forked from len0rd/rockbox
wave metadata parser reduces binsize.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25161 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Yoshihisa Uchida
parent
efeb43b341
commit
2d1937a158
1 changed files with 53 additions and 64 deletions
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@ -21,8 +21,6 @@
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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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@ -51,28 +49,29 @@ enum {
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FMT_CHUNK,
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FACT_CHUNK,
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DATA_CHUNK,
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NUM_CHUNKS,
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};
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/* Wave chunk names */
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static const unsigned char *wave_chunknames[NUM_CHUNKS] =
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{
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[RIFF_CHUNK] = "RIFF",
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[WAVE_CHUNK] = "WAVE",
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[FMT_CHUNK] = "fmt ",
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[FACT_CHUNK] = "fact",
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[DATA_CHUNK] = "data",
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};
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#define WAVE_CHUNKNAME_LENGTH 4
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#define WAVE_CHUNKSIZE_LENGTH 4
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static const unsigned char *wave_chunklist = "RIFF"
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"WAVE"
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"fmt "
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"fact"
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"data";
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/* Wave64 GUIDs */
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static const unsigned char *wave64_chunknames[NUM_CHUNKS] =
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{
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[RIFF_CHUNK] = "riff\x2e\x91\xcf\x11\xa5\xd6\x28\xdb\x04\xc1\x00\x00",
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[WAVE_CHUNK] = "wave\xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a",
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[FMT_CHUNK] = "fmt \xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a",
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[FACT_CHUNK] = "fact\xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a",
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[DATA_CHUNK] = "data\xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a",
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};
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#define WAVE64_CHUNKNAME_LENGTH 16
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#define WAVE64_CHUNKSIZE_LENGTH 8
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static const unsigned char *wave64_chunklist
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= "riff\x2e\x91\xcf\x11\xa5\xd6\x28\xdb\x04\xc1\x00\x00"
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"wave\xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a"
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"fmt \xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a"
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"fact\xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a"
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"data\xf3\xac\xd3\x11\x8c\xd1\x00\xc0\x4f\x8e\xdb\x8a";
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/* support formats */
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enum
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@ -113,45 +112,35 @@ static void set_totalsamples(struct wave_fmt *fmt, struct mp3entry* id3)
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case WAVE_FORMAT_MULAW:
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case IBM_FORMAT_ALAW:
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case IBM_FORMAT_MULAW:
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if (fmt->bitspersample != 0 && fmt->channels != 0)
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fmt->totalsamples = fmt->numbytes / ((fmt->bitspersample >> 3) * fmt->channels);
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break;
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case WAVE_FORMAT_ADPCM:
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case WAVE_FORMAT_DVI_ADPCM:
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case WAVE_FORMAT_XBOX_ADPCM:
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if (fmt->blockalign != 0)
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fmt->totalsamples = (fmt->numbytes / fmt->blockalign) * fmt->samplesperblock;
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fmt->blockalign = fmt->bitspersample * fmt->channels >> 3;
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fmt->samplesperblock = 1;
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break;
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case WAVE_FORMAT_YAMAHA_ADPCM:
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if (fmt->blockalign != 0 && fmt->channels != 0)
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if (id3->channels != 0)
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{
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if (fmt->samplesperblock == 0)
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{
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if (fmt->blockalign == ((id3->frequency / 60) + 4) * fmt->channels)
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fmt->samplesperblock = id3->frequency / 30;
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else
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fmt->samplesperblock = (fmt->blockalign << 1) / fmt->channels;
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}
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fmt->totalsamples = (fmt->numbytes / fmt->blockalign) * fmt->samplesperblock;
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fmt->samplesperblock =
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(fmt->blockalign == ((id3->frequency / 60) + 4) * fmt->channels)?
