mirror of
https://github.com/vgmstream/vgmstream.git
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100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* .WAVE - WayForward "EngineBlack" games [Mighty Switch Force! (3DS), Adventure Time: Hey Ice King! Why'd You Steal Our Garbage?! (3DS)] */
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VGMSTREAM * init_vgmstream_wave(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset, extradata_offset;
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int loop_flag = 0, channel_count, sample_rate, codec;
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int32_t num_samples, loop_start = 0, loop_end = 0;
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size_t interleave;
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int big_endian;
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int32_t (*read_32bit)(off_t,STREAMFILE*) = NULL;
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float (*read_f32)(off_t,STREAMFILE*) = NULL;
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/* checks */
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if (!check_extensions(streamFile, "wave"))
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goto fail;
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if (read_32bitLE(0x00,streamFile) != 0xE5B7ECFE && /* header id */
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read_32bitBE(0x00,streamFile) != 0xE5B7ECFE)
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goto fail;
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if (read_32bitBE(0x04,streamFile) != 0x00) /* version? */
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goto fail;
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/* assumed */
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big_endian = read_32bitBE(0x00,streamFile) == 0xE5B7ECFE;
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if (big_endian) {
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read_32bit = read_32bitBE;
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read_f32 = read_f32be;
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} else {
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read_32bit = read_32bitLE;
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read_f32 = read_f32le;
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}
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channel_count = read_8bit(0x05,streamFile);
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if (read_32bit(0x08,streamFile) != get_streamfile_size(streamFile))
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goto fail;
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if (read_8bit(0x0c,streamFile) != 0x00) /* ? */
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goto fail;
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sample_rate = (int)read_f32(0x0c, streamFile); /* sample rate in 32b float (WHY?) */
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num_samples = read_32bit(0x10, streamFile);
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loop_start = read_32bit(0x14, streamFile);
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loop_end = read_32bit(0x18, streamFile);
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codec = read_8bit(0x1c, streamFile);
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channel_count = read_8bit(0x1d, streamFile);
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if (read_8bit(0x1e, streamFile) != 0x00) goto fail; /* unknown */
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if (read_8bit(0x1f, streamFile) != 0x00) goto fail; /* unknown */
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start_offset = read_32bit(0x20, streamFile);
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interleave = read_32bit(0x24, streamFile); /* typically half data_size */
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extradata_offset = read_32bit(0x28, streamFile); /* OR: extradata size (0x2c) */
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loop_flag = (loop_start > 0);
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/* some songs (ex. Adventure Time's m_candykingdom_overworld.wave) do full loops, but there is no way
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* to tell them apart from sfx/voices, so we try to detect if it's long enough. */
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if(!loop_flag
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&& loop_start == 0 && loop_end == num_samples /* full loop */
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&& channel_count > 1
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&& num_samples > 20*sample_rate) { /* in seconds */
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loop_flag = 1;
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}
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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_samples = num_samples;
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vgmstream->loop_start_sample = loop_start;
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vgmstream->loop_end_sample = loop_end;
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vgmstream->meta_type = meta_WAVE;
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/* not sure if there are other codecs but anyway */
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switch(codec) {
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case 0x02:
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vgmstream->coding_type = coding_NGC_DSP;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = interleave;
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/* ADPCM setup: 0x20 coefs + 0x06 initial ps/hist1/hist2 + 0x06 loop ps/hist1/hist2, per channel */
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dsp_read_coefs(vgmstream, streamFile, extradata_offset+0x00, 0x2c, big_endian);
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dsp_read_hist(vgmstream, streamFile, extradata_offset+0x22, 0x2c, big_endian);
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break;
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default:
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goto fail;
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}
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if (!vgmstream_open_stream(vgmstream,streamFile,start_offset))
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goto fail;
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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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