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in stream encoder, only allocate and calculate real signal if max lpc order > 0

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This commit is contained in:
Josh Coalson
2004-12-30 03:47:49 +00:00
parent 2de1124e36
commit c549f0f17e
2 changed files with 214 additions and 86 deletions
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4
doc/html/changelog.html
View File

@@ -92,6 +92,7 @@
<LI>
General:
<UL>
<LI>Sped up encoding when not using LPC (i.e. when using <TT>flac</TT> options <TT>-0</TT>, <TT>-1</TT>, <TT>-2</TT>, or <TT>-l 0</TT>).</LI>
</UL>
</LI>
<LI>
@@ -129,7 +130,8 @@
<LI>
libraries:
<UL>
<LI>libFLAC, libOggFLAC: Can now be compiled to use only integer instructions, including encoding. The decoder is almost completely integer anyway but there were a couple places that needed a fixed-point replacement. There is no fixed-point version of LPC analysis yet, so if libFLAC is compiled integer-only, it will behave as if the max LPC order is 0 (i.e. used fixed predictors only).</LI>
<LI>libFLAC: Sped up encoding when not using LPC (i.e. <TT>max_lpc_order == 0</TT>).</LI>
<LI>libFLAC, libOggFLAC: Can now be compiled to use only integer instructions, including encoding. The decoder is almost completely integer anyway but there were a couple places that needed a fixed-point replacement. There is no fixed-point version of LPC analysis yet, so if libFLAC is compiled integer-only, the encoder will behave as if the max LPC order is 0 (i.e. used fixed predictors only). LPC decoding is supported in all cases as it always was integer-only.</LI>
</UL>
</LI>
<LI>

126
src/libFLAC/stream_encoder.c
View File

@@ -1374,7 +1374,16 @@ FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, c
FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
j = 0;
/*
* we have several flavors of the same basic loop, optimized for
* different conditions:
*/
if(encoder->protected_->max_lpc_order > 0) {
if(encoder->protected_->do_mid_side_stereo && channels == 2) {
/*
* stereo coding: unroll channel loop
* with LPC: calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
@@ -1408,6 +1417,10 @@ FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, c
} while(j < samples);
}
else {
/*
* independent channel coding: buffer each channel in inner loop
* with LPC: calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
@@ -1428,6 +1441,55 @@ FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, c
}
} while(j < samples);
}
}
else {
if(encoder->protected_->do_mid_side_stereo && channels == 2) {
/*
* stereo coding: unroll channel loop
* without LPC: no need to calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
encoder->private_->integer_signal[0][i] = mid = side = buffer[0][j];
x = buffer[1][j];
encoder->private_->integer_signal[1][i] = x;
mid += x;
side -= x;
mid >>= 1; /* NOTE: not the same as 'mid = (buffer[0][j] + buffer[1][j]) / 2' ! */
encoder->private_->integer_signal_mid_side[1][i] = side;
encoder->private_->integer_signal_mid_side[0][i] = mid;
encoder->private_->current_sample_number++;
}
if(i == blocksize) {
if(!process_frame_(encoder, false)) /* false => not last frame */
return false;
}
} while(j < samples);
}
else {
/*
* independent channel coding: buffer each channel in inner loop
* without LPC: no need to calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
for(channel = 0; channel < channels; channel++)
encoder->private_->integer_signal[channel][i] = buffer[channel][j];
encoder->private_->current_sample_number++;
}
if(i == blocksize) {
if(!process_frame_(encoder, false)) /* false => not last frame */
return false;
}
} while(j < samples);
}
}
return true;
}
@@ -1442,7 +1504,16 @@ FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder
FLAC__ASSERT(encoder->protected_->state == FLAC__STREAM_ENCODER_OK);
j = k = 0;
/*
* we have several flavors of the same basic loop, optimized for
* different conditions:
*/
if(encoder->protected_->max_lpc_order > 0) {
if(encoder->protected_->do_mid_side_stereo && channels == 2) {
/*
* stereo coding: unroll channel loop
* with LPC: calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
@@ -1476,6 +1547,10 @@ FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder
} while(j < samples);
}
else {
/*
* independent channel coding: buffer each channel in inner loop
* with LPC: calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
@@ -1496,6 +1571,55 @@ FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder
}
} while(j < samples);
}
}
else {
if(encoder->protected_->do_mid_side_stereo && channels == 2) {
/*
* stereo coding: unroll channel loop
* without LPC: no need to calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
encoder->private_->integer_signal[0][i] = mid = side = buffer[k++];
x = buffer[k++];
encoder->private_->integer_signal[1][i] = x;
mid += x;
side -= x;
mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */
encoder->private_->integer_signal_mid_side[1][i] = side;
encoder->private_->integer_signal_mid_side[0][i] = mid;
encoder->private_->current_sample_number++;
}
if(i == blocksize) {
if(!process_frame_(encoder, false)) /* false => not last frame */
return false;
}
} while(j < samples);
}
else {
/*
* independent channel coding: buffer each channel in inner loop
* without LPC: no need to calculate floating point version of signal
*/
do {
if(encoder->protected_->verify)
append_to_verify_fifo_interleaved_(&encoder->private_->verify.input_fifo, buffer, j, channels, min(blocksize-encoder->private_->current_sample_number, samples-j));
for(i = encoder->private_->current_sample_number; i < blocksize && j < samples; i++, j++) {
for(channel = 0; channel < channels; channel++)
encoder->private_->integer_signal[channel][i] = buffer[k++];
encoder->private_->current_sample_number++;
}
if(i == blocksize) {
if(!process_frame_(encoder, false)) /* false => not last frame */
return false;
}
} while(j < samples);
}
}
return true;
}
@@ -1630,6 +1754,7 @@ FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size)
for(i = 0; ok && i < encoder->protected_->channels; i++) {
ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_unaligned[i], &encoder->private_->integer_signal[i]);
#ifndef FLAC__INTEGER_ONLY_LIBRARY
if(encoder->protected_->max_lpc_order > 0)
ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_unaligned[i], &encoder->private_->real_signal[i]);
#endif
memset(encoder->private_->integer_signal[i], 0, sizeof(FLAC__int32)*4);
@@ -1638,6 +1763,7 @@ FLAC__bool resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size)
for(i = 0; ok && i < 2; i++) {
ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size+4, &encoder->private_->integer_signal_mid_side_unaligned[i], &encoder->private_->integer_signal_mid_side[i]);
#ifndef FLAC__INTEGER_ONLY_LIBRARY
if(encoder->protected_->max_lpc_order > 0)
ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private_->real_signal_mid_side_unaligned[i], &encoder->private_->real_signal_mid_side[i]);
#endif
memset(encoder->private_->integer_signal_mid_side[i], 0, sizeof(FLAC__int32)*4);