83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
#include "coding.h"
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#include "../util.h"
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#ifdef VGM_USE_MAIATRAC3PLUS
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#include "maiatrac3plus.h"
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#include "at3plus_decoder.h"
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maiatrac3plus_codec_data *init_at3plus() {
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maiatrac3plus_codec_data *data = malloc(sizeof(maiatrac3plus_codec_data));
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data->buffer = 0;
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data->samples_discard = 0;
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data->handle = Atrac3plusDecoder_openContext();
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if (!data->handle) goto fail;
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return data;
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fail:
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return NULL;
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}
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void decode_at3plus(VGMSTREAM * vgmstream, sample * outbuf, int channelspacing, int32_t samples_to_do, int channel) {
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VGMSTREAMCHANNEL *ch = &vgmstream->ch[0];
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maiatrac3plus_codec_data *data = vgmstream->codec_data;
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int i;
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int first_sample = vgmstream->samples_into_block % 2048;
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if (0 == channel && (0 == first_sample || data->samples_discard == first_sample))
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{
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uint8_t code_buffer[0x8000];
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int blocks_to_decode = 1;
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int max_blocks_to_decode = (ch->offset - ch->channel_start_offset) / vgmstream->interleave_block_size + 1;
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if (data->samples_discard) blocks_to_decode = 8;
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if (blocks_to_decode > max_blocks_to_decode) blocks_to_decode = max_blocks_to_decode;
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while (blocks_to_decode--) {
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ch->streamfile->read(ch->streamfile, code_buffer, ch->offset - blocks_to_decode * vgmstream->interleave_block_size, vgmstream->interleave_block_size);
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Atrac3plusDecoder_decodeFrame(data->handle, code_buffer, vgmstream->interleave_block_size, &data->channels, (void**)&data->buffer);
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}
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data->samples_discard = 0;
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}
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for (i = 0; i < samples_to_do; i++) {
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outbuf[i*channelspacing] = data->buffer[(first_sample+i)*data->channels+channel];
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}
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if (0 == channel && 2048 == first_sample + samples_to_do) {
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ch->offset += vgmstream->interleave_block_size;
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}
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}
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void reset_at3plus(VGMSTREAM *vgmstream) {
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maiatrac3plus_codec_data *data = vgmstream->codec_data;
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if (!data) return;
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if (data->handle)
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Atrac3plusDecoder_closeContext(data->handle);
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data->handle = Atrac3plusDecoder_openContext();
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data->samples_discard = 0;
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}
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void seek_at3plus(VGMSTREAM *vgmstream, int32_t num_sample) {
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int blocks_to_skip = num_sample / 2048;
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int samples_to_discard = num_sample % 2048;
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maiatrac3plus_codec_data *data = (maiatrac3plus_codec_data *)(vgmstream->codec_data);
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if (!data) return;
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vgmstream->loop_ch[0].offset =
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vgmstream->loop_ch[0].channel_start_offset +
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vgmstream->interleave_block_size * blocks_to_skip;
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data->samples_discard = samples_to_discard;
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}
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void free_at3plus(maiatrac3plus_codec_data *data) {
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if (data) {
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if (data->handle) Atrac3plusDecoder_closeContext(data->handle);
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free(data);
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}
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}
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#endif
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