oss-fuzz/encoder_v2.cc - platform/external/flac - Git at Google

 /* fuzzer_encoder_v2
  * Copyright (C) 2022-2023  Xiph.Org Foundation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * - Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
  * - Redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
  * documentation and/or other materials provided with the distribution.
  *
  * - Neither the name of the Xiph.org Foundation nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include <cstdlib>
 #include <cstring> /* for memcpy */
 #include "FLAC/stream_encoder.h"
 #include "FLAC/metadata.h"
 extern "C" {
 #include "share/private.h"
 }
 #include "common.h"

 /* This C++ fuzzer uses the FLAC and not FLAC++ because the latter lacks a few
  * hidden functions like FLAC__stream_encoder_disable_constant_subframes. It
  * is still processed by a C++ compiler because that's what oss-fuzz expects */


 static FLAC__StreamEncoderWriteStatus write_callback(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, uint32_t samples, uint32_t current_frame, void *client_data)
 {
 	(void)encoder, (void)buffer, (void)bytes, (void)samples, (void)current_frame, (void)client_data;
 	return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
 }

 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
 	FLAC__bool encoder_valid = true;
 	FLAC__StreamEncoder *encoder = 0;
 	FLAC__StreamEncoderState state;
 	FLAC__StreamMetadata *metadata[16] = {NULL};
 	unsigned num_metadata = 0;
 	FLAC__StreamMetadata_VorbisComment_Entry VorbisCommentField;

 	unsigned sample_rate, channels, bps;
 	uint64_t samples_estimate, samples_in_input;
 	unsigned compression_level, input_data_width, blocksize, max_lpc_order, qlp_coeff_precision, min_residual_partition_order, max_residual_partition_order, metadata_mask, instruction_set_disable_mask;
 	FLAC__bool ogg, write_to_file, interleaved;

 	FLAC__bool data_bools[24];

 	/* Set alloc threshold. This check was added later and no spare config
 	 * bytes were left, so we're reusing the sample rate as that of little
 	 * consequence to the encoder and decoder except reading the frame header */

 	if(size < 3)
 		return 0;
 	alloc_check_threshold = data[2];
 	alloc_check_counter = 0;

 	/* allocate the encoder */
 	if((encoder = FLAC__stream_encoder_new()) == NULL) {
 		fprintf(stderr, "ERROR: allocating encoder\n");
 		return 1;
 	}

 	/* Use first 20 byte for configuration */
 	if(size < 20){
 		FLAC__stream_encoder_delete(encoder);
 		return 0;
 	}

 	/* First 3 byte for sample rate, 4th byte for channels, 5th byte for bps */
 	sample_rate = ((unsigned)data[0] << 16) + ((unsigned)data[1] << 8) + data[2];
 	channels = data[3];
 	bps = data[4];

 	/* Number of samples estimate, format accepts 36-bit max */
 	samples_estimate = ((uint64_t)data[5] << 32) + ((unsigned)data[6] << 24) + ((unsigned)data[7] << 16) + ((unsigned)data[8] << 8) + data[9];

 	compression_level = data[10]&0b1111;
 	input_data_width = 1 + (data[10]>>4)%4;
 	samples_in_input = (size-20)/input_data_width;
 	blocksize = ((unsigned)data[11] << 8) + (unsigned)data[12];
 	max_lpc_order = data[13];
 	qlp_coeff_precision = data[14];
 	min_residual_partition_order = data[15] & 0b1111;
 	max_residual_partition_order = data[15] & 0b11110000;
 	metadata_mask = data[16];
 	instruction_set_disable_mask = data[17];

 	/* Get array of bools from configuration */
 	for(int i = 0; i < 16; i++)
 		data_bools[i] = data[18+i/8] & (1 << (i % 8));

 	ogg = data_bools[0];
 	interleaved = data_bools[1];
 	write_to_file = data_bools[13];

