stream_encoder.c

这是著名的TCPMP播放器在WINDWOWS,和WINCE下编译通过的源程序.笔者对其中的LIBMAD库做了针对ARM MPU的优化. 并增加了词幕功能.

			else if(encoder->protected_->blocksize <= 4608)
				encoder->protected_->qlp_coeff_precision = 12;
			else
				encoder->protected_->qlp_coeff_precision = 13;
		}
		else {
			if(encoder->protected_->blocksize <= 384)
				encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-2;
			else if(encoder->protected_->blocksize <= 1152)
				encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION-1;
			else
				encoder->protected_->qlp_coeff_precision = FLAC__MAX_QLP_COEFF_PRECISION;
		}
		FLAC__ASSERT(encoder->protected_->qlp_coeff_precision <= FLAC__MAX_QLP_COEFF_PRECISION);
	}
	else if(encoder->protected_->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected_->qlp_coeff_precision > FLAC__MAX_QLP_COEFF_PRECISION)
		return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION;

	if(encoder->protected_->streamable_subset) {
		if(
			encoder->protected_->blocksize != 192 &&
			encoder->protected_->blocksize != 576 &&
			encoder->protected_->blocksize != 1152 &&
			encoder->protected_->blocksize != 2304 &&
			encoder->protected_->blocksize != 4608 &&
			encoder->protected_->blocksize != 256 &&
			encoder->protected_->blocksize != 512 &&
			encoder->protected_->blocksize != 1024 &&
			encoder->protected_->blocksize != 2048 &&
			encoder->protected_->blocksize != 4096 &&
			encoder->protected_->blocksize != 8192 &&
			encoder->protected_->blocksize != 16384
		)
			return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
		if(
			encoder->protected_->sample_rate != 8000 &&
			encoder->protected_->sample_rate != 16000 &&
			encoder->protected_->sample_rate != 22050 &&
			encoder->protected_->sample_rate != 24000 &&
			encoder->protected_->sample_rate != 32000 &&
			encoder->protected_->sample_rate != 44100 &&
			encoder->protected_->sample_rate != 48000 &&
			encoder->protected_->sample_rate != 96000
		)
			return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
		if(
			encoder->protected_->bits_per_sample != 8 &&
			encoder->protected_->bits_per_sample != 12 &&
			encoder->protected_->bits_per_sample != 16 &&
			encoder->protected_->bits_per_sample != 20 &&
			encoder->protected_->bits_per_sample != 24
		)
			return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
		if(encoder->protected_->max_residual_partition_order > FLAC__SUBSET_MAX_RICE_PARTITION_ORDER)
			return encoder->protected_->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE;
	}

	if(encoder->protected_->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
		encoder->protected_->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1;
	if(encoder->protected_->min_residual_partition_order >= encoder->protected_->max_residual_partition_order)
		encoder->protected_->min_residual_partition_order = encoder->protected_->max_residual_partition_order;

	/* validate metadata */
	if(0 == encoder->protected_->metadata && encoder->protected_->num_metadata_blocks > 0)
		return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
	metadata_has_seektable = false;
	metadata_has_vorbis_comment = false;
	for(i = 0; i < encoder->protected_->num_metadata_blocks; i++) {
		if(encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_STREAMINFO)
			return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
		else if(encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_SEEKTABLE) {
			if(metadata_has_seektable) /* only one is allowed */
				return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
			metadata_has_seektable = true;
			if(!FLAC__format_seektable_is_legal(&encoder->protected_->metadata[i]->data.seek_table))
				return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
		}
		else if(encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
			if(metadata_has_vorbis_comment) /* only one is allowed */
				return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
			metadata_has_vorbis_comment = true;
		}
		else if(encoder->protected_->metadata[i]->type == FLAC__METADATA_TYPE_CUESHEET) {
			if(!FLAC__format_cuesheet_is_legal(&encoder->protected_->metadata[i]->data.cue_sheet, encoder->protected_->metadata[i]->data.cue_sheet.is_cd, /*violation=*/0))
				return encoder->protected_->state = FLAC__STREAM_ENCODER_INVALID_METADATA;
		}
	}

