[pcsx_rearmed.git] / deps / libchdr / src / libchdr_flac.c

/* license:BSD-3-Clause
 * copyright-holders:Aaron Giles
***************************************************************************

    flac.c

    FLAC compression wrappers

***************************************************************************/

#include <assert.h>
#include <string.h>

#include <libchdr/flac.h>
#define DR_FLAC_IMPLEMENTATION
#include <dr_libs/dr_flac.h>

/***************************************************************************
 *  FLAC DECODER
 ***************************************************************************
 */

static size_t flac_decoder_read_callback(void *userdata, void *buffer, size_t bytes);
static drflac_bool32 flac_decoder_seek_callback(void *userdata, int offset, drflac_seek_origin origin);
static void flac_decoder_metadata_callback(void *userdata, drflac_metadata *metadata);
static void flac_decoder_write_callback(void *userdata, void *buffer, size_t len);


/* 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; }

/*-------------------------------------------------
 *  flac_decoder - constructor
 *-------------------------------------------------
 */

int flac_decoder_init(flac_decoder *decoder)
{
	decoder->decoder = NULL;
	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;
	return 0;
}

/*-------------------------------------------------
 *  flac_decoder - destructor
 *-------------------------------------------------
 */

void flac_decoder_free(flac_decoder* decoder)
{
	if ((decoder != NULL) && (decoder->decoder != NULL))
		drflac_close(decoder->decoder);
	decoder->decoder = NULL;
}

/*-------------------------------------------------
 *  reset - reset state with the original
 *  parameters
 *-------------------------------------------------
 */

static int flac_decoder_internal_reset(flac_decoder* decoder)
{
	decoder->compressed_offset = 0;
	flac_decoder_free(decoder);
	decoder->decoder = drflac_open_with_metadata(
		flac_decoder_read_callback, flac_decoder_seek_callback,
		flac_decoder_metadata_callback, decoder, NULL);
	return (decoder->decoder != NULL);
}

/*-------------------------------------------------
 *  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*num_channels) >> 8;
	decoder->custom_header[0x09] = decoder->custom_header[0x0b] = (block_size*num_channels) & 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 uint8_t *)(decoder->custom_header);
	decoder->compressed_length = sizeof(decoder->custom_header);
	decoder->compressed2_start = (const uint8_t *)(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;

#define	BUFFER	2352	/* bytes per CD audio sector */
	int16_t buffer[BUFFER];
	uint32_t buf_samples = BUFFER / channels(decoder);
	/* loop until we get everything we want */
	while (decoder->uncompressed_offset < decoder->uncompressed_length) {
		uint32_t frames = (num_samples < buf_samples ? num_samples : buf_samples);
		if (!drflac_read_pcm_frames_s16(decoder->decoder, frames, buffer))
			return 0;
		flac_decoder_write_callback(decoder, buffer, frames*sizeof(*buffer)*channels(decoder));
		num_samples -= frames;
	}
	return 1;
}

/*-------------------------------------------------
 *  finish - finish up the decode
 *-------------------------------------------------
 */

uint32_t flac_decoder_finish(flac_decoder* decoder)
{
	/* get the final decoding position and move forward */
	drflac *flac = decoder->decoder;
	uint64_t position = decoder->compressed_offset;

	/* ugh... there's no function to obtain bytes used in drflac :-/ */
	position -= DRFLAC_CACHE_L2_LINES_REMAINING(&flac->bs) * sizeof(drflac_cache_t);
	position -= DRFLAC_CACHE_L1_BITS_REMAINING(&flac->bs) / 8;
	position -= flac->bs.unalignedByteCount;

	/* adjust position if we provided the header */
	if (position == 0)
		return 0;
	if (decoder->compressed_start == (const uint8_t *)(decoder->custom_header))
		position -= decoder->compressed_length;

	flac_decoder_free(decoder);
	return position;
}

/*-------------------------------------------------
 *  read_callback - handle reads from the input
 *  stream
 *-------------------------------------------------
 */

