/* Copyright 2014 The Chromium Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**
* This file defines the <code>PPB_VideoDecoder</code> interface.
*/
[generate_thunk]
label Chrome {
/** Though not labeled 'channel=dev', 0.1 is a still a 'Dev' only API. */
M36 = 0.1,
M39 = 0.2,
M40 = 1.0,
M46 = 1.1
};
/**
* Video decoder interface.
*
* Typical usage:
* - Call Create() to create a new video decoder resource.
* - Call Initialize() to initialize it with a 3d graphics context and the
* desired codec profile.
* - Call Decode() continuously (waiting for each previous call to complete) to
* push bitstream buffers to the decoder.
* - Call GetPicture() continuously (waiting for each previous call to complete)
* to pull decoded pictures from the decoder.
* - Call Flush() to signal end of stream to the decoder and perform shutdown
* when it completes.
* - Call Reset() to quickly stop the decoder (e.g. to implement Seek) and wait
* for the callback before restarting decoding at another point.
* - To destroy the decoder, the plugin should release all of its references to
* it. Any pending callbacks will abort before the decoder is destroyed.
*
* Available video codecs vary by platform.
* All: theora, vorbis, vp8.
* Chrome and ChromeOS: aac, h264.
* ChromeOS: mpeg4.
*/
interface PPB_VideoDecoder {
/**
* Creates a new video decoder resource.
*
* @param[in] instance A <code>PP_Instance</code> identifying the instance
* with the video decoder.
*
* @return A <code>PP_Resource</code> corresponding to a video decoder if
* successful or 0 otherwise.
*/
PP_Resource Create(
[in] PP_Instance instance);
/**
* Determines if the given resource is a video decoder.
*
* @param[in] resource A <code>PP_Resource</code> identifying a resource.
*
* @return <code>PP_TRUE</code> if the resource is a
* <code>PPB_VideoDecoder</code>, <code>PP_FALSE</code> if the resource is
* invalid or some other type.
*/
PP_Bool IsVideoDecoder(
[in] PP_Resource resource);
/**
* Initializes a video decoder resource. This should be called after Create()
* and before any other functions.
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[in] graphics3d_context A <code>PPB_Graphics3D</code> resource to use
* during decoding.
* @param[in] profile A <code>PP_VideoProfile</code> specifying the video
* codec profile.
* @param[in] allow_software_fallback A <code>PP_Bool</code> specifying
* whether the decoder can fall back to software decoding if a suitable
* hardware decoder isn't available.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_NOTSUPPORTED if video decoding is not available, or the
* requested profile is not supported. In this case, the client may call
* Initialize() again with different parameters to find a good configuration.
*/
int32_t Initialize(
[in] PP_Resource video_decoder,
[in] PP_Resource graphics3d_context,
[in] PP_VideoProfile profile,
[in] PP_Bool allow_software_fallback,
[in] PP_CompletionCallback callback);
/**
* Initializes a video decoder resource. This should be called after Create()
* and before any other functions.
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[in] graphics3d_context A <code>PPB_Graphics3D</code> resource to use
* during decoding.
* @param[in] profile A <code>PP_VideoProfile</code> specifying the video
* codec profile.
* @param[in] acceleration A <code>PP_HardwareAcceleration</code> specifying
* whether to use a hardware accelerated or a software implementation.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_NOTSUPPORTED if video decoding is not available, or the
* requested profile is not supported. In this case, the client may call
* Initialize() again with different parameters to find a good configuration.
*/
[version = 0.2]
int32_t Initialize(
[in] PP_Resource video_decoder,
[in] PP_Resource graphics3d_context,
[in] PP_VideoProfile profile,
[in] PP_HardwareAcceleration acceleration,
[in] PP_CompletionCallback callback);
/**
* Initializes a video decoder resource. This should be called after Create()
* and before any other functions.
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[in] graphics3d_context A <code>PPB_Graphics3D</code> resource to use
* during decoding.
* @param[in] profile A <code>PP_VideoProfile</code> specifying the video
* codec profile.
* @param[in] acceleration A <code>PP_HardwareAcceleration</code> specifying
* whether to use a hardware accelerated or a software implementation.
* @param[in] min_picture_count A count of pictures the plugin would like to
* have in flight. This is effectively the number of times the plugin can
* call GetPicture() and get a decoded frame without calling
* RecyclePicture(). The decoder has its own internal minimum count, and will
* take the larger of its internal and this value. A client that doesn't care
* can therefore just pass in zero for this argument.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_NOTSUPPORTED if video decoding is not available, or the
* requested profile is not supported. In this case, the client may call
* Initialize() again with different parameters to find a good configuration.
* Returns PP_ERROR_BADARGUMENT if the requested minimum picture count is
* unreasonably large.
*/
[version = 1.1]
int32_t Initialize(
[in] PP_Resource video_decoder,
[in] PP_Resource graphics3d_context,
[in] PP_VideoProfile profile,
[in] PP_HardwareAcceleration acceleration,
[in] uint32_t min_picture_count,
[in] PP_CompletionCallback callback);
/**
* Decodes a bitstream buffer. Copies |size| bytes of data from the plugin's
* |buffer|. The plugin should wait until the decoder signals completion by
* returning PP_OK or by running |callback| before calling Decode() again.
