From e449d88b3e6b584998f8f38ed61467c35ca74466 Mon Sep 17 00:00:00 2001 From: Christian Gmeiner Date: Fri, 25 Feb 2005 17:05:30 +0000 Subject: Initial import of libwavpack git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6056 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/libwavpack/metadata.c | 105 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 apps/codecs/libwavpack/metadata.c (limited to 'apps/codecs/libwavpack/metadata.c') diff --git a/apps/codecs/libwavpack/metadata.c b/apps/codecs/libwavpack/metadata.c new file mode 100644 index 0000000000..40ede99cd4 --- /dev/null +++ b/apps/codecs/libwavpack/metadata.c @@ -0,0 +1,105 @@ +//////////////////////////////////////////////////////////////////////////// +// **** WAVPACK **** // +// Hybrid Lossless Wavefile Compressor // +// Copyright (c) 1998 - 2003 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 += (long) tchar << 9; + + if (!wpc->infile (&tchar, 1)) + return FALSE; + + wpmd->byte_length += (long) 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)) { + ulong bytes_to_read = wpmd->byte_length + (wpmd->byte_length & 1); + + if (wpc->infile (wpc->read_buffer, bytes_to_read) != (long) 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; + } +} -- cgit v1.2.3