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add FLAC__metadata_get_tags(), FLAC::Metadata::get_tags()

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This commit is contained in:
Josh Coalson 2004-07-30 01:54:29 +00:00
parent 9645dddaad
commit 1aca6b114b
7 changed files with 164 additions and 18 deletions
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2
doc/html/changelog.html
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@ -168,6 +168,7 @@
<LI>
libFLAC:
<UL>
<LI><B>Added</B> FLAC__metadata_get_tags()</LI>
<LI><B>Added</B> callback-based versions of metadata editing functions:
<UL>
<LI>FLAC__metadata_chain_read_with_callbacks()</LI>
@ -198,6 +199,7 @@
<LI>
libFLAC++:
<UL>
<LI><B>Added</B> FLAC::Metadata::get_tags()</LI>
<LI><B>Added</B> decoder functions for skipping single frames, also useful for quickly finding frame boundaries:
<UL>
<LI>FLAC::Decoder::Stream::skip_single_frame()</LI>

5
include/FLAC++/metadata.h
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@ -787,7 +787,7 @@ namespace FLAC {
* \ingroup flacpp_metadata
*
* \brief
* Level 0 metadata iterator.
* Level 0 metadata iterators.
*
* See the \link flac_metadata_level0 C layer equivalent \endlink
* for more.
@ -797,6 +797,9 @@ namespace FLAC {
//! See FLAC__metadata_get_streaminfo().
FLACPP_API bool get_streaminfo(const char *filename, StreamInfo &streaminfo);
//
//! See FLAC__metadata_get_tags().
FLACPP_API bool get_tags(const char *filename, VorbisComment *&tags);
/* \} */

33
include/FLAC/metadata.h
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@ -64,7 +64,7 @@
* There are three metadata interfaces of increasing complexity:
*
* Level 0:
* Read-only access to the STREAMINFO block.
* Read-only access to the STREAMINFO and VORBIS_COMMENT blocks.
*
* Level 1:
* Read-write access to all metadata blocks. This level is write-
@ -123,8 +123,8 @@ extern "C" {
* \ingroup flac_metadata
*
* \brief
* The level 0 interface consists of a single routine to read the
* STREAMINFO block.
* The level 0 interface consists of individual routines to read the
* STREAMINFO and VORBIS_COMMENT blocks, requiring only a filename.
*
* It skips any ID3v2 tag at the head of the file.
*
@ -135,17 +135,40 @@ extern "C" {
* will skip any ID3v2 tag at the head of the file.
*
* \param filename The path to the FLAC file to read.
* \param streaminfo A pointer to space for the STREAMINFO block.
* \param streaminfo A pointer to space for the STREAMINFO block. Since
* FLAC__StreamMetadata is a simple structure with no
* memory allocation involved, you pass the address of
* an existing structure. It need not be initialized.
* \assert
* \code filename != NULL \endcode
* \code streaminfo != NULL \endcode
* \retval FLAC__bool
* \c true if a valid STREAMINFO block was read from \a filename. Returns
* \c false if there was a memory allocation error, a file decoder error,
* or the file contained no STREAMINFO block.
* or the file contained no STREAMINFO block. (A memory allocation error
* is possible because this function must set up a file decoder.)
*/
FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo);
/** Read the VORBIS_COMMENT metadata block of the given FLAC file. This
* function will skip any ID3v2 tag at the head of the file.
*
* \param filename The path to the FLAC file to read.
* \param tags The address where the returned pointer will be
* stored. The \a tags object must be deleted by
* the caller using FLAC__metadata_object_delete().
* \assert
* \code filename != NULL \endcode
* \code streaminfo != NULL \endcode
* \retval FLAC__bool
* \c true if a valid VORBIS_COMMENT block was read from \a filename,
* and \a *tags will be set to the address of the tag structure.
* Returns \c false if there was a memory allocation error, a file
* decoder error, or the file contained no VORBIS_COMMENT block, and
* \a *tags will be set to \c NULL.
*/
FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags);
/* \} */

22
src/libFLAC++/metadata.cpp
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@ -985,10 +985,26 @@ namespace FLAC {
{
FLAC__ASSERT(0 != filename);
::FLAC__StreamMetadata s;
::FLAC__StreamMetadata object;
if(::FLAC__metadata_get_streaminfo(filename, &s)) {
streaminfo = s;
if(::FLAC__metadata_get_streaminfo(filename, &object)) {
streaminfo = object;
return true;
}
else
return false;
}
FLACPP_API bool get_tags(const char *filename, VorbisComment *&tags)
{
FLAC__ASSERT(0 != filename);
::FLAC__StreamMetadata *object;
tags = 0;
if(::FLAC__metadata_get_tags(filename, &object)) {
tags = new VorbisComment(object, /*copy=*/false);
return true;
}
else

