uint16_t stream_read_uint16(stream_t *stream)
{
uint16_t v;
stream_read(stream, 2, &v);
#ifdef ROCKBOX_LITTLE_ENDIAN
_Swap16(v);
#endif
return v;
}
static int decoder_alac_init(struct alac_decoder *alac, unsigned char *in_buffer)
{
unsigned char *ptr = in_buffer;
int i;
/* Get ALAC parameters from buffer */
ptr += 4; /* size */
ptr += 4; /* frma */
ptr += 4; /* alac */
ptr += 4; /* size */
ptr += 4; /* alac */
ptr += 4; /* 0 ? */
alac->samples_per_frame = *(uint32_t*)ptr; /* buffer size / 2 ? */
if (!host_bigendian)
_Swap32(alac->samples_per_frame);
ptr += 4;
alac->info_7a = *(uint8_t*)ptr;
ptr += 1;
alac->sample_size = *(uint8_t*)ptr;
ptr += 1;
alac->rice_historymult = *(uint8_t*)ptr;
ptr += 1;
alac->rice_initialhistory = *(uint8_t*)ptr;
ptr += 1;
alac->rice_kmodifier = *(uint8_t*)ptr;
ptr += 1;
alac->numchannels = *(uint8_t*)ptr;
ptr += 1;
alac->info_80 = *(uint16_t*)ptr;
if (!host_bigendian)
_Swap16(alac->info_80);
ptr += 2;
alac->info_82 = *(uint32_t*)ptr;
if (!host_bigendian)
_Swap32(alac->info_82);
ptr += 4;
alac->info_86 = *(uint32_t*)ptr;
if (!host_bigendian)
_Swap32(alac->info_86);
ptr += 4;
alac->samplerate = *(uint32_t*)ptr;
if (!host_bigendian)
_Swap32(alac->samplerate);
alac->bytespersample = (alac->sample_size / 8) * alac->numchannels;
/* Allocate buffers */
for(i = 0; i < 2; i++)
{
alac->predicterror_buffer[i] = malloc(alac->samples_per_frame * 4);
alac->outputsamples_buffer[i] = malloc(alac->samples_per_frame * 4);
alac->uncompressed_bytes_buffer[i] = malloc(alac->samples_per_frame * 4);
}
return 0;
}
void alac_set_info(alac_file *alac, char *inputbuffer)
{
char *ptr = inputbuffer;
ptr += 4; /* size */
ptr += 4; /* frma */
ptr += 4; /* alac */
ptr += 4; /* size */
ptr += 4; /* alac */
ptr += 4; /* 0 ? */
alac->setinfo_max_samples_per_frame = *(uint32_t*)ptr; /* buffer size / 2 ? */
if (!host_bigendian)
_Swap32(alac->setinfo_max_samples_per_frame);
ptr += 4;
alac->setinfo_7a = *(uint8_t*)ptr;
ptr += 1;
alac->setinfo_sample_size = *(uint8_t*)ptr;
ptr += 1;
alac->setinfo_rice_historymult = *(uint8_t*)ptr;
ptr += 1;
alac->setinfo_rice_initialhistory = *(uint8_t*)ptr;
ptr += 1;
alac->setinfo_rice_kmodifier = *(uint8_t*)ptr;
ptr += 1;
alac->setinfo_7f = *(uint8_t*)ptr;
ptr += 1;
alac->setinfo_80 = *(uint16_t*)ptr;
if (!host_bigendian)
_Swap16(alac->setinfo_80);
ptr += 2;
alac->setinfo_82 = *(uint32_t*)ptr;
if (!host_bigendian)
_Swap32(alac->setinfo_82);
ptr += 4;
alac->setinfo_86 = *(uint32_t*)ptr;
if (!host_bigendian)
_Swap32(alac->setinfo_86);
ptr += 4;
alac->setinfo_8a_rate = *(uint32_t*)ptr;
if (!host_bigendian)
_Swap32(alac->setinfo_8a_rate);
ptr += 4;
allocate_buffers(alac);
}
