vp8dx.h 4.92 KB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */


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/*!\defgroup vp8_decoder WebM VP8/VP9 Decoder
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 * \ingroup vp8
 *
 * @{
 */
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/*!\file
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 * \brief Provides definitions for using VP8 or VP9 within the vpx Decoder
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 *        interface.
 */
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#ifndef VPX_VP8DX_H_
#define VPX_VP8DX_H_
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#ifdef __cplusplus
extern "C" {
#endif
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/* Include controls common to both the encoder and decoder */
#include "./vp8.h"

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/*!\name Algorithm interface for VP8
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 *
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 * This interface provides the capability to decode VP8 streams.
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 * @{
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 */
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extern vpx_codec_iface_t  vpx_codec_vp8_dx_algo;
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extern vpx_codec_iface_t *vpx_codec_vp8_dx(void);
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/*!@} - end algorithm interface member group*/
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/*!\name Algorithm interface for VP9
 *
 * This interface provides the capability to decode VP9 streams.
 * @{
 */
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extern vpx_codec_iface_t  vpx_codec_vp9_dx_algo;
extern vpx_codec_iface_t *vpx_codec_vp9_dx(void);
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/*!@} - end algorithm interface member group*/
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/*!\enum vp8_dec_control_id
 * \brief VP8 decoder control functions
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 *
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 * This set of macros define the control functions available for the VP8
 * decoder interface.
 *
 * \sa #vpx_codec_control
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 */
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enum vp8_dec_control_id {
  /** control function to get info on which reference frames were updated
   *  by the last decode
   */
  VP8D_GET_LAST_REF_UPDATES = VP8_DECODER_CTRL_ID_START,

  /** check if the indicated frame is corrupted */
  VP8D_GET_FRAME_CORRUPTED,

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  /** control function to get info on which reference frames were used
   *  by the last decode
   */
  VP8D_GET_LAST_REF_USED,

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  /** decryption function to decrypt encoded buffer data immediately
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   * before decoding. Takes a vpx_decrypt_init, which contains
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   * a callback function and opaque context pointer.
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   */
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  VPXD_SET_DECRYPTOR,
  VP8D_SET_DECRYPTOR = VPXD_SET_DECRYPTOR,
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  /** control function to get the dimensions that the current frame is decoded
   * at. This may be different to the intended display size for the frame as
   * specified in the wrapper or frame header (see VP9D_GET_DISPLAY_SIZE). */
  VP9D_GET_FRAME_SIZE,

  /** control function to get the current frame's intended display dimensions
   * (as specified in the wrapper or frame header). This may be different to
   * the decoded dimensions of this frame (see VP9D_GET_FRAME_SIZE). */
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  VP9D_GET_DISPLAY_SIZE,

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  /** control function to get the bit depth of the stream. */
  VP9D_GET_BIT_DEPTH,

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  /** control function to set the byte alignment of the planes in the reference
   * buffers. Valid values are power of 2, from 32 to 1024. A value of 0 sets
   * legacy alignment. I.e. Y plane is aligned to 32 bytes, U plane directly
   * follows Y plane, and V plane directly follows U plane. Default value is 0.
   */
  VP9_SET_BYTE_ALIGNMENT,

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  /** control function to invert the decoding order to from right to left. The
   * function is used in a test to confirm the decoding independence of tile
   * columns. The function may be used in application where this order
   * of decoding is desired.
   *
   * TODO(yaowu): Rework the unit test that uses this control, and in a future
   *              release, this test-only control shall be removed.
   */
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  VP9_INVERT_TILE_DECODE_ORDER,

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  VP8_DECODER_CTRL_ID_MAX
};
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/** Decrypt n bytes of data from input -> output, using the decrypt_state
 *  passed in VPXD_SET_DECRYPTOR.
 */
typedef void (*vpx_decrypt_cb)(void *decrypt_state, const unsigned char *input,
                               unsigned char *output, int count);

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/*!\brief Structure to hold decryption state
 *
 * Defines a structure to hold the decryption state and access function.
 */
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typedef struct vpx_decrypt_init {
    /*! Decrypt callback. */
    vpx_decrypt_cb decrypt_cb;

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    /*! Decryption state. */
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    void *decrypt_state;
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} vpx_decrypt_init;

/*!\brief A deprecated alias for vpx_decrypt_init.
 */
typedef vpx_decrypt_init vp8_decrypt_init;

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/*!\brief VP8 decoder control function parameter type
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 *
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 * Defines the data types that VP8D control functions take. Note that
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 * additional common controls are defined in vp8.h
 *
 */


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VPX_CTRL_USE_TYPE(VP8D_GET_LAST_REF_UPDATES,    int *)
VPX_CTRL_USE_TYPE(VP8D_GET_FRAME_CORRUPTED,     int *)
VPX_CTRL_USE_TYPE(VP8D_GET_LAST_REF_USED,       int *)
VPX_CTRL_USE_TYPE(VPXD_SET_DECRYPTOR,           vpx_decrypt_init *)
VPX_CTRL_USE_TYPE(VP8D_SET_DECRYPTOR,           vpx_decrypt_init *)
VPX_CTRL_USE_TYPE(VP9D_GET_DISPLAY_SIZE,        int *)
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VPX_CTRL_USE_TYPE(VP9D_GET_BIT_DEPTH,           unsigned int *)
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VPX_CTRL_USE_TYPE(VP9D_GET_FRAME_SIZE,          int *)
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VPX_CTRL_USE_TYPE(VP9_INVERT_TILE_DECODE_ORDER, int)
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/*! @} - end defgroup vp8_decoder */

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#ifdef __cplusplus
}  // extern "C"
#endif
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#endif  // VPX_VP8DX_H_