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78 lines
3 KiB
C
78 lines
3 KiB
C
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#pragma once
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#include "PlaybackBase.h"
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#include "foundation/error.h"
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#include "service/api_service.h"
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/* this one does most of the work for you.
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It assumes blocking I/O and, generally, a simple implementation
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You provide an implementation of PlaybackImpl */
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class PlaybackBase2;
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class PlaybackImpl
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{
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public:
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void Connect(PlaybackBase2 *playback, ifc_playback_parameters *playback_parameters);
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/* stuff you need to implement */
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/* destructor. be diligent about closing stuff, can't guarantee that Close() got called beforehand */
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virtual ~PlaybackImpl();
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virtual ns_error_t Open(nx_uri_t filename)=0;
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/* you need to handle the possibility that Close gets called more than one time */
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virtual void Close()=0;
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virtual bool IsSeekable()=0;
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/* implementation note: add a reference (Retain) before assigning the value */
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virtual ns_error_t GetMetadata(ifc_metadata **metadata)=0;
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/* if you set *exact=false, GetLength will get called after the next DecodeStep */
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virtual ns_error_t GetLength(double *length, bool *exact)=0;
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/* only return an error if you're in a state you can't recover from.
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if you can't seek, then just don't seek and return NErr_Success */
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virtual ns_error_t Seek(const Agave_Seek *seek, ns_error_t *seek_error, double *new_position)=0;
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/* return NErr_Success to continue
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NErr_EndOfFile to indicate a natural end of file
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otherwise return an error */
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virtual ns_error_t DecodeStep()=0;
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/* Save information and close the OS file handle.
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fill resume_information with whatever information you'll need to resume */
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virtual ns_error_t Interrupt(Agave_Seek *resume_information)=0;
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/* During resume, be sure to call player->SetMetadata again */
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virtual ns_error_t Resume(Agave_Seek *resume_information)=0;
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protected:
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PlaybackBase2 *playback;
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ifc_playback_parameters *playback_parameters;
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PlaybackImpl();
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};
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class PlaybackBase2 : public PlaybackBase
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{
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public:
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PlaybackBase2();
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~PlaybackBase2();
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ns_error_t Initialize(api_service *service_manager, PlaybackImpl *implementation, nx_uri_t filename, ifc_player *player);
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/* this two should ONLY be called from within your DecodeStep function! */
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ns_error_t OpenOutput(const ifc_audioout::Parameters *parameters); // if this returns an error, return it from DecodeStep()
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ns_error_t Output(const void *audio_data, size_t audio_data_length, double begin_position_seconds); // if this returns an error, return it from DecodeStep()
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ns_error_t OutputNonInterleaved(const void *audio_data, size_t audio_data_length, double begin_position_seconds); // if this returns an error, return it from DecodeStep()
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private:
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static nx_thread_return_t NXTHREADCALL PlayerThreadFunction(nx_thread_parameter_t param);
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nx_thread_return_t NXTHREADCALL DecodeLoop();
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ns_error_t Init();
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ns_error_t WaitForClose();
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ns_error_t OutputWait();
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ns_error_t Internal_Interrupt();
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PlaybackImpl *implementation;
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api_filelock *filelocker;
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ifc_audioout *out;
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bool paused;
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double last_position;
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bool exact_length;
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ifc_audioout::Parameters parameters;
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const uint8_t **output_pointers;
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};
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