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// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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.
// Module Overview: Starboard Player module
//
// Defines an interface for controlling playback of media elementary streams.
#ifndef STARBOARD_PLAYER_H_
#define STARBOARD_PLAYER_H_
#include "starboard/configuration.h"
#include "starboard/decode_target.h"
#include "starboard/drm.h"
#include "starboard/export.h"
#include "starboard/media.h"
#include "starboard/types.h"
#include "starboard/window.h"
#ifdef __cplusplus
extern "C" {
#endif
// --- Types -----------------------------------------------------------------
// An indicator of whether the decoder can accept more samples.
typedef enum SbPlayerDecoderState {
// The decoder is asking for one more sample.
kSbPlayerDecoderStateNeedsData,
// The decoder is not ready for any more samples, so do not send them.
// Note that this enum value has been deprecated and the SbPlayer
// implementation should no longer use this value.
kSbPlayerDecoderStateBufferFull,
// The player has been destroyed, and will send no more callbacks.
kSbPlayerDecoderStateDestroyed,
} SbPlayerDecoderState;
// An indicator of the general playback state.
typedef enum SbPlayerState {
// The player has just been initialized. It is expecting an SbPlayerSeek()
// call to enter the prerolling state.
kSbPlayerStateInitialized,
// The player is prerolling, collecting enough data to fill the pipeline
// before presentation starts. After the first preroll is completed, there
// should always be a video frame to render, even if the player goes back to
// Prerolling after a Seek.
kSbPlayerStatePrerolling,
// The player is presenting media, and it is either paused or actively
// playing in real-time. Note that the implementation should use this
// state to signal that the preroll has been finished.
kSbPlayerStatePresenting,
// The player is presenting media, but it is paused at the end of the stream.
kSbPlayerStateEndOfStream,
// The player has been destroyed, and will send no more callbacks.
kSbPlayerStateDestroyed,
// The player encountered an error. It expects an SbPlayerDestroy() call
// to tear down the player. Calls to other functions may be ignored and
// callbacks may not be triggered.
kSbPlayerStateError,
} SbPlayerState;
typedef enum SbPlayerOutputMode {
// Requests for SbPlayer to produce an OpenGL texture that the client must
// draw every frame with its graphics rendering. It may be that we get a
// texture handle, but cannot perform operations like glReadPixels on it if it
// is DRM-protected, or it may not support DRM-protected content at all. When
// this output mode is provided to SbPlayerCreate(), the application will be
// able to pull frames via calls to SbPlayerGetCurrentFrame().
kSbPlayerOutputModeDecodeToTexture,
// Requests for SbPlayer to use a "punch-out" output mode, where video is
// rendered to the far background, and the graphics plane is automatically
// composited on top of the video by the platform. The client must punch an
// alpha hole out of the graphics plane for video to show through. In this
// case, changing the video bounds must be tightly synchronized between the
// player and the graphics plane.
kSbPlayerOutputModePunchOut,
// An invalid output mode.
kSbPlayerOutputModeInvalid,
} SbPlayerOutputMode;
// Information about the current media playback state.
typedef struct SbPlayerInfo {
// The position of the playback head, as precisely as possible, in 90KHz ticks
// (PTS).
SbMediaTime current_media_pts;
// The known duration of the currently playing media stream, in 90KHz ticks
// (PTS).
SbMediaTime duration_pts;
// The width of the currently displayed frame, in pixels, or 0 if not provided
// by this player.
int frame_width;
// The height of the currently displayed frame, in pixels, or 0 if not
// provided by this player.
int frame_height;
// Whether playback is currently paused.
bool is_paused;
// The current player volume in [0, 1].
double volume;
// The number of video frames sent to the player since the creation of the
// player.
int total_video_frames;
// The number of video frames decoded but not displayed since the creation of
// the player.
int dropped_video_frames;
// The number of video frames that failed to be decoded since the creation of
// the player.
int corrupted_video_frames;
// The rate of playback. The video is played back in a speed that is
// proportional to this. By default it is 1.0 which indicates that the
// playback is at normal speed. When it is greater than one, the video is
// played in a faster than normal speed. When it is less than one, the video
// is played in a slower than normal speed. Negative speeds are not
// supported.
double playback_rate;
} SbPlayerInfo;
// An opaque handle to an implementation-private structure representing a
// player.
