#include "meta.h" #include "../coding/coding.h" /* .STR - Sega Dreamcast's "Audio64 AM (AICA Manager) driver" streams */ VGMSTREAM* init_vgmstream_str_sega(STREAMFILE* sf) { VGMSTREAM* vgmstream = NULL; uint32_t start_offset, data_size; int loop_flag, channels, track_channels, tracks, sample_rate, bps, interleave, blocks; /* checks */ tracks = read_u32le(0x00,sf); if (tracks < 1 || tracks > 16) /* official limits */ return NULL; /* "Sega Stream Asset Builder Revision ..." long text with program info, after header */ if (!is_id64be(0xD4,sf, "\0Sega St")) return NULL; if (!check_extensions(sf, "str")) return NULL; sample_rate = read_s32le(0x04,sf); bps = read_u32le(0x08,sf); interleave = read_s32le(0x0C,sf); /* multiples of 0x800 (sector size) */ blocks = read_s32le(0x10,sf); /* interruptsTillEnd, "how may irqs until the end of that tracks data" AKA interleaved blocks */ /* per track info (channels must be the same per track, and data_size may be inaccurate for other tracks) */ data_size = read_u32le(0x14,sf); track_channels = read_s32le(0x18,sf); /* max 2 for AICA, N for PCM */ /* 0x08: blocks / interruptsTillEnd (not including padding) */ /* header track data reserved up to max 16 * 0x0c = 0xC0 + 0x18 = 0xD4 */ /* after track headers there may be one phantom entry with empty data/channels but repeated interruptsTillEnd (bug?) */ channels = track_channels * tracks; loop_flag = 0; /* no loop info */ start_offset = 0x800; /* all tracks/data is padded */ if (blocks * channels * interleave != get_streamfile_size(sf) - start_offset) goto fail; /* streams start with a "leadIn" silence that defaults to 2 blocks, but it's configurable */ //start_offset += (interleave * channels) * 2; vgmstream = allocate_vgmstream(channels,loop_flag); if (!vgmstream) goto fail; vgmstream->meta_type = meta_STR_SEGA; vgmstream->sample_rate = sample_rate; switch (bps) { case 4: /* common [GTA2 (DC)] */ vgmstream->coding_type = coding_AICA_int; vgmstream->num_samples = yamaha_bytes_to_samples(data_size, track_channels); for (int i = 0; i < channels; i++) { vgmstream->ch[i].adpcm_step_index = 0x7f; } break; case 8: /* not seen (encoder only) */ vgmstream->coding_type = coding_PCM8_U; vgmstream->num_samples = pcm8_bytes_to_samples(data_size, track_channels); break; case 16: /* common [San Francisco Rush 2049 (DC)] */ vgmstream->coding_type = coding_PCM16LE; vgmstream->num_samples = pcm16_bytes_to_samples(data_size, track_channels); break; default: goto fail; } vgmstream->interleave_block_size = interleave; vgmstream->layout_type = layout_interleave; if (!vgmstream_open_stream(vgmstream, sf, start_offset)) goto fail; return vgmstream; fail: close_vgmstream(vgmstream); return NULL; } /* .STR - mutant Sega Dreamcast stream [102 Dalmatians: Puppies to the Rescue (DC)] */ VGMSTREAM* init_vgmstream_str_sega_custom(STREAMFILE* sf) { VGMSTREAM* vgmstream = NULL; off_t start_offset; int loop_flag, channels, sample_rate, interleave; uint32_t data_size; /* checks */ if (read_u32le(0x00,sf) != 0x2) goto fail; if (read_u64be(0xD4,sf) != 0x00) return NULL; if (!check_extensions(sf, "str")) return NULL; /* this looks vaguely like a STR and could be a fully new thing, but game does include Audio64.drv */ loop_flag = 0; channels = 2; sample_rate = read_s32le(0x04,sf); if (read_u32le(0x08,sf) != 16) return NULL; interleave = read_s32le(0x0c,sf); if (read_u32le(0x10,sf) != 0x10000 || read_u32le(0x14,sf) != 0x00 || read_u32le(0x18,sf) != 0x00 || read_u32le(0x1C,sf) != 0x1F) return NULL; start_offset = 0x800; data_size = get_streamfile_size(sf) - start_offset; /* build the VGMSTREAM */ vgmstream = allocate_vgmstream(channels, loop_flag); if (!vgmstream) goto fail; vgmstream->meta_type = meta_STR_SEGA_custom; vgmstream->sample_rate =sample_rate; vgmstream->coding_type = coding_PCM16LE; vgmstream->num_samples = pcm16_bytes_to_samples(data_size, channels); vgmstream->layout_type = layout_interleave; vgmstream->interleave_block_size = interleave; if (!vgmstream_open_stream(vgmstream, sf, start_offset)) goto fail; return vgmstream; fail: close_vgmstream(vgmstream); return NULL; }