0ad19c7262
in Rockbox standard S3.28 format git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9272 a1c6a512-1295-4272-9138-f99709370657
151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
////////////////////////////////////////////////////////////////////////////
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// **** WAVPACK **** //
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// Hybrid Lossless Wavefile Compressor //
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// Copyright (c) 1998 - 2003 Conifer Software. //
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// All Rights Reserved. //
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// Distributed under the BSD Software License (see license.txt) //
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////////////////////////////////////////////////////////////////////////////
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// metadata.c
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// This module handles the metadata structure introduced in WavPack 4.0
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#include "wavpack.h"
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#include <string.h>
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int read_metadata_buff (WavpackContext *wpc, WavpackMetadata *wpmd)
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{
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uchar tchar;
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if (!wpc->infile (&wpmd->id, 1) || !wpc->infile (&tchar, 1))
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return FALSE;
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wpmd->byte_length = tchar << 1;
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if (wpmd->id & ID_LARGE) {
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wpmd->id &= ~ID_LARGE;
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if (!wpc->infile (&tchar, 1))
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return FALSE;
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wpmd->byte_length += (int32_t) tchar << 9;
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if (!wpc->infile (&tchar, 1))
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return FALSE;
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wpmd->byte_length += (int32_t) tchar << 17;
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}
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if (wpmd->id & ID_ODD_SIZE) {
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wpmd->id &= ~ID_ODD_SIZE;
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wpmd->byte_length--;
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}
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if (wpmd->byte_length && wpmd->byte_length <= (int32_t)sizeof (wpc->read_buffer)) {
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uint32_t bytes_to_read = wpmd->byte_length + (wpmd->byte_length & 1);
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if (wpc->infile (wpc->read_buffer, bytes_to_read) != (int32_t) bytes_to_read) {
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wpmd->data = NULL;
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return FALSE;
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}
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wpmd->data = wpc->read_buffer;
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}
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else
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wpmd->data = NULL;
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return TRUE;
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}
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int process_metadata (WavpackContext *wpc, WavpackMetadata *wpmd)
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{
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WavpackStream *wps = &wpc->stream;
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switch (wpmd->id) {
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case ID_DUMMY:
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return TRUE;
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case ID_DECORR_TERMS:
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return read_decorr_terms (wps, wpmd);
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case ID_DECORR_WEIGHTS:
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return read_decorr_weights (wps, wpmd);
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case ID_DECORR_SAMPLES:
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return read_decorr_samples (wps, wpmd);
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case ID_ENTROPY_VARS:
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return read_entropy_vars (wps, wpmd);
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case ID_HYBRID_PROFILE:
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return read_hybrid_profile (wps, wpmd);
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case ID_FLOAT_INFO:
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return read_float_info (wps, wpmd);
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case ID_INT32_INFO:
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return read_int32_info (wps, wpmd);
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case ID_CHANNEL_INFO:
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return read_channel_info (wpc, wpmd);
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case ID_CONFIG_BLOCK:
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return read_config_info (wpc, wpmd);
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case ID_WV_BITSTREAM:
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return init_wv_bitstream (wpc, wpmd);
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case ID_SHAPING_WEIGHTS:
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case ID_WVC_BITSTREAM:
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case ID_WVX_BITSTREAM:
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return TRUE;
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default:
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return (wpmd->id & ID_OPTIONAL_DATA) ? TRUE : FALSE;
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}
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}
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int copy_metadata (WavpackMetadata *wpmd, uchar *buffer_start, uchar *buffer_end)
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{
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uint32_t mdsize = wpmd->byte_length + (wpmd->byte_length & 1);
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WavpackHeader *wphdr = (WavpackHeader *) buffer_start;
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if (wpmd->byte_length & 1)
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((char *) wpmd->data) [wpmd->byte_length] = 0;
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mdsize += (wpmd->byte_length > 510) ? 4 : 2;
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buffer_start += wphdr->ckSize + 8;
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if (buffer_start + mdsize >= buffer_end)
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return FALSE;
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buffer_start [0] = wpmd->id | (wpmd->byte_length & 1 ? ID_ODD_SIZE : 0);
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buffer_start [1] = (wpmd->byte_length + 1) >> 1;
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if (wpmd->byte_length > 510) {
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buffer_start [0] |= ID_LARGE;
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buffer_start [2] = (wpmd->byte_length + 1) >> 9;
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buffer_start [3] = (wpmd->byte_length + 1) >> 17;
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}
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if (wpmd->data && wpmd->byte_length) {
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if (wpmd->byte_length > 510) {
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buffer_start [0] |= ID_LARGE;
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buffer_start [2] = (wpmd->byte_length + 1) >> 9;
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buffer_start [3] = (wpmd->byte_length + 1) >> 17;
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memcpy (buffer_start + 4, wpmd->data, mdsize - 4);
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}
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else
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memcpy (buffer_start + 2, wpmd->data, mdsize - 2);
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}
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wphdr->ckSize += mdsize;
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return TRUE;
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}
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void free_metadata (WavpackMetadata *wpmd)
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{
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wpmd->data = NULL;
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}
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