diff options
Diffstat (limited to 'deps/libchdr/flac.c')
| -rw-r--r-- | deps/libchdr/flac.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/deps/libchdr/flac.c b/deps/libchdr/flac.c new file mode 100644 index 0000000..29844b6 --- /dev/null +++ b/deps/libchdr/flac.c @@ -0,0 +1,331 @@ +// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+/***************************************************************************
+
+ flac.c
+
+ FLAC compression wrappers
+
+***************************************************************************/
+
+#include <assert.h>
+#include <string.h>
+#include "flac.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);
+
+// getters (valid after reset)
+static uint32_t sample_rate(flac_decoder *decoder) { return decoder->sample_rate; }
+static uint8_t channels(flac_decoder *decoder) { return decoder->channels; }
+static uint8_t bits_per_sample(flac_decoder *decoder) { return decoder->bits_per_sample; }
+static uint32_t total_samples(flac_decoder *decoder) { return FLAC__stream_decoder_get_total_samples(decoder->decoder); }
+static FLAC__StreamDecoderState state(flac_decoder *decoder) { return FLAC__stream_decoder_get_state(decoder->decoder); }
+static const char *state_string(flac_decoder *decoder) { return FLAC__stream_decoder_get_resolved_state_string(decoder->decoder); }
+
+//-------------------------------------------------
+// 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;
+}
+
+
+/*
+//-------------------------------------------------
+// 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_LENGTH(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;
+}
+*/
+
+//-------------------------------------------------
+// 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 position;
+}
+
+
+//-------------------------------------------------
+// read_callback - handle reads from the input
+// stream
+//-------------------------------------------------
+
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+
+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 = *bytes;
+
+ // copy from primary buffer first
+ uint32_t outputpos = 0;
+ if (outputpos < *bytes && decoder->compressed_offset < decoder->compressed_length)
+ {
+ uint32_t bytes_to_copy = 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 = 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 shift, blocksize;
+ flac_decoder * decoder = (flac_decoder *)client_data;
+
+ assert(frame->header.channels == channels(decoder));
+
+ // interleaved case
+ shift = decoder->uncompressed_swap ? 8 : 0;
+ blocksize = frame->header.blocksize;
+
+ if (decoder->uncompressed_start[1] == NULL)
+ {
+ int sampnum, chan;
+ 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 < frame->header.channels; chan++)
+ *dest++ = (int16_t)((((uint16_t)buffer[chan][sampnum]) << shift) | (((uint16_t)buffer[chan][sampnum]) >> shift));
+ }
+
+ // non-interleaved case
+ else
+ {
+ int sampnum, chan;
+ for (sampnum = 0; sampnum < blocksize && decoder->uncompressed_offset < decoder->uncompressed_length; sampnum++, decoder->uncompressed_offset++)
+ for (chan = 0; chan < 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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