mirror of
https://github.com/Rockbox/rockbox.git
synced 2025-10-14 02:27:39 -04:00
New FLAC decoder from the ffmpeg project
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7656 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman
parent
48be8e6a8b
commit
273d2e81f7
17 changed files with 2202 additions and 301 deletions
292
apps/codecs/libffmpegFLAC/main.c
Normal file
292
apps/codecs/libffmpegFLAC/main.c
Normal file
|
|
@ -0,0 +1,292 @@
|
|||
/***************************************************************************
|
||||
* __________ __ ___.
|
||||
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
||||
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
||||
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
||||
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
||||
* \/ \/ \/ \/ \/
|
||||
* $Id$
|
||||
*
|
||||
* Copyright (C) 2005 Dave Chapman
|
||||
*
|
||||
* All files in this archive are subject to the GNU General Public License.
|
||||
* See the file COPYING in the source tree root for full license agreement.
|
||||
*
|
||||
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
||||
* KIND, either express or implied.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
/* A test program for the Rockbox version of the ffmpeg FLAC decoder.
|
||||
|
||||
Compile using Makefile.test - run it as "./test file.flac" to decode the
|
||||
FLAC file to the file "test.wav" in the current directory
|
||||
|
||||
This test program should support 16-bit and 24-bit mono and stereo files.
|
||||
|
||||
The resulting "test.wav" should have the same md5sum as a WAV file created
|
||||
by the official FLAC decoder (it produces the same 44-byte canonical WAV
|
||||
header.
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <inttypes.h>
|
||||
#include <stdbool.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
|
||||
#include "decoder.h"
|
||||
|
||||
static unsigned char wav_header[44]={
|
||||
'R','I','F','F',// 0 - ChunkID
|
||||
0,0,0,0, // 4 - ChunkSize (filesize-8)
|
||||
'W','A','V','E',// 8 - Format
|
||||
'f','m','t',' ',// 12 - SubChunkID
|
||||
16,0,0,0, // 16 - SubChunk1ID // 16 for PCM
|
||||
1,0, // 20 - AudioFormat (1=Uncompressed)
|
||||
2,0, // 22 - NumChannels
|
||||
0,0,0,0, // 24 - SampleRate in Hz
|
||||
0,0,0,0, // 28 - Byte Rate (SampleRate*NumChannels*(BitsPerSample/8)
|
||||
4,0, // 32 - BlockAlign (== NumChannels * BitsPerSample/8)
|
||||
16,0, // 34 - BitsPerSample
|
||||
'd','a','t','a',// 36 - Subchunk2ID
|
||||
0,0,0,0 // 40 - Subchunk2Size
|
||||
};
|
||||
|
||||
int open_wav(char* filename) {
|
||||
int fd;
|
||||
|
||||
fd=open(filename,O_CREAT|O_WRONLY|O_TRUNC,S_IRUSR|S_IWUSR);
|
||||
if (fd >= 0) {
|
||||
write(fd,wav_header,sizeof(wav_header));
|
||||
}
|
||||
return(fd);
|
||||
}
|
||||
|
||||
void close_wav(int fd, FLACContext* fc) {
|
||||
int x;
|
||||
int filesize;
|
||||
int bytespersample;
|
||||
|
||||
bytespersample=fc->bps/8;
|
||||
|
||||
filesize=fc->totalsamples*bytespersample*fc->channels+44;
|
||||
|
||||
// ChunkSize
|
||||
x=filesize-8;
|
||||
wav_header[4]=(x&0xff);
|
||||
wav_header[5]=(x&0xff00)>>8;
|
||||
