int32 *integer_signal_mid_side[2]; /* the integer version of the mid-side input signal (stereo only) */
real *real_signal[FLAC__MAX_CHANNELS]; /* the floating-point version of the input signal */
real *real_signal_mid_side[2]; /* the floating-point version of the mid-side input signal (stereo only) */
- int32 *residual[2]; /* where the candidate and best subframe residual signals will be stored */
+ int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */
+ int32 *residual_workspace_mid_side[2][2];
+ FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2];
+ FLAC__Subframe subframe_workspace_mid_side[2][2];
+ FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2];
+ FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2];
+ unsigned best_subframe[FLAC__MAX_CHANNELS]; /* index into the above workspaces */
+ unsigned best_subframe_mid_side[2];
+ unsigned best_subframe_bits[FLAC__MAX_CHANNELS]; /* size in bits of the best subframe for each channel */
+ unsigned best_subframe_bits_mid_side[2];
uint32 *abs_residual; /* workspace where the abs(candidate residual) is stored */
- unsigned best_residual; /* index into the above */
FLAC__BitBuffer frame; /* the current frame being worked on */
- FLAC__BitBuffer frame_mid_side; /* special parallel workspace for the mid-side coded version of the current frame */
- FLAC__BitBuffer frame_left_side; /* special parallel workspace for the left-side coded version of the current frame */
- FLAC__BitBuffer frame_right_side; /* special parallel workspace for the right-side coded version of the current frame */
- FLAC__Subframe best_subframe, candidate_subframe;
bool current_frame_can_do_mid_side; /* encoder sets this false when any given sample of a frame's side channel exceeds 16 bits */
FLAC__StreamMetaData metadata;
unsigned current_sample_number;
static bool encoder_resize_buffers_(FLAC__Encoder *encoder, unsigned new_size);
static bool encoder_process_frame_(FLAC__Encoder *encoder, bool is_last_frame);
-static bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned channels, const int32 *integer_signal[], const real *real_signal[], FLAC__BitBuffer *bitbuffer);
+static bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame);
+static bool encoder_process_subframe_(FLAC__Encoder *encoder, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits);
+static bool encoder_add_subframe_(FLAC__Encoder *encoder, const FLAC__FrameHeader *frame_header, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame);
static unsigned encoder_evaluate_constant_subframe_(const int32 signal, unsigned bits_per_sample, FLAC__Subframe *subframe);
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);
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);
-static unsigned encoder_evaluate_verbatim_subframe_(unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe);
+static unsigned encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe);
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[]);
-static void encoder_promote_candidate_subframe_(FLAC__Encoder *encoder);
+#if 0
+@@@
+static void encoder_promote_candidate_subframe_(FLAC__Subframe *best_subframe, FLAC__Subframe *candidata_subframe, unsigned *best_residual);
+#endif
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);
const char *FLAC__EncoderWriteStatusString[] = {
bool encoder_resize_buffers_(FLAC__Encoder *encoder, unsigned new_size)
{
bool ok;
- unsigned i;
+ unsigned i, channel;
int32 *previous_is, *current_is;
real *previous_rs, *current_rs;
int32 *residual;
}
}
if(ok) {
- for(i = 0; i < 2; i++) {
- residual = (int32*)malloc(sizeof(int32) * new_size);
- if(0 == residual) {
- encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
- ok = 0;
+ for(channel = 0; channel < encoder->channels; channel++) {
+ for(i = 0; i < 2; i++) {
+ residual = (int32*)malloc(sizeof(int32) * new_size);
+ if(0 == residual) {
+ encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
+ ok = 0;
+ }
+ else {
+ if(encoder->guts->residual_workspace[channel][i] != 0)
+ free(encoder->guts->residual_workspace[channel][i]);
+ encoder->guts->residual_workspace[channel][i] = residual;
+ }
}
- else {
- if(encoder->guts->residual[i] != 0)
- free(encoder->guts->residual[i]);
- encoder->guts->residual[i] = residual;
+ }
+ for(channel = 0; channel < 2; channel++) {
+ for(i = 0; i < 2; i++) {
+ residual = (int32*)malloc(sizeof(int32) * new_size);
+ if(0 == residual) {
+ encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
+ ok = 0;
+ }
+ else {
+ if(encoder->guts->residual_workspace_mid_side[channel][i] != 0)
+ free(encoder->guts->residual_workspace_mid_side[channel][i]);
+ encoder->guts->residual_workspace_mid_side[channel][i] = residual;
+ }
}
}
abs_residual = (uint32*)malloc(sizeof(uint32) * new_size);
encoder->guts->integer_signal_mid_side[i] = 0;
encoder->guts->real_signal_mid_side[i] = 0;
}
- encoder->guts->residual[0] = 0;
- encoder->guts->residual[1] = 0;
+ for(i = 0; i < encoder->channels; i++) {
+ encoder->guts->residual_workspace[i][0] = encoder->guts->residual_workspace[i][1] = 0;
+ encoder->guts->best_subframe[i] = 0;
+ }
+ for(i = 0; i < 2; i++) {
+ encoder->guts->residual_workspace_mid_side[i][0] = encoder->guts->residual_workspace_mid_side[i][1] = 0;
+ encoder->guts->best_subframe_mid_side[i] = 0;
+ }
+ for(i = 0; i < encoder->channels; i++) {
+ encoder->guts->subframe_workspace_ptr[i][0] = &encoder->guts->subframe_workspace[i][0];
+ encoder->guts->subframe_workspace_ptr[i][1] = &encoder->guts->subframe_workspace[i][1];
+ }
+ for(i = 0; i < 2; i++) {
+ encoder->guts->subframe_workspace_ptr_mid_side[i][0] = &encoder->guts->subframe_workspace_mid_side[i][0];
+ encoder->guts->subframe_workspace_ptr_mid_side[i][1] = &encoder->guts->subframe_workspace_mid_side[i][1];
+ }
encoder->guts->abs_residual = 0;
- encoder->guts->best_residual = 0;
encoder->guts->current_frame_can_do_mid_side = true;
encoder->guts->current_sample_number = 0;
encoder->guts->current_frame_number = 0;
void FLAC__encoder_finish(FLAC__Encoder *encoder)
{
- unsigned i;
+ unsigned i, channel;
assert(encoder != 0);
if(encoder->state == FLAC__ENCODER_UNINITIALIZED)
encoder->guts->real_signal_mid_side[i] = 0;
}
}
- for(i = 0; i < 2; i++) {
- if(encoder->guts->residual[i] != 0) {
- free(encoder->guts->residual[i]);
- encoder->guts->residual[i] = 0;
+ for(channel = 0; channel < encoder->channels; channel++) {
+ for(i = 0; i < 2; i++) {
+ if(encoder->guts->residual_workspace[channel][i] != 0) {
+ free(encoder->guts->residual_workspace[channel][i]);
+ encoder->guts->residual_workspace[channel][i] = 0;
+ }
+ }
+ }
+ for(channel = 0; channel < 2; channel++) {
+ for(i = 0; i < 2; i++) {
+ if(encoder->guts->residual_workspace_mid_side[channel][i] != 0) {
+ free(encoder->guts->residual_workspace_mid_side[channel][i]);
+ encoder->guts->residual_workspace_mid_side[channel][i] = 0;
+ }
}
}
if(encoder->guts->abs_residual != 0) {
bool encoder_process_frame_(FLAC__Encoder *encoder, bool is_last_frame)
{
- FLAC__FrameHeader frame_header;
- FLAC__BitBuffer *smallest_frame;
-
assert(encoder->state == FLAC__ENCODER_OK);
/*
}
/*
- * First do a normal encoding pass
+ * Process the frame header and subframes into the frame bitbuffer
*/
- frame_header.blocksize = encoder->blocksize;
- frame_header.sample_rate = encoder->sample_rate;
- frame_header.channels = encoder->channels;
- frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
- frame_header.bits_per_sample = encoder->bits_per_sample;
- frame_header.number.frame_number = encoder->guts->current_frame_number;
-
- if(!FLAC__bitbuffer_clear(&encoder->guts->frame)) {
- encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
- return false;
- }
- if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame)) {
- encoder->state = FLAC__ENCODER_FRAMING_ERROR;
+ if(!encoder_process_subframes_(encoder, is_last_frame)) {
+ /* the above function sets the state for us in case of an error */
return false;
}
- if(!encoder_process_subframes_(encoder, is_last_frame, encoder->force_mid_side_stereo, &frame_header, encoder->channels, encoder->guts->integer_signal, encoder->guts->real_signal, &encoder->guts->frame))
- return false;
-
- smallest_frame = &encoder->guts->frame;
-
- /*
- * Now try a mid-side version if necessary; otherwise, just use the previous step's frame
- */
- if(encoder->do_mid_side_stereo && encoder->guts->current_frame_can_do_mid_side) {
- int32 *integer_signal[2];
- real *real_signal[2];
-
- assert(encoder->channels == 2);
-
- /* mid-side */
- frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
- if(!FLAC__bitbuffer_clear(&encoder->guts->frame_mid_side)) {
- encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
- return false;
- }
- if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame_mid_side)) {
- encoder->state = FLAC__ENCODER_FRAMING_ERROR;
- return false;
- }
- integer_signal[0] = encoder->guts->integer_signal_mid_side[0]; /* mid channel */
- integer_signal[1] = encoder->guts->integer_signal_mid_side[1]; /* side channel */
- real_signal[0] = encoder->guts->real_signal_mid_side[0]; /* mid channel */
- real_signal[1] = encoder->guts->real_signal_mid_side[1]; /* side channel */
- if(!encoder_process_subframes_(encoder, is_last_frame, false, &frame_header, encoder->channels, integer_signal, real_signal, &encoder->guts->frame_mid_side))
- return false;
- if(encoder->guts->frame_mid_side.total_bits < smallest_frame->total_bits)
- smallest_frame = &encoder->guts->frame_mid_side;
-
- if(!encoder->force_mid_side_stereo) {
- /* left-side */
- frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
- if(!FLAC__bitbuffer_clear(&encoder->guts->frame_left_side)) {
- encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
- return false;
- }
- if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame_left_side)) {
- encoder->state = FLAC__ENCODER_FRAMING_ERROR;
- return false;
- }
- integer_signal[0] = encoder->guts->integer_signal[0]; /* left channel */
- integer_signal[1] = encoder->guts->integer_signal_mid_side[1]; /* side channel */
- real_signal[0] = encoder->guts->real_signal[0]; /* left channel */
- real_signal[1] = encoder->guts->real_signal_mid_side[1]; /* side channel */
- if(!encoder_process_subframes_(encoder, is_last_frame, false, &frame_header, encoder->channels, integer_signal, real_signal, &encoder->guts->frame_left_side))
- return false;
- if(encoder->guts->frame_left_side.total_bits < smallest_frame->total_bits)
- smallest_frame = &encoder->guts->frame_left_side;
-
- /* right-side */
- frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
- if(!FLAC__bitbuffer_clear(&encoder->guts->frame_right_side)) {
- encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
- return false;
- }
- if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame_right_side)) {
- encoder->state = FLAC__ENCODER_FRAMING_ERROR;
- return false;
- }
- integer_signal[0] = encoder->guts->integer_signal_mid_side[1]; /* side channel */
- integer_signal[1] = encoder->guts->integer_signal[1]; /* right channel */
- real_signal[0] = encoder->guts->real_signal_mid_side[1]; /* side channel */
- real_signal[1] = encoder->guts->real_signal[1]; /* right channel */
- if(!encoder_process_subframes_(encoder, is_last_frame, false, &frame_header, encoder->channels, integer_signal, real_signal, &encoder->guts->frame_right_side))
- return false;
- if(encoder->guts->frame_right_side.total_bits < smallest_frame->total_bits)
- smallest_frame = &encoder->guts->frame_right_side;
- }
- }
-
/*
* Zero-pad the frame to a byte_boundary
*/
- if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(smallest_frame)) {
+ if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(&encoder->guts->frame)) {
encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
return false;
}
/*
* Write it
*/
- assert(smallest_frame->bits == 0); /* assert that we're byte-aligned before writing */
- assert(smallest_frame->total_consumed_bits == 0); /* assert that no reading of the buffer was done */
- if(encoder->guts->write_callback(encoder, smallest_frame->buffer, smallest_frame->bytes, encoder->blocksize, encoder->guts->current_frame_number, encoder->guts->client_data) != FLAC__ENCODER_WRITE_OK) {
+ assert(encoder->guts->frame.bits == 0); /* assert that we're byte-aligned before writing */
+ assert(encoder->guts->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */
+ 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) {
encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_WRITING;
return false;
}
encoder->guts->current_sample_number = 0;
encoder->guts->current_frame_number++;
encoder->guts->metadata.data.encoding.total_samples += (uint64)encoder->blocksize;
- encoder->guts->metadata.data.encoding.min_framesize = min(smallest_frame->bytes, encoder->guts->metadata.data.encoding.min_framesize);
- encoder->guts->metadata.data.encoding.max_framesize = max(smallest_frame->bytes, encoder->guts->metadata.data.encoding.max_framesize);
+ encoder->guts->metadata.data.encoding.min_framesize = min(encoder->guts->frame.bytes, encoder->guts->metadata.data.encoding.min_framesize);
+ encoder->guts->metadata.data.encoding.max_framesize = max(encoder->guts->frame.bytes, encoder->guts->metadata.data.encoding.max_framesize);
return true;
}
-bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned channels, const int32 *integer_signal[], const real *real_signal[], FLAC__BitBuffer *frame)
+bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame)
{
- real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
- real lpc_residual_bits_per_sample;
- real autoc[FLAC__MAX_LPC_ORDER+1];
- real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER];
- real lpc_error[FLAC__MAX_LPC_ORDER];
- unsigned channel;
- unsigned min_lpc_order, max_lpc_order, lpc_order;
- unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
- unsigned max_partition_order;
- unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
- unsigned rice_parameter;
- unsigned candidate_bits, best_bits;
+ FLAC__FrameHeader frame_header;
+ unsigned channel, max_partition_order;
+ /*
+ * Calculate the max Rice partition order
+ */
if(is_last_frame) {
max_partition_order = 0;
}
max_partition_order = min(encoder->rice_optimization_level, limit);
}
- for(channel = 0; channel < channels; channel++) {
- /* verbatim subframe is the baseline against which we measure other compressed subframes */
- best_bits = encoder_evaluate_verbatim_subframe_(frame_header->blocksize, frame_header->bits_per_sample, &(encoder->guts->best_subframe));
+ /*
+ * Setup the frame
+ */
+ if(!FLAC__bitbuffer_clear(&encoder->guts->frame)) {
+ encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR;
+ return false;
+ }
+ frame_header.blocksize = encoder->blocksize;
+ frame_header.sample_rate = encoder->sample_rate;
+ frame_header.channels = encoder->channels;
+ frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
+ frame_header.bits_per_sample = encoder->bits_per_sample;
+ frame_header.number.frame_number = encoder->guts->current_frame_number;
- if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
- /* check for constant subframe */
- guess_fixed_order = FLAC__fixed_compute_best_predictor(integer_signal[channel]+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample);
- if(fixed_residual_bits_per_sample[1] == 0.0) {
- /* the above means integer_signal[channel]+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
- unsigned i, signal_is_constant = true;
- for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
- if(integer_signal[channel][0] != integer_signal[channel][i]) {
- signal_is_constant = false;
- break;
- }
+ /*
+ * First do a normal encoding pass of each independent channel
+ */
+ for(channel = 0; channel < encoder->channels; channel++) {
+ if(!encoder_process_subframe_(encoder, max_partition_order, encoder->force_mid_side_stereo, &frame_header, 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))
+ return false;
+ }
+
+ /*
+ * Now do mid and side channels if requested
+ */
+ if(encoder->do_mid_side_stereo && encoder->guts->current_frame_can_do_mid_side) {
+ assert(encoder->channels == 2);
+
+ for(channel = 0; channel < 2; channel++) {
+ if(!encoder_process_subframe_(encoder, max_partition_order, false, &frame_header, 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))
+ return false;
+ }
+ }
+
+ /*
+ * Compose the frame bitbuffer
+ */
+ if(encoder->do_mid_side_stereo && encoder->guts->current_frame_can_do_mid_side) {
+ unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */
+ unsigned min_bits;
+ FLAC__ChannelAssignment ca, min_assignment;
+ assert(encoder->channels == 2);
+
+ /* We have to figure out which channel assignent results in the smallest frame */
+ bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->guts->best_subframe_bits [0] + encoder->guts->best_subframe_bits [1];
+ bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE ] = encoder->guts->best_subframe_bits [0] + encoder->guts->best_subframe_bits_mid_side[1];
+ bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->guts->best_subframe_bits [1] + encoder->guts->best_subframe_bits_mid_side[1];
+ bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE ] = encoder->guts->best_subframe_bits_mid_side[0] + encoder->guts->best_subframe_bits_mid_side[1];
+
+ for(min_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) {
+ if(bits[ca] < min_bits) {
+ min_bits = bits[ca];
+ min_assignment = ca;
+ }
+ }
+
+ frame_header.channel_assignment = min_assignment;
+
+ if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame)) {
+ encoder->state = FLAC__ENCODER_FRAMING_ERROR;
+ return false;
+ }
+
+ switch(min_assignment) {
+ /* note that encoder_add_subframe_ sets the state for us in case of an error */
+ case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace [0][encoder->guts->best_subframe [0]], &encoder->guts->frame))
+ return false;
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace [1][encoder->guts->best_subframe [1]], &encoder->guts->frame))
+ return false;
+ break;
+ case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace [0][encoder->guts->best_subframe [0]], &encoder->guts->frame))
+ return false;
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame))
+ return false;
+ break;
+ case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame))
+ return false;
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace [1][encoder->guts->best_subframe [1]], &encoder->guts->frame))
+ return false;
+ break;
+ case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace_mid_side[0][encoder->guts->best_subframe_mid_side[0]], &encoder->guts->frame))
+ return false;
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame))
+ return false;
+ break;
+ default:
+ assert(0);
+ }
+ }
+ else {
+ if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame)) {
+ encoder->state = FLAC__ENCODER_FRAMING_ERROR;
+ return false;
+ }
+
+ for(channel = 0; channel < encoder->channels; channel++) {
+ if(!encoder_add_subframe_(encoder, &frame_header, &encoder->guts->subframe_workspace[channel][encoder->guts->best_subframe[channel]], &encoder->guts->frame)) {
+ /* the above function sets the state for us in case of an error */
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+bool encoder_process_subframe_(FLAC__Encoder *encoder, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits)
+{
+ real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
+ real lpc_residual_bits_per_sample;
+ real autoc[FLAC__MAX_LPC_ORDER+1];
+ real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER];
+ real lpc_error[FLAC__MAX_LPC_ORDER];
+ unsigned min_lpc_order, max_lpc_order, lpc_order;
+ unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
+ unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
+ unsigned rice_parameter;
+ unsigned _candidate_bits, _best_bits;
+ unsigned _best_subframe;
+
+ /* verbatim subframe is the baseline against which we measure other compressed subframes */
+ _best_subframe = 0;
+ _best_bits = encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, frame_header->bits_per_sample, subframe[_best_subframe]);
+
+ if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
+ /* check for constant subframe */
+ 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);
+ if(fixed_residual_bits_per_sample[1] == 0.0) {
+ /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
+ unsigned i, signal_is_constant = true;
+ for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
+ if(integer_signal[0] != integer_signal[i]) {
+ signal_is_constant = false;
+ break;
}
- if(signal_is_constant) {
- candidate_bits = encoder_evaluate_constant_subframe_(integer_signal[channel][0], frame_header->bits_per_sample, &(encoder->guts->candidate_subframe));
- if(candidate_bits < best_bits) {
- encoder_promote_candidate_subframe_(encoder);
- best_bits = candidate_bits;
- }
+ }
+ if(signal_is_constant) {
+ _candidate_bits = encoder_evaluate_constant_subframe_(integer_signal[0], frame_header->bits_per_sample, subframe[!_best_subframe]);
+ if(_candidate_bits < _best_bits) {
+ _best_subframe = !_best_subframe;
+ _best_bits = _candidate_bits;
}
}
+ }
+ else {
+ /* encode fixed */
+ if(encoder->do_exhaustive_model_search) {
+ min_fixed_order = 0;
+ max_fixed_order = FLAC__MAX_FIXED_ORDER;
+ }
else {
- /* encode fixed */
- if(encoder->do_exhaustive_model_search) {
- min_fixed_order = 0;
- max_fixed_order = FLAC__MAX_FIXED_ORDER;
- }
- else {
- min_fixed_order = max_fixed_order = guess_fixed_order;
- }
- for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
- if(fixed_residual_bits_per_sample[fixed_order] >= (real)frame_header->bits_per_sample)
- continue; /* don't even try */
- /* 0.5 is for rounding, another 1.0 is to account for the signed->unsigned conversion during rice coding */
- rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+1.5) : 0;
- if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
- rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
- candidate_bits = encoder_evaluate_fixed_subframe_(integer_signal[channel], encoder->guts->residual[!encoder->guts->best_residual], encoder->guts->abs_residual, frame_header->blocksize, frame_header->bits_per_sample, fixed_order, rice_parameter, max_partition_order, &(encoder->guts->candidate_subframe));
- if(candidate_bits < best_bits) {
- encoder_promote_candidate_subframe_(encoder);
- best_bits = candidate_bits;
- }
+ min_fixed_order = max_fixed_order = guess_fixed_order;
+ }
+ for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
+ if(fixed_residual_bits_per_sample[fixed_order] >= (real)frame_header->bits_per_sample)
+ continue; /* don't even try */
+ /* 0.5 is for rounding, another 1.0 is to account for the signed->unsigned conversion during rice coding */
+ rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+1.5) : 0;
+ if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
+ rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
+ _candidate_bits = encoder_evaluate_fixed_subframe_(integer_signal, residual[!_best_subframe], encoder->guts->abs_residual, frame_header->blocksize, frame_header->bits_per_sample, fixed_order, rice_parameter, max_partition_order, subframe[!_best_subframe]);
+ if(_candidate_bits < _best_bits) {
+ _best_subframe = !_best_subframe;
+ _best_bits = _candidate_bits;
}
+ }
- /* encode lpc */
- if(encoder->max_lpc_order > 0) {
- if(encoder->max_lpc_order >= frame_header->blocksize)
- max_lpc_order = frame_header->blocksize-1;
- else
- max_lpc_order = encoder->max_lpc_order;
- if(max_lpc_order > 0) {
- FLAC__lpc_compute_autocorrelation(real_signal[channel], frame_header->blocksize, max_lpc_order+1, autoc);
- FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error);
- if(encoder->do_exhaustive_model_search) {
- min_lpc_order = 1;
- }
- else {
- unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, frame_header->bits_per_sample);
- min_lpc_order = max_lpc_order = guess_lpc_order;
- }
- if(encoder->do_qlp_coeff_prec_search) {
- min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
- max_qlp_coeff_precision = 32 - frame_header->bits_per_sample - 1;
- }
- else {
- min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->qlp_coeff_precision;
- }
- for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
- lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize);
- if(lpc_residual_bits_per_sample >= (real)frame_header->bits_per_sample)
- continue; /* don't even try */
- /* 0.5 is for rounding, another 1.0 is to account for the signed->unsigned conversion during rice coding */
- rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+1.5) : 0;
- if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
- rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
- for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
- candidate_bits = encoder_evaluate_lpc_subframe_(integer_signal[channel], encoder->guts->residual[!encoder->guts->best_residual], encoder->guts->abs_residual, lp_coeff[lpc_order-1], frame_header->blocksize, frame_header->bits_per_sample, lpc_order, qlp_coeff_precision, rice_parameter, max_partition_order, &(encoder->guts->candidate_subframe));
- if(candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
- if(candidate_bits < best_bits) {
- encoder_promote_candidate_subframe_(encoder);
- best_bits = candidate_bits;
- }
+ /* encode lpc */
+ if(encoder->max_lpc_order > 0) {
+ if(encoder->max_lpc_order >= frame_header->blocksize)
+ max_lpc_order = frame_header->blocksize-1;
+ else
+ max_lpc_order = encoder->max_lpc_order;
+ if(max_lpc_order > 0) {
+ FLAC__lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc);
+ FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error);
+ if(encoder->do_exhaustive_model_search) {
+ min_lpc_order = 1;
+ }
+ else {
+ unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, frame_header->bits_per_sample);
+ min_lpc_order = max_lpc_order = guess_lpc_order;
+ }
+ if(encoder->do_qlp_coeff_prec_search) {
+ min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
+ max_qlp_coeff_precision = 32 - frame_header->bits_per_sample - 1;
+ }
+ else {
+ min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->qlp_coeff_precision;
+ }
+ for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
+ lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize);
+ if(lpc_residual_bits_per_sample >= (real)frame_header->bits_per_sample)
+ continue; /* don't even try */
+ /* 0.5 is for rounding, another 1.0 is to account for the signed->unsigned conversion during rice coding */
+ rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+1.5) : 0;
+ if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
+ rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
+ for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
+ _candidate_bits = encoder_evaluate_lpc_subframe_(integer_signal, residual[!_best_subframe], encoder->guts->abs_residual, lp_coeff[lpc_order-1], frame_header->blocksize, frame_header->bits_per_sample, lpc_order, qlp_coeff_precision, rice_parameter, max_partition_order, subframe[!_best_subframe]);
+ if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
+ if(_candidate_bits < _best_bits) {
+ _best_subframe = !_best_subframe;
+ _best_bits = _candidate_bits;
}
}
}
}
}
}
+ }
- /* add the best subframe */
- switch(encoder->guts->best_subframe.type) {
- case FLAC__SUBFRAME_TYPE_CONSTANT:
- if(!FLAC__subframe_add_constant(&(encoder->guts->best_subframe.data.constant), frame_header->bits_per_sample, frame)) {
- encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
- return false;
- }
- break;
- case FLAC__SUBFRAME_TYPE_FIXED:
- encoder->guts->best_subframe.data.fixed.residual = encoder->guts->residual[encoder->guts->best_residual];
- if(!FLAC__subframe_add_fixed(&(encoder->guts->best_subframe.data.fixed), frame_header->blocksize - encoder->guts->best_subframe.data.fixed.order, frame_header->bits_per_sample, frame)) {
- encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
- return false;
- }
- break;
- case FLAC__SUBFRAME_TYPE_LPC:
- encoder->guts->best_subframe.data.lpc.residual = encoder->guts->residual[encoder->guts->best_residual];
- if(!FLAC__subframe_add_lpc(&(encoder->guts->best_subframe.data.lpc), frame_header->blocksize - encoder->guts->best_subframe.data.lpc.order, frame_header->bits_per_sample, frame)) {
- encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
- return false;
- }
- break;
- case FLAC__SUBFRAME_TYPE_VERBATIM:
- encoder->guts->best_subframe.data.verbatim.data = integer_signal[channel];
- if(!FLAC__subframe_add_verbatim(&(encoder->guts->best_subframe.data.verbatim), frame_header->blocksize, frame_header->bits_per_sample, frame)) {
- encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
- return false;
- }
- break;
- }
+ *best_subframe = _best_subframe;
+ *best_bits = _best_bits;
+
+ return true;
+}
+
+bool encoder_add_subframe_(FLAC__Encoder *encoder, const FLAC__FrameHeader *frame_header, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame)
+{
+ switch(subframe->type) {
+ case FLAC__SUBFRAME_TYPE_CONSTANT:
+ if(!FLAC__subframe_add_constant(&(subframe->data.constant), frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ case FLAC__SUBFRAME_TYPE_FIXED:
+ if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ case FLAC__SUBFRAME_TYPE_LPC:
+ if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ case FLAC__SUBFRAME_TYPE_VERBATIM:
+ if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ default:
+ assert(0);
}
return true;
subframe->type = FLAC__SUBFRAME_TYPE_FIXED;
subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
+ subframe->data.fixed.residual = residual;
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);
subframe->type = FLAC__SUBFRAME_TYPE_LPC;
subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE;
+ subframe->data.lpc.residual = residual;
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);
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;
}
-unsigned encoder_evaluate_verbatim_subframe_(unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe)
+unsigned encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe)
{
subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM;
+ subframe->data.verbatim.data = signal;
+
return FLAC__SUBFRAME_TYPE_LEN + (blocksize * bits_per_sample);
}
return best_residual_bits;
}
+#if 0
+@@@
void encoder_promote_candidate_subframe_(FLAC__Encoder *encoder)
{
assert(encoder->state == FLAC__ENCODER_OK);
encoder->guts->best_subframe = encoder->guts->candidate_subframe;
encoder->guts->best_residual = !encoder->guts->best_residual;
}
+#endif
#ifdef ESTIMATE_RICE_BITS
#undef ESTIMATE_RICE_BITS
*bits = bits_;
return true;
}
+
+#if 0
+@@@
+bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned channels, const int32 *integer_signal[], const real *real_signal[], FLAC__BitBuffer *frame)
+{
+ real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1];
+ real lpc_residual_bits_per_sample;
+ real autoc[FLAC__MAX_LPC_ORDER+1];
+ real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER];
+ real lpc_error[FLAC__MAX_LPC_ORDER];
+ unsigned channel;
+ unsigned min_lpc_order, max_lpc_order, lpc_order;
+ unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order;
+ unsigned max_partition_order;
+ unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision;
+ unsigned rice_parameter;
+ unsigned candidate_bits, best_bits;
+
+ if(is_last_frame) {
+ max_partition_order = 0;
+ }
+ else {
+ unsigned limit = 0, b = encoder->blocksize;
+ while(!(b & 1)) {
+ limit++;
+ b >>= 1;
+ }
+ max_partition_order = min(encoder->rice_optimization_level, limit);
+ }
+
+ for(channel = 0; channel < channels; channel++) {
+ /* verbatim subframe is the baseline against which we measure other compressed subframes */
+ best_bits = encoder_evaluate_verbatim_subframe_(frame_header->blocksize, frame_header->bits_per_sample, &(encoder->guts->best_subframe));
+
+ if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) {
+ /* check for constant subframe */
+ guess_fixed_order = FLAC__fixed_compute_best_predictor(integer_signal[channel]+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample);
+ if(fixed_residual_bits_per_sample[1] == 0.0) {
+ /* the above means integer_signal[channel]+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */
+ unsigned i, signal_is_constant = true;
+ for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) {
+ if(integer_signal[channel][0] != integer_signal[channel][i]) {
+ signal_is_constant = false;
+ break;
+ }
+ }
+ if(signal_is_constant) {
+ candidate_bits = encoder_evaluate_constant_subframe_(integer_signal[channel][0], frame_header->bits_per_sample, &(encoder->guts->candidate_subframe));
+ if(candidate_bits < best_bits) {
+ encoder_promote_candidate_subframe_(encoder);
+ best_bits = candidate_bits;
+ }
+ }
+ }
+ else {
+ /* encode fixed */
+ if(encoder->do_exhaustive_model_search) {
+ min_fixed_order = 0;
+ max_fixed_order = FLAC__MAX_FIXED_ORDER;
+ }
+ else {
+ min_fixed_order = max_fixed_order = guess_fixed_order;
+ }
+ for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) {
+ if(fixed_residual_bits_per_sample[fixed_order] >= (real)frame_header->bits_per_sample)
+ continue; /* don't even try */
+ /* 0.5 is for rounding, another 1.0 is to account for the signed->unsigned conversion during rice coding */
+ rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+1.5) : 0;
+ if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
+ rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
+ candidate_bits = encoder_evaluate_fixed_subframe_(integer_signal[channel], encoder->guts->residual[!encoder->guts->best_residual], encoder->guts->abs_residual, frame_header->blocksize, frame_header->bits_per_sample, fixed_order, rice_parameter, max_partition_order, &(encoder->guts->candidate_subframe));
+ if(candidate_bits < best_bits) {
+ encoder_promote_candidate_subframe_(encoder);
+ best_bits = candidate_bits;
+ }
+ }
+
+ /* encode lpc */
+ if(encoder->max_lpc_order > 0) {
+ if(encoder->max_lpc_order >= frame_header->blocksize)
+ max_lpc_order = frame_header->blocksize-1;
+ else
+ max_lpc_order = encoder->max_lpc_order;
+ if(max_lpc_order > 0) {
+ FLAC__lpc_compute_autocorrelation(real_signal[channel], frame_header->blocksize, max_lpc_order+1, autoc);
+ FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error);
+ if(encoder->do_exhaustive_model_search) {
+ min_lpc_order = 1;
+ }
+ else {
+ unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, frame_header->bits_per_sample);
+ min_lpc_order = max_lpc_order = guess_lpc_order;
+ }
+ if(encoder->do_qlp_coeff_prec_search) {
+ min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION;
+ max_qlp_coeff_precision = 32 - frame_header->bits_per_sample - 1;
+ }
+ else {
+ min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->qlp_coeff_precision;
+ }
+ for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) {
+ lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize);
+ if(lpc_residual_bits_per_sample >= (real)frame_header->bits_per_sample)
+ continue; /* don't even try */
+ /* 0.5 is for rounding, another 1.0 is to account for the signed->unsigned conversion during rice coding */
+ rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+1.5) : 0;
+ if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN))
+ rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1;
+ for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) {
+ candidate_bits = encoder_evaluate_lpc_subframe_(integer_signal[channel], encoder->guts->residual[!encoder->guts->best_residual], encoder->guts->abs_residual, lp_coeff[lpc_order-1], frame_header->blocksize, frame_header->bits_per_sample, lpc_order, qlp_coeff_precision, rice_parameter, max_partition_order, &(encoder->guts->candidate_subframe));
+ if(candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */
+ if(candidate_bits < best_bits) {
+ encoder_promote_candidate_subframe_(encoder);
+ best_bits = candidate_bits;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ /* add the best subframe */
+ switch(encoder->guts->best_subframe.type) {
+ case FLAC__SUBFRAME_TYPE_CONSTANT:
+ if(!FLAC__subframe_add_constant(&(encoder->guts->best_subframe.data.constant), frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ case FLAC__SUBFRAME_TYPE_FIXED:
+ encoder->guts->best_subframe.data.fixed.residual = encoder->guts->residual[encoder->guts->best_residual];
+ if(!FLAC__subframe_add_fixed(&(encoder->guts->best_subframe.data.fixed), frame_header->blocksize - encoder->guts->best_subframe.data.fixed.order, frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ case FLAC__SUBFRAME_TYPE_LPC:
+ encoder->guts->best_subframe.data.lpc.residual = encoder->guts->residual[encoder->guts->best_residual];
+ if(!FLAC__subframe_add_lpc(&(encoder->guts->best_subframe.data.lpc), frame_header->blocksize - encoder->guts->best_subframe.data.lpc.order, frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ case FLAC__SUBFRAME_TYPE_VERBATIM:
+ encoder->guts->best_subframe.data.verbatim.data = integer_signal[channel];
+ if(!FLAC__subframe_add_verbatim(&(encoder->guts->best_subframe.data.verbatim), frame_header->blocksize, frame_header->bits_per_sample, frame)) {
+ encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING;
+ return false;
+ }
+ break;
+ }
+ }
+
+ return true;
+}
+#endif
projects / platform / upstream / flac.git / commitdiff