129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Dave Chapman
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "system.h"
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#include "id3.h"
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#include "metadata_common.h"
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bool get_wave_metadata(int fd, struct mp3entry* id3)
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{
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/* Use the trackname part of the id3 structure as a temporary buffer */
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unsigned char* buf = (unsigned char *)id3->path;
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unsigned long totalsamples = 0;
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unsigned long channels = 0;
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unsigned long bitspersample = 0;
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unsigned long numbytes = 0;
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int read_bytes;
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int i;
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/* get RIFF chunk header */
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if ((lseek(fd, 0, SEEK_SET) < 0)
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|| ((read_bytes = read(fd, buf, 12)) < 12))
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{
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return false;
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}
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if ((memcmp(buf, "RIFF",4) != 0)
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|| (memcmp(&buf[8], "WAVE", 4) !=0 ))
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{
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return false;
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}
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/* iterate over WAVE chunks until 'data' chunk */
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while (true)
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{
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/* get chunk header */
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if ((read_bytes = read(fd, buf, 8)) < 8)
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return false;
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/* chunkSize */
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i = get_long_le(&buf[4]);
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if (memcmp(buf, "fmt ", 4) == 0)
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{
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/* get rest of chunk */
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if ((read_bytes = read(fd, buf, 16)) < 16)
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return false;
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i -= 16;
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/* skipping wFormatTag */
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/* wChannels */
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channels = buf[2] | (buf[3] << 8);
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/* dwSamplesPerSec */
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id3->frequency = get_long_le(&buf[4]);
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/* dwAvgBytesPerSec */
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id3->bitrate = (get_long_le(&buf[8]) * 8) / 1000;
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/* skipping wBlockAlign */
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/* wBitsPerSample */
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bitspersample = buf[14] | (buf[15] << 8);
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}
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else if (memcmp(buf, "data", 4) == 0)
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{
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numbytes = i;
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break;
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}
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else if (memcmp(buf, "fact", 4) == 0)
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{
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/* dwSampleLength */
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if (i >= 4)
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{
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/* get rest of chunk */
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if ((read_bytes = read(fd, buf, 4)) < 4)
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return false;
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i -= 4;
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totalsamples = get_long_le(buf);
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}
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}
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/* seek to next chunk (even chunk sizes must be padded) */
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if (i & 0x01)
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i++;
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if(lseek(fd, i, SEEK_CUR) < 0)
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return false;
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}
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if ((numbytes == 0) || (channels == 0))
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{
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return false;
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}
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if (totalsamples == 0)
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{
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/* for PCM only */
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totalsamples = numbytes
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/ ((((bitspersample - 1) / 8) + 1) * channels);
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}
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id3->vbr = false; /* All WAV files are CBR */
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id3->filesize = filesize(fd);
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/* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
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id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
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return true;
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}
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