seekable_stream_decoder.h

这是著名的TCPMP播放器在WINDWOWS,和WINCE下编译通过的源程序.笔者对其中的LIBMAD库做了针对ARM MPU的优化. 并增加了词幕功能.

 *
 * \default By default, only the \c STREAMINFO block is returned via the
 *          metadata callback.
 * \param  decoder  A decoder instance to set.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the decoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_all(FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_set_metadata_ignore().
 *
 * \default By default, only the \c STREAMINFO block is returned via the
 *          metadata callback.
 * \param  decoder  A decoder instance to set.
 * \param  type     See above.
 * \assert
 *    \code decoder != NULL \endcode
 *    \a type is valid
 * \retval FLAC__bool
 *    \c false if the decoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore(FLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_set_metadata_ignore_application().
 *
 * \default By default, only the \c STREAMINFO block is returned via the
 *          metadata callback.
 * \param  decoder  A decoder instance to set.
 * \param  id       See above.
 * \assert
 *    \code decoder != NULL \endcode
 *    \code id != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the decoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_application(FLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4]);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_set_metadata_ignore_all().
 *
 * \default By default, only the \c STREAMINFO block is returned via the
 *          metadata callback.
 * \param  decoder  A decoder instance to set.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the decoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_all(FLAC__SeekableStreamDecoder *decoder);

/** Get the current decoder state.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__SeekableStreamDecoderState
 *    The current decoder state.
 */
FLAC_API FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_state(const FLAC__SeekableStreamDecoder *decoder);

/** Get the state of the underlying stream decoder.
 *  Useful when the seekable stream decoder state is
 *  \c FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__StreamDecoderState
 *    The stream decoder state.
 */
FLAC_API FLAC__StreamDecoderState FLAC__seekable_stream_decoder_get_stream_decoder_state(const FLAC__SeekableStreamDecoder *decoder);

/** Get the current decoder state as a C string.
 *  This version automatically resolves
 *  \c FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR by getting the
 *  stream decoder's state.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval const char *
 *    The decoder state as a C string.  Do not modify the contents.
 */
FLAC_API const char *FLAC__seekable_stream_decoder_get_resolved_state_string(const FLAC__SeekableStreamDecoder *decoder);

/** Get the "MD5 signature checking" flag.
 *  This is the value of the setting, not whether or not the decoder is
 *  currently checking the MD5 (remember, it can be turned off automatically
 *  by a seek).  When the decoder is reset the flag will be restored to the
 *  value returned by this function.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    See above.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_get_md5_checking(const FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_get_channels().
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__seekable_stream_decoder_get_channels(const FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_get_channel_assignment().
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__ChannelAssignment
 *    See above.
 */
FLAC_API FLAC__ChannelAssignment FLAC__seekable_stream_decoder_get_channel_assignment(const FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_get_bits_per_sample().
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__seekable_stream_decoder_get_bits_per_sample(const FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_get_sample_rate().
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__seekable_stream_decoder_get_sample_rate(const FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_get_blocksize().
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__seekable_stream_decoder_get_blocksize(const FLAC__SeekableStreamDecoder *decoder);

/** Returns the decoder's current read position within the stream.
 *  The position is the byte offset from the start of the stream.
 *  Bytes before this position have been fully decoded.  Note that
 *  there may still be undecoded bytes in the decoder's read FIFO.
 *  The returned position is correct even after a seek.
 *
 * \param  decoder   A decoder instance to query.
 * \param  position  Address at which to return the desired position.
 * \assert
 *    \code decoder != NULL \endcode
 *    \code position != NULL \endcode
 * \retval FLAC__bool
 *    \c true if successful, \c false if there was an error from
 *    the 'tell' callback.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_get_decode_position(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *position);

/** Initialize the decoder instance.
 *  Should be called after FLAC__seekable_stream_decoder_new() and
 *  FLAC__seekable_stream_decoder_set_*() but before any of the
 *  FLAC__seekable_stream_decoder_process_*() functions.  Will set and return
 *  the decoder state, which will be FLAC__SEEKABLE_STREAM_DECODER_OK
 *  if initialization succeeded.
 *
 * \param  decoder  An uninitialized decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__SeekableStreamDecoderState
 *    \c FLAC__SEEKABLE_STREAM_DECODER_OK if initialization was
 *    successful; see FLAC__SeekableStreamDecoderState for the meanings
 *    of other return values.
 */
FLAC_API FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__SeekableStreamDecoder *decoder);

/** Finish the decoding process.
 *  Flushes the decoding buffer, releases resources, resets the decoder
 *  settings to their defaults, and returns the decoder state to
 *  FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED.
 *
 *  In the event of a prematurely-terminated decode, it is not strictly
 *  necessary to call this immediately before
 *  FLAC__seekable_stream_decoder_delete() but it is good practice to match
 *  every FLAC__seekable_stream_decoder_init() with a
 *  FLAC__seekable_stream_decoder_finish().
 *
 * \param  decoder  An uninitialized decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if MD5 checking is on AND a STREAMINFO block was available
 *    AND the MD5 signature in the STREAMINFO block was non-zero AND the
 *    signature does not match the one computed by the decoder; else
 *    \c true.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_finish(FLAC__SeekableStreamDecoder *decoder);

/** Flush the stream input.
 *  The decoder's input buffer will be cleared and the state set to
 *  \c FLAC__SEEKABLE_STREAM_DECODER_OK.  This will also turn off MD5
 *  checking.
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false if a memory allocation
 *    or stream decoder error occurs.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_flush(FLAC__SeekableStreamDecoder *decoder);

/** Reset the decoding process.
 *  The decoder's input buffer will be cleared and the state set to
 *  \c FLAC__SEEKABLE_STREAM_DECODER_OK.  This is similar to
 *  FLAC__seekable_stream_decoder_finish() except that the settings are
 *  preserved; there is no need to call FLAC__seekable_stream_decoder_init()
 *  before decoding again.  MD5 checking will be restored to its original
 *  setting.
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false if a memory allocation
 *    or stream decoder error occurs.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_reset(FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_process_single().
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    See above.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_process_single(FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_process_until_end_of_metadata().
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    See above.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_process_until_end_of_metadata(FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_process_until_end_of_stream().
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    See above.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_process_until_end_of_stream(FLAC__SeekableStreamDecoder *decoder);

/** This is inherited from FLAC__StreamDecoder; see
 *  FLAC__stream_decoder_skip_single_frame().
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    See above.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_skip_single_frame(FLAC__SeekableStreamDecoder *decoder);

/** Flush the input and seek to an absolute sample.
 *  Decoding will resume at the given sample.  Note that because of
 *  this, the next write callback may contain a partial block.
 *
 * \param  decoder  A decoder instance.
 * \param  sample   The target sample number to seek to.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false.
 */
FLAC_API FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample);

/* \} */

#ifdef __cplusplus
}
#endif

#endif