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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_BASE_DATA_SOURCE_H_
- #define MEDIA_BASE_DATA_SOURCE_H_
- #include <stdint.h>
- #include "base/callback_forward.h"
- #include "media/base/media_export.h"
- namespace media {
- class MEDIA_EXPORT DataSource {
- public:
- using ReadCB = base::OnceCallback<void(int)>;
- enum { kReadError = -1, kAborted = -2 };
- DataSource();
- DataSource(const DataSource&) = delete;
- DataSource& operator=(const DataSource&) = delete;
- virtual ~DataSource();
- // Reads |size| bytes from |position| into |data|. And when the read is done
- // or failed, |read_cb| is called with the number of bytes read or
- // kReadError in case of error.
- virtual void Read(int64_t position,
- int size,
- uint8_t* data,
- DataSource::ReadCB read_cb) = 0;
- // Stops the DataSource. Once this is called all future Read() calls will
- // return an error. This is a synchronous call and may be called from any
- // thread. Once called, the DataSource may no longer be used and should be
- // destructed shortly thereafter.
- virtual void Stop() = 0;
- // Similar to Stop(), but only aborts current reads and not future reads.
- virtual void Abort() = 0;
- // Returns true and the file size, false if the file size could not be
- // retrieved.
- [[nodiscard]] virtual bool GetSize(int64_t* size_out) = 0;
- // Returns true if we are performing streaming. In this case seeking is
- // not possible.
- virtual bool IsStreaming() = 0;
- // Notify the DataSource of the bitrate of the media.
- // Values of |bitrate| <= 0 are invalid and should be ignored.
- virtual void SetBitrate(int bitrate) = 0;
- // Assume fully bufferred by default.
- virtual bool AssumeFullyBuffered() const;
- // By default this just returns GetSize().
- virtual int64_t GetMemoryUsage();
- };
- } // namespace media
- #endif // MEDIA_BASE_DATA_SOURCE_H_
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