 	/* Set input and process parameters */
 	encoder_valid &= FLAC__stream_encoder_set_verify(encoder, data_bools[2]);
 	encoder_valid &= FLAC__stream_encoder_set_channels(encoder, channels);
 	encoder_valid &= FLAC__stream_encoder_set_bits_per_sample(encoder, bps);
 	encoder_valid &= FLAC__stream_encoder_set_sample_rate(encoder, sample_rate);
 	encoder_valid &= FLAC__stream_encoder_set_total_samples_estimate(encoder, samples_estimate);
 	encoder_valid &= FLAC__stream_encoder_disable_instruction_set(encoder, instruction_set_disable_mask);
 	encoder_valid &= FLAC__stream_encoder_set_limit_min_bitrate(encoder, data_bools[15]);

 	/* Set compression related parameters */
 	encoder_valid &= FLAC__stream_encoder_set_compression_level(encoder, compression_level);
 	if(data_bools[3]){
 		/* Bias towards regular compression levels */
 		encoder_valid &= FLAC__stream_encoder_set_blocksize(encoder, blocksize);
 		encoder_valid &= FLAC__stream_encoder_set_max_lpc_order(encoder, max_lpc_order);
 		encoder_valid &= FLAC__stream_encoder_set_qlp_coeff_precision(encoder, qlp_coeff_precision);
 		encoder_valid &= FLAC__stream_encoder_set_min_residual_partition_order(encoder, min_residual_partition_order);

 		/* With large inputs and expensive options enabled, the fuzzer can get *really* slow.
 		 * Some combinations can make the fuzzer timeout (>60 seconds). However, while combining
 		 * options makes the fuzzer slower, most options do not expose new code when combined.
 		 * Therefore, combining slow options is disabled for large inputs. Any input containing
 		 * more than 65536 * 2 samples (max blocksize, stereo) is considered large
 		 */
 		if(samples_in_input < (2*65536)) {
 			encoder_valid &= FLAC__stream_encoder_set_streamable_subset(encoder, data_bools[4]);
 			encoder_valid &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search(encoder, data_bools[5]);
 			encoder_valid &= FLAC__stream_encoder_set_do_escape_coding(encoder, data_bools[6]);
 			encoder_valid &= FLAC__stream_encoder_set_do_exhaustive_model_search(encoder, data_bools[7]);
 			/* Combining model search, precision search and a high residual partition order is especially
 			 * expensive, so limit that even further. This high partition order can only be set on
 			 * large blocksize and with streamable subset disabled */
 			if(samples_in_input < (2 * 4609) || data_bools[4] || !data_bools[7] || !data_bools[5] || max_residual_partition_order < 9 || blocksize < 4609)
 				encoder_valid &= FLAC__stream_encoder_set_max_residual_partition_order(encoder, max_residual_partition_order);
 		}
 		else {
 			if(!data_bools[4])
 				encoder_valid &= FLAC__stream_encoder_set_streamable_subset(encoder, false);
 			else if(data_bools[6])
 				encoder_valid &= FLAC__stream_encoder_set_do_escape_coding(encoder, true);
 			else if(data_bools[7])
 				encoder_valid &= FLAC__stream_encoder_set_do_exhaustive_model_search(encoder, true);
 			else if(data_bools[5])
 				encoder_valid &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search(encoder, true);
 		}
 		encoder_valid &= FLAC__stream_encoder_set_do_mid_side_stereo(encoder, data_bools[8]);
 		encoder_valid &= FLAC__stream_encoder_set_loose_mid_side_stereo(encoder, data_bools[9]);

 		encoder_valid &= FLAC__stream_encoder_disable_constant_subframes(encoder, data_bools[10]);
 		encoder_valid &= FLAC__stream_encoder_disable_fixed_subframes(encoder, data_bools[11]);
 		encoder_valid &= FLAC__stream_encoder_disable_verbatim_subframes(encoder, data_bools[12]);
 	}

 	/* Disable alloc check if requested */
 	if(encoder_valid && data_bools[14])
 		alloc_check_threshold = INT32_MAX;

