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https://github.com/vgmstream/vgmstream.git
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113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
#include "meta.h"
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#include "../layout/layout.h"
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#include "../util.h"
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/* Westwood Studios .aud (WS-AUD) */
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VGMSTREAM* init_vgmstream_ws_aud(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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coding_t coding_type = -1;
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off_t format_offset;
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int channels;
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bool new_type = false;
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int bytes_per_sample = 0;
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/* checks **/
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if (!check_extensions(sf, "aud") )
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return NULL;
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/* check for 0x0000DEAF chunk marker for first chunk */
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if (read_u32le(0x10,sf) == 0x0000DEAF) { /* new */
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new_type = true;
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format_offset = 0x0A;
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}
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else if (read_u32le(0x0C,sf) == 0x0000DEAF) { /* old */
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new_type = false;
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format_offset = 0x06;
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}
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else {
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return NULL;
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}
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/* blocked format with a mini-header */
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if (read_u8(format_offset + 0x00, sf) & 1)
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channels = 2;
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else
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channels = 1;
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if (channels == 2)
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goto fail; /* not seen */
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if (read_u8(format_offset + 0x01,sf) & 2)
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bytes_per_sample = 2;
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else
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bytes_per_sample = 1;
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/* check codec type */
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switch (read_u8(format_offset + 0x01,sf)) {
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case 1: /* Westwood custom */
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coding_type = coding_WS;
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if (bytes_per_sample != 1) goto fail; /* shouldn't happen? */
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break;
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case 99: /* IMA ADPCM */
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coding_type = coding_IMA_int;
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break;
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default:
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goto fail;
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}
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, 0);
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if (!vgmstream) goto fail;
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if (new_type) {
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vgmstream->num_samples = read_32bitLE(0x06,sf)/bytes_per_sample/channels;
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}
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else {
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/* Doh, no output size in old type files. We have to read through the
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* file looking at chunk headers! Crap! */
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int32_t out_size = 0;
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off_t current_offset = 0x8;
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off_t file_size = get_streamfile_size(sf);
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while (current_offset < file_size) {
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int16_t chunk_size;
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chunk_size = read_16bitLE(current_offset,sf);
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out_size += read_16bitLE(current_offset+2,sf);
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/* while we're here might as well check for valid chunks */
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if (read_32bitLE(current_offset+4,sf) != 0x0000DEAF) goto fail;
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current_offset+=8+chunk_size;
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}
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vgmstream->num_samples = out_size/bytes_per_sample/channels;
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}
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/* they tend to not actually have data for the last odd sample */
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if (vgmstream->num_samples & 1) vgmstream->num_samples--;
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vgmstream->sample_rate = (uint16_t)read_16bitLE(0x00,sf);
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vgmstream->coding_type = coding_type;
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if (new_type) {
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vgmstream->meta_type = meta_WS_AUD;
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}
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vgmstream->layout_type = layout_blocked_ws_aud;
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if (!vgmstream_open_stream(vgmstream, sf, 0x00) )
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goto fail;
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if (new_type) {
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block_update(0x0c, vgmstream);
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} else {
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block_update(0x08, vgmstream);
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}
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return vgmstream;
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fail:
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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