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Clean EA-XA and fix some subsongs (don't use channel_start_offset)

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Also fix 'sample' type shadowing and Maxis-XA skipping a frame in mono
This commit is contained in:
bnnm 2017-12-03 01:37:56 +01:00
parent b9c3bd9a01
commit 94de52ec2d
3 changed files with 83 additions and 101 deletions
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163
src/coding/ea_xa_decoder.c
View File

@ -29,59 +29,57 @@ static const int EA_XA_TABLE[20] = {
0, -1, -3, -4
};
/* EA XA v2; like ea_xa_int but with "PCM samples" flag and doesn't add 128 on expand or clamp (pre-adjusted by the encoder?) */
/* EA XA v2 (always mono); like ea_xa_int but with "PCM samples" flag and doesn't add 128 on expand or clamp (pre-adjusted by the encoder?) */
void decode_ea_xa_v2(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do,int channel) {
uint8_t frame_info;
int32_t sample_count;
int32_t coef1, coef2;
int i, shift;
off_t channel_offset = stream->channel_start_offset; /* suboffset within frame */
int i, sample_count, shift;
first_sample = first_sample%28;
int pcm_frame_size = 0x01 + 2*0x02 + 28*0x02;
int xa_frame_size = 0x0f;
int frame_samples = 28;
first_sample = first_sample % frame_samples;
/* header */
frame_info = (uint8_t)read_8bit(stream->offset+channel_offset,stream->streamfile);
channel_offset++;
frame_info = read_8bit(stream->offset,stream->streamfile);
if (frame_info == 0xEE) { /* PCM frame (used in later revisions), samples always BE */
stream->adpcm_history1_32 = read_16bitBE(stream->offset+channel_offset+0x00,stream->streamfile);
stream->adpcm_history2_32 = read_16bitBE(stream->offset+channel_offset+0x02,stream->streamfile);
channel_offset += 4;
stream->adpcm_history1_32 = read_16bitBE(stream->offset + 0x01 + 0x00,stream->streamfile);
stream->adpcm_history2_32 = read_16bitBE(stream->offset + 0x01 + 0x02,stream->streamfile);
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
outbuf[sample_count] = read_16bitBE(stream->offset+channel_offset,stream->streamfile);
channel_offset+=2;
outbuf[sample_count] = read_16bitBE(stream->offset + 0x01 + 2*0x02 + i*0x02,stream->streamfile);
}
/* Only increment offset on complete frame */
if (channel_offset-stream->channel_start_offset == (2*28)+5)
stream->channel_start_offset += (2*28)+5;
} else { /* ADPCM frame */
/* only increment offset on complete frame */
if (i == frame_samples)
stream->offset += pcm_frame_size;
}
else { /* ADPCM frame */
coef1 = EA_XA_TABLE[(frame_info >> 4) + 0];
coef2 = EA_XA_TABLE[(frame_info >> 4) + 4];
shift = (frame_info & 0x0F) + 8;
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
uint8_t sample_byte, sample_nibble;
int32_t sample;
off_t byte_offset = (stream->offset + channel_offset + i/2);
int32_t new_sample;
off_t byte_offset = (stream->offset + 0x01 + i/2);
int nibble_shift = (!(i&1)) ? 4 : 0; /* high nibble first */
sample_byte = (uint8_t)read_8bit(byte_offset,stream->streamfile);
sample_nibble = (!(i%2) ? sample_byte >> 4 : sample_byte & 0x0F); /* i=even > high nibble */
sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
sample = (sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32) >> 8;
sample = clamp16(sample);
sample_nibble = (sample_byte >> nibble_shift) & 0x0F;
new_sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
new_sample = (new_sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32) >> 8;
new_sample = clamp16(new_sample);
outbuf[sample_count] = sample;
outbuf[sample_count] = new_sample;
stream->adpcm_history2_32 = stream->adpcm_history1_32;
stream->adpcm_history1_32 = sample;
stream->adpcm_history1_32 = new_sample;
}
channel_offset += i/2;
/* Only increment offset on complete frame */
if (channel_offset - stream->channel_start_offset == 0x0F)
stream->channel_start_offset += 0x0F;
/* only increment offset on complete frame */
if (i == frame_samples)
stream->offset += xa_frame_size;
}
}
@ -90,43 +88,42 @@ void decode_ea_xa(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing
uint8_t frame_info;
int32_t coef1, coef2;
int i, sample_count, shift;
off_t channel_offset = stream->channel_start_offset; /* suboffset within frame */
int hn = (channel==0); /* high nibble marker for stereo subinterleave, ch0/L=high nibble, ch1/R=low nibble */
first_sample = first_sample % 28;
int frame_size = 0x1e;
int frame_samples = 28;
first_sample = first_sample % frame_samples;
/* header (coefs ch0+ch1 + shift ch0+ch1) */
frame_info = read_8bit(stream->offset+channel_offset,stream->streamfile);
channel_offset++;
frame_info = read_8bit(stream->offset+0x00,stream->streamfile);
coef1 = EA_XA_TABLE[(hn ? frame_info >> 4 : frame_info & 0x0F) + 0];
coef2 = EA_XA_TABLE[(hn ? frame_info >> 4 : frame_info & 0x0F) + 4];
shift = (frame_info & 0x0F) + 8;
frame_info = read_8bit(stream->offset+channel_offset,stream->streamfile);
channel_offset++;
frame_info = read_8bit(stream->offset+0x01,stream->streamfile);
shift = (hn ? frame_info >> 4 : frame_info & 0x0F) + 8;
/* samples */
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
uint8_t sample_byte, sample_nibble;
int32_t sample;
off_t byte_offset = (stream->offset + channel_offset + i);
int32_t new_sample;
off_t byte_offset = (stream->offset + 0x02 + i);
int nibble_shift = (hn ? 4 : 0); /* high nibble first */
sample_byte = (uint8_t)read_8bit(byte_offset,stream->streamfile);
sample_nibble = (hn ? sample_byte >> 4 : sample_byte & 0x0F);
sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