typedef struct SbPlayerPrivate* SbPlayer;
// Callback for decoder status updates, called in response to a call to
// SbPlayerSeek() or SbPlayerWriteSample(). This callback will never be called
// until at least one call to SbPlayerSeek has occurred. |ticket| will be set to
// the ticket passed into the last received call to SbPlayerSeek() at the time
// this callback was dispatched. This is to distinguish status callbacks for
// interrupting seeks. These callbacks will happen on a different thread than
// the calling thread, and it is not valid to call SbPlayer functions from
// within this callback. After an update with kSbPlayerDecoderStateNeedsData,
// the user of the player will make at most one call to SbPlayerWriteSample() or
// SbPlayerWriteEndOfStream(). The player implementation should update the
// decoder status again after such call to notify its user to continue writing
// more frames.
typedef void (*SbPlayerDecoderStatusFunc)(SbPlayer player,
void* context,
SbMediaType type,
SbPlayerDecoderState state,
int ticket);
// Callback for player status updates. These callbacks will happen on a
// different thread than the calling thread, and it is not valid to call
// SbPlayer functions from within this callback.
typedef void (*SbPlayerStatusFunc)(SbPlayer player,
void* context,
SbPlayerState state,
int ticket);
// Callback to free the given sample buffer data. When more than one buffer
// are sent in SbPlayerWriteSample(), the implementation only has to call this
// callback with |sample_buffer| points to the the first buffer.
typedef void (*SbPlayerDeallocateSampleFunc)(SbPlayer player,
void* context,
const void* sample_buffer);
#if SB_HAS(PLAYER_WITH_URL)
// Callback to queue an encrypted event for initialization data
// encountered in media data. |init_data_type| should be a string
// matching one of the EME initialization data types : "cenc",
// "fairplay", "keyids", or "webm", |init_data| is the initialization
// data, and |init_data_length| is the length of the data.
typedef void (*SbPlayerEncryptedMediaInitDataEncounteredCB)(
SbPlayer player,
void* context,
const char* init_data_type,
const unsigned char* init_data,
unsigned int init_data_length);
#endif // SB_API_VERSION >= SB_PLAYER_WITH_URL_API_VERSION &&
// SB_HAS(PLAYER_WITH_URL)
// --- Constants -------------------------------------------------------------
// The value to pass into SbPlayerCreate's |duration_ptr| argument for cases
// where the duration is unknown, such as for live streams.
#define SB_PLAYER_NO_DURATION (-1)
// The value of the initial ticket held by the player before the first seek.
// The player will use this ticket value to make the first call to
// SbPlayerStatusFunc with kSbPlayerStateInitialized.
#define SB_PLAYER_INITIAL_TICKET (0)
// Well-defined value for an invalid player.
#define kSbPlayerInvalid ((SbPlayer)NULL)
// Returns whether the given player handle is valid.
static SB_C_INLINE bool SbPlayerIsValid(SbPlayer player) {
return player != kSbPlayerInvalid;
}
// --- Functions -------------------------------------------------------------
#if SB_HAS(PLAYER_WITH_URL)
// Creates a URL-based SbPlayer that will be displayed on |window| for
// the specified URL |url|, acquiring all resources needed to operate
// it, and returning an opaque handle to it. The expectation is that a
// new player will be created and destroyed for every playback.
//
// In many ways this function is similar to SbPlayerCreate, but it is
// missing the input arguments related to the configuration and format
// of the audio and video stream, as well as the DRM system. The DRM
// system for a player created with SbPlayerCreateWithUrl can be set
// after creation using SbPlayerSetDrmSystem. Because the DRM system
// is not available at the time of SbPlayerCreateWithUrl, it takes in
// a callback, |encrypted_media_init_data_encountered_cb|, which is
// run when encrypted media initial data is encountered.
SB_EXPORT SbPlayer
SbPlayerCreateWithUrl(const char* url,
SbWindow window,
SbMediaTime duration_pts,
SbPlayerStatusFunc player_status_func,
SbPlayerEncryptedMediaInitDataEncounteredCB
encrypted_media_init_data_encountered_cb,
void* context);
// Sets the DRM system of a running URL-based SbPlayer created with
// SbPlayerCreateWithUrl. This may only be run once for a given
// SbPlayer.
SB_EXPORT void SbPlayerSetDrmSystem(SbPlayer player, SbDrmSystem drm_system);
// Returns true if the given URL player output mode is supported by
// the platform. If this function returns true, it is okay to call
// SbPlayerCreate() with the given |output_mode|.
