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.

 */
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]);

/** Direct the decoder to filter out all metadata blocks of any type.
 *
 * \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__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder);

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

/** Get the current decoder state as a C string.
 *
 * \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__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder);

/** Get the current number of channels in the stream being decoded.
 *  Will only be valid after decoding has started and will contain the
 *  value from the most recently decoded frame header.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder);

/** Get the current channel assignment in the stream being decoded.
 *  Will only be valid after decoding has started and will contain the
 *  value from the most recently decoded frame header.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__ChannelAssignment
 *    See above.
 */
FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder);

/** Get the current sample resolution in the stream being decoded.
 *  Will only be valid after decoding has started and will contain the
 *  value from the most recently decoded frame header.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder);

/** Get the current sample rate in Hz of the stream being decoded.
 *  Will only be valid after decoding has started and will contain the
 *  value from the most recently decoded frame header.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder);

/** Get the current blocksize of the stream being decoded.
 *  Will only be valid after decoding has started and will contain the
 *  value from the most recently decoded frame header.
 *
 * \param  decoder  A decoder instance to query.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval unsigned
 *    See above.
 */
FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder);

/** Initialize the decoder instance.
 *  Should be called after FLAC__stream_decoder_new() and
 *  FLAC__stream_decoder_set_*() but before any of the
 *  FLAC__stream_decoder_process_*() functions.  Will set and return the
 *  decoder state, which will be FLAC__STREAM_DECODER_SEARCH_FOR_METADATA
 *  if initialization succeeded.
 *
 * \param  decoder  An uninitialized decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__StreamDecoderState
 *    \c FLAC__STREAM_DECODER_SEARCH_FOR_METADATA if initialization was
 *    successful; see FLAC__StreamDecoderState for the meanings of other
 *    return values.
 */
FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *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__STREAM_DECODER_UNINITIALIZED.
 *
 *  In the event of a prematurely-terminated decode, it is not strictly
 *  necessary to call this immediately before FLAC__stream_decoder_delete()
 *  but it is good practice to match every FLAC__stream_decoder_init()
 *  with a FLAC__stream_decoder_finish().
 *
 * \param  decoder  An uninitialized decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 */
FLAC_API void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder);

/** Flush the stream input.
 *  The decoder's input buffer will be cleared and the state set to
 *  \c FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC.
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false if a memory allocation
 *    error occurs.
 */
FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder);

/** Reset the decoding process.
 *  The decoder's input buffer will be cleared and the state set to
 *  \c FLAC__STREAM_DECODER_SEARCH_FOR_METADATA.  This is similar to
 *  FLAC__stream_decoder_finish() except that the settings are
 *  preserved; there is no need to call FLAC__stream_decoder_init()
 *  before decoding again.
 *
 * \param  decoder  A decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false if a memory allocation
 *    error occurs.
 */
FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder);

/** Decode one metadata block or audio frame.
 *  This version instructs the decoder to decode a either a single metadata
 *  block or a single frame and stop, unless the callbacks return a fatal
 *  error or the read callback returns
 *  \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM.
 *
 *  As the decoder needs more input it will call the read callback.
 *  Depending on what was decoded, the metadata or write callback will be
 *  called with the decoded metadata block or audio frame, unless an error
 *  occurred.  If the decoder loses sync it will call the error callback
 *  instead.
 *
 *  Unless there is a fatal read error or end of stream, this function
 *  will return once one whole frame is decoded.  In other words, if the
 *  stream is not synchronized or points to a corrupt frame header, the
 *  decoder will continue to try and resync until it gets to a valid
 *  frame, then decode one frame, then return.  If the decoder points to
 *  frame whose frame CRC in the frame footer does not match the
 *  computed frame CRC, this function will issue a
 *  FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH error to the
 *  error callback, and return, having decoded one complete, although
 *  corrupt, frame.  (Such corrupted frames are sent as silence of the
 *  correct length to the write callback.)
 *
 * \param  decoder  An initialized decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if any read or write error occurred (except
 *    \c FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
 *    in any case, check the decoder state with
 *    FLAC__stream_decoder_get_state() to see what went wrong or to
 *    check for lost synchronization (a sign of stream corruption).
 */
FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder);

/** Decode until the end of the metadata.
 *  This version instructs the decoder to decode from the current position
 *  and continue until all the metadata has been read, or until the
 *  callbacks return a fatal error or the read callback returns
 *  \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM.
 *
 *  As the decoder needs more input it will call the read callback.
 *  As each metadata block is decoded, the metadata callback will be called
 *  with the decoded metadata.  If the decoder loses sync it will call the
 *  error callback.
 *
 * \param  decoder  An initialized decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if any read or write error occurred (except
 *    \c FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
 *    in any case, check the decoder state with
 *    FLAC__stream_decoder_get_state() to see what went wrong or to
 *    check for lost synchronization (a sign of stream corruption).
 */
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder);

/** Decode until the end of the stream.
 *  This version instructs the decoder to decode from the current position
 *  and continue until the end of stream (the read callback returns
 *  \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM), or until the
 *  callbacks return a fatal error.
 *
 *  As the decoder needs more input it will call the read callback.
 *  As each metadata block and frame is decoded, the metadata or write
 *  callback will be called with the decoded metadata or frame.  If the
 *  decoder loses sync it will call the error callback.
 *
 * \param  decoder  An initialized decoder instance.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if any read or write error occurred (except
 *    \c FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
 *    in any case, check the decoder state with
 *    FLAC__stream_decoder_get_state() to see what went wrong or to
 *    check for lost synchronization (a sign of stream corruption).
 */
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder);

/** Skip one audio frame.
 *  This version instructs the decoder to 'skip' a single frame and stop,
 *  unless the callbacks return a fatal error or the read callback returns
 *  \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM.
 *
 *  The decoding flow is the same as what occurs when
 *  FLAC__stream_decoder_process_single() is called to process an audio
 *  frame, except that this function does not decode the parsed data into
 *  PCM or call the write callback.  The integrity of the frame is still
 *  checked the same way as in the other process functions.
 *
 *  This function will return once one whole frame is skipped, in the
 *  same way that FLAC__stream_decoder_process_single() will return once
 *  one whole frame is decoded.
 *
 *  This function, when used from the higher FLAC__SeekableStreamDecoder
 *  layer, can be used in more quickly determining FLAC frame boundaries
 *  when decoding of the actual data is not needed, for example when an
 *  application is separating a FLAC stream into frames for editing or
 *  storing in a container.  To do this, the application can use
 *  FLAC__seekable_stream_decoder_skip_single_frame() to quickly advance
 *  to the next frame, then use
 *  FLAC__seekable_stream_decoder_get_decode_position() to find the new
 *  frame boundary.
 *
 *  This function should only be called when the stream has advanced
 *  past all the metadata, otherwise it will return \c false.
 *
 * \param  decoder  An initialized decoder instance not in a metadata
 *                  state.
 * \assert
 *    \code decoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if any read or write error occurred (except
 *    \c FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), or if the decoder
 *    is in the FLAC__STREAM_DECODER_SEARCH_FOR_METADATA or
 *    FLAC__STREAM_DECODER_READ_METADATA state, else \c true;
 *    in any case, check the decoder state with
 *    FLAC__stream_decoder_get_state() to see what went wrong or to
 *    check for lost synchronization (a sign of stream corruption).
 */
FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder);

/* \} */

#ifdef __cplusplus
}
#endif

#endif