summaryrefslogtreecommitdiffstats
path: root/apps/codecs/libffmpegFLAC/main.c
blob: e6d4b2f4fdb66023c8771474cd4259a57843c100 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 Dave Chapman
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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 <stdlib.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) {
        if (write(fd,wav_header,sizeof(wav_header)) < sizeof(wav_header)) {
            fprintf(stderr,"[ERR}  Failed to write wav header\n");
            exit(1);
        }
    }
    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);
    if (write(fd,wav_header,sizeof(wav_header)) < sizeof(wav_header)) {
        fprintf(stderr,"[ERR}  Failed to write wav header\n");
        exit(1);
    }
    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;
    uint32_t* p;
    uint32_t seekpoint_lo,seekpoint_hi;
    uint32_t offset_lo,offset_hi;
    int n;

    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);
            while (blocklength >= 18) {
                n=read(fd,buf,18);
                if (n < 18) return false;
                blocklength-=n;

                p=(uint32_t*)buf;
                seekpoint_hi=betoh32(*(p++));
                seekpoint_lo=betoh32(*(p++));
                offset_hi=betoh32(*(p++));
                offset_lo=betoh32(*(p++));
            
                if ((seekpoint_hi != 0xffffffff) && (seekpoint_lo != 0xffffffff)) {
          fprintf(stderr,"Seekpoint: %u, Offset=%u\n",seekpoint_lo,offset_lo);
                }
            }
            lseek(fd, blocklength, SEEK_CUR);
        } 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;
    unsigned 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;
             }
        }
        n = fc.blocksize*fc.channels*(fc.bps/8);
        if (write(fdout,wavbuf,n) < n) {
            fprintf(stderr,"[ERR] Write failed\n");
            exit(1);
        }

        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);
}