 	/* add metadata */
 	if(encoder_valid && (metadata_mask & 1)) {
 		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_STREAMINFO)) == NULL)
 			encoder_valid = false;
 		else
 			num_metadata++;
 	}
 	if(encoder_valid && (metadata_mask & 2) && size > 21){
 		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL)
 			encoder_valid = false;
 		else {
 			metadata[num_metadata++]->length = (((unsigned)data[20]) << 8) + (unsigned)(data[21]);
 		}
 	}
 	if(encoder_valid && (metadata_mask & 4) && size > 20){
 		FLAC__byte * application_data = (FLAC__byte *)malloc(size-20);
 		if(0 != application_data && ((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_APPLICATION)) == NULL))
 			encoder_valid = false;
 		else {
 			memcpy(application_data,data+20,size-20);
 			FLAC__metadata_object_application_set_data(metadata[num_metadata++], application_data, size-20, 0);
 		}
 	}
 	if(encoder_valid && (metadata_mask & 8) && size > 25){
 		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE)) == NULL)
 			encoder_valid = false;
 		else {
 			unsigned seekpoint_spacing = ((unsigned)data[22] << 8) + data[23];
 			unsigned total_samples_for_seekpoints = ((unsigned)data[24] << 8) + data[25];
 			FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(metadata[num_metadata++], seekpoint_spacing, total_samples_for_seekpoints);
 		}
 	}
 	if(encoder_valid && (metadata_mask & 16)){
 		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) != NULL) {
 			bool vorbiscomment_valid = true;
 			/* Append a vorbis comment */
 			if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Nothing to 🤔 report"))
 				vorbiscomment_valid = false;
 			else {
 				if(FLAC__metadata_object_vorbiscomment_append_comment(metadata[num_metadata], VorbisCommentField, false)) {

 					/* Insert a vorbis comment at the first index */
 					if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Still nothing to report 🤔🤣"))
 						vorbiscomment_valid = false;
 					else
 						if(!FLAC__metadata_object_vorbiscomment_insert_comment(metadata[num_metadata], 0, VorbisCommentField, false)) {
 							free(VorbisCommentField.entry);
 							vorbiscomment_valid = false;
 						}
 				}
 				else {
 					free(VorbisCommentField.entry);
 					vorbiscomment_valid = false;
 				}
 			}
 			if(!vorbiscomment_valid) {
 				FLAC__metadata_object_delete(metadata[num_metadata]);
 				metadata[num_metadata] = 0;
 			}
 			else
 				num_metadata++;
 		}
 	}
 	if(encoder_valid && (metadata_mask & 32)){
 		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET)) != NULL) {
 			if(!FLAC__metadata_object_cuesheet_insert_blank_track(metadata[num_metadata],0)) {
 				FLAC__metadata_object_delete(metadata[num_metadata]);
 				metadata[num_metadata] = 0;
 			}
 			else {
 				if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(metadata[num_metadata],0,0)) {
 					FLAC__metadata_object_delete(metadata[num_metadata]);
 					metadata[num_metadata] = 0;
 				}
 				else {
 					metadata[num_metadata]->data.cue_sheet.tracks[0].number = 1;
 					num_metadata++;
 				}
 			}
 		}
 	}
 	if(encoder_valid && (metadata_mask & 64)){
 		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PICTURE)) != NULL) {
 			num_metadata++;
 		}
 	}
 	if(encoder_valid && (metadata_mask & 128)){
 		if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_UNDEFINED)) != NULL) {
 			metadata[num_metadata]->length = 24;
 			metadata[num_metadata]->data.unknown.data = (FLAC__byte *)calloc(24, 1);
 			num_metadata++;
 		}
 	}

 	if(num_metadata && encoder_valid)
 			encoder_valid = FLAC__stream_encoder_set_metadata(encoder, metadata, num_metadata);