wav_header[6]=(x&0xff0000)>>16;
|
||||
wav_header[7]=(x&0xff000000)>>24;
|
||||
|
||||
// Number of channels
|
||||
wav_header[22]=fc->channels;
|
||||
|
||||
// Samplerate
|
||||
wav_header[24]=fc->samplerate&0xff;
|
||||
wav_header[25]=(fc->samplerate&0xff00)>>8;
|
||||
wav_header[26]=(fc->samplerate&0xff0000)>>16;
|
||||
wav_header[27]=(fc->samplerate&0xff000000)>>24;
|
||||
|
||||
// ByteRate
|
||||
x=fc->samplerate*(fc->bps/8)*fc->channels;
|
||||
wav_header[28]=(x&0xff);
|
||||
wav_header[29]=(x&0xff00)>>8;
|
||||
wav_header[30]=(x&0xff0000)>>16;
|
||||
wav_header[31]=(x&0xff000000)>>24;
|
||||
|
||||
// BlockAlign
|
||||
wav_header[32]=(fc->bps/8)*fc->channels;
|
||||
|
||||
// Bits per sample
|
||||
wav_header[34]=fc->bps;
|
||||
|
||||
// Subchunk2Size
|
||||
x=filesize-44;
|
||||
wav_header[40]=(x&0xff);
|
||||
wav_header[41]=(x&0xff00)>>8;
|
||||
wav_header[42]=(x&0xff0000)>>16;
|
||||
wav_header[43]=(x&0xff000000)>>24;
|
||||
|
||||
lseek(fd,0,SEEK_SET);
|
||||
write(fd,wav_header,sizeof(wav_header));
|
||||
close(fd);
|
||||
}
|
||||
|
||||
static void dump_headers(FLACContext *s)
|
||||
{
|
||||
fprintf(stderr," Blocksize: %d .. %d\n", s->min_blocksize,
|
||||
s->max_blocksize);
|
||||
fprintf(stderr," Framesize: %d .. %d\n", s->min_framesize,
|
||||
s->max_framesize);
|
||||
fprintf(stderr," Samplerate: %d\n", s->samplerate);
|
||||
fprintf(stderr," Channels: %d\n", s->channels);
|
||||
fprintf(stderr," Bits per sample: %d\n", s->bps);
|
||||
fprintf(stderr," Metadata length: %d\n", s->metadatalength);
|
||||
fprintf(stderr," Total Samples: %lu\n",s->totalsamples);
|
||||
fprintf(stderr," Duration: %d ms\n",s->length);
|
||||
fprintf(stderr," Bitrate: %d kbps\n",s->bitrate);
|
||||
}
|
||||
|
||||
static bool flac_init(int fd, FLACContext* fc)
|
||||
{
|
||||
unsigned char buf[255];
|
||||
struct stat statbuf;
|
||||
bool found_streaminfo=false;
|
||||
int endofmetadata=0;
|
||||
int blocklength;
|
||||
|
||||
if (lseek(fd, 0, SEEK_SET) < 0)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
if (read(fd, buf, 4) < 4)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
if (memcmp(buf,"fLaC",4) != 0)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
fc->metadatalength = 4;
|
||||
|
||||
while (!endofmetadata) {
|
||||
if (read(fd, buf, 4) < 4)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
endofmetadata=(buf[0]&0x80);
|
||||
blocklength = (buf[1] << 16) | (buf[2] << 8) | buf[3];
|
||||
fc->metadatalength+=blocklength+4;
|
||||
|
||||
if ((buf[0] & 0x7f) == 0) /* 0 is the STREAMINFO block */
|
||||
{
|
||||
/* FIXME: Don't trust the value of blocklength */
|
||||
if (read(fd, buf, blocklength) < 0)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
fstat(fd,&statbuf);
|
||||
fc->filesize = statbuf.st_size;
|
||||
fc->min_blocksize = (buf[0] << 8) | buf[1];
|
||||
fc->max_blocksize = (buf[2] << 8) | buf[3];
|
||||
fc->min_framesize = (buf[4] << 16) | (buf[5] << 8) | buf[6];
|
||||
fc->max_framesize = (buf[7] << 16) | (buf[8] << 8) | buf[9];
|
||||
fc->samplerate = (buf[10] << 12) | (buf[11] << 4)
|
||||
| ((buf[12] & 0xf0) >> 4);
|
||||
fc->channels = ((buf[12]&0x0e)>>1) + 1;
|
