111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
#include "coding.h"
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#include "circus_decoder_lib.h"
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struct circus_codec_data {
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STREAMFILE* sf;
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int16_t* buf;
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int buf_samples_all;
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circus_handle_t* handle;
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};
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circus_codec_data* init_circus_vq(STREAMFILE* sf, off_t start, uint8_t codec, uint8_t flags) {
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circus_codec_data* data = NULL;
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data = calloc(1, sizeof(circus_codec_data));
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if (!data) goto fail;
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data->sf = reopen_streamfile(sf, 0);
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data->handle = circus_init(start, codec, flags);
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if (!data->handle) goto fail;
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return data;
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fail:
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free_circus_vq(data);
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return NULL;
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}
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void decode_circus_vq(circus_codec_data* data, sample_t* outbuf, int32_t samples_to_do, int channels) {
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int ok, i, samples_to_get;
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while (samples_to_do > 0) {
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if (data->buf_samples_all == 0) {
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ok = circus_decode_frame(data->handle, data->sf, &data->buf, &data->buf_samples_all);
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if (!ok) goto decode_fail;
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}
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samples_to_get = data->buf_samples_all / channels;
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if (samples_to_get > samples_to_do)
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samples_to_get = samples_to_do;
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for (i = 0; i < samples_to_get * channels; i++) {
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outbuf[i] = data->buf[i];
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}
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data->buf += samples_to_get * channels;
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data->buf_samples_all -= samples_to_get * channels;
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outbuf += samples_to_get * channels;
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samples_to_do -= samples_to_get;
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}
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return;
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decode_fail:
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VGM_LOG("CIRCUS: decode error\n");
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memset(outbuf, 0, samples_to_do * channels * sizeof(sample_t));
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}
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void reset_circus_vq(circus_codec_data* data) {
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if (!data) return;
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circus_reset(data->handle);
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data->buf_samples_all = 0;
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}
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void seek_circus_vq(circus_codec_data* data, int32_t num_sample) {
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if (!data) return;
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reset_circus_vq(data);
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//data->samples_discard = num_sample; //todo (xpcm don't have loop points tho)
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}
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void free_circus_vq(circus_codec_data* data) {
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if (!data) return;
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close_streamfile(data->sf);
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circus_free(data->handle);
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free(data);
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}
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/* ************************************************************************* */
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/* Circus XPCM mode 2 decoding, verified vs EF.exe (info from foo_adpcm/libpcm and https://github.com/lioncash/ExtractData) */
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void decode_circus_adpcm(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int i, sample_pos = 0;
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int32_t hist = stream->adpcm_history1_32;
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int scale = stream->adpcm_scale;
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off_t frame_offset = stream->offset; /* frame size is 1 */
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for (i = first_sample; i < first_sample + samples_to_do; i++) {
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int8_t code = read_u8(frame_offset+i,stream->streamfile);
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hist += code << scale;
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if (code == 0) {
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if (scale > 0)
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scale--;
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}
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else if (code == 127 || code == -128) {
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if (scale < 8)
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scale++;
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}
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outbuf[sample_pos] = hist;
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sample_pos += channelspacing;
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}
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stream->adpcm_history1_32 = hist;
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stream->adpcm_scale = scale;
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}
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