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id3->frequency / 30 : (fmt->blockalign << 1) / fmt->channels;
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}
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break;
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case WAVE_FORMAT_DIALOGIC_OKI_ADPCM:
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fmt->totalsamples = fmt->numbytes << 1;
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fmt->blockalign = 1;
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fmt->samplesperblock = 2;
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break;
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case WAVE_FORMAT_SWF_ADPCM:
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if (fmt->blockalign != 0 && fmt->bitspersample != 0 && fmt->channels != 0)
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if (fmt->bitspersample != 0 && id3->channels != 0)
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{
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if (fmt->samplesperblock == 0)
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fmt->samplesperblock = (((fmt->blockalign << 3) - 2) / fmt->channels - 22)
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/ fmt->bitspersample;
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fmt->totalsamples = (fmt->numbytes / fmt->blockalign) * fmt->samplesperblock;
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fmt->samplesperblock
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= (((fmt->blockalign << 3) - 2) / fmt->channels - 22)
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/ fmt->bitspersample + 1;
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}
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break;
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default:
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fmt->totalsamples = 0;
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break;
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}
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if (fmt->blockalign != 0)
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fmt->totalsamples = (fmt->numbytes / fmt->blockalign) * fmt->samplesperblock;
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}
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static void parse_riff_format(unsigned char* buf, int fmtsize, struct wave_fmt *fmt,
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@ -208,15 +197,16 @@ static void parse_riff_format(unsigned char* buf, int fmtsize, struct wave_fmt *
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}
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}
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static bool read_header(int fd, struct mp3entry* id3, const unsigned char **chunknames, bool is_64)
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static bool read_header(int fd, struct mp3entry* id3, const unsigned char *chunknames,
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bool is_64)
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{
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/* Use the temporary buffer */
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unsigned char* buf = (unsigned char *)id3->path;
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struct wave_fmt fmt;
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unsigned int namelen = (is_64)? 16 : 4;
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unsigned int sizelen = (is_64)? 8 : 4;
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unsigned int namelen = (is_64)? WAVE64_CHUNKNAME_LENGTH : WAVE_CHUNKNAME_LENGTH;
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unsigned int sizelen = (is_64)? WAVE64_CHUNKSIZE_LENGTH : WAVE_CHUNKSIZE_LENGTH;
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unsigned int len = namelen + sizelen;
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uint64_t chunksize;
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uint64_t offset = len + namelen;
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@ -228,8 +218,8 @@ static bool read_header(int fd, struct mp3entry* id3, const unsigned char **chun
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lseek(fd, 0, SEEK_SET);
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read(fd, buf, offset);
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if ((memcmp(buf, chunknames[RIFF_CHUNK], namelen) != 0) ||
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(memcmp(buf + len, chunknames[WAVE_CHUNK], namelen) != 0))
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if ((memcmp(buf, chunknames + RIFF_CHUNK * namelen, namelen) != 0) ||
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(memcmp(buf + len, chunknames + WAVE_CHUNK * namelen, namelen) != 0))
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{
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DEBUGF("metadata error: missing riff header.\n");
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return false;
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@ -251,7 +241,7 @@ static bool read_header(int fd, struct mp3entry* id3, const unsigned char **chun
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chunksize = (is_64) ? get_uint64_le(buf + namelen) - len :
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get_long_le(buf + namelen);
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if (memcmp(buf, chunknames[DATA_CHUNK], namelen) == 0)
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if (memcmp(buf, chunknames + DATA_CHUNK * namelen, namelen) == 0)
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{
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DEBUGF("find 'data' chunk\n");
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fmt.numbytes = chunksize;
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@ -265,7 +255,7 @@ static bool read_header(int fd, struct mp3entry* id3, const unsigned char **chun
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offset += chunksize;
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read_data = 0;
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if (memcmp(buf, chunknames[FMT_CHUNK], namelen) == 0)
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if (memcmp(buf, chunknames + FMT_CHUNK * namelen, namelen) == 0)
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{
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DEBUGF("find 'fmt ' chunk\n");
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@ -281,7 +271,7 @@ static bool read_header(int fd, struct mp3entry* id3, const unsigned char **chun
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read(fd, buf, read_data);
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parse_riff_format(buf, read_data, &fmt, id3);
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}
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else if (memcmp(buf, chunknames[FACT_CHUNK], namelen) == 0)
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else if (memcmp(buf, chunknames + FACT_CHUNK * namelen, namelen) == 0)
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{
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DEBUGF("find 'fact' chunk\n");
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@ -301,20 +291,19 @@ static bool read_header(int fd, struct mp3entry* id3, const unsigned char **chun
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if (fmt.totalsamples == 0)
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set_totalsamples(&fmt, id3);
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if (id3->frequency == 0 || id3->bitrate == 0)
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{
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DEBUGF("metadata error: frequency or bitrate is 0\n");
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return false;
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}
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id3->vbr = false; /* All Wave/Wave64 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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if(fmt.formattag != WAVE_FORMAT_ATRAC3)
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{
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if (id3->frequency != 0)
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id3->length = ((int64_t) fmt.totalsamples * 1000) / id3->frequency;
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}
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else
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{
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if (id3->bitrate != 0)
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id3->length = ((id3->filesize - id3->first_frame_offset) * 8) / id3->bitrate;
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}
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id3->length = (fmt.formattag != WAVE_FORMAT_ATRAC3)?
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(uint64_t)fmt.totalsamples * 1000 / id3->frequency :
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((id3->filesize - id3->first_frame_offset) * 8) / id3->bitrate;
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/* output header/id3 info (for debug) */
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DEBUGF("%s header info ----\n", (is_64)? "wave64" : "wave");
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@ -335,10 +324,10 @@ static bool read_header(int fd, struct mp3entry* id3, const unsigned char **chun
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bool get_wave_metadata(int fd, struct mp3entry* id3)
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{
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return read_header(fd, id3, (const unsigned char **)&wave_chunknames, false);
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return read_header(fd, id3, wave_chunklist, false);
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}
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bool get_wave64_metadata(int fd, struct mp3entry* id3)
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{
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return read_header(fd, id3, (const unsigned char **)&wave64_chunknames, true);
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return read_header(fd, id3, wave64_chunklist, true);
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}
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