||||
fc->bps = (((buf[12]&0x01) << 4) | ((buf[13]&0xf0)>>4) ) + 1;
|
||||
|
||||
/* totalsamples is a 36-bit field, but we assume <= 32 bits are
|
||||
used */
|
||||
fc->totalsamples = (buf[14] << 24) | (buf[15] << 16)
|
||||
| (buf[16] << 8) | buf[17];
|
||||
|
||||
/* Calculate track length (in ms) and estimate the bitrate
|
||||
(in kbit/s) */
|
||||
fc->length = (fc->totalsamples / fc->samplerate) * 1000;
|
||||
|
||||
found_streaminfo=true;
|
||||
} else if ((buf[0] & 0x7f) == 3) { /* 3 is the SEEKTABLE block */
|
||||
fprintf(stderr,"Seektable length = %d bytes\n",blocklength);
|
||||
if (lseek(fd, blocklength, SEEK_CUR) < 0) {
|
||||
return false;
|
||||
}
|
||||
} else {
|
||||
/* Skip to next metadata block */
|
||||
if (lseek(fd, blocklength, SEEK_CUR) < 0)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (found_streaminfo) {
|
||||
fc->bitrate = ((fc->filesize-fc->metadatalength) * 8) / fc->length;
|
||||
return true;
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
/* Dummy function needed to pass to flac_decode_frame() */
|
||||
void yield() {
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[]) {
|
||||
FLACContext fc;
|
||||
int fd,fdout;
|
||||
int n;
|
||||
int i;
|
||||
int bytesleft;
|
||||
int consumed;
|
||||
char buf[MAX_FRAMESIZE]; /* The input buffer */
|
||||
/* The output buffers containing the decoded samples (channels 0 and 1) */
|
||||
int32_t decoded0[MAX_BLOCKSIZE];
|
||||
int32_t decoded1[MAX_BLOCKSIZE];
|
||||
|
||||
/* For testing */
|
||||
int8_t wavbuf[MAX_CHANNELS*MAX_BLOCKSIZE*3];
|
||||
int8_t* p;
|
||||
int scale;
|
||||
|
||||
fd=open(argv[1],O_RDONLY);
|
||||
|
||||
if (fd < 0) {
|
||||
fprintf(stderr,"Can not parse %s\n",argv[1]);
|
||||
return(1);
|
||||
}
|
||||
|
||||
/* Read the metadata and position the file pointer at the start of the
|
||||
first audio frame */
|
||||
flac_init(fd,&fc);
|
||||
|
||||
dump_headers(&fc);
|
||||
|
||||
fdout=open_wav("test.wav");
|
||||
bytesleft=read(fd,buf,sizeof(buf));
|
||||
while (bytesleft) {
|
||||
if(flac_decode_frame(&fc,decoded0,decoded1,buf,bytesleft,yield) < 0) {
|
||||
fprintf(stderr,"DECODE ERROR, ABORTING\n");
|
||||
break;
|
||||
}
|
||||
consumed=fc.gb.index/8;
|
||||
|
||||
scale=FLAC_OUTPUT_DEPTH-fc.bps;
|
||||
p=wavbuf;
|
||||
for (i=0;i<fc.blocksize;i++) {
|
||||
/* Left sample */
|
||||
decoded0[i]=decoded0[i]>>scale;
|
||||
*(p++)=decoded0[i]&0xff;
|
||||
*(p++)=(decoded0[i]&0xff00)>>8;
|
||||
if (fc.bps==24) *(p++)=(decoded0[i]&0xff0000)>>16;
|
||||
|
||||
if (fc.channels==2) {
|
||||
/* Right sample */
|
||||
decoded1[i]=decoded1[i]>>scale;
|
||||
*(p++)=decoded1[i]&0xff;
|
||||
*(p++)=(decoded1[i]&0xff00)>>8;
|
||||
if (fc.bps==24) *(p++)=(decoded1[i]&0xff0000)>>16;
|
||||
}
|
||||
}
|
||||
write(fdout,wavbuf,fc.blocksize*fc.channels*(fc.bps/8));
|
||||
|
||||
memmove(buf,&buf[consumed],bytesleft-consumed);
|
||||
bytesleft-=consumed;
|
||||
|
||||
n=read(fd,&buf[bytesleft],sizeof(buf)-bytesleft);
|
||||
if (n > 0) {
|
||||
bytesleft+=n;
|
||||
}
|
||||
}
|
||||
close_wav(fdout,&fc);
|
||||
close(fd);
|
||||
return(0);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue