1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001 Josh Coalson
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
22 #include <stdlib.h> /* for malloc() */
23 #include <string.h> /* for memcpy() */
24 #include "FLAC/encoder.h"
25 #include "private/bitbuffer.h"
26 #include "private/encoder_framing.h"
27 #include "private/fixed.h"
28 #include "private/lpc.h"
29 #include "private/md5.h"
34 #define min(x,y) ((x)<(y)?(x):(y))
39 #define max(x,y) ((x)>(y)?(x):(y))
41 typedef struct FLAC__EncoderPrivate {
42 unsigned input_capacity; /* current size (in samples) of the signal and residual buffers */
43 int32 *integer_signal[FLAC__MAX_CHANNELS]; /* the integer version of the input signal */
44 int32 *integer_signal_mid_side[2]; /* the integer version of the mid-side input signal (stereo only) */
45 real *real_signal[FLAC__MAX_CHANNELS]; /* the floating-point version of the input signal */
46 real *real_signal_mid_side[2]; /* the floating-point version of the mid-side input signal (stereo only) */
47 int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
48 int32 *residual_workspace_mid_side[2][2];
49 FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
50 FLAC__Subframe subframe_workspace_mid_side[2][2];
51 FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
52 FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
53 unsigned best_subframe[FLAC__MAX_CHANNELS]; /* index into the above workspaces */
54 unsigned best_subframe_mid_side[2];
55 unsigned best_subframe_bits[FLAC__MAX_CHANNELS]; /* size in bits of the best subframe for each channel */
56 unsigned best_subframe_bits_mid_side[2];
57 uint32 *abs_residual; /* workspace where the abs(candidate residual) is stored */
58 FLAC__BitBuffer frame; /* the current frame being worked on */
59 bool current_frame_can_do_mid_side; /* encoder sets this false when any given sample of a frame's side channel exceeds 16 bits */
60 double loose_mid_side_stereo_frames_exact; /* exact number of frames the encoder will use before trying both independent and mid/side frames again */
61 unsigned loose_mid_side_stereo_frames; /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */
62 unsigned loose_mid_side_stereo_frame_count; /* number of frames using the current channel assignment */
63 FLAC__ChannelAssignment last_channel_assignment;
64 FLAC__StreamMetaData metadata;
65 unsigned current_sample_number;
66 unsigned current_frame_number;
67 struct MD5Context md5context;
68 FLAC__EncoderWriteStatus (*write_callback)(const FLAC__Encoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
69 void (*metadata_callback)(const FLAC__Encoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data);
71 } FLAC__EncoderPrivate;
73 static bool encoder_resize_buffers_(FLAC__Encoder *encoder, unsigned new_size);
74 static bool encoder_process_frame_(FLAC__Encoder *encoder, bool is_last_frame);
75 static bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame);
76 static bool encoder_process_subframe_(FLAC__Encoder *encoder, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits);
77 static bool encoder_add_subframe_(FLAC__Encoder *encoder, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame);
78 static unsigned encoder_evaluate_constant_subframe_(const int32 signal, unsigned bits_per_sample, FLAC__Subframe *subframe);
79 static unsigned encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe);
80 static unsigned encoder_evaluate_lpc_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], const real lp_coeff[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe);
81 static unsigned encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe);
82 static unsigned encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned max_partition_order, unsigned *best_partition_order, unsigned best_parameters[]);
83 static bool encoder_set_partitioned_rice_(const uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned rice_parameter, const unsigned partition_order, unsigned parameters[], unsigned *bits);
85 const char *FLAC__EncoderWriteStatusString[] = {
86 "FLAC__ENCODER_WRITE_OK",
87 "FLAC__ENCODER_WRITE_FATAL_ERROR"
90 const char *FLAC__EncoderStateString[] = {
92 "FLAC__ENCODER_UNINITIALIZED",
93 "FLAC__ENCODER_INVALID_NUMBER_OF_CHANNELS",
94 "FLAC__ENCODER_INVALID_BITS_PER_SAMPLE",
95 "FLAC__ENCODER_INVALID_SAMPLE_RATE",
96 "FLAC__ENCODER_INVALID_BLOCK_SIZE",
97 "FLAC__ENCODER_INVALID_QLP_COEFF_PRECISION",
98 "FLAC__ENCODER_MID_SIDE_CHANNELS_MISMATCH",
99 "FLAC__ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH",
100 "FLAC__ENCODER_ILLEGAL_MID_SIDE_FORCE",
101 "FLAC__ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER",
102 "FLAC__ENCODER_NOT_STREAMABLE",
103 "FLAC__ENCODER_FRAMING_ERROR",
104 "FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING",
105 "FLAC__ENCODER_FATAL_ERROR_WHILE_WRITING",
106 "FLAC__ENCODER_MEMORY_ALLOCATION_ERROR"
110 bool encoder_resize_buffers_(FLAC__Encoder *encoder, unsigned new_size)
114 int32 *previous_is, *current_is;
115 real *previous_rs, *current_rs;
117 uint32 *abs_residual;
119 assert(new_size > 0);
120 assert(encoder->state == FLAC__ENCODER_OK);
121 assert(encoder->guts->current_sample_number == 0);
123 /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */
124 if(new_size <= encoder->guts->input_capacity)
129 for(i = 0; ok && i < encoder->channels; i++) {
130 /* integer version of the signal */
131 previous_is = encoder->guts->integer_signal[i];
132 current_is = (int32*)malloc(sizeof(int32) * new_size);
133 if(0 == current_is) {
134 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
138 encoder->guts->integer_signal[i] = current_is;
142 /* real version of the signal */
143 previous_rs = encoder->guts->real_signal[i];
144 current_rs = (real*)malloc(sizeof(real) * new_size);
145 if(0 == current_rs) {
146 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
150 encoder->guts->real_signal[i] = current_rs;
157 for(i = 0; ok && i < 2; i++) {
158 /* integer version of the signal */
159 previous_is = encoder->guts->integer_signal_mid_side[i];
160 current_is = (int32*)malloc(sizeof(int32) * new_size);
161 if(0 == current_is) {
162 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
166 encoder->guts->integer_signal_mid_side[i] = current_is;
170 /* real version of the signal */
171 previous_rs = encoder->guts->real_signal_mid_side[i];
172 current_rs = (real*)malloc(sizeof(real) * new_size);
173 if(0 == current_rs) {
174 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
178 encoder->guts->real_signal_mid_side[i] = current_rs;
185 for(channel = 0; channel < encoder->channels; channel++) {
186 for(i = 0; i < 2; i++) {
187 residual = (int32*)malloc(sizeof(int32) * new_size);
189 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
193 if(encoder->guts->residual_workspace[channel][i] != 0)
194 free(encoder->guts->residual_workspace[channel][i]);
195 encoder->guts->residual_workspace[channel][i] = residual;
199 for(channel = 0; channel < 2; channel++) {
200 for(i = 0; i < 2; i++) {
201 residual = (int32*)malloc(sizeof(int32) * new_size);
203 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
207 if(encoder->guts->residual_workspace_mid_side[channel][i] != 0)
208 free(encoder->guts->residual_workspace_mid_side[channel][i]);
209 encoder->guts->residual_workspace_mid_side[channel][i] = residual;
213 abs_residual = (uint32*)malloc(sizeof(uint32) * new_size);
215 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
219 if(encoder->guts->abs_residual != 0)
220 free(encoder->guts->abs_residual);
221 encoder->guts->abs_residual = abs_residual;
225 encoder->guts->input_capacity = new_size;
230 FLAC__Encoder *FLAC__encoder_get_new_instance()
232 FLAC__Encoder *encoder = (FLAC__Encoder*)malloc(sizeof(FLAC__Encoder));
234 encoder->state = FLAC__ENCODER_UNINITIALIZED;
240 void FLAC__encoder_free_instance(FLAC__Encoder *encoder)
242 assert(encoder != 0);
246 FLAC__EncoderState FLAC__encoder_init(FLAC__Encoder *encoder, FLAC__EncoderWriteStatus (*write_callback)(const FLAC__Encoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data), void (*metadata_callback)(const FLAC__Encoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data), void *client_data)
249 FLAC__StreamMetaData padding;
251 assert(sizeof(int) >= 4); /* we want to die right away if this is not true */
252 assert(encoder != 0);
253 assert(write_callback != 0);
254 assert(metadata_callback != 0);
255 assert(encoder->state == FLAC__ENCODER_UNINITIALIZED);
256 assert(encoder->guts == 0);
258 encoder->state = FLAC__ENCODER_OK;
260 if(encoder->channels == 0 || encoder->channels > FLAC__MAX_CHANNELS)
261 return encoder->state = FLAC__ENCODER_INVALID_NUMBER_OF_CHANNELS;
263 if(encoder->do_mid_side_stereo && encoder->channels != 2)
264 return encoder->state = FLAC__ENCODER_MID_SIDE_CHANNELS_MISMATCH;
267 if(encoder->do_mid_side_stereo && encoder->bits_per_sample > 16)
268 return encoder->state = FLAC__ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH;
271 if(encoder->loose_mid_side_stereo && !encoder->do_mid_side_stereo)
272 return encoder->state = FLAC__ENCODER_ILLEGAL_MID_SIDE_FORCE;
274 if(encoder->bits_per_sample == 0 || encoder->bits_per_sample > FLAC__MAX_BITS_PER_SAMPLE)
275 return encoder->state = FLAC__ENCODER_INVALID_BITS_PER_SAMPLE;
277 if(encoder->sample_rate == 0 || encoder->sample_rate > FLAC__MAX_SAMPLE_RATE)
278 return encoder->state = FLAC__ENCODER_INVALID_SAMPLE_RATE;
280 if(encoder->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->blocksize > FLAC__MAX_BLOCK_SIZE)
281 return encoder->state = FLAC__ENCODER_INVALID_BLOCK_SIZE;
283 if(encoder->blocksize < encoder->max_lpc_order)
284 return encoder->state = FLAC__ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER;
286 if(encoder->qlp_coeff_precision == 0) {
287 if(encoder->bits_per_sample < 16) {
288 /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */
289 /* @@@ until then we'll make a guess */
290 encoder->qlp_coeff_precision = max(5, 2 + encoder->bits_per_sample / 2);
292 else if(encoder->bits_per_sample == 16) {
293 if(encoder->blocksize <= 192)
294 encoder->qlp_coeff_precision = 7;
