static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels) {
STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
bgw_decryption_data io_data = {0};
size_t io_data_size = sizeof(bgw_decryption_data);
int ch;
/* setup decryption with key (first frame + modified channel header) */
if (frame_size*channels == 0 || frame_size*channels > BGW_KEY_MAX) goto fail;
io_data.key_size = read_streamfile(io_data.key, subfile_offset, frame_size*channels, streamFile);
for (ch = 0; ch < channels; ch++) {
uint32_t xor = get_32bitBE(io_data.key + frame_size*ch);
put_32bitBE(io_data.key + frame_size*ch, xor ^ 0xA0024E9F);
}
/* setup subfile */
new_streamFile = open_wrap_streamfile(streamFile);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_io_streamfile(temp_streamFile, &io_data,io_data_size, bgw_decryption_read,NULL);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
return temp_streamFile;
fail:
close_streamfile(temp_streamFile);
return NULL;
}
/* Prepares custom IO for custom Opus, that is converted to Ogg Opus on the fly */
static STREAMFILE* setup_opus_streamfile(STREAMFILE *streamFile, int channels, int skip, int sample_rate, off_t stream_offset, size_t stream_size, opus_type_t type) {
STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
opus_io_data io_data = {0};
size_t io_data_size = sizeof(opus_io_data);
io_data.type = type;
io_data.stream_offset = stream_offset;
io_data.stream_size = stream_size;
io_data.physical_offset = stream_offset;
io_data.head_size = make_oggs_first(io_data.head_buffer, sizeof(io_data.head_buffer), channels, skip, sample_rate);
if (!io_data.head_size) goto fail;
io_data.sequence = 2;
io_data.logical_size = opus_io_size(streamFile, &io_data); /* force init */
/* setup subfile */
new_streamFile = open_wrap_streamfile(streamFile);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_io_streamfile(temp_streamFile, &io_data,io_data_size, opus_io_read,opus_io_size);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_buffer_streamfile(new_streamFile,0);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
return temp_streamFile;
fail:
close_streamfile(temp_streamFile);
return NULL;
}
static STREAMFILE *io_open(IO_STREAMFILE *streamfile, const char * const filename, size_t buffersize) {
//todo should have some flag to decide if opening other files with IO
STREAMFILE *new_inner_sf = streamfile->inner_sf->open(streamfile->inner_sf,filename,buffersize);
return open_io_streamfile(new_inner_sf, streamfile->data, streamfile->data_size, streamfile->read_callback, streamfile->size_callback);
}