*
* In general, each bitstream buffer should contain a demuxed bitstream frame
* for the selected video codec. For example, H264 decoders expect to receive
* one AnnexB NAL unit, including the 4 byte start code prefix, while VP8
* decoders expect to receive a bitstream frame without the IVF frame header.
*
* If the call to Decode() eventually results in a picture, the |decode_id|
* parameter is copied into the returned picture. The plugin can use this to
* associate decoded pictures with Decode() calls (e.g. to assign timestamps
* or frame numbers to pictures.) This value is opaque to the API so the
* plugin is free to pass any value.
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[in] decode_id An optional value, chosen by the plugin, that can be
* used to associate calls to Decode() with decoded pictures returned by
* GetPicture().
* @param[in] size Buffer size in bytes.
* @param[in] buffer Starting address of buffer.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called on
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_FAILED if the decoder isn't initialized or if a Flush()
* or Reset() call is pending.
* Returns PP_ERROR_INPROGRESS if there is another Decode() call pending.
* Returns PP_ERROR_NOMEMORY if a bitstream buffer can't be created.
* Returns PP_ERROR_ABORTED when Reset() is called while Decode() is pending.
*/
int32_t Decode(
[in] PP_Resource video_decoder,
[in] uint32_t decode_id,
[in] uint32_t size,
[in] mem_t buffer,
[in] PP_CompletionCallback callback);
/**
* Gets the next picture from the decoder. The picture is valid after the
* decoder signals completion by returning PP_OK or running |callback|. The
* plugin can call GetPicture() again after the decoder signals completion.
* When the plugin is finished using the picture, it should return it to the
* system by calling RecyclePicture().
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[out] picture A <code>PP_VideoPicture</code> to hold the decoded
* picture.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called on
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_FAILED if the decoder isn't initialized or if a Reset()
* call is pending.
* Returns PP_ERROR_INPROGRESS if there is another GetPicture() call pending.
* Returns PP_ERROR_ABORTED when Reset() is called, or if a call to Flush()
* completes while GetPicture() is pending.
*/
int32_t GetPicture(
[in] PP_Resource video_decoder,
[out] PP_VideoPicture_0_1 picture,
[in] PP_CompletionCallback callback);
/**
* Gets the next picture from the decoder. The picture is valid after the
* decoder signals completion by returning PP_OK or running |callback|. The
* plugin can call GetPicture() again after the decoder signals completion.
* When the plugin is finished using the picture, it should return it to the
* system by calling RecyclePicture().
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[out] picture A <code>PP_VideoPicture</code> to hold the decoded
* picture.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called on
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_FAILED if the decoder isn't initialized or if a Reset()
* call is pending.
* Returns PP_ERROR_INPROGRESS if there is another GetPicture() call pending.
* Returns PP_ERROR_ABORTED when Reset() is called, or if a call to Flush()
* completes while GetPicture() is pending.
*/
[version = 1.0]
int32_t GetPicture(
[in] PP_Resource video_decoder,
[out] PP_VideoPicture picture,
[in] PP_CompletionCallback callback);
/**
* Recycles a picture that the plugin has received from the decoder.
* The plugin should call this as soon as it has finished using the texture so
* the decoder can decode more pictures.
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[in] picture A <code>PP_VideoPicture</code> to return to
* the decoder.
*/
void RecyclePicture(
[in] PP_Resource video_decoder,
[in] PP_VideoPicture picture);
/**
* Flushes the decoder. The plugin should call Flush() when it reaches the
* end of its video stream in order to stop cleanly. The decoder will run any
* pending Decode() call to completion. The plugin should make no further
* calls to the decoder other than GetPicture() and RecyclePicture() until
* the decoder signals completion by running |callback|. Just before
* completion, any pending GetPicture() call will complete by running its
* callback with result PP_ERROR_ABORTED to signal that no more pictures are
* available. Any pictures held by the plugin remain valid during and after
* the flush and should be recycled back to the decoder.
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called on
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_FAILED if the decoder isn't initialized.
*/
int32_t Flush(
[in] PP_Resource video_decoder,
[in] PP_CompletionCallback callback);
/**
* Resets the decoder as quickly as possible. The plugin can call Reset() to
* skip to another position in the video stream. After Reset() returns, any
* pending calls to Decode() and GetPicture()) abort, causing their callbacks
* to run with PP_ERROR_ABORTED. The plugin should not make further calls to
* the decoder other than RecyclePicture() until the decoder signals
* completion by running |callback|. Any pictures held by the plugin remain
* valid during and after the reset and should be recycled back to the
* decoder.
*
* @param[in] video_decoder A <code>PP_Resource</code> identifying the video
* decoder.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called on
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
* Returns PP_ERROR_FAILED if the decoder isn't initialized.
*/
int32_t Reset(
[in] PP_Resource video_decoder,
[in] PP_CompletionCallback callback);
};
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