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| author | Magnus Auvinen <magnus.auvinen@gmail.com> | 2007-05-22 15:03:32 +0000 |
|---|---|---|
| committer | Magnus Auvinen <magnus.auvinen@gmail.com> | 2007-05-22 15:03:32 +0000 |
| commit | 73aa9b71c1d8b5c5065d1e474f13601da3ca6b20 (patch) | |
| tree | 88b6a0a4a2ebdd33a88f4a25682581d329d33f6b /src/wavpack/metadata.c | |
| download | zcatch-73aa9b71c1d8b5c5065d1e474f13601da3ca6b20.tar.gz zcatch-73aa9b71c1d8b5c5065d1e474f13601da3ca6b20.zip | |
started the major restructure of svn
Diffstat (limited to 'src/wavpack/metadata.c')
| -rw-r--r-- | src/wavpack/metadata.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/wavpack/metadata.c b/src/wavpack/metadata.c new file mode 100644 index 00000000..578b17f9 --- /dev/null +++ b/src/wavpack/metadata.c @@ -0,0 +1,105 @@ +//////////////////////////////////////////////////////////////////////////// +// **** WAVPACK **** // +// Hybrid Lossless Wavefile Compressor // +// Copyright (c) 1998 - 2006 Conifer Software. // +// All Rights Reserved. // +// Distributed under the BSD Software License (see license.txt) // +//////////////////////////////////////////////////////////////////////////// + +// metadata.c + +// This module handles the metadata structure introduced in WavPack 4.0 + +#include "wavpack.h" + +int read_metadata_buff (WavpackContext *wpc, WavpackMetadata *wpmd) +{ + uchar tchar; + + if (!wpc->infile (&wpmd->id, 1) || !wpc->infile (&tchar, 1)) + return FALSE; + + wpmd->byte_length = tchar << 1; + + if (wpmd->id & ID_LARGE) { + wpmd->id &= ~ID_LARGE; + + if (!wpc->infile (&tchar, 1)) + return FALSE; + + wpmd->byte_length += (int32_t) tchar << 9; + + if (!wpc->infile (&tchar, 1)) + return FALSE; + + wpmd->byte_length += (int32_t) tchar << 17; + } + + if (wpmd->id & ID_ODD_SIZE) { + wpmd->id &= ~ID_ODD_SIZE; + wpmd->byte_length--; + } + + if (wpmd->byte_length && wpmd->byte_length <= sizeof (wpc->read_buffer)) { + uint32_t bytes_to_read = wpmd->byte_length + (wpmd->byte_length & 1); + + if (wpc->infile (wpc->read_buffer, bytes_to_read) != (int32_t) bytes_to_read) { + wpmd->data = NULL; + return FALSE; + } + + wpmd->data = wpc->read_buffer; + } + else + wpmd->data = NULL; + + return TRUE; +} + +int process_metadata (WavpackContext *wpc, WavpackMetadata *wpmd) +{ + WavpackStream *wps = &wpc->stream; + + switch (wpmd->id) { + case ID_DUMMY: + return TRUE; + + case ID_DECORR_TERMS: + return read_decorr_terms (wps, wpmd); + + case ID_DECORR_WEIGHTS: + return read_decorr_weights (wps, wpmd); + + case ID_DECORR_SAMPLES: + return read_decorr_samples (wps, wpmd); + + case ID_ENTROPY_VARS: + return read_entropy_vars (wps, wpmd); + + case ID_HYBRID_PROFILE: + return read_hybrid_profile (wps, wpmd); + + case ID_FLOAT_INFO: + return read_float_info (wps, wpmd); + + case ID_INT32_INFO: + return read_int32_info (wps, wpmd); + + case ID_CHANNEL_INFO: + return read_channel_info (wpc, wpmd); + + case ID_CONFIG_BLOCK: + return read_config_info (wpc, wpmd); + + case ID_WV_BITSTREAM: + return init_wv_bitstream (wpc, wpmd); + + case ID_SHAPING_WEIGHTS: + case ID_WVC_BITSTREAM: + case ID_WVX_BITSTREAM: + return TRUE; + + default: + return (wpmd->id & ID_OPTIONAL_DATA) ? TRUE : FALSE; + } +} |