#include "libavutil/crc.h"
#include "parser.h"
#include "mlp_parser.h"
-
-/** Maximum number of channels that can be decoded. */
-#define MAX_CHANNELS 16
-
-/** Maximum number of matrices used in decoding; most streams have one matrix
- * per output channel, but some rematrix a channel (usually 0) more than once.
- */
-
-#define MAX_MATRICES 15
-
-/** Maximum number of substreams that can be decoded. This could also be set
- * higher, but I haven't seen any examples with more than two. */
-#define MAX_SUBSTREAMS 2
-
-/** maximum sample frequency seen in files */
-#define MAX_SAMPLERATE 192000
-
-/** maximum number of audio samples within one access unit */
-#define MAX_BLOCKSIZE (40 * (MAX_SAMPLERATE / 48000))
-/** next power of two greater than MAX_BLOCKSIZE */
-#define MAX_BLOCKSIZE_POW2 (64 * (MAX_SAMPLERATE / 48000))
-
-/** number of allowed filters */
-#define NUM_FILTERS 2
-
-/** The maximum number of taps in either the IIR or FIR filter;
- * I believe MLP actually specifies the maximum order for IIR filters as four,
- * and that the sum of the orders of both filters must be <= 8. */
-#define MAX_FILTER_ORDER 8
+#include "mlp.h"
/** number of bits used for VLC lookup - longest Huffman code is 9 */
#define VLC_BITS 9
} SubStream;
-#define FIR 0
-#define IIR 1
-
-/** filter data */
-typedef struct {
- //! number of taps in filter
- uint8_t order;
- //! Right shift to apply to output of filter.
- uint8_t shift;
-
- int32_t coeff[MAX_FILTER_ORDER];
- int32_t state[MAX_FILTER_ORDER];
-} FilterParams;
-
typedef struct MLPDecodeContext {
AVCodecContext *avctx;
SubStream substream[MAX_SUBSTREAMS];
- FilterParams filter_params[MAX_CHANNELS][NUM_FILTERS];
-
- //@{
- /** sample data coding information */
- //! Offset to apply to residual values.
- int16_t huff_offset[MAX_CHANNELS];
- //! sign/rounding-corrected version of huff_offset
- int32_t sign_huff_offset[MAX_CHANNELS];
- //! Which VLC codebook to use to read residuals.
- uint8_t codebook[MAX_CHANNELS];
- //! Size of residual suffix not encoded using VLC.
- uint8_t huff_lsbs[MAX_CHANNELS];
- //@}
+ ChannelParams channel_params[MAX_CHANNELS];
int8_t noise_buffer[MAX_BLOCKSIZE_POW2];
int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS];
int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS+2];
} MLPDecodeContext;
-/** Tables defining the Huffman codes.
- * There are three entropy coding methods used in MLP (four if you count
- * "none" as a method). These use the same sequences for codes starting with
- * 00 or 01, but have different codes starting with 1. */
-
-static const uint8_t huffman_tables[3][18][2] = {
- { /* Huffman table 0, -7 - +10 */
- {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
- {0x04, 3}, {0x05, 3}, {0x06, 3}, {0x07, 3},
- {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
- }, { /* Huffman table 1, -7 - +8 */
- {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
- {0x02, 2}, {0x03, 2},
- {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
- }, { /* Huffman table 2, -7 - +7 */
- {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
- {0x01, 1},
- {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
- }
-};
-
static VLC huff_vlc[3];
-static int crc_init = 0;
-static AVCRC crc_63[1024];
-static AVCRC crc_1D[1024];
-
-
/** Initialize static data, constant between all invocations of the codec. */
static av_cold void init_static()
{
INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18,
- &huffman_tables[0][0][1], 2, 1,
- &huffman_tables[0][0][0], 2, 1, 512);
+ &ff_mlp_huffman_tables[0][0][1], 2, 1,
+ &ff_mlp_huffman_tables[0][0][0], 2, 1, 512);
INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16,
- &huffman_tables[1][0][1], 2, 1,
- &huffman_tables[1][0][0], 2, 1, 512);
+ &ff_mlp_huffman_tables[1][0][1], 2, 1,
+ &ff_mlp_huffman_tables[1][0][0], 2, 1, 512);
INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15,
- &huffman_tables[2][0][1], 2, 1,
- &huffman_tables[2][0][0], 2, 1, 512);
+ &ff_mlp_huffman_tables[2][0][1], 2, 1,
+ &ff_mlp_huffman_tables[2][0][0], 2, 1, 512);
- if (!crc_init) {
- av_crc_init(crc_63, 0, 8, 0x63, sizeof(crc_63));
- av_crc_init(crc_1D, 0, 8, 0x1D, sizeof(crc_1D));
- crc_init = 1;
- }
-}
-
-
-/** MLP uses checksums that seem to be based on the standard CRC algorithm, but
- * are not (in implementation terms, the table lookup and XOR are reversed).
