113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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#include "../util/chunks.h"
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typedef struct {
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uint32_t data_offset;
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uint32_t data_size;
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uint32_t dpds_offset;
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uint32_t dpds_size;
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int loop_flag;
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int format;
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int channels;
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int sample_rate;
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int bytes;
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int avg_bitrate;
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int block_size;
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} xwma_header_t;
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/* XWMA - Microsoft WMA container [The Elder Scrolls: Skyrim (PC/X360), Hydrophobia (PC)] */
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VGMSTREAM* init_vgmstream_xwma(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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xwma_header_t xwma = {0};
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/* checks */
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if (!is_id32be(0x00,sf, "RIFF"))
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goto fail;
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if (!is_id32be(0x08,sf, "XWMA"))
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goto fail;
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/* .xwma: standard
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* .xwm: The Elder Scrolls: Skyrim (PC), Blade Arcus from Shining (PC)
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* .xma: Castle Crashers (PC)
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* .wma/lwma: BattleBlock Theater (PC)
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*/
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if (!check_extensions(sf, "xwma,xwm,xma,wma,lwma"))
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goto fail;
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{
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enum {
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CHUNK_fmt = 0x666d7420, /* "fmt " */
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CHUNK_data = 0x64617461, /* "data" */
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CHUNK_dpds = 0x64706473, /* "dpds" */
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};
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chunk_t rc = {0};
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rc.current = 0x0c;
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while (next_chunk(&rc, sf)) {
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switch(rc.type) {
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case CHUNK_fmt:
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xwma.format = read_u16le(rc.offset+0x00, sf);
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xwma.channels = read_u16le(rc.offset+0x02, sf);
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xwma.sample_rate = read_u32le(rc.offset+0x04, sf);
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xwma.avg_bitrate = read_u32le(rc.offset+0x08, sf);
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xwma.block_size = read_u16le(rc.offset+0x0c, sf);
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break;
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case CHUNK_data:
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xwma.data_offset = rc.offset;
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xwma.data_size = rc.size;
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break;
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case CHUNK_dpds:
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xwma.dpds_offset = rc.offset;
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xwma.dpds_size = rc.size;
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break;
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default:
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break;
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}
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}
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if (!xwma.format || !xwma.data_offset)
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goto fail;
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}
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(xwma.channels, xwma.loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->meta_type = meta_XWMA;
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vgmstream->sample_rate = xwma.sample_rate;
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/* the main purpose of this meta is redoing the XWMA header to:
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* - fix XWMA with buggy bit rates so FFmpeg can play them ok
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* - remove seek table to fix FFmpeg buggy XWMA seeking (see init_seek)
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* - read num_samples correctly
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*/
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#ifdef VGM_USE_FFMPEG
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{
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vgmstream->codec_data = init_ffmpeg_xwma(sf, xwma.data_offset, xwma.data_size, xwma.format, xwma.channels, xwma.sample_rate, xwma.avg_bitrate, xwma.block_size);
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if (!vgmstream->codec_data) goto fail;
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vgmstream->coding_type = coding_FFmpeg;
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vgmstream->layout_type = layout_none;
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/* try from (optional) seek table, or (less accurate) manual count */
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vgmstream->num_samples = xwma_dpds_get_samples(sf, xwma.dpds_offset, xwma.dpds_size, xwma.channels, 0);
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if (!vgmstream->num_samples)
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vgmstream->num_samples = xwma_get_samples(sf, xwma.data_offset, xwma.data_size, xwma.format, xwma.channels, xwma.sample_rate, xwma.block_size);
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}
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#else
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goto fail;
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#endif
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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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