metadata.c

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////////////////////////////////////////////////////////////////////////////
//                           **** 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->privdata) || !wpc->infile (&tchar, 1, wpc->privdata))
	return FALSE;

    wpmd->byte_length = tchar << 1;

    if (wpmd->id & ID_LARGE) {
	wpmd->id &= ~ID_LARGE;

	if (!wpc->infile (&tchar, 1, wpc->privdata))
	    return FALSE;

	wpmd->byte_length += (long) tchar << 9; 

	if (!wpc->infile (&tchar, 1, wpc->privdata))
	    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, wpc->privdata) != (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;
    }
}