84
src/libFLAC/metadata_iterators.c
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@ -153,8 +153,8 @@ static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecode
typedef struct {
FLAC__bool got_error;
FLAC__bool got_streaminfo;
FLAC__StreamMetadata *streaminfo;
FLAC__bool got_object;
FLAC__StreamMetadata *object;
} level0_client_data;
FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
@ -171,8 +171,8 @@ FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__St
return false;
cd.got_error = false;
cd.got_streaminfo = false;
cd.streaminfo = streaminfo;
cd.got_object = false;
cd.object = 0;
FLAC__file_decoder_set_md5_checking(decoder, false);
FLAC__file_decoder_set_filename(decoder, filename);
@ -189,17 +189,77 @@ FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__St
return false;
}
/* the first thing decoded must be the STREAMINFO block: */
if(!FLAC__file_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
FLAC__file_decoder_finish(decoder);
FLAC__file_decoder_delete(decoder);
if(0 != cd.object)
FLAC__metadata_object_delete(cd.object);
return false;
}
FLAC__file_decoder_finish(decoder);
FLAC__file_decoder_delete(decoder);
return !cd.got_error && cd.got_streaminfo;
if(cd.got_object) {
/* can just copy the contents since STREAMINFO has no internal structure */
*streaminfo = *(cd.object);
}
if(0 != cd.object)
FLAC__metadata_object_delete(cd.object);
return cd.got_object;
}
FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
{
level0_client_data cd;
FLAC__FileDecoder *decoder;
FLAC__ASSERT(0 != filename);
FLAC__ASSERT(0 != tags);
decoder = FLAC__file_decoder_new();
if(0 == decoder)
return false;
*tags = 0;
cd.got_error = false;
cd.got_object = false;
cd.object = 0;
FLAC__file_decoder_set_md5_checking(decoder, false);
FLAC__file_decoder_set_filename(decoder, filename);
FLAC__file_decoder_set_metadata_ignore_all(decoder);
FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
FLAC__file_decoder_set_write_callback(decoder, write_callback_);
FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
FLAC__file_decoder_set_error_callback(decoder, error_callback_);
FLAC__file_decoder_set_client_data(decoder, &cd);
if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
FLAC__file_decoder_finish(decoder);
FLAC__file_decoder_delete(decoder);
return false;
}
if(!FLAC__file_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
FLAC__file_decoder_finish(decoder);
FLAC__file_decoder_delete(decoder);
if(0 != cd.object)
FLAC__metadata_object_delete(cd.object);
return false;
}
FLAC__file_decoder_finish(decoder);
FLAC__file_decoder_delete(decoder);
if(cd.got_object)
*tags = cd.object;
return cd.got_object;
}
FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
@ -214,9 +274,15 @@ void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMeta
level0_client_data *cd = (level0_client_data *)client_data;
(void)decoder;
if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && 0 != cd->streaminfo) {
*(cd->streaminfo) = *metadata;
cd->got_streaminfo = true;
/*
* we assume we only get here when the one metadata block we were
* looking for was passed to us
*/
if(!cd->got_object) {
if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
cd->got_error = true;
else
cd->got_object = true;
}
}

18
src/test_libFLAC++/metadata_manip.cpp
View File

@ -591,6 +591,7 @@ static bool remove_file_(const char *filename)
static bool test_level_0_()
{
FLAC::Metadata::StreamInfo streaminfo;
FLAC::Metadata::VorbisComment *tags = 0;
printf("\n\n++++++ testing level 0 interface\n");
@ -600,6 +601,8 @@ static bool test_level_0_()
if(!test_file_(flacfile_, /*ignore_metadata=*/true))
return false;
printf("testing FLAC::Metadata::get_streaminfo()... ");
if(!FLAC::Metadata::get_streaminfo(flacfile_, streaminfo))
return die_("during FLAC::Metadata::get_streaminfo()");
@ -615,6 +618,21 @@ static bool test_level_0_()
if(streaminfo.get_max_blocksize() != 576)
return die_("mismatch in streaminfo.get_max_blocksize()");
printf("OK\n");
printf("testing FLAC::Metadata::get_tags()... ");
if(!FLAC::Metadata::get_tags(flacfile_, tags))
return die_("during FLAC::Metadata::get_tags()");
/* check to see if some basic data matches (c.f. generate_file_()) */
if(tags->get_num_comments() != 0)
return die_("mismatch in tags->get_num_comments()");
printf("OK\n");
delete tags;
if(!remove_file_(flacfile_))
return false;

18
src/test_libFLAC/metadata_manip.c
View File

@ -604,6 +604,7 @@ static FLAC__bool remove_file_(const char *filename)
static FLAC__bool test_level_0_()
{
FLAC__StreamMetadata streaminfo;
FLAC__StreamMetadata *tags = 0;
printf("\n\n++++++ testing level 0 interface\n");
@ -613,6 +614,8 @@ static FLAC__bool test_level_0_()
if(!test_file_(flacfile_, decoder_metadata_callback_null_))
return false;
printf("testing FLAC__metadata_get_streaminfo()... ");
if(!FLAC__metadata_get_streaminfo(flacfile_, &streaminfo))
return die_("during FLAC__metadata_get_streaminfo()");
@ -628,6 +631,21 @@ static FLAC__bool test_level_0_()
if(streaminfo.data.stream_info.max_blocksize != 576)
return die_("mismatch in streaminfo.data.stream_info.max_blocksize");
printf("OK\n");
printf("testing FLAC__metadata_get_tags()... ");
if(!FLAC__metadata_get_tags(flacfile_, &tags))
return die_("during FLAC__metadata_get_tags()");
/* check to see if some basic data matches (c.f. generate_file_()) */
if(tags->data.vorbis_comment.num_comments != 0)
return die_("mismatch in tags->data.vorbis_comment.num_comments");
printf("OK\n");
FLAC__metadata_object_delete(tags);
if(!remove_file_(flacfile_))
return false;