79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
#include "meta.h"
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#include "../util.h"
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#include "../coding/coding.h"
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/* OGL - Shin'en custom Vorbis [Jett Rocket (Wii), FAST Racing NEO (WiiU)] */
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VGMSTREAM* init_vgmstream_ogl(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset;
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size_t partial_file_size;
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int loop_flag, channels, sample_rate;
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uint32_t num_samples, loop_start_sample, loop_end_sample;
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/* checks */
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if (read_u32le(0x00, sf) > 0x10000000) /* limit loop samples (should catch fourccs) */
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goto fail;
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if (!is_id32be(0x17, sf, "vorb")) /* Vorbis id packet */
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goto fail;
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if (!check_extensions(sf,"ogl"))
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goto fail;
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/* OGL headers are very basic with no ID but libvorbis should reject garbage data anyway */
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loop_flag = read_s32le(0x00,sf) > 0; /* absolute loop offset */
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loop_start_sample = read_s32le(0x04,sf);
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//loop_start_block = read_s32le(0x08,streamFile);
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num_samples = read_s32le(0x0c,sf);
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partial_file_size = read_s32le(0x10,sf); /* header + data not counting end padding */
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if (partial_file_size > get_streamfile_size(sf))
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goto fail;
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loop_end_sample = num_samples; /* there is no data after num_samples (ie.- it's really num_samples) */
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/* actually peeking into the Vorbis id packet */
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channels = read_u8 (0x21,sf);
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sample_rate = read_s32le(0x22,sf);
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, 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_sample;
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vgmstream->loop_end_sample = loop_end_sample;
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vgmstream->meta_type = meta_OGL;
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#ifdef VGM_USE_VORBIS
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{
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vorbis_custom_config cfg = {0};
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vgmstream->layout_type = layout_none;
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vgmstream->coding_type = coding_VORBIS_custom;
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vgmstream->codec_data = init_vorbis_custom(sf, 0x14, VORBIS_OGL, &cfg);
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if (!vgmstream->codec_data) goto fail;
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start_offset = cfg.data_start_offset;
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}
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#else
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goto fail;
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#endif
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/* non-looping files do this */
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if (!num_samples) {
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uint32_t avg_bitrate = read_u32le(0x2a,sf); /* inside id packet */
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/* approximate as we don't know the sizes of all packet headers */ //todo this is wrong... but somehow works?
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vgmstream->num_samples = (partial_file_size - start_offset) * ((sample_rate*10/avg_bitrate)+1);
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}
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/* open the file for reading */
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if (!vgmstream_open_stream(vgmstream, sf, 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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