112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
#include "meta.h"
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#include "../layout/layout.h"
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#include "../coding/coding.h"
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/* H4M - from Hudson HVQM4 videos [Resident Evil 0 (GC), Tales of Symphonia (GC)]
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* (info from hcs/Nisto's h4m_audio_decode) */
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VGMSTREAM* init_vgmstream_h4m(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset;
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int loop_flag, channel_count;
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int format, extra_tracks, sample_rate;
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int total_subsongs, target_subsong = sf->stream_index;
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/* checks */
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if (!is_id64be(0x00,sf, "HVQM4 1."))
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goto fail;
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if (!is_id32be(0x08,sf, "3\0\0\0") &&
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!is_id32be(0x08,sf, "5\0\0\0"))
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goto fail;
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/* checks */
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/* .h4m: common
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* .hvqm: Shrek: Extra Large (GC) */
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if (!check_extensions(sf, "h4m,hvqm"))
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goto fail;
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/* header */
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start_offset = read_u32be(0x10, sf); /* header_size */
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if (start_offset != 0x44) /* known size */
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goto fail;
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if (read_u32be(0x14, sf) != get_streamfile_size(sf) - start_offset) /* body_size */
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goto fail;
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if (read_u32be(0x18, sf) == 0) /* blocks */
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goto fail;
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/* 0x1c: video_frames */
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if (read_u32be(0x20, sf) == 0) /* audio_frames */
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goto fail;
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/* 0x24: frame interval */
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/* 0x28: max_video_frame_size */
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/* 0x2c: unk2C (0) */
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if (read_u32be(0x30, sf) == 0) /* max_audio_frame_size */
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goto fail;
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/* 0x34: hres */
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/* 0x36: vres */
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/* 0x38: h_srate */
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/* 0x39: v_srate */
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/* 0x3a: unk3A (0 or 0x12) */
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/* 0x3b: unk3B (0) */
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channel_count = read_u8(0x3c,sf);
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if (read_u8(0x3d,sf) != 16) /* bitdepth */
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goto fail; //todo Pikmin (GC) is using some kind of variable blocks
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format = read_u8(0x3e,sf); /* flags? */
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extra_tracks = read_u8(0x3f,sf);
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sample_rate = read_s32be(0x40,sf);
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loop_flag = 0;
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/* tracks for languages [Pokemon Channel], or sometimes used to fake multichannel [Tales of Symphonia] */
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total_subsongs = extra_tracks + 1;
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if (target_subsong == 0) target_subsong = 1;
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if (target_subsong < 0 || target_subsong > total_subsongs || total_subsongs < 1) goto fail;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channel_count, loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_streams = total_subsongs;
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vgmstream->stream_size = get_streamfile_size(sf) / total_subsongs; /* approx... */
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vgmstream->codec_config = format; /* for blocks */
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vgmstream->meta_type = meta_H4M;
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vgmstream->layout_type = layout_blocked_h4m;
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switch(format & 0x7F) {
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case 0x00:
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vgmstream->coding_type = coding_H4M_IMA;
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break;
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/* no games known to use these, h4m_audio_decode may decode them */
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case 0x01: /* Uncompressed PCM */
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case 0x04: /* 8-bit (A)DPCM */
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default:
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VGM_LOG("H4M: unknown codec %x\n", format);
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goto fail;
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}
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if (!vgmstream_open_stream(vgmstream,sf,start_offset))
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goto fail;
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/* calc num_samples manually */
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{
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vgmstream->stream_index = target_subsong; /* extra setup for H4M */
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vgmstream->full_block_size = 0; /* extra setup for H4M */
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vgmstream->next_block_offset = start_offset;
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do {
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block_update(vgmstream->next_block_offset,vgmstream);
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vgmstream->num_samples += vgmstream->current_block_samples;
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}
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while (vgmstream->next_block_offset < get_streamfile_size(sf));
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vgmstream->full_block_size = 0; /* extra cleanup for H4M */
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block_update(start_offset, vgmstream);
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}
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return vgmstream;
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fail:
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close_vgmstream(vgmstream);
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return NULL;
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}
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