sample = (sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32 + 128) >> 8;
sample = clamp16(sample);
sample_nibble = (sample_byte >> nibble_shift) & 0x0F;
new_sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
new_sample = (new_sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32 + 128) >> 8;
new_sample = clamp16(new_sample);
outbuf[sample_count] = sample;
outbuf[sample_count] = new_sample;
stream->adpcm_history2_32 = stream->adpcm_history1_32;
stream->adpcm_history1_32 = sample;
stream->adpcm_history1_32 = new_sample;
}
channel_offset += i;
/* Only increment offset on complete frame */
if(channel_offset - stream->channel_start_offset == 0x1E)
stream->channel_start_offset += 0x1E;
/* only increment offset on complete frame */
if (i == frame_samples)
stream->offset += frame_size;
}
/* EA-XA v1 mono/interleave */
@ -134,13 +131,13 @@ void decode_ea_xa_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspa
uint8_t frame_info;
int32_t coef1, coef2;
int i, sample_count, shift;
off_t channel_offset = stream->channel_start_offset; /* suboffset within frame */
first_sample = first_sample % 28;
int frame_size = 0x0f;
int frame_samples = 28;
first_sample = first_sample % frame_samples;
/* header (coefs+shift ch0) */
frame_info = read_8bit(stream->offset+channel_offset,stream->streamfile);
channel_offset++;
frame_info = read_8bit(stream->offset,stream->streamfile);
coef1 = EA_XA_TABLE[(frame_info >> 4) + 0];
coef2 = EA_XA_TABLE[(frame_info >> 4) + 4];
shift = (frame_info & 0x0F) + 8;
@ -148,39 +145,38 @@ void decode_ea_xa_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspa
/* samples */
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
uint8_t sample_byte, sample_nibble;
int32_t sample;
off_t byte_offset = (stream->offset + channel_offset + i/2);
int32_t new_sample;
off_t byte_offset = (stream->offset + 0x01 + i/2);
int nibble_shift = (!(i&1)) ? 4 : 0; /* high nibble first */
sample_byte = (uint8_t)read_8bit(byte_offset,stream->streamfile);
sample_nibble = (!(i%2) ? sample_byte >> 4 : sample_byte & 0x0F); /* i=even > high nibble */
sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
sample = (sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32 + 128) >> 8;
sample = clamp16(sample);
sample_nibble = (sample_byte >> nibble_shift) & 0x0F;
new_sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
new_sample = (new_sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32 + 128) >> 8;
new_sample = clamp16(new_sample);
outbuf[sample_count] = sample;
outbuf[sample_count] = new_sample;
stream->adpcm_history2_32 = stream->adpcm_history1_32;
stream->adpcm_history1_32 = sample;
stream->adpcm_history1_32 = new_sample;
}
channel_offset += i/2;
/* Only increment offset on complete frame */
if(channel_offset - stream->channel_start_offset == 0x0F)
stream->channel_start_offset += 0x0F;
/* only increment offset on complete frame */
if (i == frame_samples)
stream->offset += frame_size;
}
/* Maxis EA-XA v1 (mono+stereo), differing slightly in the header layout in stereo mode */
/* Maxis EA-XA v1 (mono+stereo) with byte-interleave layout in stereo mode */
void decode_maxis_xa(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do, int channel) {
uint8_t frame_info;
int32_t coef1, coef2;
int i, sample_count, shift;
off_t channel_offset = stream->channel_start_offset;
int frame_size = channelspacing * 15; /* mono samples have a frame of 15, stereo files have frames of 30 */
first_sample = first_sample % 28;
int frame_size = 0x0f * channelspacing; /* varies in mono/stereo */
int frame_samples = 28;
first_sample = first_sample % frame_samples;
/* header (coefs+shift ch0 + coefs+shift ch1) */
frame_info = read_8bit(channel_offset,stream->streamfile);
channel_offset += channelspacing;
frame_info = read_8bit(stream->offset + channel,stream->streamfile);
coef1 = EA_XA_TABLE[(frame_info >> 4) + 0];
coef2 = EA_XA_TABLE[(frame_info >> 4) + 4];
shift = (frame_info & 0x0F) + 8;
@ -188,27 +184,22 @@ void decode_maxis_xa(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspac
/* samples */
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
uint8_t sample_byte, sample_nibble;
int32_t sample;
off_t byte_offset = (stream->offset + channel_offset);
int32_t new_sample;
off_t byte_offset = (stream->offset + 0x01*channelspacing + (channelspacing == 2 ? i/2 + channel + (i/2)*0x01 : i/2));
int nibble_shift = (!(i&1)) ? 4 : 0; /* high nibble first */
sample_byte = (uint8_t)read_8bit(byte_offset,stream->streamfile);
sample_nibble = (i&1) ? sample_byte & 0x0F : sample_byte >> 4;
sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
sample = (sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32 + 128) >> 8;
sample = clamp16(sample);
sample_nibble = (sample_byte >> nibble_shift) & 0x0F;
new_sample = (sample_nibble << 28) >> shift; /* sign extend to 32b and shift */
new_sample = (new_sample + coef1 * stream->adpcm_history1_32 + coef2 * stream->adpcm_history2_32 + 128) >> 8;
new_sample = clamp16(new_sample);
outbuf[sample_count] = sample;
outbuf[sample_count] = new_sample;
stream->adpcm_history2_32 = stream->adpcm_history1_32;
stream->adpcm_history1_32 = sample;
if(i&1)
stream->offset+=channelspacing;
stream->adpcm_history1_32 = new_sample;
}
channel_offset+=i;
/* Only increment offset on complete frame */
if (channel_offset - stream->channel_start_offset == frame_size) {
stream->channel_start_offset += frame_size;
stream->offset=0;
}
/* only increment offset on complete frame */
if (i == frame_samples)
stream->offset += frame_size;
}

