#include "meta.h" #include "../coding/coding.h" static int get_ogg_page_size(STREAMFILE* sf, off_t page_offset, off_t *out_data_offset, size_t *out_page_size); static int ogg_get_num_samples(STREAMFILE* sf, off_t start_offset); /* Ogg Opus - standard Opus with optional looping comments [The Pillars of Earth (PC), Monster Boy and the Cursed Kingdom (Switch)] */ VGMSTREAM* init_vgmstream_ogg_opus(STREAMFILE* sf) { VGMSTREAM* vgmstream = NULL; off_t start_offset, data_offset = 0; size_t page_size = 0; int loop_flag, channel_count, original_rate; int loop_start = 0, loop_end = 0; /* checks */ if (!is_id32be(0x00,sf, "OggS")) goto fail; /* .opus: standard, .lopus: fake extension for plugins * .ogg: less common, .logg: same * .bgm: Utawarerumono: Mask of Truth (PC) */ if (!check_extensions(sf, "opus,lopus,ogg,logg,bgm")) goto fail; /* see: https://tools.ietf.org/html/rfc7845.html */ start_offset = 0x00; /* parse 1st page: opus head */ if (!get_ogg_page_size(sf, start_offset, &data_offset, &page_size)) goto fail; if (!is_id32be(data_offset+0x00,sf, "Opus") || !is_id32be(data_offset+0x04,sf, "Head")) goto fail; /* 0x01: version 1, fixed */ channel_count = read_u8(data_offset+0x09,sf); /* 0x0A: skip samples */ original_rate = read_s32le(data_offset+0x0c,sf); /* 0x10: gain */ /* 0x12: mapping family */ /* parse 2nd page: opus tags (also mandatory) */ if (!get_ogg_page_size(sf, start_offset+page_size, &data_offset, &page_size)) goto fail; if (!is_id32be(data_offset+0x00,sf, "Opus") || !is_id32be(data_offset+0x04,sf, "Tags")) goto fail; loop_flag = 0; { char user_comment[1024+1]; off_t offset; int vendor_size, comment_count, user_comment_size, user_comment_max; int i; int has_encoder_options = 0, has_title = 0; vendor_size = read_s32le(data_offset+0x08,sf); comment_count = read_s32le(data_offset+0x0c+vendor_size,sf); /* parse comments */ offset = data_offset + 0x0c + vendor_size + 0x04; for (i = 0; i < comment_count; i++) { user_comment_size = read_s32le(offset+0x00,sf); user_comment_max = user_comment_size > 1024 ? 1024 : user_comment_size; read_string(user_comment,user_comment_max+1, offset+0x04,sf); /* parse loop strings */ if (strstr(user_comment,"LOOP_START=")==user_comment) { /* Monster Boy and the Cursed Kingdom (Switch) */ loop_start = atol(strrchr(user_comment,'=')+1); loop_flag = (loop_start >= 0); } else if (strstr(user_comment,"LOOP_END=")==user_comment) { /* LOOP_START pair */ loop_end = atol(strrchr(user_comment,'=')+1); } else if (strstr(user_comment,"ENCODER_OPTIONS=")==user_comment) { /* for detection */ has_encoder_options = 1; } else if (strstr(user_comment,"TITLE=")==user_comment) { /* for detection */ has_title = 1; } else if (strstr(user_comment,"LoopStart=")==user_comment) { /* Utawarerumono: Mask of Truth (PC) */ loop_start= atol(strrchr(user_comment,'=')+1); loop_flag = (loop_start >= 0); } else if (strstr(user_comment,"LoopEnd=")==user_comment) { /* LoopStart pair */ loop_end = atol(strrchr(user_comment,'=')+1); } else if (strstr(user_comment, "loops=") == user_comment) { /* The Legend of Heroes: Trails of Cold Steel III (Switch) */ sscanf(strrchr(user_comment, '=') + 1, "%d-%d", &loop_start, &loop_end); loop_flag = 1; } //;VGM_LOG("OggOpus: user_comment=%s\n", user_comment); offset += 0x04 + user_comment_size; } /* Monster Boy has loop points for 44100hz (what), but Opus is resampled so * they must be adjusted (with extra checks just in case). */ if (loop_flag && original_rate < 48000 && has_encoder_options && has_title) { float modifier = 48000.0f / (float)original_rate; loop_start = loop_start * modifier; loop_end = loop_end * modifier; } } /* build the VGMSTREAM */ vgmstream = allocate_vgmstream(channel_count, loop_flag); if (!vgmstream) goto fail; vgmstream->meta_type = meta_OGG_OPUS; vgmstream->sample_rate = 48000; /* Opus always resamples to this */ vgmstream->num_samples = ogg_get_num_samples(sf, 0x00); vgmstream->loop_start_sample = loop_start; vgmstream->loop_end_sample = loop_end; #ifdef VGM_USE_FFMPEG { vgmstream->codec_data = init_ffmpeg_offset(sf, start_offset, get_streamfile_size(sf)); if (!vgmstream->codec_data) goto fail; vgmstream->coding_type = coding_FFmpeg; vgmstream->layout_type = layout_none; vgmstream->channel_layout = ffmpeg_get_channel_layout(vgmstream->codec_data); /* FFmpeg+libopus handles skip samples ok, FFmpeg+opus doesn't */ } #else goto fail; #endif if (!vgmstream_open_stream(vgmstream,sf,start_offset)) goto fail; return vgmstream; fail: close_vgmstream(vgmstream); return NULL; } /* parse OggS's bizarre segment table */ static int get_ogg_page_size(STREAMFILE* sf, off_t page_offset, off_t* p_data_offset, size_t* p_page_size) { uint8_t segments; size_t page_size = 0; int i; if (!is_id32be(page_offset+0x00,sf, "OggS")) goto fail; /* read all segment sizes */ segments = read_u8(page_offset+0x1a, sf); for (i = 0; i < segments; i++) { page_size += read_u8(page_offset + 0x1b + i, sf); } page_size += 0x1b + segments; if (p_data_offset) *p_data_offset = page_offset + 0x1b + segments; if (p_page_size) *p_page_size = page_size; return 1; fail: return 0; } /* Ogg doesn't have num_samples info, must manually seek+read last granule * (Xiph is insistent this is the One True Way). */ static int ogg_get_num_samples(STREAMFILE *sf, off_t start_offset) { uint32_t expected_id = get_id32be("OggS"); off_t offset = get_streamfile_size(sf) - 0x04-0x01-0x01-0x08-0x04-0x04-0x04; //todo better buffer reads (Ogg page max is 0xFFFF) //lame way to force buffer, assuming it's around that read_u32be(offset - 0x4000, sf); while (offset >= start_offset) { uint32_t current_id = read_u32be(offset, sf); if (current_id == expected_id) { /* if more checks are needed last page starts with 0x0004 */ return read_s32le(offset+0x04+0x01+0x01, sf); /* get last granule = total samples (64b but whatevs) */ } offset--; } return 0; }