	encoder->private_->input_capacity = 0;
	for(i = 0; i < encoder->protected_->channels; i++) {
		encoder->private_->integer_signal_unaligned[i] = encoder->private_->integer_signal[i] = 0;
#ifndef FLAC__INTEGER_ONLY_LIBRARY
		encoder->private_->real_signal_unaligned[i] = encoder->private_->real_signal[i] = 0;
#endif
	}
	for(i = 0; i < 2; i++) {
		encoder->private_->integer_signal_mid_side_unaligned[i] = encoder->private_->integer_signal_mid_side[i] = 0;
#ifndef FLAC__INTEGER_ONLY_LIBRARY
		encoder->private_->real_signal_mid_side_unaligned[i] = encoder->private_->real_signal_mid_side[i] = 0;
#endif
	}
	for(i = 0; i < encoder->protected_->channels; i++) {
		encoder->private_->residual_workspace_unaligned[i][0] = encoder->private_->residual_workspace[i][0] = 0;
		encoder->private_->residual_workspace_unaligned[i][1] = encoder->private_->residual_workspace[i][1] = 0;
		encoder->private_->best_subframe[i] = 0;
	}
	for(i = 0; i < 2; i++) {
		encoder->private_->residual_workspace_mid_side_unaligned[i][0] = encoder->private_->residual_workspace_mid_side[i][0] = 0;
		encoder->private_->residual_workspace_mid_side_unaligned[i][1] = encoder->private_->residual_workspace_mid_side[i][1] = 0;
		encoder->private_->best_subframe_mid_side[i] = 0;
	}
	encoder->private_->abs_residual_unaligned = encoder->private_->abs_residual = 0;
	encoder->private_->abs_residual_partition_sums_unaligned = encoder->private_->abs_residual_partition_sums = 0;
	encoder->private_->raw_bits_per_partition_unaligned = encoder->private_->raw_bits_per_partition = 0;
#ifndef FLAC__INTEGER_ONLY_LIBRARY
	encoder->private_->loose_mid_side_stereo_frames = (unsigned)((FLAC__double)encoder->protected_->sample_rate * 0.4 / (FLAC__double)encoder->protected_->blocksize + 0.5);
#else
	/* 26214 is the approximate fixed-point equivalent to 0.4 (0.4 * 2^16) */
	/* sample rate can be up to 655350 Hz, and thus use 20 bits, so we do the multiply&divide by hand */
	FLAC__ASSERT(FLAC__MAX_SAMPLE_RATE <= 655350);
	FLAC__ASSERT(FLAC__MAX_BLOCK_SIZE <= 65535);
	FLAC__ASSERT(encoder->protected_->sample_rate <= 655350);
	FLAC__ASSERT(encoder->protected_->blocksize <= 65535);
	encoder->private_->loose_mid_side_stereo_frames = (unsigned)FLAC__fixedpoint_trunc((((FLAC__uint64)(encoder->protected_->sample_rate) * (FLAC__uint64)(26214)) << 16) / (encoder->protected_->blocksize<<16) + FLAC__FP_ONE_HALF);
#endif
	if(encoder->private_->loose_mid_side_stereo_frames == 0)
		encoder->private_->loose_mid_side_stereo_frames = 1;
	encoder->private_->loose_mid_side_stereo_frame_count = 0;
	encoder->private_->current_sample_number = 0;
	encoder->private_->current_frame_number = 0;

	encoder->private_->use_wide_by_block = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected_->blocksize)+1 > 30);
	encoder->private_->use_wide_by_order = (encoder->protected_->bits_per_sample + FLAC__bitmath_ilog2(max(encoder->protected_->max_lpc_order, FLAC__MAX_FIXED_ORDER))+1 > 30); /*@@@ need to use this? */
	encoder->private_->use_wide_by_partition = (false); /*@@@ need to set this */