- * We can implement this behavior using a standard av_crc on all but the
- * last element, then XOR that with the last element. */
-
-static uint8_t mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
-{
- uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c
- checksum ^= buf[buf_size-1];
- return checksum;
-}
-
-/** Calculate an 8-bit checksum over a restart header -- a non-multiple-of-8
- * number of bits, starting two bits into the first byte of buf. */
-
-static uint8_t mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
-{
- int i;
- int num_bytes = (bit_size + 2) / 8;
-
- int crc = crc_1D[buf[0] & 0x3f];
- crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2);
- crc ^= buf[num_bytes - 1];
-
- for (i = 0; i < ((bit_size + 2) & 7); i++) {
- crc <<= 1;
- if (crc & 0x100)
- crc ^= 0x11D;
- crc ^= (buf[num_bytes] >> (7 - i)) & 1;
- }
-
- return crc;
+ ff_mlp_init_crc();
}
static inline int32_t calculate_sign_huff(MLPDecodeContext *m,
unsigned int substr, unsigned int ch)
{
+ ChannelParams *cp = &m->channel_params[ch];
SubStream *s = &m->substream[substr];
- int lsb_bits = m->huff_lsbs[ch] - s->quant_step_size[ch];
- int sign_shift = lsb_bits + (m->codebook[ch] ? 2 - m->codebook[ch] : -1);
- int32_t sign_huff_offset = m->huff_offset[ch];
+ int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch];
+ int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1);
+ int32_t sign_huff_offset = cp->huff_offset;
- if (m->codebook[ch] > 0)
+ if (cp->codebook > 0)
sign_huff_offset -= 7 << lsb_bits;
if (sign_shift >= 0)
m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp);
for (channel = s->min_channel; channel <= s->max_channel; channel++) {
- int codebook = m->codebook[channel];
+ ChannelParams *cp = &m->channel_params[channel];
+ int codebook = cp->codebook;
int quant_step_size = s->quant_step_size[channel];
- int lsb_bits = m->huff_lsbs[channel] - quant_step_size;
+ int lsb_bits = cp->huff_lsbs - quant_step_size;
int result = 0;
if (codebook > 0)
if (lsb_bits > 0)
result = (result << lsb_bits) + get_bits(gbp, lsb_bits);
- result += m->sign_huff_offset[channel];
+ result += cp->sign_huff_offset;
result <<= quant_step_size;
m->sample_buffer[pos + s->blockpos][channel] = result;
lossless_check = get_bits(gbp, 8);
if (substr == m->max_decoded_substream
&& s->lossless_check_data != 0xffffffff) {
- tmp = s->lossless_check_data;
- tmp ^= tmp >> 16;
- tmp ^= tmp >> 8;
- tmp &= 0xff;
+ tmp = xor_32_to_8(s->lossless_check_data);
if (tmp != lossless_check)
av_log(m->avctx, AV_LOG_WARNING,
"Lossless check failed - expected %02x, calculated %02x.\n",
}
}
- checksum = mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
+ checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
if (checksum != get_bits(gbp, 8))
av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n");
memset(s->quant_step_size, 0, sizeof(s->quant_step_size));
for (ch = s->min_channel; ch <= s->max_channel; ch++) {
- m->filter_params[ch][FIR].order = 0;
- m->filter_params[ch][IIR].order = 0;
- m->filter_params[ch][FIR].shift = 0;
- m->filter_params[ch][IIR].shift = 0;
+ ChannelParams *cp = &m->channel_params[ch];
+ cp->filter_params[FIR].order = 0;
+ cp->filter_params[IIR].order = 0;
+ cp->filter_params[FIR].shift = 0;
+ cp->filter_params[IIR].shift = 0;
/* Default audio coding is 24-bit raw PCM. */
- m->huff_offset [ch] = 0;
- m->sign_huff_offset[ch] = (-1) << 23;
- m->codebook [ch] = 0;
- m->huff_lsbs [ch] = 24;
+ cp->huff_offset = 0;
+ cp->sign_huff_offset = (-1) << 23;
+ cp->codebook = 0;
+ cp->huff_lsbs = 24;
}
if (substr == m->max_decoded_substream) {
static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
unsigned int channel, unsigned int filter)
