/* --------------------------------------------------------------------------*/
void audio_start(void **priv)
{
audio_decode_init(priv);
audio_decode_start(*priv);
}
/* Open an MPEG stream and prepare for decode */
static int xing_init(const char *fn) {
uint32 fd;
/* Open the file */
mp3_fd = fd = fs_open(fn, O_RDONLY);
if (fd < 0) {
printf("Can't open input file %s\r\n", fn);
printf("getwd() returns '%s'\r\n", fs_getwd());
return -1;
}
if (fn != mp3_last_fn) {
if (fn[0] != '/') {
strcpy(mp3_last_fn, fs_getwd());
strcat(mp3_last_fn, "/");
strcat(mp3_last_fn, fn);
} else {
strcpy(mp3_last_fn, fn);
}
}
/* Allocate buffers */
if (bs_buffer == NULL)
bs_buffer = malloc(BS_SIZE);
bs_ptr = bs_buffer; bs_count = 0;
if (pcm_buffer == NULL)
pcm_buffer = malloc(PCM_SIZE);
pcm_ptr = pcm_buffer; pcm_count = pcm_discard = 0;
/* Fill bitstream buffer */
if (bs_fill() < 0) {
printf("Can't read file header\r\n");
goto errorout;
}
/* Are we looking at a RIFF file? (stupid Windows encoders) */
if (bs_ptr[0] == 'R' && bs_ptr[1] == 'I' && bs_ptr[2] == 'F' && bs_ptr[3] == 'F') {
/* Found a RIFF header, scan through it until we find the data section */
printf("Skipping stupid RIFF header\r\n");
while (bs_ptr[0] != 'd' || bs_ptr[1] != 'a' || bs_ptr[2] != 't' || bs_ptr[3] != 'a') {
bs_ptr++;
if (bs_ptr >= (bs_buffer + BS_SIZE)) {
printf("Indeterminately long RIFF header\r\n");
goto errorout;
}
}
/* Skip 'data' and length */
bs_ptr += 8;
bs_count -= (bs_ptr - bs_buffer);
printf("Final index is %d\r\n", (bs_ptr - bs_buffer));
}
if (((uint8)bs_ptr[0] != 0xff) && (!((uint8)bs_ptr[1] & 0xe0))) {
printf("Definitely not an MPEG file\r\n");
goto errorout;
}
/* Initialize MPEG engines */
mpeg_init(&mpeg);
mpeg_eq_init(&mpeg);
/* Parse MPEG header */
frame_bytes = head_info2(bs_ptr, bs_count, &head, &bitrate);
if (frame_bytes == 0) {
printf("Bad or unsupported MPEG file\r\n");
goto errorout;
}
/* Print out some info about it */
{
static char *layers[] = { "invalid", "3", "2", "1" };
static char *modes[] = { "stereo", "joint-stereo", "dual", "mono" };
static int srs[] = { 22050, 24000, 16000, 1, 44100, 48000, 32000, 1 };
printf("Opened stream %s for decoding:\r\n", fn);
printf(" %dKbps Layer %s %s at %dHz\r\n",
bitrate/1000, layers[head.option], modes[head.mode],
srs[4*head.id + head.sr_index]);
}
/* Initialize audio decoder */
if (!audio_decode_init(&mpeg, &head, frame_bytes,
REDUCT_NORMAL, 0, CONV_NORMAL, 44100)) {
printf("Failed to initialize decoder\r\n");
goto errorout;
}
audio_decode_info(&mpeg, &decinfo);
printf("Output Sampling rate = %ld\r\n", decinfo.samprate);
printf("Output Channels = %d\r\n", decinfo.channels);
printf("Output Bits = %d\r\n", decinfo.bits);
printf("Output Type = %d\r\n", decinfo.type);
/* if (decinfo.samprate != 44100) {
printf("Currently cannot process %ld sampling rate\r\n", decinfo.samprate);
goto errorout;
} */
printf("XingMP3 initialized successfully\r\n");
return 0;
errorout:
printf("Exiting on error\r\n");
if (bs_buffer) {
free(bs_buffer);
bs_buffer = NULL;
}
if (pcm_buffer) {
free(pcm_buffer);
pcm_buffer = NULL;
}
fs_close(fd);
mp3_fd = 0;
return -1;
}