	/*
	 * get the CPU info and set the function pointers
	 */
	FLAC__cpu_info(&encoder->private_->cpuinfo);
	/* first default to the non-asm routines */
#ifndef FLAC__INTEGER_ONLY_LIBRARY
	encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation;
#endif
	encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor;
#ifndef FLAC__INTEGER_ONLY_LIBRARY
	encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients;
	encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_64bit = FLAC__lpc_compute_residual_from_qlp_coefficients_wide;
	encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients;
#endif
	/* now override with asm where appropriate */
#ifndef FLAC__INTEGER_ONLY_LIBRARY
# ifndef FLAC__NO_ASM
	if(encoder->private_->cpuinfo.use_asm) {
#  ifdef FLAC__CPU_IA32
		FLAC__ASSERT(encoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
#   ifdef FLAC__HAS_NASM
#    ifdef FLAC__SSE_OS
		if(encoder->private_->cpuinfo.data.ia32.sse) {
			if(encoder->protected_->max_lpc_order < 4)
				encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_4;
			else if(encoder->protected_->max_lpc_order < 8)
				encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_8;
			else if(encoder->protected_->max_lpc_order < 12)
				encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_sse_lag_12;
			else
				encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
		}
		else
#    endif /* FLAC__SSE_OS */
		if(encoder->private_->cpuinfo.data.ia32._3dnow)
			encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32_3dnow;
		else
			encoder->private_->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_ia32;
		if(encoder->private_->cpuinfo.data.ia32.mmx) {
			encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
			encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32_mmx;
		}
		else {
			encoder->private_->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
			encoder->private_->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_ia32;
		}
		if(encoder->private_->cpuinfo.data.ia32.mmx && encoder->private_->cpuinfo.data.ia32.cmov)
			encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_ia32_mmx_cmov;
#   endif /* FLAC__HAS_NASM */
#  endif /* FLAC__CPU_IA32 */
	}
# endif /* !FLAC__NO_ASM */
#endif /* !FLAC__INTEGER_ONLY_LIBRARY */
	/* finally override based on wide-ness if necessary */
	if(encoder->private_->use_wide_by_block) {
		encoder->private_->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_wide;
	}

	/* we require precompute_partition_sums if do_escape_coding because of their intertwined nature */
	encoder->private_->precompute_partition_sums = (encoder->protected_->max_residual_partition_order > encoder->protected_->min_residual_partition_order) || encoder->protected_->do_escape_coding;

	if(!resize_buffers_(encoder, encoder->protected_->blocksize)) {
		/* the above function sets the state for us in case of an error */
		return encoder->protected_->state;
	}

	if(!FLAC__bitbuffer_init(encoder->private_->frame))
		return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;

	/*
	 * Set up the verify stuff if necessary
	 */
	if(encoder->protected_->verify) {
		/*
		 * First, set up the fifo which will hold the
		 * original signal to compare against
		 */
		encoder->private_->verify.input_fifo.size = encoder->protected_->blocksize;
		for(i = 0; i < encoder->protected_->channels; i++) {
			if(0 == (encoder->private_->verify.input_fifo.data[i] = (FLAC__int32*)malloc(sizeof(FLAC__int32) * encoder->private_->verify.input_fifo.size)))
				return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
		}
		encoder->private_->verify.input_fifo.tail = 0;

		/*
		 * Now set up a stream decoder for verification
		 */
		encoder->private_->verify.decoder = FLAC__stream_decoder_new();
		if(0 == encoder->private_->verify.decoder)
			return encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;

		FLAC__stream_decoder_set_read_callback(encoder->private_->verify.decoder, verify_read_callback_);
		FLAC__stream_decoder_set_write_callback(encoder->private_->verify.decoder, verify_write_callback_);
		FLAC__stream_decoder_set_metadata_callback(encoder->private_->verify.decoder, verify_metadata_callback_);
		FLAC__stream_decoder_set_error_callback(encoder->private_->verify.decoder, verify_error_callback_);
		FLAC__stream_decoder_set_client_data(encoder->private_->verify.decoder, encoder);
		if(FLAC__stream_decoder_init(encoder->private_->verify.decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
			return encoder->protected_->state = FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR;
	}
	encoder->private_->verify.error_stats.absolute_sample = 0;
	encoder->private_->verify.error_stats.frame_number = 0;
	encoder->private_->verify.error_stats.channel = 0;
	encoder->private_->verify.error_stats.sample = 0;
	encoder->private_->verify.error_stats.expected = 0;
	encoder->private_->verify.error_stats.got = 0;

