrackReadOptions::SEEK_CLOSEST_SYNC,
SEEK_CLOSEST = CMediaTrackReadOptions::SEEK_CLOSEST,
SEEK_FRAME_INDEX = CMediaTrackReadOptions::SEEK_FRAME_INDEX,
};
ReadOptions() {
reset();
}
// Reset everything back to defaults.
void reset() {
mOptions = 0;
mSeekTimeUs = 0;
mNonBlocking = false;
}
void setSeekTo(int64_t time_us, SeekMode mode = SEEK_CLOSEST_SYNC);
void clearSeekTo() {
mOptions &= ~kSeekTo_Option;
mSeekTimeUs = 0;
mSeekMode = SEEK_CLOSEST_SYNC;
}
bool getSeekTo(int64_t *time_us, SeekMode *mode) const;
void setNonBlocking();
void clearNonBlocking();
bool getNonBlocking() const;
// Used to clear all non-persistent options for multiple buffer reads.
void clearNonPersistent() {
clearSeekTo();
}
private:
enum Options {
kSeekTo_Option = 1,
};
uint32_t mOptions;
int64_t mSeekTimeUs;
SeekMode mSeekMode;
bool mNonBlocking;
} __attribute__((packed)); // sent through Binder
// 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(
MediaBufferBase **buffer, const ReadOptions *options = NULL) = 0;
// Returns true if |read| supports nonblocking option, otherwise false.
// |readMultiple| if supported, always allows the nonblocking option.
virtual bool supportNonblockingRead() {
return false;
}
virtual ~MediaTrack();
private:
MediaTrack(const MediaTrack &);
MediaTrack &operator=(const MediaTrack &);
};
class MediaTrackCUnwrapper : public MediaTrack {
public:
static MediaTrackCUnwrapper *create(CMediaTrack *wrapper);
virtual status_t start();
virtual status_t stop();
virtual status_t getFormat(MetaDataBase& format);
virtual status_t read(MediaBufferBase **buffer, const ReadOptions *options = NULL);
virtual bool supportNonblockingRead();
protected:
virtual ~MediaTrackCUnwrapper();
private:
explicit MediaTrackCUnwrapper(CMediaTrack *wrapper);
CMediaTrack *wrapper;
MediaBufferGroup *bufferGroup;
};
} // namespace android
#endif // MEDIA_SOURCE_BASE_H_