295 else if(encoder->blocksize <= 384)
296 encoder->qlp_coeff_precision = 8;
297 else if(encoder->blocksize <= 576)
298 encoder->qlp_coeff_precision = 9;
299 else if(encoder->blocksize <= 1152)
300 encoder->qlp_coeff_precision = 10;
301 else if(encoder->blocksize <= 2304)
302 encoder->qlp_coeff_precision = 11;
303 else if(encoder->blocksize <= 4608)
304 encoder->qlp_coeff_precision = 12;
306 encoder->qlp_coeff_precision = 13;
309 encoder->qlp_coeff_precision = min(13, 8*sizeof(int32) - encoder->bits_per_sample - 1);
312 else if(encoder->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->qlp_coeff_precision + encoder->bits_per_sample >= 8*sizeof(uint32) || encoder->qlp_coeff_precision >= (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
313 return encoder->state = FLAC__ENCODER_INVALID_QLP_COEFF_PRECISION;
315 if(encoder->streamable_subset) {
316 if(encoder->bits_per_sample != 8 && encoder->bits_per_sample != 12 && encoder->bits_per_sample != 16 && encoder->bits_per_sample != 20 && encoder->bits_per_sample != 24)
317 return encoder->state = FLAC__ENCODER_NOT_STREAMABLE;
318 if(encoder->sample_rate > 655350)
319 return encoder->state = FLAC__ENCODER_NOT_STREAMABLE;
322 if(encoder->rice_optimization_level >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
323 encoder->rice_optimization_level = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
325 encoder->guts = (FLAC__EncoderPrivate*)malloc(sizeof(FLAC__EncoderPrivate));
326 if(encoder->guts == 0)
327 return encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
329 encoder->guts->input_capacity = 0;
330 for(i = 0; i < encoder->channels; i++) {
331 encoder->guts->integer_signal[i] = 0;
332 encoder->guts->real_signal[i] = 0;
334 for(i = 0; i < 2; i++) {
335 encoder->guts->integer_signal_mid_side[i] = 0;
336 encoder->guts->real_signal_mid_side[i] = 0;
338 for(i = 0; i < encoder->channels; i++) {
339 encoder->guts->residual_workspace[i][0] = encoder->guts->residual_workspace[i][1] = 0;
340 encoder->guts->best_subframe[i] = 0;
342 for(i = 0; i < 2; i++) {
343 encoder->guts->residual_workspace_mid_side[i][0] = encoder->guts->residual_workspace_mid_side[i][1] = 0;
344 encoder->guts->best_subframe_mid_side[i] = 0;
346 for(i = 0; i < encoder->channels; i++) {
347 encoder->guts->subframe_workspace_ptr[i][0] = &encoder->guts->subframe_workspace[i][0];
348 encoder->guts->subframe_workspace_ptr[i][1] = &encoder->guts->subframe_workspace[i][1];
350 for(i = 0; i < 2; i++) {
351 encoder->guts->subframe_workspace_ptr_mid_side[i][0] = &encoder->guts->subframe_workspace_mid_side[i][0];
352 encoder->guts->subframe_workspace_ptr_mid_side[i][1] = &encoder->guts->subframe_workspace_mid_side[i][1];
354 encoder->guts->abs_residual = 0;
355 encoder->guts->current_frame_can_do_mid_side = true;
356 encoder->guts->loose_mid_side_stereo_frames_exact = (double)encoder->sample_rate * 0.4 / (double)encoder->blocksize;
357 encoder->guts->loose_mid_side_stereo_frames = (unsigned)(encoder->guts->loose_mid_side_stereo_frames_exact + 0.5);
358 if(encoder->guts->loose_mid_side_stereo_frames == 0)
359 encoder->guts->loose_mid_side_stereo_frames = 1;
360 encoder->guts->loose_mid_side_stereo_frame_count = 0;
361 encoder->guts->current_sample_number = 0;
362 encoder->guts->current_frame_number = 0;
364 if(!encoder_resize_buffers_(encoder, encoder->blocksize)) {
365 /* the above function sets the state for us in case of an error */
366 return encoder->state;
368 FLAC__bitbuffer_init(&encoder->guts->frame);
369 encoder->guts->write_callback = write_callback;
370 encoder->guts->metadata_callback = metadata_callback;
371 encoder->guts->client_data = client_data;
374 * write the stream header
376 if(!FLAC__bitbuffer_clear(&encoder->guts->frame))
377 return encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
379 if(!FLAC__bitbuffer_write_raw_uint32(&encoder->guts->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN))
380 return encoder->state = FLAC__ENCODER_FRAMING_ERROR;
382 encoder->guts->metadata.type = FLAC__METADATA_TYPE_STREAMINFO;
383 encoder->guts->metadata.is_last = (encoder->padding == 0);
384 encoder->guts->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
385 encoder->guts->metadata.data.stream_info.min_blocksize = encoder->blocksize; /* this encoder uses the same blocksize for the whole stream */
386 encoder->guts->metadata.data.stream_info.max_blocksize = encoder->blocksize;
387 encoder->guts->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
388 encoder->guts->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
389 encoder->guts->metadata.data.stream_info.sample_rate = encoder->sample_rate;
390 encoder->guts->metadata.data.stream_info.channels = encoder->channels;
391 encoder->guts->metadata.data.stream_info.bits_per_sample = encoder->bits_per_sample;
392 encoder->guts->metadata.data.stream_info.total_samples = encoder->total_samples_estimate; /* we will replace this later with the real total */
393 memset(encoder->guts->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
394 MD5Init(&encoder->guts->md5context);
395 if(!FLAC__add_metadata_block(&encoder->guts->metadata, &encoder->guts->frame))
396 return encoder->state = FLAC__ENCODER_FRAMING_ERROR;
398 /* add a PADDING block if requested */
399 if(encoder->padding > 0) {
400 padding.type = FLAC__METADATA_TYPE_PADDING;
401 padding.is_last = true;
402 padding.length = encoder->padding;
403 if(!FLAC__add_metadata_block(&padding, &encoder->guts->frame))
404 return encoder->state = FLAC__ENCODER_FRAMING_ERROR;
407 assert(encoder->guts->frame.bits == 0); /* assert that we're byte-aligned before writing */
408 assert(encoder->guts->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */
409 if(encoder->guts->write_callback(encoder, encoder->guts->frame.buffer, encoder->guts->frame.bytes, 0, encoder->guts->current_frame_number, encoder->guts->client_data) != FLAC__ENCODER_WRITE_OK)
410 return encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_WRITING;
412 /* now that the metadata block is written, we can init this to an absurdly-high value... */
413 encoder->guts->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
414 /* ... and clear this to 0 */
415 encoder->guts->metadata.data.stream_info.total_samples = 0;
417 return encoder->state;
420 void FLAC__encoder_finish(FLAC__Encoder *encoder)
424 assert(encoder != 0);
425 if(encoder->state == FLAC__ENCODER_UNINITIALIZED)
427 if(encoder->guts->current_sample_number != 0) {
428 encoder->blocksize = encoder->guts->current_sample_number;
429 encoder_process_frame_(encoder, true); /* true => is last frame */
431 MD5Final(encoder->guts->metadata.data.stream_info.md5sum, &encoder->guts->md5context);
432 encoder->guts->metadata_callback(encoder, &encoder->guts->metadata, encoder->guts->client_data);
433 if(encoder->guts != 0) {
434 for(i = 0; i < encoder->channels; i++) {
435 if(encoder->guts->integer_signal[i] != 0) {
436 free(encoder->guts->integer_signal[i]);
437 encoder->guts->integer_signal[i] = 0;
439 if(encoder->guts->real_signal[i] != 0) {
440 free(encoder->guts->real_signal[i]);
441 encoder->guts->real_signal[i] = 0;
444 for(i = 0; i < 2; i++) {
445 if(encoder->guts->integer_signal_mid_side[i] != 0) {
446 free(encoder->guts->integer_signal_mid_side[i]);
447 encoder->guts->integer_signal_mid_side[i] = 0;
449 if(encoder->guts->real_signal_mid_side[i] != 0) {
450 free(encoder->guts->real_signal_mid_side[i]);
451 encoder->guts->real_signal_mid_side[i] = 0;
454 for(channel = 0; channel < encoder->channels; channel++) {
455 for(i = 0; i < 2; i++) {
456 if(encoder->guts->residual_workspace[channel][i] != 0) {
457 free(encoder->guts->residual_workspace[channel][i]);
458 encoder->guts->residual_workspace[channel][i] = 0;
462 for(channel = 0; channel < 2; channel++) {
463 for(i = 0; i < 2; i++) {
464 if(encoder->guts->residual_workspace_mid_side[channel][i] != 0) {
465 free(encoder->guts->residual_workspace_mid_side[channel][i]);
466 encoder->guts->residual_workspace_mid_side[channel][i] = 0;
470 if(encoder->guts->abs_residual != 0) {
471 free(encoder->guts->abs_residual);
472 encoder->guts->abs_residual = 0;
474 FLAC__bitbuffer_free(&encoder->guts->frame);
478 encoder->state = FLAC__ENCODER_UNINITIALIZED;
481 bool FLAC__encoder_process(FLAC__Encoder *encoder, const int32 *buf[], unsigned samples)
483 unsigned i, j, channel;
485 const bool ms = encoder->do_mid_side_stereo && encoder->channels == 2;
486 const int32 min_side = -((int64)1 << (encoder->bits_per_sample-1));
487 const int32 max_side = ((int64)1 << (encoder->bits_per_sample-1)) - 1;
489 assert(encoder != 0);
490 assert(encoder->state == FLAC__ENCODER_OK);
494 for(i = encoder->guts->current_sample_number; i < encoder->blocksize && j < samples; i++, j++) {
495 for(channel = 0; channel < encoder->channels; channel++) {
497 encoder->guts->integer_signal[channel][i] = x;
498 encoder->guts->real_signal[channel][i] = (real)x;
500 if(ms && encoder->guts->current_frame_can_do_mid_side) {
501 side = buf[0][j] - buf[1][j];
502 if(side < min_side || side > max_side) {
503 encoder->guts->current_frame_can_do_mid_side = false;
506 mid = (buf[0][j] + buf[1][j]) >> 1; /* NOTE: not the same as 'mid = (buf[0][j] + buf[1][j]) / 2' ! */
507 encoder->guts->integer_signal_mid_side[0][i] = mid;
508 encoder->guts->integer_signal_mid_side[1][i] = side;
509 encoder->guts->real_signal_mid_side[0][i] = (real)mid;
510 encoder->guts->real_signal_mid_side[1][i] = (real)side;
513 encoder->guts->current_sample_number++;
515 if(i == encoder->blocksize) {
516 if(!encoder_process_frame_(encoder, false)) /* false => not last frame */
519 } while(j < samples);
524 /* 'samples' is channel-wide samples, e.g. for 1 second at 44100Hz, 'samples' = 44100 regardless of the number of channels */
525 bool FLAC__encoder_process_interleaved(FLAC__Encoder *encoder, const int32 buf[], unsigned samples)
527 unsigned i, j, k, channel;
528 int32 x, left = 0, mid, side;
529 const bool ms = encoder->do_mid_side_stereo && encoder->channels == 2;
530 const int32 min_side = -((int64)1 << (encoder->bits_per_sample-1));
531 const int32 max_side = ((int64)1 << (encoder->bits_per_sample-1)) - 1;
533 assert(encoder != 0);
534 assert(encoder->state == FLAC__ENCODER_OK);
538 for(i = encoder->guts->current_sample_number; i < encoder->blocksize && j < samples; i++, j++, k++) {
539 for(channel = 0; channel < encoder->channels; channel++, k++) {
541 encoder->guts->integer_signal[channel][i] = x;
542 encoder->guts->real_signal[channel][i] = (real)x;
543 if(ms && encoder->guts->current_frame_can_do_mid_side) {
549 if(side < min_side || side > max_side) {
550 encoder->guts->current_frame_can_do_mid_side = false;
553 mid = (left + x) >> 1; /* NOTE: not the same as 'mid = (left + x) / 2' ! */
554 encoder->guts->integer_signal_mid_side[0][i] = mid;
555 encoder->guts->integer_signal_mid_side[1][i] = side;
556 encoder->guts->real_signal_mid_side[0][i] = (real)mid;
557 encoder->guts->real_signal_mid_side[1][i] = (real)side;
562 encoder->guts->current_sample_number++;
564 if(i == encoder->blocksize) {
565 if(!encoder_process_frame_(encoder, false)) /* false => not last frame */
568 } while(j < samples);
573 bool encoder_process_frame_(FLAC__Encoder *encoder, bool is_last_frame)
575 assert(encoder->state == FLAC__ENCODER_OK);
578 * Accumulate raw signal to the MD5 signature
580 if(!FLAC__MD5Accumulate(&encoder->guts->md5context, encoder->guts->integer_signal, encoder->channels, encoder->blocksize, (encoder->bits_per_sample+7) / 8)) {
581 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
586 * Process the frame header and subframes into the frame bitbuffer
588 if(!encoder_process_subframes_(encoder, is_last_frame)) {
589 /* the above function sets the state for us in case of an error */
594 * Zero-pad the frame to a byte_boundary
596 if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(&encoder->guts->frame)) {
597 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
604 assert(encoder->guts->frame.bits == 0); /* assert that we're byte-aligned before writing */
605 assert(encoder->guts->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */
606 if(encoder->guts->write_callback(encoder, encoder->guts->frame.buffer, encoder->guts->frame.bytes, encoder->blocksize, encoder->guts->current_frame_number, encoder->guts->client_data) != FLAC__ENCODER_WRITE_OK) {
607 encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_WRITING;
612 * Get ready for the next frame
614 encoder->guts->current_frame_can_do_mid_side = true;
615 encoder->guts->current_sample_number = 0;
616 encoder->guts->current_frame_number++;
617 encoder->guts->metadata.data.stream_info.total_samples += (uint64)encoder->blocksize;
618 encoder->guts->metadata.data.stream_info.min_framesize = min(encoder->guts->frame.bytes, encoder->guts->metadata.data.stream_info.min_framesize);
619 encoder->guts->metadata.data.stream_info.max_framesize = max(encoder->guts->frame.bytes, encoder->guts->metadata.data.stream_info.max_framesize);
624 bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame)
626 FLAC__FrameHeader frame_header;
627 unsigned channel, max_partition_order;
628 bool do_independent, do_mid_side;
631 * Calculate the max Rice partition order
634 max_partition_order = 0;
637 unsigned limit = 0, b = encoder->blocksize;
642 max_partition_order = min(encoder->rice_optimization_level, limit);
648 if(!FLAC__bitbuffer_clear(&encoder->guts->frame)) {
649 encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
652 frame_header.blocksize = encoder->blocksize;
653 frame_header.sample_rate = encoder->sample_rate;
654 frame_header.channels = encoder->channels;
655 frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
656 frame_header.bits_per_sample = encoder->bits_per_sample;
657 frame_header.number.frame_number = encoder->guts->current_frame_number;
660 * Figure out what channel assignments to try
662 if(encoder->do_mid_side_stereo) {
663 if(encoder->loose_mid_side_stereo) {
664 if(encoder->guts->loose_mid_side_stereo_frame_count == 0) {
665 do_independent = true;
669 do_independent = (encoder->guts->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
670 do_mid_side = !do_independent;
674 do_independent = true;
679 do_independent = true;
682 if(do_mid_side && !encoder->guts->current_frame_can_do_mid_side) {
683 do_independent = true;
687 assert(do_independent || do_mid_side);
690 * First do a normal encoding pass of each independent channel
693 for(channel = 0; channel < encoder->channels; channel++) {
694 if(!encoder_process_subframe_(encoder, max_partition_order, false, &frame_header, encoder->bits_per_sample, encoder->guts->integer_signal[channel], encoder->guts->real_signal[channel], encoder->guts->subframe_workspace_ptr[channel], encoder->guts->residual_workspace[channel], encoder->guts->best_subframe+channel, encoder->guts->best_subframe_bits+channel))
700 * Now do mid and side channels if requested
703 assert(encoder->channels == 2);
705 for(channel = 0; channel < 2; channel++) {
706 if(!encoder_process_subframe_(encoder, max_partition_order, false, &frame_header, encoder->bits_per_sample+(channel==0? 0:1), encoder->guts->integer_signal_mid_side[channel], encoder->guts->real_signal_mid_side[channel], encoder->guts->subframe_workspace_ptr_mid_side[channel], encoder->guts->residual_workspace_mid_side[channel], encoder->guts->best_subframe_mid_side+channel, encoder->guts->best_subframe_bits_mid_side+channel))
712 * Compose the frame bitbuffer
715 FLAC__ChannelAssignment channel_assignment;
717 assert(encoder->channels == 2);
719 if(encoder->loose_mid_side_stereo && encoder->guts->loose_mid_side_stereo_frame_count > 0) {
720 channel_assignment = (encoder->guts->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE);
723 unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
725 FLAC__ChannelAssignment ca;
727 assert(do_independent && do_mid_side);
729 /* We have to figure out which channel assignent results in the smallest frame */
730 bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->guts->best_subframe_bits [0] + encoder->guts->best_subframe_bits [1];
731 bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE ] = encoder->guts->best_subframe_bits [0] + encoder->guts->best_subframe_bits_mid_side[1];
732 bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->guts->best_subframe_bits [1] + encoder->guts->best_subframe_bits_mid_side[1];
733 bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE ] = encoder->guts->best_subframe_bits_mid_side[0] + encoder->guts->best_subframe_bits_mid_side[1];
735 for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) {
736 if(bits[ca] < min_bits) {
738 channel_assignment = ca;
743 frame_header.channel_assignment = channel_assignment;
745 if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame)) {
746 encoder->state = FLAC__ENCODER_FRAMING_ERROR;
750 switch(channel_assignment) {
751 /* note that encoder_add_subframe_ sets the state for us in case of an error */
752 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
753 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [0][encoder->guts->best_subframe [0]], &encoder->guts->frame))
755 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [1][encoder->guts->best_subframe [1]], &encoder->guts->frame))
758 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
759 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [0][encoder->guts->best_subframe [0]], &encoder->guts->frame))
761 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample+1, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame))
764 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
765 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample+1, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame))
767 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [1][encoder->guts->best_subframe [1]], &encoder->guts->frame))
770 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
771 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace_mid_side[0][encoder->guts->best_subframe_mid_side[0]], &encoder->guts->frame))
773 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample+1, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame))
781 if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame)) {
782 encoder->state = FLAC__ENCODER_FRAMING_ERROR;
786 for(channel = 0; channel < encoder->channels; channel++) {
787 if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample, &encoder->guts->subframe_workspace[channel][encoder->guts->best_subframe[channel]], &encoder->guts->frame)) {
788 /* the above function sets the state for us in case of an error */
794 if(encoder->loose_mid_side_stereo) {
795 encoder->guts->loose_mid_side_stereo_frame_count++;
796 if(encoder->guts->loose_mid_side_stereo_frame_count >= encoder->guts->loose_mid_side_stereo_frames)
797 encoder->guts->loose_mid_side_stereo_frame_count = 0;
800 encoder->guts->last_channel_assignment = frame_header.channel_assignment;
805 bool encoder_process_subframe_(FLAC__Encoder *encoder, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits)
807 real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
808 real lpc_residual_bits_per_sample;
809 real autoc[FLAC__MAX_LPC_ORDER+1];
810 real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER];
811 real lpc_error[FLAC__MAX_LPC_ORDER];
812 unsigned min_lpc_order, max_lpc_order, lpc_order;
813 unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
814 unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
815 unsigned rice_parameter;
816 unsigned _candidate_bits, _best_bits;
817 unsigned _best_subframe;
819 /* verbatim subframe is the baseline against which we measure other compressed subframes */
821 _best_bits = encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, bits_per_sample, subframe[_best_subframe]);
823 if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
824 /* check for constant subframe */
825 guess_fixed_order = FLAC__fixed_compute_best_predictor(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample);
826 if(fixed_residual_bits_per_sample[1] == 0.0) {
827 /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
828 unsigned i, signal_is_constant = true;
829 for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
830 if(integer_signal[0] != integer_signal[i]) {
831 signal_is_constant = false;
835 if(signal_is_constant) {
836 _candidate_bits = encoder_evaluate_constant_subframe_(integer_signal[0], bits_per_sample, subframe[!_best_subframe]);
837 if(_candidate_bits < _best_bits) {
838 _best_subframe = !_best_subframe;
839 _best_bits = _candidate_bits;
845 if(encoder->do_exhaustive_model_search) {
847 max_fixed_order = FLAC__MAX_FIXED_ORDER;
850 min_fixed_order = max_fixed_order = guess_fixed_order;
852 for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
853 if(fixed_residual_bits_per_sample[fixed_order] >= (real)bits_per_sample)
854 continue; /* don't even try */
855 rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+0.5) : 0; /* 0.5 is for rounding */
856 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
857 if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
858 rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
859 _candidate_bits = encoder_evaluate_fixed_subframe_(integer_signal, residual[!_best_subframe], encoder->guts->abs_residual, frame_header->blocksize, bits_per_sample, fixed_order, rice_parameter, max_partition_order, subframe[!_best_subframe]);
860 if(_candidate_bits < _best_bits) {
861 _best_subframe = !_best_subframe;
862 _best_bits = _candidate_bits;
867 if(encoder->max_lpc_order > 0) {
868 if(encoder->max_lpc_order >= frame_header->blocksize)
869 max_lpc_order = frame_header->blocksize-1;
871 max_lpc_order = encoder->max_lpc_order;
872 if(max_lpc_order > 0) {
873 FLAC__lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc);
874 FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error);
875 if(encoder->do_exhaustive_model_search) {
879 unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, bits_per_sample);
880 min_lpc_order = max_lpc_order = guess_lpc_order;
882 if(encoder->do_qlp_coeff_prec_search) {
883 min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
884 max_qlp_coeff_precision = min(32 - bits_per_sample - 1, (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)-1);
887 min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->qlp_coeff_precision;
889 for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
890 lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order);
891 if(lpc_residual_bits_per_sample >= (real)bits_per_sample)
892 continue; /* don't even try */
893 rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */
894 rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */
895 if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
896 rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
897 for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
898 _candidate_bits = encoder_evaluate_lpc_subframe_(integer_signal, residual[!_best_subframe], encoder->guts->abs_residual, lp_coeff[lpc_order-1], frame_header->blocksize, bits_per_sample, lpc_order, qlp_coeff_precision, rice_parameter, max_partition_order, subframe[!_best_subframe]);
899 if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
900 if(_candidate_bits < _best_bits) {
901 _best_subframe = !_best_subframe;
902 _best_bits = _candidate_bits;
912 *best_subframe = _best_subframe;
913 *best_bits = _best_bits;
918 bool encoder_add_subframe_(FLAC__Encoder *encoder, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame)
920 switch(subframe->type) {
921 case FLAC__SUBFRAME_TYPE_CONSTANT:
922 if(!FLAC__subframe_add_constant(&(subframe->data.constant), bits_per_sample, frame)) {
923 encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
927 case FLAC__SUBFRAME_TYPE_FIXED:
928 if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, bits_per_sample, frame)) {
929 encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
933 case FLAC__SUBFRAME_TYPE_LPC:
934 if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, bits_per_sample, frame)) {
935 encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
939 case FLAC__SUBFRAME_TYPE_VERBATIM:
940 if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, bits_per_sample, frame)) {
941 encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
952 unsigned encoder_evaluate_constant_subframe_(const int32 signal, unsigned bits_per_sample, FLAC__Subframe *subframe)
954 subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT;
955 subframe->data.constant.value = signal;
957 return FLAC__SUBFRAME_TYPE_LEN + bits_per_sample;
960 unsigned encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe)
962 unsigned i, residual_bits;
963 const unsigned residual_samples = blocksize - order;
965 FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual);
967 subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
969 subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
970 subframe->data.fixed.residual = residual;
972 residual_bits = encoder_find_best_partition_order_(residual, abs_residual, residual_samples, order, rice_parameter, max_partition_order, &subframe->data.fixed.entropy_coding_method.data.partitioned_rice.order, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.parameters);
974 subframe->data.fixed.order = order;
975 for(i = 0; i < order; i++)
976 subframe->data.fixed.warmup[i] = signal[i];
978 return FLAC__SUBFRAME_TYPE_LEN + (order * bits_per_sample) + residual_bits;
981 unsigned encoder_evaluate_lpc_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], const real lp_coeff[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe)
983 int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
984 unsigned i, residual_bits;
985 int quantization, ret;
986 const unsigned residual_samples = blocksize - order;
988 ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, bits_per_sample, qlp_coeff, &quantization);
990 return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */
992 FLAC__lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual);
994 subframe->type = FLAC__SUBFRAME_TYPE_LPC;
996 subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
997 subframe->data.lpc.residual = residual;
999 residual_bits = encoder_find_best_partition_order_(residual, abs_residual, residual_samples, order, rice_parameter, max_partition_order, &subframe->data.lpc.entropy_coding_method.data.partitioned_rice.order, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.parameters);
1001 subframe->data.lpc.order = order;
1002 subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision;
1003 subframe->data.lpc.quantization_level = quantization;
1004 memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(int32)*FLAC__MAX_LPC_ORDER);
1005 for(i = 0; i < order; i++)
1006 subframe->data.lpc.warmup[i] = signal[i];
1008 return FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN + FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN + (order * (qlp_coeff_precision + bits_per_sample)) + residual_bits;
1011 unsigned encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe)
1013 subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
1015 subframe->data.verbatim.data = signal;
1017 return FLAC__SUBFRAME_TYPE_LEN + (blocksize * bits_per_sample);
1020 unsigned encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned max_partition_order, unsigned *best_partition_order, unsigned best_parameters[])
1022 unsigned residual_bits, best_residual_bits = 0;
1023 unsigned i, partition_order;
1024 unsigned best_parameters_index = 0, parameters[2][1 << FLAC__MAX_RICE_PARTITION_ORDER];
1027 /* compute the abs(residual) for use later */
1028 for(i = 0; i < residual_samples; i++) {
1030 abs_residual[i] = (uint32)(r<0? -r : r);
1033 for(partition_order = 0; partition_order <= max_partition_order; partition_order++) {
1034 if(!encoder_set_partitioned_rice_(abs_residual, residual_samples, predictor_order, rice_parameter, partition_order, parameters[!best_parameters_index], &residual_bits)) {
1035 assert(best_residual_bits != 0);
1038 if(best_residual_bits == 0 || residual_bits < best_residual_bits) {
1039 best_residual_bits = residual_bits;
1040 *best_partition_order = partition_order;
1041 best_parameters_index = !best_parameters_index;
1044 memcpy(best_parameters, parameters[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order)));
1046 return best_residual_bits;
1049 #ifdef ESTIMATE_RICE_BITS
1050 #undef ESTIMATE_RICE_BITS
1052 #define ESTIMATE_RICE_BITS(value, parameter) ((value) >> (parameter))
1054 bool encoder_set_partitioned_rice_(const uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned rice_parameter, const unsigned partition_order, unsigned parameters[], unsigned *bits)
1056 unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
1058 if(partition_order == 0) {
1060 #ifdef ESTIMATE_RICE_BITS
1061 const unsigned rice_parameter_estimate = rice_parameter-1;
1062 bits_ += (1+rice_parameter) * residual_samples;
1064 parameters[0] = rice_parameter;
1065 bits_ += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1066 for(i = 0; i < residual_samples; i++)
1067 #ifdef ESTIMATE_RICE_BITS
1068 bits_ += ESTIMATE_RICE_BITS(abs_residual[i], rice_parameter_estimate);
1070 bits_ += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter);
1074 unsigned i, j, k = 0, k_last = 0;
1075 unsigned mean, parameter, partition_samples;
1076 const unsigned max_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
1077 for(i = 0; i < (1u<<partition_order); i++) {
1078 partition_samples = (residual_samples+predictor_order) >> partition_order;
1080 if(partition_samples <= predictor_order)
1083 partition_samples -= predictor_order;
1085 mean = partition_samples >> 1;
1086 for(j = 0; j < partition_samples; j++, k++)
1087 mean += abs_residual[k];
1088 mean /= partition_samples;
1089 /* calc parameter = floor(log2(mean)) + 1 */
1095 if(parameter > max_parameter)
1096 parameter = max_parameter;
1097 parameters[i] = parameter;
1098 bits_ += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
1099 #ifdef ESTIMATE_RICE_BITS
1100 bits_ += (1+parameter) * partition_samples;
1103 for(j = k_last; j < k; j++)
1104 #ifdef ESTIMATE_RICE_BITS
1105 bits_ += ESTIMATE_RICE_BITS(abs_residual[j], parameter);
1107 bits_ += FLAC__bitbuffer_rice_bits(residual[j], parameter);