2 * Copyright (C) 2009 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef MEDIA_SOURCE_H_
19 #define MEDIA_SOURCE_H_
21 #include <sys/types.h>
23 #include <media/stagefright/MediaErrors.h>
24 #include <utils/RefBase.h>
31 struct MediaSource : public RefBase {
34 // To be called before any other methods on this object, except
36 virtual status_t start(MetaData *params = NULL) = 0;
38 // Any blocking read call returns immediately with a result of NO_INIT.
39 // It is an error to call any methods other than start after this call
40 // returns. Any buffers the object may be holding onto at the time of
41 // the stop() call are released.
42 // Also, it is imperative that any buffers output by this object and
43 // held onto by callers be released before a call to stop() !!!
44 virtual status_t stop() = 0;
46 // Returns the format of the data output by this media source.
47 virtual sp<MetaData> getFormat() = 0;
51 // Returns a new buffer of data. Call blocks until a
52 // buffer is available, an error is encountered of the end of the stream
54 // End of stream is signalled by a result of ERROR_END_OF_STREAM.
55 // A result of INFO_FORMAT_CHANGED indicates that the format of this
56 // MediaSource has changed mid-stream, the client can continue reading
57 // but should be prepared for buffers of the new configuration.
58 virtual status_t read(
59 MediaBuffer **buffer, const ReadOptions *options = NULL) = 0;
61 // Options that modify read() behaviour. The default is to
62 // a) not request a seek
63 // b) not be late, i.e. lateness_us = 0
74 // Reset everything back to defaults.
77 void setSeekTo(int64_t time_us, SeekMode mode = SEEK_CLOSEST_SYNC);
79 bool getSeekTo(int64_t *time_us, SeekMode *mode) const;
81 // Option allows encoder to skip some frames until the specified
83 // To prevent from being abused, when the skipFrame timestamp is
84 // found to be more than 1 second later than the current timestamp,
85 // an error will be returned from read().
86 void clearSkipFrame();
87 bool getSkipFrame(int64_t *timeUs) const;
88 void setSkipFrame(int64_t timeUs);
90 void setLateBy(int64_t lateness_us);
91 int64_t getLateBy() const;
97 kSkipFrame_Option = 2,
105 int64_t mSkipFrameUntilTimeUs;
108 // Causes this source to suspend pulling data from its upstream source
109 // until a subsequent read-with-seek. Currently only supported by
111 virtual status_t pause() {
112 return ERROR_UNSUPPORTED;
116 virtual ~MediaSource();
119 MediaSource(const MediaSource &);
120 MediaSource &operator=(const MediaSource &);
123 } // namespace android
125 #endif // MEDIA_SOURCE_H_