 	/* initialize encoder */
 	if(encoder_valid) {
 		FLAC__StreamEncoderInitStatus init_status;
 		if(ogg)
 			if(write_to_file)
 				init_status = FLAC__stream_encoder_init_ogg_file(encoder, "/tmp/tmp.flac", NULL, NULL);
 			else
 				init_status = FLAC__stream_encoder_init_ogg_stream(encoder, NULL, write_callback, NULL, NULL, NULL, NULL);
 		else
 			if(write_to_file)
 				init_status = FLAC__stream_encoder_init_file(encoder, "/tmp/tmp.flac", NULL, NULL);
 			else
 				init_status = FLAC__stream_encoder_init_stream(encoder, write_callback, NULL, NULL, NULL, NULL);
 		if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
 			encoder_valid = false;
 		}
 	}


 	/* send samples to encoder */
 	if(encoder_valid && size > (input_data_width*channels+26)) {
 		unsigned samples = (size - 26)/input_data_width/channels;
 		const uint8_t * pcm_data = data + 26;
 		int32_t * data_as_int32 = (int32_t *)malloc(4*samples*channels);
 		if(0 != data_as_int32){
 			for(unsigned i = 0; i < samples*channels; i++)
 				if(input_data_width == 1)
 					data_as_int32[i] = (int32_t)pcm_data[i] - 0x80;
 				else if(input_data_width == 2)
 					data_as_int32[i] = (((int32_t)pcm_data[i*2] << 8) + pcm_data[i*2+1]) - 0x8000;
 				else if(input_data_width == 3)
 					data_as_int32[i] = (((int32_t)pcm_data[i*3] << 16) + ((int32_t)pcm_data[i*3+1] << 8) + pcm_data[i*3+2]) - 0x800000;
 				else if(input_data_width == 4)
 					data_as_int32[i] = (((int64_t)pcm_data[i*4] << 24) + ((int32_t)pcm_data[i*4+1] << 16) + ((int32_t)pcm_data[i*4+2] << 8) + pcm_data[i*4+3]) - 0x80000000;

 			/* feed samples to encoder */
 			if(interleaved)
 				encoder_valid = FLAC__stream_encoder_process_interleaved(encoder, data_as_int32, samples);
 			else {
 				encoder_valid = FLAC__stream_encoder_process(encoder, (const int32_t*[]){data_as_int32,
 				                                                       data_as_int32+samples,
 				                                                       data_as_int32+samples*2,
 				                                                       data_as_int32+samples*3,
 				                                                       data_as_int32+samples*4, data_as_int32+samples*5, data_as_int32+samples*6, data_as_int32+samples*7}, samples);
 			}
 			free(data_as_int32);
 		}
 		else {
 			encoder_valid = false;
 		}
 	}

 	state = FLAC__stream_encoder_get_state(encoder);
 	if(!(state == FLAC__STREAM_ENCODER_OK ||
 	     state == FLAC__STREAM_ENCODER_UNINITIALIZED ||
 	     state == FLAC__STREAM_ENCODER_CLIENT_ERROR ||
 	     ((state == FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR ||
                state == FLAC__STREAM_ENCODER_FRAMING_ERROR ||
 	       (state == FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR &&
 	        FLAC__stream_encoder_get_verify_decoder_state(encoder) == FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR)) &&
 	      alloc_check_threshold < INT32_MAX))) {
 		fprintf(stderr,"-----\nERROR: stream encoder returned %s\n-----\n",FLAC__stream_encoder_get_resolved_state_string(encoder));
 		if(state == FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA) {
 			uint32_t frame_number, channel, sample_number;
 			FLAC__int32 expected, got;
 			FLAC__stream_encoder_get_verify_decoder_error_stats(encoder, NULL, &frame_number, &channel, &sample_number, &expected, &got);
 			fprintf(stderr,"Frame number %d\nChannel %d\n Sample number %d\nExpected value %d\nGot %d\n", frame_number, channel, sample_number, expected, got);
 		}
 		abort();
 	}

 	FLAC__stream_encoder_finish(encoder);

 	/* now that encoding is finished, the metadata can be freed */
 	for(unsigned i = 0; i < 16; i++)
 		if(0 != metadata[i])
 			FLAC__metadata_object_delete(metadata[i]);

 	FLAC__stream_encoder_delete(encoder);

 	return 0;
 }
	/* fuzzer_encoder_v2
	* Copyright (C) 2022-2023 Xiph.Org Foundation
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* - Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* - Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* - Neither the name of the Xiph.org Foundation nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <cstdlib>
	#include <cstring> /* for memcpy */
	#include "FLAC/stream_encoder.h"
	#include "FLAC/metadata.h"
	extern "C" {
	#include "share/private.h"
	}
	#include "common.h"

	/* This C++ fuzzer uses the FLAC and not FLAC++ because the latter lacks a few
	* hidden functions like FLAC__stream_encoder_disable_constant_subframes. It
	* is still processed by a C++ compiler because that's what oss-fuzz expects */


	static FLAC__StreamEncoderWriteStatus write_callback(const FLAC__StreamEncoder encoder, const FLAC__byte buffer[], size_t bytes, uint32_t samples, uint32_t current_frame, void client_data)
	{
	(void)encoder, (void)buffer, (void)bytes, (void)samples, (void)current_frame, (void)client_data;
	return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
	}

	extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
	{
	FLAC__bool encoder_valid = true;
	FLAC__StreamEncoder *encoder = 0;
	FLAC__StreamEncoderState state;
	FLAC__StreamMetadata *metadata[16] = {NULL};
	unsigned num_metadata = 0;
	FLAC__StreamMetadata_VorbisComment_Entry VorbisCommentField;

	unsigned sample_rate, channels, bps;
	uint64_t samples_estimate, samples_in_input;
	unsigned compression_level, input_data_width, blocksize, max_lpc_order, qlp_coeff_precision, min_residual_partition_order, max_residual_partition_order, metadata_mask, instruction_set_disable_mask;
	FLAC__bool ogg, write_to_file, interleaved;

	FLAC__bool data_bools[24];

	/* Set alloc threshold. This check was added later and no spare config
	* bytes were left, so we're reusing the sample rate as that of little
	* consequence to the encoder and decoder except reading the frame header */

	if(size < 3)
	return 0;
	alloc_check_threshold = data[2];
	alloc_check_counter = 0;

	/* allocate the encoder */
	if((encoder = FLAC__stream_encoder_new()) == NULL) {
	fprintf(stderr, "ERROR: allocating encoder\n");
	return 1;
	}

	/* Use first 20 byte for configuration */
	if(size < 20){
	FLAC__stream_encoder_delete(encoder);
	return 0;
	}

	/* First 3 byte for sample rate, 4th byte for channels, 5th byte for bps */
	sample_rate = ((unsigned)data[0] << 16) + ((unsigned)data[1] << 8) + data[2];
	channels = data[3];
	bps = data[4];

	/* Number of samples estimate, format accepts 36-bit max */
	samples_estimate = ((uint64_t)data[5] << 32) + ((unsigned)data[6] << 24) + ((unsigned)data[7] << 16) + ((unsigned)data[8] << 8) + data[9];

	compression_level = data[10]&0b1111;
	input_data_width = 1 + (data[10]>>4)%4;
	samples_in_input = (size-20)/input_data_width;
	blocksize = ((unsigned)data[11] << 8) + (unsigned)data[12];
	max_lpc_order = data[13];
	qlp_coeff_precision = data[14];
	min_residual_partition_order = data[15] & 0b1111;
	max_residual_partition_order = data[15] & 0b11110000;
	metadata_mask = data[16];
	instruction_set_disable_mask = data[17];

	/* Get array of bools from configuration */
	for(int i = 0; i < 16; i++)
	data_bools[i] = data[18+i/8] & (1 << (i % 8));

	ogg = data_bools[0];
	interleaved = data_bools[1];
	write_to_file = data_bools[13];