SB_EXPORT bool SbPlayerOutputModeSupportedWithUrl(
SbPlayerOutputMode output_mode);
#else // SB_HAS(PLAYER_WITH_URL)
// Creates a player that will be displayed on |window| for the specified
// |video_codec| and |audio_codec|, acquiring all resources needed to operate
// it, and returning an opaque handle to it. The expectation is that a new
// player will be created and destroyed for every playback.
//
// This function returns the created player. Note the following:
// - The associated decoder of the returned player should be assumed to not be
// in |kSbPlayerDecoderStateNeedsData| until SbPlayerSeek() has been called
// on it.
// - It is expected either that the thread that calls SbPlayerCreate is the same
// thread that calls the other |SbPlayer| functions for that player, or that
// there is a mutex guarding calls into each |SbPlayer| instance.
// - If there is a platform limitation on how many players can coexist
// simultaneously, then calls made to this function that attempt to exceed
// that limit will return |kSbPlayerInvalid|.
//
// |window|: The window that will display the player. |window| can be
// |kSbWindowInvalid| for platforms where video is only displayed on a
// particular window that the underlying implementation already has access to.
//
// |video_codec|: The video codec used for the player. If |video_codec| is
// |kSbMediaVideoCodecNone|, the player is an audio-only player. If
// |video_codec| is any other value, the player is an audio/video decoder.
//
// |audio_codec|: The audio codec used for the player. The value should never
// be |kSbMediaAudioCodecNone|. In addition, the caller must provide a
// populated |audio_header| if the audio codec is |kSbMediaAudioCodecAac|.
//
// |duration_pts|: The expected media duration in 90KHz ticks (PTS). It may be
// set to |SB_PLAYER_NO_DURATION| for live streams.
//
// |drm_system|: If the media stream has encrypted portions, then this
// parameter provides an appropriate DRM system, created with
// |SbDrmCreateSystem()|. If the stream does not have encrypted portions,
// then |drm_system| may be |kSbDrmSystemInvalid|.
//
// |audio_header|: Note that the caller must provide a populated |audio_header|
// if the audio codec is |kSbMediaAudioCodecAac|. Otherwise, |audio_header|
// can be NULL. See media.h for the format of the |SbMediaAudioHeader| struct.
#if SB_API_VERSION >= 6
// Note that |audio_specific_config| is a pointer and the content it points to
// is no longer valid after this function returns. The implementation has to
// make a copy of the content if it is needed after the function returns.
#endif // SB_API_VERSION >= 6
//
// |sample_deallocator_func|: If not |NULL|, the player calls this function
// on an internal thread to free the sample buffers passed into
// SbPlayerWriteSample().
//
// |decoder_status_func|: If not |NULL|, the decoder calls this function on an
// internal thread to provide an update on the decoder's status. No work
// should be done on this thread. Rather, it should just signal the client
// thread interacting with the decoder.
//
// |player_status_func|: If not |NULL|, the player calls this function on an
// internal thread to provide an update on the playback status. No work
// should be done on this thread. Rather, it should just signal the client
// thread interacting with the decoder.
//
// |context|: This is passed to all callbacks and is generally used to point
// at a class or struct that contains state associated with the player.
//
// |output_mode|: Selects how the decoded video frames will be output. For
// example, kSbPlayerOutputModePunchOut indicates that the decoded video
// frames will be output to a background video layer by the platform, and
// kSbPlayerOutputDecodeToTexture indicates that the decoded video frames
// should be made available for the application to pull via calls to
// SbPlayerGetCurrentFrame().
//
// |provider|: Only present in Starboard version 3 and up. If not |NULL|,
// then when output_mode == kSbPlayerOutputModeDecodeToTexture, the player MAY
// use the provider to create SbDecodeTargets on the renderer thread. A
// provider may not always be needed by the player, but if it is needed, and
// the provider is not given, the player will fail by returning
// kSbPlayerInvalid.
SB_EXPORT SbPlayer
SbPlayerCreate(SbWindow window,
SbMediaVideoCodec video_codec,
SbMediaAudioCodec audio_codec,
SbMediaTime duration_pts,
SbDrmSystem drm_system,
const SbMediaAudioHeader* audio_header,
SbPlayerDeallocateSampleFunc sample_deallocate_func,
SbPlayerDecoderStatusFunc decoder_status_func,
SbPlayerStatusFunc player_status_func,
void* context,
SbPlayerOutputMode output_mode,
SbDecodeTargetGraphicsContextProvider* context_provider);
// Returns true if the given player output mode is supported by the platform.
// If this function returns true, it is okay to call SbPlayerCreate() with
// the given |output_mode|.
SB_EXPORT bool SbPlayerOutputModeSupported(SbPlayerOutputMode output_mode,
SbMediaVideoCodec codec,
SbDrmSystem drm_system);
#endif // SB_HAS(PLAYER_WITH_URL)
// Destroys |player|, freeing all associated resources. Each callback must
// receive one more callback to say that the player was destroyed. Callbacks
// may be in-flight when SbPlayerDestroy is called, and should be ignored once
// this function is called.
//
// It is not allowed to pass |player| into any other |SbPlayer| function once
// SbPlayerDestroy has been called on that player.
//
// |player|: The player to be destroyed.
SB_EXPORT void SbPlayerDestroy(SbPlayer player);
// Tells the player to freeze playback (if playback has already started),
// reset or flush the decoder pipeline, and go back to the Prerolling state.
// The player should restart playback once it can display the frame at
// |seek_to_pts|, or the closest it can get. (Some players can only seek to
// I-Frames, for example.)
//
// - Seek must be called before samples are sent when starting playback for
// the first time, or the client never receives the
// |kSbPlayerDecoderStateNeedsData| signal.
// - A call to seek may interrupt another seek.
// - After this function is called, the client should not send any more audio
// or video samples until |SbPlayerDecoderStatusFunc| is called back with
// |kSbPlayerDecoderStateNeedsData| for each required media type.
// |SbPlayerDecoderStatusFunc| is the |decoder_status_func| callback function
// that was specified when the player was created (SbPlayerCreate).
//
// |player|: The SbPlayer in which the seek operation is being performed.
// |seek_to_pts|: The frame at which playback should begin.
// |ticket|: A user-supplied unique ID that is be passed to all subsequent
// |SbPlayerDecoderStatusFunc| calls. (That is the |decoder_status_func|
// callback function specified when calling SbPlayerCreate.)
//
// The |ticket| value is used to filter calls that may have been in flight
// when SbPlayerSeek was called. To be very specific, once SbPlayerSeek has
// been called with ticket X, a client should ignore all
// |SbPlayerDecoderStatusFunc| calls that do not pass in ticket X.
SB_EXPORT void SbPlayerSeek(SbPlayer player,
SbMediaTime seek_to_pts,
int ticket);
// Writes a single sample of the given media type to |player|'s input stream.
// Its data may be passed in via more than one buffers. The lifetime of
// |sample_buffers|, |sample_buffer_sizes|, |video_sample_info|, and
// |sample_drm_info| (as well as member |subsample_mapping| contained inside it)
// are not guaranteed past the call to SbPlayerWriteSample. That means that
// before returning, the implementation must synchronously copy any information
// it wants to retain from those structures.
//
// |player|: The player to which the sample is written.
// |sample_type|: The type of sample being written. See the |SbMediaType|
// enum in media.h.
// |sample_buffers|: A pointer to an array of buffers with
// |number_of_sample_buffers| elements that hold the data for this sample. The
// buffers are expected to be a portion of a bytestream of the codec type that
// the player was created with. The buffers should contain a sequence of whole
// NAL Units for video, or a complete audio frame. |sample_buffers| cannot be
// assumed to live past the call into SbPlayerWriteSample(), so it must be
// copied if its content will be used after SbPlayerWriteSample() returns.
// |sample_buffer_sizes|: A pointer to an array of sizes with
// |number_of_sample_buffers| elements. Each of them specify the number of
// bytes in the corresponding buffer contained in |sample_buffers|. None of
// them can be 0. |sample_buffer_sizes| cannot be assumed to live past the
// call into SbPlayerWriteSample(), so it must be copied if its content will
// be used after SbPlayerWriteSample() returns.
// |number_of_sample_buffers|: Specify the number of elements contained inside
// |sample_buffers| and |sample_buffer_sizes|. It has to be at least one, or
// the call will be ignored.
// |sample_pts|: The timestamp of the sample in 90KHz ticks (PTS). Note that
// samples MAY be written "slightly" out of order.
// |video_sample_info|: Information about a video sample. This value is
// required if |sample_type| is |kSbMediaTypeVideo|. Otherwise, it must be
// |NULL|.
// |sample_drm_info|: The DRM system for the media sample. This value is
// required for encrypted samples. Otherwise, it must be |NULL|.
SB_EXPORT void SbPlayerWriteSample(
SbPlayer player,
SbMediaType sample_type,
#if SB_API_VERSION >= 6
const void* const* sample_buffers,
const int* sample_buffer_sizes,
#else // SB_API_VERSION >= 6
const void** sample_buffers,
int* sample_buffer_sizes,
#endif // SB_API_VERSION >= 6
int number_of_sample_buffers,
SbMediaTime sample_pts,
const SbMediaVideoSampleInfo* video_sample_info,
const SbDrmSampleInfo* sample_drm_info);
// Writes a marker to |player|'s input stream of |stream_type| indicating that
// there are no more samples for that media type for the remainder of this
// media stream. This marker is invalidated, along with the rest of the stream's
// contents, after a call to SbPlayerSeek.
//
// |player|: The player to which the marker is written.
// |stream_type|: The type of stream for which the marker is written.
SB_EXPORT void SbPlayerWriteEndOfStream(SbPlayer player,
SbMediaType stream_type);
// Sets the player bounds to the given graphics plane coordinates. The changes
// do not take effect until the next graphics frame buffer swap. The default
// bounds for a player is the full screen. This function is only relevant when
// the |player| is created with the kSbPlayerOutputModePunchOut output mode, and
// if this is not the case then this function call can be ignored.
//
// This function is called on every graphics frame that changes the video
// bounds. For example, if the video bounds are being animated, then this will
// be called at up to 60 Hz. Since the function could be called up to once per
// frame, implementors should take care to avoid related performance concerns
// with such frequent calls.
//
// |player|: The player that is being resized.
// |z_index|: The z-index of the player. When the bounds of multiple players
// are overlapped, the one with larger z-index will be rendered on
// top of the ones with smaller z-index.
// |x|: The x-coordinate of the upper-left corner of the player.
// |y|: The y-coordinate of the upper-left corner of the player.
// |width|: The width of the player, in pixels.
// |height|: The height of the player, in pixels.
SB_EXPORT void SbPlayerSetBounds(SbPlayer player,
int z_index,
int x,
int y,
int width,
int height);
// Set the playback rate of the |player|. |rate| is default to 1.0 which
// indicates the playback is at its original speed. A |rate| greater than one
// will make the playback faster than its original speed. For example, when
// |rate| is 2, the video will be played at twice the speed as its original
// speed. A |rate| less than 1.0 will make the playback slower than its
// original speed. When |rate| is 0, the playback will be paused.
// The function returns true when the playback rate is set to |playback_rate| or
// to a rate that is close to |playback_rate| which the implementation supports.
// It returns false when the playback rate is unchanged, this can happen when
// |playback_rate| is negative or if it is too high to support.
SB_EXPORT bool SbPlayerSetPlaybackRate(SbPlayer player, double playback_rate);
// Sets the player's volume.
//
// |player|: The player in which the volume is being adjusted.
// |volume|: The new player volume. The value must be between |0.0| and |1.0|,
// inclusive. A value of |0.0| means that the audio should be muted, and a
// value of |1.0| means that it should be played at full volume.
SB_EXPORT void SbPlayerSetVolume(SbPlayer player, double volume);
// Gets a snapshot of the current player state and writes it to
// |out_player_info|. This function may be called very frequently and is
// expected to be inexpensive.
//
// |player|: The player about which information is being retrieved.
// |out_player_info|: The information retrieved for the player.
SB_EXPORT void SbPlayerGetInfo(SbPlayer player, SbPlayerInfo* out_player_info);
// Given a player created with the kSbPlayerOutputModeDecodeToTexture
// output mode, it will return a SbDecodeTarget representing the current frame
// to be rasterized. On GLES systems, this function must be called on a
// thread with an EGLContext current, and specifically the EGLContext that will
// be used to eventually render the frame. If this function is called with a
// |player| object that was created with an output mode other than
// kSbPlayerOutputModeDecodeToTexture, kSbDecodeTargetInvalid is returned.
SB_EXPORT SbDecodeTarget SbPlayerGetCurrentFrame(SbPlayer player);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // STARBOARD_PLAYER_H_