#define MIN(x, y) ((x) < (y) ? (x) : (y))

static size_t flac_decoder_read_callback(void *userdata, void *buffer, size_t bytes)
{
	flac_decoder* decoder = (flac_decoder*)userdata;
	uint8_t *dst = buffer;

	/* 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(&dst[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(&dst[outputpos], decoder->compressed2_start + decoder->compressed_offset - decoder->compressed_length, bytes_to_copy);
		outputpos += bytes_to_copy;
		decoder->compressed_offset += bytes_to_copy;
	}

	return outputpos;
}

/*-------------------------------------------------
 *  metadata_callback - handle STREAMINFO metadata
 *-------------------------------------------------
 */

static void flac_decoder_metadata_callback(void *userdata, drflac_metadata *metadata)
{
	flac_decoder *decoder = userdata;

	/* ignore all but STREAMINFO metadata */
	if (metadata->type != DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO)
		return;

	/* parse out the data we care about */
	decoder->sample_rate = metadata->data.streaminfo.sampleRate;
	decoder->bits_per_sample = metadata->data.streaminfo.bitsPerSample;
	decoder->channels = metadata->data.streaminfo.channels;
}

/*-------------------------------------------------
 *  write_callback - handle writes to the output
 *  stream
 *-------------------------------------------------
 */

static void flac_decoder_write_callback(void *userdata, void *buffer, size_t bytes)
{
	int sampnum, chan;
	int shift, blocksize;
	flac_decoder * decoder = (flac_decoder *)userdata;
	int16_t *sampbuf = (int16_t *)buffer;
	int sampch = channels(decoder);
	uint32_t offset = decoder->uncompressed_offset;
	uint16_t usample;

	/* interleaved case */
	shift = decoder->uncompressed_swap ? 8 : 0;
	blocksize = bytes / (sampch * sizeof(sampbuf[0]));
	if (decoder->uncompressed_start[1] == NULL)
	{
		int16_t *dest = decoder->uncompressed_start[0] + offset * sampch;
		for (sampnum = 0; sampnum < blocksize && offset < decoder->uncompressed_length; sampnum++, offset++)
			for (chan = 0; chan < sampch; chan++) {
				usample = (uint16_t)*sampbuf++;
				*dest++ = (int16_t)((usample << shift) | (usample >> shift));
			}
	}

	/* non-interleaved case */
	else
	{
		for (sampnum = 0; sampnum < blocksize && offset < decoder->uncompressed_length; sampnum++, offset++)
			for (chan = 0; chan < sampch; chan++) {
				usample = (uint16_t)*sampbuf++;
				if (decoder->uncompressed_start[chan] != NULL)
					decoder->uncompressed_start[chan][offset] = (int16_t) ((usample << shift) | (usample >> shift));
			}
	}
	decoder->uncompressed_offset = offset;
}


/*-------------------------------------------------
 *  seek_callback - handle seeks on the output
 *  stream
 *-------------------------------------------------
 */

static drflac_bool32 flac_decoder_seek_callback(void *userdata, int offset, drflac_seek_origin origin)
{
	flac_decoder * decoder = (flac_decoder *)userdata;
	uint32_t length = decoder->compressed_length + decoder->compressed2_length;

