--- /dev/null
+/* license:BSD-3-Clause
+ * copyright-holders:Aaron Giles
+***************************************************************************
+
+ flac.c
+
+ FLAC compression wrappers
+
+***************************************************************************/
+
+#include <assert.h>
+#include <string.h>
+#include <libchdr/flac.h>
+#include <libchdr/minmax.h>
+#include <retro_miscellaneous.h>
+
+/***************************************************************************
+ * FLAC DECODER
+ ***************************************************************************
+ */
+
+static FLAC__StreamDecoderReadStatus flac_decoder_read_callback_static(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
+FLAC__StreamDecoderReadStatus flac_decoder_read_callback(void* client_data, FLAC__byte buffer[], size_t *bytes);
+static void flac_decoder_metadata_callback_static(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
+static FLAC__StreamDecoderTellStatus flac_decoder_tell_callback_static(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
+static FLAC__StreamDecoderWriteStatus flac_decoder_write_callback_static(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
+FLAC__StreamDecoderWriteStatus flac_decoder_write_callback(void* client_data, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
+static void flac_decoder_error_callback_static(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
+
+/*-------------------------------------------------
+ * flac_decoder - constructor
+ *-------------------------------------------------
+ */
+
+void flac_decoder_init(flac_decoder *decoder)
+{
+ decoder->decoder = FLAC__stream_decoder_new();
+ decoder->sample_rate = 0;
+ decoder->channels = 0;
+ decoder->bits_per_sample = 0;
+ decoder->compressed_offset = 0;
+ decoder->compressed_start = NULL;
+ decoder->compressed_length = 0;
+ decoder->compressed2_start = NULL;
+ decoder->compressed2_length = 0;
+ decoder->uncompressed_offset = 0;
+ decoder->uncompressed_length = 0;
+ decoder->uncompressed_swap = 0;
+}
+
+/*-------------------------------------------------
+ * flac_decoder - destructor
+ *-------------------------------------------------
+ */
+
+void flac_decoder_free(flac_decoder* decoder)
+{
+ if ((decoder != NULL) && (decoder->decoder != NULL))
+ FLAC__stream_decoder_delete(decoder->decoder);
+}
+
+/*-------------------------------------------------
+ * reset - reset state with the original
+ * parameters
+ *-------------------------------------------------
+ */
+
+static int flac_decoder_internal_reset(flac_decoder* decoder)
+{
+ decoder->compressed_offset = 0;
+ if (FLAC__stream_decoder_init_stream(decoder->decoder,
+ &flac_decoder_read_callback_static,
+ NULL,
+ &flac_decoder_tell_callback_static,
+ NULL,
+ NULL,
+ &flac_decoder_write_callback_static,
+ &flac_decoder_metadata_callback_static,
+ &flac_decoder_error_callback_static, decoder) != FLAC__STREAM_DECODER_INIT_STATUS_OK)
+ return 0;
+ return FLAC__stream_decoder_process_until_end_of_metadata(decoder->decoder);
+}
+
+/*-------------------------------------------------
+ * reset - reset state with new memory parameters
+ * and a custom-generated header
+ *-------------------------------------------------
+ */
+
+int flac_decoder_reset(flac_decoder* decoder, uint32_t sample_rate, uint8_t num_channels, uint32_t block_size, const void *buffer, uint32_t length)
+{
+ /* modify the template header with our parameters */
+ static const uint8_t s_header_template[0x2a] =
+ {
+ 0x66, 0x4C, 0x61, 0x43, /* +00: 'fLaC' stream header */
+ 0x80, /* +04: metadata block type 0 (STREAMINFO), */
+ /* flagged as last block */
+ 0x00, 0x00, 0x22, /* +05: metadata block length = 0x22 */
+ 0x00, 0x00, /* +08: minimum block size */
+ 0x00, 0x00, /* +0A: maximum block size */
+ 0x00, 0x00, 0x00, /* +0C: minimum frame size (0 == unknown) */
+ 0x00, 0x00, 0x00, /* +0F: maximum frame size (0 == unknown) */
+ 0x0A, 0xC4, 0x42, 0xF0, 0x00, 0x00, 0x00, 0x00, /* +12: sample rate (0x0ac44 == 44100), */
+ /* numchannels (2), sample bits (16), */
+ /* samples in stream (0 == unknown) */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* +1A: MD5 signature (0 == none) */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* +2A: start of stream data */