16
src/meta/maxis_xa.c
View File

@ -5,7 +5,7 @@
VGMSTREAM * init_vgmstream_maxis_xa(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
off_t start_offset;
int loop_flag, channel_count, i;
int loop_flag, channel_count;
/* check extension, case insensitive */
if (!check_extensions(streamFile,"xa"))
@ -18,30 +18,22 @@ VGMSTREAM * init_vgmstream_maxis_xa(STREAMFILE *streamFile) {
loop_flag = 0;
channel_count = read_16bitLE(0x0A,streamFile);
start_offset = 0x18;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
start_offset = 0x18;
vgmstream->channels = channel_count;
vgmstream->sample_rate = read_32bitLE(0x0C,streamFile);
vgmstream->coding_type = coding_MAXIS_XA;
vgmstream->num_samples = read_32bitLE(0x04,streamFile)/2/channel_count;
vgmstream->layout_type = layout_none;
vgmstream->meta_type = meta_MAXIS_XA;
vgmstream->coding_type = coding_MAXIS_XA;
vgmstream->layout_type = layout_none;
/* open streams */
if (!vgmstream_open_stream(vgmstream,streamFile,start_offset))
goto fail;
/* fix channel offsets as needed by the codec (could be simplified) */
for (i = 0; i < channel_count; i++) {
vgmstream->ch[i].channel_start_offset = start_offset+i;
vgmstream->ch[i].offset = 0;
}
return vgmstream;
fail:

5
src/vgmstream.c
View File

@ -1062,9 +1062,8 @@ int get_vgmstream_samples_per_frame(VGMSTREAM * vgmstream) {
case coding_EA_XA:
case coding_EA_XA_int:
case coding_EA_XA_V2:
return 28;
case coding_MAXIS_XA:
return 14*vgmstream->channels;
case coding_MAXIS_XA:
return 28;
case coding_EA_XAS:
return 128;
case coding_WS: