diff options
Diffstat (limited to 'ac32spdif.c')
| -rwxr-xr-x | ac32spdif.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/ac32spdif.c b/ac32spdif.c new file mode 100755 index 0000000..a1ab79f --- /dev/null +++ b/ac32spdif.c @@ -0,0 +1,182 @@ +
+#include <stdio.h>
+//#include <stdlib.h>
+//#include <string.h>
+#include <memory.h>
+
+//#include "fs_codes.h"
+
+
+short bitrates[] = { 32, 40, 48, 56, 64, 80, 96, 112, 128, 160,
+192, 224, 256, 320, 384, 448, 512, 576, 640 };
+
+short fsize44[] = { 70, 88, 105, 122, 140, 175, 209, 244, 279, 349,
+418, 488, 558, 697, 836, 976, 1115, 1254, 1394 };
+
+unsigned long DecFS(char sratecode, unsigned long fsizecode)
+{
+ switch (sratecode)
+ {
+ case 0:
+ return (bitrates[fsizecode / 2] * 2);
+ case 1:
+ return ((fsizecode % 2) ? fsize44[fsizecode / 2] : fsize44[fsizecode / 2] - 1);
+ case 2:
+ return (bitrates[fsizecode / 2] * 3);
+ default:
+ return 0;
+ }
+
+ return 0;
+}
+
+
+
+
+struct WAVEHEADER {
+ unsigned long ChunkID;
+ unsigned long ChunkSize;
+ unsigned long Format;
+ unsigned long SubChunk1ID;
+ unsigned long SubChunk1Size;
+ unsigned short AudioFormat;
+ unsigned short NumChannels;
+ unsigned long SampleRate;
+ unsigned long ByteRate;
+ unsigned short BlockAlign;
+ unsigned short BitsPerSample;
+ unsigned long SubChunk2ID;
+ unsigned long SubChunk2Size;
+};
+
+
+struct AC3PREAMBLE {
+ unsigned short sync1;
+ unsigned short sync2;
+ unsigned char burst_infoLSB;
+ unsigned char burst_infoMSB;
+ unsigned short lengthcode;
+};
+
+char burst[6144];
+
+FILE *infile, *outfile;
+
+unsigned long bytesread;
+unsigned long payloadbytes;
+char sampleratecode;
+unsigned long framesizecode;
+
+struct AC3PREAMBLE ac3p = { 0xF872, 0x4E1F, 1, 0, 0x3800 };
+struct WAVEHEADER wavhdr = { 0x46464952,
+ 0,
+ 0x45564157,
+ 0x20746D66,
+ 16,
+ 1,
+ 2,
+ 0,
+ 0,
+ 4,
+ 16,
+ 0x61746164,
+ 0 };
+
+unsigned long i;
+char temp;
+
+int main( int argc, char *argv[ ], char *envp[ ] )
+{
+ if (argc < 3)
+ {
+ printf("Wrong syntax. AC3PACK <In.ac3> <Out.wav>.\n");
+ return 0;
+ }
+
+ infile = fopen(argv[1], "rb");
+ outfile = fopen(argv[2], "wb");
+ //fseek(outfile, SEEK_SET, 44);
+ fwrite (&wavhdr, sizeof(struct WAVEHEADER), 1, outfile);
+
+
+
+ for(;;)
+ {
+ memset (burst, 0, 6144);
+ bytesread = fread(&burst[8], 1, 6, infile);
+ if (bytesread < 6)
+ {
+ printf ("EOF reached (Frame Header reading)!\nCurrent position in INFILE: %i\n", ftell(infile));
+ break;
+ }
+ if ((burst[8] != 0x0B) || (burst[9] != 0x77))
+ {
+ printf("ERROR: INVALID SYNCWORD !\nCurrent position in INFILE: %i\n", ftell(infile));
+ break;
+ }
+ framesizecode = (burst[12] & 63);
+ sampleratecode = ((burst[12] & 192) / 64);
+
+ if (wavhdr.SampleRate == 0)
+ {
+ printf ("First Sampleratecode: %i\n", sampleratecode);
+
+ switch (sampleratecode)
+ {
+ case 0:
+ wavhdr.SampleRate = 48000;
+ wavhdr.ByteRate = 192000;
+ break;
+ case 1:
+ wavhdr.SampleRate = 44100;
+ wavhdr.ByteRate = 176000;
+ break;
+ case 2:
+ wavhdr.SampleRate = 32000;
+ wavhdr.ByteRate = 128000;
+ break;
+ default:
+ wavhdr.SampleRate = 48000;
+ wavhdr.ByteRate = 192000;
+ }
+ }
+
+ payloadbytes = DecFS (sampleratecode, framesizecode);
+ payloadbytes *= 2;
+
+ bytesread = fread (&burst[14], 1, payloadbytes - 6, infile);
+ if ((bytesread + 6) < payloadbytes)
+ {
+ printf ("EOF reached (Burst Reading)!\nCurrent position in INFILE: %i\n", ftell(infile));
+ printf ("Frame size: %i .. Bytes read: %i\n", payloadbytes, bytesread);
+ break;
+ }
+ ac3p.burst_infoMSB = (burst[13] & 7);
+ ac3p.lengthcode = (short)(payloadbytes * 8);
+
+ for (i = 8; i < (payloadbytes + 8); i += 2)
+ {
+ temp = burst[i];
+ burst[i] = burst[i + 1];
+ burst[i + 1] = temp;
+ }
+
+ memcpy (burst, &ac3p, sizeof(struct AC3PREAMBLE));
+
+ fwrite (burst, 1, 6144, outfile);
+
+ }
+
+ printf ("Last Sampleratecode: %i\n", sampleratecode);
+
+ wavhdr.SubChunk2Size = (ftell(outfile) - 44);
+ wavhdr.ChunkSize = wavhdr.SubChunk2Size + 36;
+
+ fseek (outfile, SEEK_SET, 0);
+ fwrite (&wavhdr, sizeof(struct WAVEHEADER), 1, outfile);
+
+ fclose (infile);
+ fclose (outfile);
+
+ return 0;
+}
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