	if (origin == drflac_seek_origin_start) {
		uint32_t pos = offset;
		if (pos <= length) {
			decoder->compressed_offset = pos;
			return 1;
		}
	} else if (origin == drflac_seek_origin_current) {
		uint32_t pos = decoder->compressed_offset + offset;
		if (pos <= length) {
			decoder->compressed_offset = pos;
			return 1;
		}
	}
	return 0;
}
Commit	Line	Data
b24e7fce	1	/* license:BSD-3-Clause
	2	* copyright-holders:Aaron Giles
	3	***************************************************************************
	4
	5	flac.c
	6
	7	FLAC compression wrappers
	8
	9	***************************************************************************/
	10
	11	#include <assert.h>
	12	#include <string.h>
	13
	14	#include <libchdr/flac.h>
	15	#define DR_FLAC_IMPLEMENTATION
	16	#include <dr_libs/dr_flac.h>
	17
	18	/***************************************************************************
	19	* FLAC DECODER
	20	***************************************************************************
	21	*/
	22
	23	static size_t flac_decoder_read_callback(void userdata, void buffer, size_t bytes);
	24	static drflac_bool32 flac_decoder_seek_callback(void *userdata, int offset, drflac_seek_origin origin);
	25	static void flac_decoder_metadata_callback(void userdata, drflac_metadata metadata);
	26	static void flac_decoder_write_callback(void userdata, void buffer, size_t len);
	27
	28
	29	/* getters (valid after reset) */
	30	static uint32_t sample_rate(flac_decoder *decoder) { return decoder->sample_rate; }
	31	static uint8_t channels(flac_decoder *decoder) { return decoder->channels; }
	32	static uint8_t bits_per_sample(flac_decoder *decoder) { return decoder->bits_per_sample; }
	33
	34	/*-------------------------------------------------
	35	* flac_decoder - constructor
	36	*-------------------------------------------------
	37	*/
	38
	39	int flac_decoder_init(flac_decoder *decoder)
	40	{
	41	decoder->decoder = NULL;
	42	decoder->sample_rate = 0;
	43	decoder->channels = 0;
	44	decoder->bits_per_sample = 0;
	45	decoder->compressed_offset = 0;
	46	decoder->compressed_start = NULL;
	47	decoder->compressed_length = 0;
	48	decoder->compressed2_start = NULL;
	49	decoder->compressed2_length = 0;
	50	decoder->uncompressed_offset = 0;
	51	decoder->uncompressed_length = 0;
	52	decoder->uncompressed_swap = 0;
	53	return 0;
	54	}
	55
	56	/*-------------------------------------------------
	57	* flac_decoder - destructor
	58	*-------------------------------------------------
	59	*/
	60
	61	void flac_decoder_free(flac_decoder* decoder)
	62	{
	63	if ((decoder != NULL) && (decoder->decoder != NULL))
	64	drflac_close(decoder->decoder);
65	decoder->decoder = NULL;
66	}
67
68	/*-------------------------------------------------
69	* reset - reset state with the original
70	* parameters
71	*-------------------------------------------------
72	*/
73
74	static int flac_decoder_internal_reset(flac_decoder* decoder)
75	{
76	decoder->compressed_offset = 0;
77	flac_decoder_free(decoder);
78	decoder->decoder = drflac_open_with_metadata(
79	flac_decoder_read_callback, flac_decoder_seek_callback,
80	flac_decoder_metadata_callback, decoder, NULL);
81	return (decoder->decoder != NULL);
82	}
83
84	/*-------------------------------------------------
85	* reset - reset state with new memory parameters
86	* and a custom-generated header
87	*-------------------------------------------------
88	*/
89
90	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)
91	{
92	/* modify the template header with our parameters */
93	static const uint8_t s_header_template[0x2a] =
94	{
95	0x66, 0x4C, 0x61, 0x43, /* +00: 'fLaC' stream header */
96	0x80, /* +04: metadata block type 0 (STREAMINFO), */
97	/* flagged as last block */
98	0x00, 0x00, 0x22, /* +05: metadata block length = 0x22 */
99	0x00, 0x00, /* +08: minimum block size */
100	0x00, 0x00, /* +0A: maximum block size */
101	0x00, 0x00, 0x00, /* +0C: minimum frame size (0 == unknown) */
102	0x00, 0x00, 0x00, /* +0F: maximum frame size (0 == unknown) */
103	0x0A, 0xC4, 0x42, 0xF0, 0x00, 0x00, 0x00, 0x00, /* +12: sample rate (0x0ac44 == 44100), */
104	/* numchannels (2), sample bits (16), */
105	/* samples in stream (0 == unknown) */
106	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* +1A: MD5 signature (0 == none) */
107	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* +2A: start of stream data */
108	};
109	memcpy(decoder->custom_header, s_header_template, sizeof(s_header_template));
110	decoder->custom_header[0x08] = decoder->custom_header[0x0a] = (block_size*num_channels) >> 8;
111	decoder->custom_header[0x09] = decoder->custom_header[0x0b] = (block_size*num_channels) & 0xff;
112	decoder->custom_header[0x12] = sample_rate >> 12;
113	decoder->custom_header[0x13] = sample_rate >> 4;
114	decoder->custom_header[0x14] = (sample_rate << 4) \| ((num_channels - 1) << 1);
115
116	/* configure the header ahead of the provided buffer */
117	decoder->compressed_start = (const uint8_t *)(decoder->custom_header);
118	decoder->compressed_length = sizeof(decoder->custom_header);
119	decoder->compressed2_start = (const uint8_t *)(buffer);
120	decoder->compressed2_length = length;
121	return flac_decoder_internal_reset(decoder);
122	}
123
124	/*-------------------------------------------------
125	* decode_interleaved - decode to an interleaved
126	* sound stream
127	*-------------------------------------------------
128	*/
129
130	int flac_decoder_decode_interleaved(flac_decoder* decoder, int16_t *samples, uint32_t num_samples, int swap_endian)
131	{
132	/* configure the uncompressed buffer */
133	memset(decoder->uncompressed_start, 0, sizeof(decoder->uncompressed_start));
134	decoder->uncompressed_start[0] = samples;
135	decoder->uncompressed_offset = 0;
136	decoder->uncompressed_length = num_samples;
137	decoder->uncompressed_swap = swap_endian;
138
139	#define BUFFER 2352 /* bytes per CD audio sector */
140	int16_t buffer[BUFFER];
141	uint32_t buf_samples = BUFFER / channels(decoder);
142	/* loop until we get everything we want */
143	while (decoder->uncompressed_offset < decoder->uncompressed_length) {
144	uint32_t frames = (num_samples < buf_samples ? num_samples : buf_samples);
145	if (!drflac_read_pcm_frames_s16(decoder->decoder, frames, buffer))
146	return 0;
147	flac_decoder_write_callback(decoder, buffer, framessizeof(buffer)*channels(decoder));
148	num_samples -= frames;
149	}
150	return 1;
151	}
152
153	/*-------------------------------------------------
154	* finish - finish up the decode
155	*-------------------------------------------------
156	*/
157
158	uint32_t flac_decoder_finish(flac_decoder* decoder)
159	{
160	/* get the final decoding position and move forward */
161	drflac *flac = decoder->decoder;
162	uint64_t position = decoder->compressed_offset;
163
164	/* ugh... there's no function to obtain bytes used in drflac :-/ */
165	position -= DRFLAC_CACHE_L2_LINES_REMAINING(&flac->bs) * sizeof(drflac_cache_t);
166	position -= DRFLAC_CACHE_L1_BITS_REMAINING(&flac->bs) / 8;
167	position -= flac->bs.unalignedByteCount;
168
169	/* adjust position if we provided the header */
170	if (position == 0)
171	return 0;
172	if (decoder->compressed_start == (const uint8_t *)(decoder->custom_header))
173	position -= decoder->compressed_length;
174
175	flac_decoder_free(decoder);
176	return position;
177	}
178
179	/*-------------------------------------------------
180	* read_callback - handle reads from the input
181	* stream
182	*-------------------------------------------------
183	*/
184
185	#define MIN(x, y) ((x) < (y) ? (x) : (y))
186
187	static size_t flac_decoder_read_callback(void userdata, void buffer, size_t bytes)
188	{
189	flac_decoder* decoder = (flac_decoder*)userdata;
190	uint8_t *dst = buffer;
191
192	/* copy from primary buffer first */
193	uint32_t outputpos = 0;
194	if (outputpos < bytes && decoder->compressed_offset < decoder->compressed_length)