	/* Set input and process parameters */
	encoder_valid &= FLAC__stream_encoder_set_verify(encoder, data_bools[2]);
	encoder_valid &= FLAC__stream_encoder_set_channels(encoder, channels);
	encoder_valid &= FLAC__stream_encoder_set_bits_per_sample(encoder, bps);
	encoder_valid &= FLAC__stream_encoder_set_sample_rate(encoder, sample_rate);
	encoder_valid &= FLAC__stream_encoder_set_total_samples_estimate(encoder, samples_estimate);
	encoder_valid &= FLAC__stream_encoder_disable_instruction_set(encoder, instruction_set_disable_mask);
	encoder_valid &= FLAC__stream_encoder_set_limit_min_bitrate(encoder, data_bools[15]);

	/* Set compression related parameters */
	encoder_valid &= FLAC__stream_encoder_set_compression_level(encoder, compression_level);
	if(data_bools[3]){
	/* Bias towards regular compression levels */
	encoder_valid &= FLAC__stream_encoder_set_blocksize(encoder, blocksize);
	encoder_valid &= FLAC__stream_encoder_set_max_lpc_order(encoder, max_lpc_order);
	encoder_valid &= FLAC__stream_encoder_set_qlp_coeff_precision(encoder, qlp_coeff_precision);
	encoder_valid &= FLAC__stream_encoder_set_min_residual_partition_order(encoder, min_residual_partition_order);

	/* With large inputs and expensive options enabled, the fuzzer can get really slow.
	* Some combinations can make the fuzzer timeout (>60 seconds). However, while combining
	* options makes the fuzzer slower, most options do not expose new code when combined.
	* Therefore, combining slow options is disabled for large inputs. Any input containing
	* more than 65536 * 2 samples (max blocksize, stereo) is considered large
	*/
	if(samples_in_input < (2*65536)) {
	encoder_valid &= FLAC__stream_encoder_set_streamable_subset(encoder, data_bools[4]);
	encoder_valid &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search(encoder, data_bools[5]);
	encoder_valid &= FLAC__stream_encoder_set_do_escape_coding(encoder, data_bools[6]);
	encoder_valid &= FLAC__stream_encoder_set_do_exhaustive_model_search(encoder, data_bools[7]);
	/* Combining model search, precision search and a high residual partition order is especially
	* expensive, so limit that even further. This high partition order can only be set on
	* large blocksize and with streamable subset disabled */
	if(samples_in_input < (2 * 4609) \|\| data_bools[4] \|\| !data_bools[7] \|\| !data_bools[5] \|\| max_residual_partition_order < 9 \|\| blocksize < 4609)
	encoder_valid &= FLAC__stream_encoder_set_max_residual_partition_order(encoder, max_residual_partition_order);
	}
	else {
	if(!data_bools[4])
	encoder_valid &= FLAC__stream_encoder_set_streamable_subset(encoder, false);
	else if(data_bools[6])
	encoder_valid &= FLAC__stream_encoder_set_do_escape_coding(encoder, true);
	else if(data_bools[7])
	encoder_valid &= FLAC__stream_encoder_set_do_exhaustive_model_search(encoder, true);
	else if(data_bools[5])
	encoder_valid &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search(encoder, true);
	}
	encoder_valid &= FLAC__stream_encoder_set_do_mid_side_stereo(encoder, data_bools[8]);
	encoder_valid &= FLAC__stream_encoder_set_loose_mid_side_stereo(encoder, data_bools[9]);

	encoder_valid &= FLAC__stream_encoder_disable_constant_subframes(encoder, data_bools[10]);
	encoder_valid &= FLAC__stream_encoder_disable_fixed_subframes(encoder, data_bools[11]);
	encoder_valid &= FLAC__stream_encoder_disable_verbatim_subframes(encoder, data_bools[12]);
	}

	/* Disable alloc check if requested */
	if(encoder_valid && data_bools[14])
	alloc_check_threshold = INT32_MAX;

	/* add metadata */
	if(encoder_valid && (metadata_mask & 1)) {
	if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_STREAMINFO)) == NULL)
	encoder_valid = false;
	else
	num_metadata++;
	}
	if(encoder_valid && (metadata_mask & 2) && size > 21){
	if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL)
	encoder_valid = false;
	else {
	metadata[num_metadata++]->length = (((unsigned)data[20]) << 8) + (unsigned)(data[21]);
	}
	}
	if(encoder_valid && (metadata_mask & 4) && size > 20){
	FLAC__byte * application_data = (FLAC__byte *)malloc(size-20);
	if(0 != application_data && ((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_APPLICATION)) == NULL))
	encoder_valid = false;
	else {
	memcpy(application_data,data+20,size-20);
	FLAC__metadata_object_application_set_data(metadata[num_metadata++], application_data, size-20, 0);
	}
	}
	if(encoder_valid && (metadata_mask & 8) && size > 25){
	if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE)) == NULL)
	encoder_valid = false;
	else {
	unsigned seekpoint_spacing = ((unsigned)data[22] << 8) + data[23];
	unsigned total_samples_for_seekpoints = ((unsigned)data[24] << 8) + data[25];
	FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(metadata[num_metadata++], seekpoint_spacing, total_samples_for_seekpoints);
	}
	}
	if(encoder_valid && (metadata_mask & 16)){
	if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) != NULL) {
	bool vorbiscomment_valid = true;
	/* Append a vorbis comment */
	if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Nothing to 🤔 report"))
	vorbiscomment_valid = false;
	else {
	if(FLAC__metadata_object_vorbiscomment_append_comment(metadata[num_metadata], VorbisCommentField, false)) {

	/* Insert a vorbis comment at the first index */
	if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Still nothing to report 🤔🤣"))
	vorbiscomment_valid = false;
	else
	if(!FLAC__metadata_object_vorbiscomment_insert_comment(metadata[num_metadata], 0, VorbisCommentField, false)) {
	free(VorbisCommentField.entry);
	vorbiscomment_valid = false;
	}
	}
	else {
	free(VorbisCommentField.entry);
	vorbiscomment_valid = false;
	}
	}
	if(!vorbiscomment_valid) {
	FLAC__metadata_object_delete(metadata[num_metadata]);
	metadata[num_metadata] = 0;
	}
	else
	num_metadata++;
	}
	}
	if(encoder_valid && (metadata_mask & 32)){
	if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET)) != NULL) {
	if(!FLAC__metadata_object_cuesheet_insert_blank_track(metadata[num_metadata],0)) {
	FLAC__metadata_object_delete(metadata[num_metadata]);
	metadata[num_metadata] = 0;
	}
	else {
	if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(metadata[num_metadata],0,0)) {
	FLAC__metadata_object_delete(metadata[num_metadata]);
	metadata[num_metadata] = 0;
	}
	else {
	metadata[num_metadata]->data.cue_sheet.tracks[0].number = 1;
	num_metadata++;
	}
	}
	}
	}
	if(encoder_valid && (metadata_mask & 64)){
	if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PICTURE)) != NULL) {
	num_metadata++;
	}
	}
	if(encoder_valid && (metadata_mask & 128)){
	if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_UNDEFINED)) != NULL) {
	metadata[num_metadata]->length = 24;
	metadata[num_metadata]->data.unknown.data = (FLAC__byte *)calloc(24, 1);
	num_metadata++;
	}
	}

	if(num_metadata && encoder_valid)
	encoder_valid = FLAC__stream_encoder_set_metadata(encoder, metadata, num_metadata);