{
- FilterParams *fp = &m->filter_params[channel][filter];
+ FilterParams *fp = &m->channel_params[channel].filter_params[filter];
const char fchar = filter ? 'I' : 'F';
int i, order;
if (s->param_presence_flags & PARAM_QUANTSTEP)
if (get_bits1(gbp))
for (ch = 0; ch <= s->max_channel; ch++) {
+ ChannelParams *cp = &m->channel_params[ch];
+
s->quant_step_size[ch] = get_bits(gbp, 4);
/* TODO: validate */
- m->sign_huff_offset[ch] = calculate_sign_huff(m, substr, ch);
+ cp->sign_huff_offset = calculate_sign_huff(m, substr, ch);
}
for (ch = s->min_channel; ch <= s->max_channel; ch++)
if (get_bits1(gbp)) {
- FilterParams *fir = &m->filter_params[ch][FIR];
- FilterParams *iir = &m->filter_params[ch][IIR];
+ ChannelParams *cp = &m->channel_params[ch];
+ FilterParams *fir = &cp->filter_params[FIR];
+ FilterParams *iir = &cp->filter_params[IIR];
if (s->param_presence_flags & PARAM_FIR)
if (get_bits1(gbp))
if (s->param_presence_flags & PARAM_HUFFOFFSET)
if (get_bits1(gbp))
- m->huff_offset[ch] = get_sbits(gbp, 15);
+ cp->huff_offset = get_sbits(gbp, 15);
- m->codebook [ch] = get_bits(gbp, 2);
- m->huff_lsbs[ch] = get_bits(gbp, 5);
+ cp->codebook = get_bits(gbp, 2);
+ cp->huff_lsbs = get_bits(gbp, 5);
- m->sign_huff_offset[ch] = calculate_sign_huff(m, substr, ch);
+ cp->sign_huff_offset = calculate_sign_huff(m, substr, ch);
/* TODO: validate */
}
{
SubStream *s = &m->substream[substr];
int32_t filter_state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FILTER_ORDER];
- FilterParams *fp[NUM_FILTERS] = { &m->filter_params[channel][FIR],
- &m->filter_params[channel][IIR], };
+ FilterParams *fp[NUM_FILTERS] = { &m->channel_params[channel].filter_params[FIR],
+ &m->channel_params[channel].filter_params[IIR], };
unsigned int filter_shift = fp[FIR]->shift;
int32_t mask = MSB_MASK(s->quant_step_size[channel]);
int index = MAX_BLOCKSIZE;
}
-/** XOR together all the bytes of a buffer.
- * Does this belong in dspcontext? */
-
-static uint8_t calculate_parity(const uint8_t *buf, unsigned int buf_size)
-{
- uint32_t scratch = 0;
- const uint8_t *buf_end = buf + buf_size;
-
- for (; buf < buf_end - 3; buf += 4)
- scratch ^= *((const uint32_t*)buf);
-
- scratch ^= scratch >> 16;
- scratch ^= scratch >> 8;
-
- for (; buf < buf_end; buf++)
- scratch ^= *buf;
-
- return scratch;
-}
-
/** Read an access unit from the stream.
* Returns < 0 on error, 0 if not enough data is present in the input stream
* otherwise returns the number of bytes consumed. */
substream_start = end;
}
- parity_bits = calculate_parity(buf, 4);
- parity_bits ^= calculate_parity(buf + header_size, substr_header_size);
+ parity_bits = ff_mlp_calculate_parity(buf, 4);
+ parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size);
if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n");
skip_bits(&gb, (-get_bits_count(&gb)) & 15);
if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32 &&
- (show_bits_long(&gb, 32) == 0xd234d234 ||
+ (show_bits_long(&gb, 32) == END_OF_STREAM ||
show_bits_long(&gb, 20) == 0xd234e)) {
skip_bits(&gb, 18);
if (substr == m->max_decoded_substream)
substream_parity_present[substr]) {
uint8_t parity, checksum;
- parity = calculate_parity(buf, substream_data_len[substr] - 2);
+ parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2);
if ((parity ^ get_bits(&gb, 8)) != 0xa9)
av_log(m->avctx, AV_LOG_ERROR,
"Substream %d parity check failed.\n", substr);
- checksum = mlp_checksum8(buf, substream_data_len[substr] - 2);
+ checksum = ff_mlp_checksum8(buf, substream_data_len[substr] - 2);
if (checksum != get_bits(&gb, 8))
av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n",
substr);
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