195	{
196	uint32_t bytes_to_copy = MIN(bytes - outputpos, decoder->compressed_length - decoder->compressed_offset);
197	memcpy(&dst[outputpos], decoder->compressed_start + decoder->compressed_offset, bytes_to_copy);
198	outputpos += bytes_to_copy;
199	decoder->compressed_offset += bytes_to_copy;
200	}
201
202	/* once we're out of that, copy from the secondary buffer */
203	if (outputpos < bytes && decoder->compressed_offset < decoder->compressed_length + decoder->compressed2_length)
204	{
205	uint32_t bytes_to_copy = MIN(bytes - outputpos, decoder->compressed2_length - (decoder->compressed_offset - decoder->compressed_length));
206	memcpy(&dst[outputpos], decoder->compressed2_start + decoder->compressed_offset - decoder->compressed_length, bytes_to_copy);
207	outputpos += bytes_to_copy;
208	decoder->compressed_offset += bytes_to_copy;
209	}
210
211	return outputpos;
212	}
213
214	/*-------------------------------------------------
215	* metadata_callback - handle STREAMINFO metadata
216	*-------------------------------------------------
217	*/
218
219	static void flac_decoder_metadata_callback(void userdata, drflac_metadata metadata)
220	{
221	flac_decoder *decoder = userdata;
222
223	/* ignore all but STREAMINFO metadata */
224	if (metadata->type != DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO)
225	return;
226
227	/* parse out the data we care about */
228	decoder->sample_rate = metadata->data.streaminfo.sampleRate;
229	decoder->bits_per_sample = metadata->data.streaminfo.bitsPerSample;
230	decoder->channels = metadata->data.streaminfo.channels;
231	}
232
233	/*-------------------------------------------------
234	* write_callback - handle writes to the output
235	* stream
236	*-------------------------------------------------
237	*/
238
239	static void flac_decoder_write_callback(void userdata, void buffer, size_t bytes)
240	{
241	int sampnum, chan;
242	int shift, blocksize;
243	flac_decoder * decoder = (flac_decoder *)userdata;
244	int16_t sampbuf = (int16_t )buffer;
245	int sampch = channels(decoder);
246	uint32_t offset = decoder->uncompressed_offset;
247	uint16_t usample;
248
249	/* interleaved case */
250	shift = decoder->uncompressed_swap ? 8 : 0;
251	blocksize = bytes / (sampch * sizeof(sampbuf[0]));
252	if (decoder->uncompressed_start[1] == NULL)
253	{
254	int16_t dest = decoder->uncompressed_start[0] + offset sampch;
255	for (sampnum = 0; sampnum < blocksize && offset < decoder->uncompressed_length; sampnum++, offset++)
256	for (chan = 0; chan < sampch; chan++) {
257	usample = (uint16_t)*sampbuf++;
258	*dest++ = (int16_t)((usample << shift) \| (usample >> shift));
259	}
260	}
261
262	/* non-interleaved case */
263	else
264	{
265	for (sampnum = 0; sampnum < blocksize && offset < decoder->uncompressed_length; sampnum++, offset++)
266	for (chan = 0; chan < sampch; chan++) {
267	usample = (uint16_t)*sampbuf++;
268	if (decoder->uncompressed_start[chan] != NULL)
269	decoder->uncompressed_start[chan][offset] = (int16_t) ((usample << shift) \| (usample >> shift));
270	}
271	}
272	decoder->uncompressed_offset = offset;
273	}
274
275
276	/*-------------------------------------------------
277	* seek_callback - handle seeks on the output
278	* stream
279	*-------------------------------------------------
280	*/
281
282	static drflac_bool32 flac_decoder_seek_callback(void *userdata, int offset, drflac_seek_origin origin)
283	{
284	flac_decoder * decoder = (flac_decoder *)userdata;
285	uint32_t length = decoder->compressed_length + decoder->compressed2_length;
286
287	if (origin == drflac_seek_origin_start) {
288	uint32_t pos = offset;
289	if (pos <= length) {
290	decoder->compressed_offset = pos;
291	return 1;
292	}
293	} else if (origin == drflac_seek_origin_current) {
294	uint32_t pos = decoder->compressed_offset + offset;
295	if (pos <= length) {
296	decoder->compressed_offset = pos;
297	return 1;
298	}
299	}
300	return 0;
301	}
302