1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002 Josh Coalson
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 #ifndef FLAC__STREAM_DECODER_H
21 #define FLAC__STREAM_DECODER_H
31 FLAC__STREAM_DECODER_SEARCH_FOR_METADATA = 0,
32 FLAC__STREAM_DECODER_READ_METADATA,
33 FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC,
34 FLAC__STREAM_DECODER_READ_FRAME,
35 FLAC__STREAM_DECODER_END_OF_STREAM,
36 FLAC__STREAM_DECODER_ABORTED,
37 FLAC__STREAM_DECODER_UNPARSEABLE_STREAM,
38 FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR,
39 FLAC__STREAM_DECODER_ALREADY_INITIALIZED,
40 FLAC__STREAM_DECODER_INVALID_CALLBACK,
41 FLAC__STREAM_DECODER_UNINITIALIZED
42 } FLAC__StreamDecoderState;
43 extern const char * const FLAC__StreamDecoderStateString[];
46 FLAC__STREAM_DECODER_READ_STATUS_CONTINUE,
47 FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM,
48 FLAC__STREAM_DECODER_READ_STATUS_ABORT
49 } FLAC__StreamDecoderReadStatus;
50 extern const char * const FLAC__StreamDecoderReadStatusString[];
53 FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE,
54 FLAC__STREAM_DECODER_WRITE_STATUS_ABORT
55 } FLAC__StreamDecoderWriteStatus;
56 extern const char * const FLAC__StreamDecoderWriteStatusString[];
59 FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC,
60 FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER,
61 FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH
62 } FLAC__StreamDecoderErrorStatus;
63 extern const char * const FLAC__StreamDecoderErrorStatusString[];
65 /***********************************************************************
67 * class FLAC__StreamDecoder
69 ***********************************************************************/
71 struct FLAC__StreamDecoderProtected;
72 struct FLAC__StreamDecoderPrivate;
74 struct FLAC__StreamDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
75 struct FLAC__StreamDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
76 } FLAC__StreamDecoder;
78 /***********************************************************************
80 * Class constructor/destructor
82 ***********************************************************************/
85 * Any parameters that are not set before FLAC__stream_decoder_init()
86 * will take on the defaults from the constructor, shown below.
87 * For more on what the parameters mean, see the documentation.
89 * (*read_callback)() (DEFAULT: NULL ) The callbacks are the only values that MUST be set before FLAC__stream_decoder_init()
90 * (*write_callback)() (DEFAULT: NULL )
91 * (*metadata_callback)() (DEFAULT: NULL )
92 * (*error_callback)() (DEFAULT: NULL )
93 * void* client_data (DEFAULT: NULL ) passed back through the callbacks
95 FLAC__StreamDecoder *FLAC__stream_decoder_new();
96 void FLAC__stream_decoder_delete(FLAC__StreamDecoder *);
98 /***********************************************************************
100 * Public class method prototypes
102 ***********************************************************************/
105 * Various "set" methods. These may only be called when the decoder
106 * is in the state FLAC__STREAM_DECODER_UNINITIALIZED, i.e. after
107 * FLAC__stream_decoder_new() or FLAC__stream_decoder_finish(), but
108 * before FLAC__stream_decoder_init(). If this is the case they will
109 * return true, otherwise false.
111 * NOTE that these functions do not validate the values as many are
112 * interdependent. The FLAC__stream_decoder_init() function will do
113 * this, so make sure to pay attention to the state returned by
114 * FLAC__stream_decoder_init().
116 * Any parameters that are not set before FLAC__stream_decoder_init()
117 * will take on the defaults from the constructor. NOTE that
118 * FLAC__stream_decoder_flush() or FLAC__stream_decoder_reset() do
119 * NOT reset the values to the constructor defaults.
120 @@@@ update so that only _set_ methods that need to return FLAC__bool, else void; update documentation.html also
121 @@@@ update defaults above and in documentation.html about the metadata_respond/ignore defaults
123 FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadStatus (*value)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data));
124 FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data));
125 FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data));
126 FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, void (*value)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data));
127 FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value);
129 * These deserve special attention. By default, the decoder only calls the
130 * metadata_callback for the STREAMINFO block. These functions allow you to
131 * tell the decoder explicitly which blocks to parse and return via the
132 * metadata_callback and/or which to skip. Use a _respond_all(), _ignore() ...
133 * or _ignore_all(), _respond() ... sequence to exactly specify which blocks
134 * to return. Remember that some metadata blocks can be big so filtering out
135 * the ones you don't use can reduce the memory requirements of the decoder.
136 * Also note the special forms _respond/_ignore_application(id) for filtering
137 * APPLICATION blocks based on the application ID.
139 * STREAMINFO and SEEKTABLE blocks are always parsed and used internally, but
140 * they still can legally be filtered from the metadata_callback here.
142 FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type);
143 FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
144 FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder);
145 FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type);
146 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
147 FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder);
150 * Methods to return the current stream decoder state, number
151 * of channels, channel assignment, bits-per-sample, sample
152 * rate in Hz, and blocksize in samples. All but the decoder
153 * state will only be valid after decoding has started.
155 FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder);
156 unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder);
157 FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder);
158 unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder);
159 unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder);
160 unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder);
163 * Initialize the instance; should be called after construction and
164 * 'set' calls but before any of the 'process' calls. Will set and
165 * return the decoder state, which will be
166 * FLAC__STREAM_DECODER_SEARCH_FOR_METADATA if initialization
169 FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder);
172 * Flush the decoding buffer, release resources, and return the decoder
173 * state to FLAC__STREAM_DECODER_UNINITIALIZED.
175 void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder);
178 * state control methods
180 FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder);
181 FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder);
184 * Methods for decoding the data
186 FLAC__bool FLAC__stream_decoder_process_whole_stream(FLAC__StreamDecoder *decoder);
187 FLAC__bool FLAC__stream_decoder_process_metadata(FLAC__StreamDecoder *decoder);
188 FLAC__bool FLAC__stream_decoder_process_one_frame(FLAC__StreamDecoder *decoder);
189 FLAC__bool FLAC__stream_decoder_process_remaining_frames(FLAC__StreamDecoder *decoder);