+ };
+ memcpy(decoder->custom_header, s_header_template, sizeof(s_header_template));
+ decoder->custom_header[0x08] = decoder->custom_header[0x0a] = block_size >> 8;
+ decoder->custom_header[0x09] = decoder->custom_header[0x0b] = block_size & 0xff;
+ decoder->custom_header[0x12] = sample_rate >> 12;
+ decoder->custom_header[0x13] = sample_rate >> 4;
+ decoder->custom_header[0x14] = (sample_rate << 4) | ((num_channels - 1) << 1);
+
+ /* configure the header ahead of the provided buffer */
+ decoder->compressed_start = (const FLAC__byte *)(decoder->custom_header);
+ decoder->compressed_length = sizeof(decoder->custom_header);
+ decoder->compressed2_start = (const FLAC__byte *)(buffer);
+ decoder->compressed2_length = length;
+ return flac_decoder_internal_reset(decoder);
+}
+
+/*-------------------------------------------------
+ * decode_interleaved - decode to an interleaved
+ * sound stream
+ *-------------------------------------------------
+ */
+
+int flac_decoder_decode_interleaved(flac_decoder* decoder, int16_t *samples, uint32_t num_samples, int swap_endian)
+{
+ /* configure the uncompressed buffer */
+ memset(decoder->uncompressed_start, 0, sizeof(decoder->uncompressed_start));
+ decoder->uncompressed_start[0] = samples;
+ decoder->uncompressed_offset = 0;
+ decoder->uncompressed_length = num_samples;
+ decoder->uncompressed_swap = swap_endian;
+
+ /* loop until we get everything we want */
+ while (decoder->uncompressed_offset < decoder->uncompressed_length)
+ if (!FLAC__stream_decoder_process_single(decoder->decoder))
+ return 0;
+ return 1;
+}
+
+#if 0
+/*-------------------------------------------------
+ * decode - decode to an multiple independent
+ * data streams
+ *-------------------------------------------------
+ */
+
+bool flac_decoder::decode(int16_t **samples, uint32_t num_samples, bool swap_endian)
+{
+ /* make sure we don't have too many channels */
+ int chans = channels();
+ if (chans > ARRAY_SIZE(m_uncompressed_start))
+ return false;
+
+ /* configure the uncompressed buffer */
+ memset(m_uncompressed_start, 0, sizeof(m_uncompressed_start));
+ for (int curchan = 0; curchan < chans; curchan++)
+ m_uncompressed_start[curchan] = samples[curchan];
+ m_uncompressed_offset = 0;
+ m_uncompressed_length = num_samples;
+ m_uncompressed_swap = swap_endian;
+
+ /* loop until we get everything we want */
+ while (m_uncompressed_offset < m_uncompressed_length)
+ if (!FLAC__stream_decoder_process_single(m_decoder))
+ return false;
+ return true;
+}
+#endif
+
+/*-------------------------------------------------
+ * finish - finish up the decode
+ *-------------------------------------------------
+ */
+
+uint32_t flac_decoder_finish(flac_decoder* decoder)
+{
+ /* get the final decoding position and move forward */
+ FLAC__uint64 position = 0;
+ FLAC__stream_decoder_get_decode_position(decoder->decoder, &position);
+ FLAC__stream_decoder_finish(decoder->decoder);
+
+ /* adjust position if we provided the header */
+ if (position == 0)
+ return 0;
+ if (decoder->compressed_start == (const FLAC__byte *)(decoder->custom_header))
+ position -= decoder->compressed_length;
+ return (uint32_t)position;
+}
+
+/*-------------------------------------------------
+ * read_callback - handle reads from the input
+ * stream
+ *-------------------------------------------------
+ */
+
+FLAC__StreamDecoderReadStatus flac_decoder_read_callback_static(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
+{
+ return flac_decoder_read_callback(client_data, buffer, bytes);
+}
+
+FLAC__StreamDecoderReadStatus flac_decoder_read_callback(void* client_data, FLAC__byte buffer[], size_t *bytes)
+{
+ flac_decoder* decoder = (flac_decoder*)client_data;
+
+ uint32_t expected = (uint32_t)*bytes;
+
+ /* copy from primary buffer first */
+ uint32_t outputpos = 0;
+
+ if (outputpos < *bytes && decoder->compressed_offset < decoder->compressed_length)
+ {
+ uint32_t bytes_to_copy = (uint32_t)MIN(*bytes - outputpos, decoder->compressed_length - decoder->compressed_offset);
+ memcpy(&buffer[outputpos], decoder->compressed_start + decoder->compressed_offset, bytes_to_copy);
+ outputpos += bytes_to_copy;
+ decoder->compressed_offset += bytes_to_copy;
+ }
+
+ /* once we're out of that, copy from the secondary buffer */
+ if (outputpos < *bytes && decoder->compressed_offset < decoder->compressed_length + decoder->compressed2_length)
+ {
+ uint32_t bytes_to_copy = (uint32_t)MIN(*bytes - outputpos, decoder->compressed2_length - (decoder->compressed_offset - decoder->compressed_length));
+ memcpy(&buffer[outputpos], decoder->compressed2_start + decoder->compressed_offset - decoder->compressed_length, bytes_to_copy);
+ outputpos += bytes_to_copy;
+ decoder->compressed_offset += bytes_to_copy;
+ }
+ *bytes = outputpos;
+
+ /* return based on whether we ran out of data */
+ return (*bytes < expected) ? FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM : FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
+}
+
+/*-------------------------------------------------
+ * metadata_callback - handle STREAMINFO metadata
+ *-------------------------------------------------
+ */
+
+void flac_decoder_metadata_callback_static(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
+{
+ flac_decoder *fldecoder;
+ /* ignore all but STREAMINFO metadata */
+ if (metadata->type != FLAC__METADATA_TYPE_STREAMINFO)
+ return;
+
+ /* parse out the data we care about */
+ fldecoder = (flac_decoder *)(client_data);
+ fldecoder->sample_rate = metadata->data.stream_info.sample_rate;
+ fldecoder->bits_per_sample = metadata->data.stream_info.bits_per_sample;
+ fldecoder->channels = metadata->data.stream_info.channels;
+}
+
+/*-------------------------------------------------
+ * tell_callback - handle requests to find out
+ * where in the input stream we are
+ *-------------------------------------------------
+ */
+
+FLAC__StreamDecoderTellStatus flac_decoder_tell_callback_static(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
+{
+ *absolute_byte_offset = ((flac_decoder *)client_data)->compressed_offset;
+ return FLAC__STREAM_DECODER_TELL_STATUS_OK;
+}
+
+/*-------------------------------------------------
+ * write_callback - handle writes to the output
+ * stream
+ *-------------------------------------------------
+ */
+
+FLAC__StreamDecoderWriteStatus flac_decoder_write_callback_static(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
+{
+ return flac_decoder_write_callback(client_data, frame, buffer);
+}
+
+FLAC__StreamDecoderWriteStatus flac_decoder_write_callback(void *client_data, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
+{
+ int sampnum, chan;
+ int shift, blocksize;
+ flac_decoder * decoder = (flac_decoder *)client_data;
+
+ assert(frame->header.channels == decoder->channels);
+
+ /* interleaved case */
+ shift = decoder->uncompressed_swap ? 8 : 0;
+ blocksize = frame->header.blocksize;
+ if (decoder->uncompressed_start[1] == NULL)
+ {
+ int16_t *dest = decoder->uncompressed_start[0] + decoder->uncompressed_offset * frame->header.channels;
+ for (sampnum = 0; sampnum < blocksize && decoder->uncompressed_offset < decoder->uncompressed_length; sampnum++, decoder->uncompressed_offset++)
+ for (chan = 0; chan < (int)frame->header.channels; chan++)
+ *dest++ = (int16_t)((((uint16_t)buffer[chan][sampnum]) << shift) | (((uint16_t)buffer[chan][sampnum]) >> shift));
+ }
+
+ /* non-interleaved case */
+ else
+ {
+ for (sampnum = 0; sampnum < blocksize && decoder->uncompressed_offset < decoder->uncompressed_length; sampnum++, decoder->uncompressed_offset++)
+ for (chan = 0; chan < (int)frame->header.channels; chan++)
+ if (decoder->uncompressed_start[chan] != NULL)
+ decoder->uncompressed_start[chan][decoder->uncompressed_offset] = (int16_t) ( (((uint16_t)(buffer[chan][sampnum])) << shift) | ( ((uint16_t)(buffer[chan][sampnum])) >> shift) );
+ }
+ return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+}
+
+/**
+ * @fn void flac_decoder::error_callback_static(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
+ *
+ * @brief -------------------------------------------------
+ * error_callback - handle errors (ignore them)
+ * -------------------------------------------------.
+ *
+ * @param decoder The decoder.
+ * @param status The status.
+ * @param [in,out] client_data If non-null, information describing the client.
+ */
+
+void flac_decoder_error_callback_static(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
+{
+}
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