	/* initialize encoder */
	if(encoder_valid) {
	FLAC__StreamEncoderInitStatus init_status;
	if(ogg)
	if(write_to_file)
	init_status = FLAC__stream_encoder_init_ogg_file(encoder, "/tmp/tmp.flac", NULL, NULL);
	else
	init_status = FLAC__stream_encoder_init_ogg_stream(encoder, NULL, write_callback, NULL, NULL, NULL, NULL);
	else
	if(write_to_file)
	init_status = FLAC__stream_encoder_init_file(encoder, "/tmp/tmp.flac", NULL, NULL);
	else
	init_status = FLAC__stream_encoder_init_stream(encoder, write_callback, NULL, NULL, NULL, NULL);
	if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
	encoder_valid = false;
	}
	}


	/* send samples to encoder */
	if(encoder_valid && size > (input_data_width*channels+26)) {
	unsigned samples = (size - 26)/input_data_width/channels;
	const uint8_t * pcm_data = data + 26;
	int32_t * data_as_int32 = (int32_t )malloc(4samples*channels);
	if(0 != data_as_int32){
	for(unsigned i = 0; i < samples*channels; i++)
	if(input_data_width == 1)
	data_as_int32[i] = (int32_t)pcm_data[i] - 0x80;
	else if(input_data_width == 2)
	data_as_int32[i] = (((int32_t)pcm_data[i2] << 8) + pcm_data[i2+1]) - 0x8000;
	else if(input_data_width == 3)
	data_as_int32[i] = (((int32_t)pcm_data[i3] << 16) + ((int32_t)pcm_data[i3+1] << 8) + pcm_data[i*3+2]) - 0x800000;
	else if(input_data_width == 4)
	data_as_int32[i] = (((int64_t)pcm_data[i4] << 24) + ((int32_t)pcm_data[i4+1] << 16) + ((int32_t)pcm_data[i4+2] << 8) + pcm_data[i4+3]) - 0x80000000;

	/* feed samples to encoder */
	if(interleaved)
	encoder_valid = FLAC__stream_encoder_process_interleaved(encoder, data_as_int32, samples);
	else {
	encoder_valid = FLAC__stream_encoder_process(encoder, (const int32_t*[]){data_as_int32,
	data_as_int32+samples,
	data_as_int32+samples*2,
	data_as_int32+samples*3,
	data_as_int32+samples4, data_as_int32+samples5, data_as_int32+samples6, data_as_int32+samples7}, samples);
	}
	free(data_as_int32);
	}
	else {
	encoder_valid = false;
	}
	}

	state = FLAC__stream_encoder_get_state(encoder);
	if(!(state == FLAC__STREAM_ENCODER_OK \|\|
	state == FLAC__STREAM_ENCODER_UNINITIALIZED \|\|
	state == FLAC__STREAM_ENCODER_CLIENT_ERROR \|\|
	((state == FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR \|\|
	state == FLAC__STREAM_ENCODER_FRAMING_ERROR \|\|
	(state == FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR &&
	FLAC__stream_encoder_get_verify_decoder_state(encoder) == FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR)) &&
	alloc_check_threshold < INT32_MAX))) {
	fprintf(stderr,"-----\nERROR: stream encoder returned %s\n-----\n",FLAC__stream_encoder_get_resolved_state_string(encoder));
	if(state == FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA) {
	uint32_t frame_number, channel, sample_number;
	FLAC__int32 expected, got;
	FLAC__stream_encoder_get_verify_decoder_error_stats(encoder, NULL, &frame_number, &channel, &sample_number, &expected, &got);
	fprintf(stderr,"Frame number %d\nChannel %d\n Sample number %d\nExpected value %d\nGot %d\n", frame_number, channel, sample_number, expected, got);
	}
	abort();
	}

	FLAC__stream_encoder_finish(encoder);

	/* now that encoding is finished, the metadata can be freed */
	for(unsigned i = 0; i < 16; i++)
	if(0 != metadata[i])
	FLAC__metadata_object_delete(metadata[i]);

	FLAC__stream_encoder_delete(encoder);

	return 0;
	}