	/*
	 * write the stream header
	 */
	if(encoder->protected_->verify)
		encoder->private_->verify.state_hint = ENCODER_IN_MAGIC;
	if(!FLAC__bitbuffer_write_raw_uint32(encoder->private_->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN))
		return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
	if(!write_bitbuffer_(encoder, 0)) {
		/* the above function sets the state for us in case of an error */
		return encoder->protected_->state;
	}

	/*
	 * write the STREAMINFO metadata block
	 */
	if(encoder->protected_->verify)
		encoder->private_->verify.state_hint = ENCODER_IN_METADATA;
	encoder->private_->metadata.type = FLAC__METADATA_TYPE_STREAMINFO;
	encoder->private_->metadata.is_last = false; /* we will have at a minimum a VORBIS_COMMENT afterwards */
	encoder->private_->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
	encoder->private_->metadata.data.stream_info.min_blocksize = encoder->protected_->blocksize; /* this encoder uses the same blocksize for the whole stream */
	encoder->private_->metadata.data.stream_info.max_blocksize = encoder->protected_->blocksize;
	encoder->private_->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */
	encoder->private_->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */
	encoder->private_->metadata.data.stream_info.sample_rate = encoder->protected_->sample_rate;
	encoder->private_->metadata.data.stream_info.channels = encoder->protected_->channels;
	encoder->private_->metadata.data.stream_info.bits_per_sample = encoder->protected_->bits_per_sample;
	encoder->private_->metadata.data.stream_info.total_samples = encoder->protected_->total_samples_estimate; /* we will replace this later with the real total */
	memset(encoder->private_->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */
	FLAC__MD5Init(&encoder->private_->md5context);
	if(!FLAC__bitbuffer_clear(encoder->private_->frame))
		return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
	if(!FLAC__add_metadata_block(&encoder->private_->metadata, encoder->private_->frame))
		return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
	if(!write_bitbuffer_(encoder, 0)) {
		/* the above function sets the state for us in case of an error */
		return encoder->protected_->state;
	}

	/*
	 * Now that the STREAMINFO block is written, we can init this to an
	 * absurdly-high value...
	 */
	encoder->private_->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1;
	/* ... and clear this to 0 */
	encoder->private_->metadata.data.stream_info.total_samples = 0;

	/*
	 * Check to see if the supplied metadata contains a VORBIS_COMMENT;
	 * if not, we will write an empty one (FLAC__add_metadata_block()
	 * automatically supplies the vendor string).
	 *
	 * WATCHOUT: libOggFLAC depends on us to write this block after the
	 * STREAMINFO since that's what the mapping requires.  (In the case
	 * that metadata_has_vorbis_comment is true it will have already
	 * insured that the metadata list is properly ordered.)
	 */
	if(!metadata_has_vorbis_comment) {
		FLAC__StreamMetadata vorbis_comment;
		vorbis_comment.type = FLAC__METADATA_TYPE_VORBIS_COMMENT;
		vorbis_comment.is_last = (encoder->protected_->num_metadata_blocks == 0);
		vorbis_comment.length = 4 + 4; /* MAGIC NUMBER */
		vorbis_comment.data.vorbis_comment.vendor_string.length = 0;
		vorbis_comment.data.vorbis_comment.vendor_string.entry = 0;
		vorbis_comment.data.vorbis_comment.num_comments = 0;
		vorbis_comment.data.vorbis_comment.comments = 0;
		if(!FLAC__bitbuffer_clear(encoder->private_->frame))
			return encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
		if(!FLAC__add_metadata_block(&vorbis_comment, encoder->private_->frame))
			return encoder->protected_->state = FLAC__STREAM_ENCODER_FRAMING_ERROR;
		if(!write_bitbuffer_(encoder, 0)) {