79 #define PARAM_BLOCKSIZE (1 << 7)
80 #define PARAM_MATRIX (1 << 6)
81 #define PARAM_OUTSHIFT (1 << 5)
82 #define PARAM_QUANTSTEP (1 << 4)
83 #define PARAM_FIR (1 << 3)
84 #define PARAM_IIR (1 << 2)
85 #define PARAM_HUFFOFFSET (1 << 1)
86 #define PARAM_PRESENCE (1 << 0)
190 if (!huff_vlc[0].
bits) {
206 unsigned int substr,
unsigned int ch)
215 sign_huff_offset -= 7 << lsb_bits;
218 sign_huff_offset -= 1 << sign_shift;
220 return sign_huff_offset;
227 unsigned int substr,
unsigned int pos)
230 unsigned int mat, channel;
236 for (channel = s->
min_channel; channel <= s->max_channel; channel++) {
240 int lsb_bits = cp->
huff_lsbs - quant_step_size;
244 result =
get_vlc2(gbp, huff_vlc[codebook-1].table,
251 result = (result << lsb_bits) +
get_bits(gbp, lsb_bits);
254 result <<= quant_step_size;
295 "Channel group 2 cannot have more bits per sample than group 1.\n");
301 "Channel groups with differing sample rates are not currently supported.\n");
311 "Sampling rate %d is greater than the supported maximum (%d).\n",
317 "Block size %d is greater than the supported maximum (%d).\n",
323 "Block size pow2 %d is greater than the supported maximum (%d).\n",
336 "%d substreams (more than the "
337 "maximum supported by the decoder)",
427 const uint8_t *buf,
unsigned int substr)
435 int min_channel, max_channel, max_matrix_channel;
442 if (sync_word != 0x31ea >> 1) {
444 "restart header sync incorrect (got 0x%04x)\n", sync_word);
459 max_matrix_channel =
get_bits(gbp, 4);
461 if (max_matrix_channel > std_max_matrix_channel) {
463 "Max matrix channel cannot be greater than %d.\n",
468 if (max_channel != max_matrix_channel) {
470 "Max channel must be equal max matrix channel.\n");
478 "%d channels (more than the "
479 "maximum supported by the decoder)",
484 if (min_channel > max_channel) {
486 "Substream min channel cannot be greater than max channel.\n");
494 #if FF_API_REQUEST_CHANNELS
500 "Extracting %d-channel downmix from substream %d. "
501 "Further substreams will be skipped.\n",
510 "Extracting %d-channel downmix (0x%"PRIx64
") from substream %d. "
511 "Further substreams will be skipped.\n",
526 if (tmp != lossless_check)
528 "Lossless check failed - expected %02x, calculated %02x.\n",
529 lossless_check, tmp);
546 "Assignment of matrix channel %d to invalid output channel %d",
567 for (ch = s->
min_channel; ch <= s->max_channel; ch++) {
592 unsigned int substr,
unsigned int channel,
598 const char fchar = filter ?
'I' :
'F';
610 if (order > max_order) {
612 "%cIR filter order %d is greater than maximum %d.\n",
613 fchar, order, max_order);
620 int coeff_bits, coeff_shift;
626 if (coeff_bits < 1 || coeff_bits > 16) {
628 "%cIR filter coeff_bits must be between 1 and 16.\n",
632 if (coeff_bits + coeff_shift > 16) {
634 "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n",
639 for (i = 0; i < order; i++)
640 fcoeff[i] =
get_sbits(gbp, coeff_bits) << coeff_shift;
643 int state_bits, state_shift;
647 "FIR filter has state data specified.\n");
656 for (i = 0; i < order; i++)
669 unsigned int mat, ch;
683 "Number of primitive matrices cannot be greater than %d.\n",
684 max_primitive_matrices);
689 int frac_bits, max_chan;
696 "Invalid channel %d specified as output from matrix.\n",
700 if (frac_bits > 14) {
702 "Too many fractional bits specified.\n");
710 for (ch = 0; ch <= max_chan; ch++) {
713 coeff_val =
get_sbits(gbp, frac_bits + 2);
715 s->
matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits);
756 "FIR and IIR filters must use the same precision.\n");
828 for (ch = s->
min_channel; ch <= s->max_channel; ch++)
836 #define MSB_MASK(bits) (-1u << bits)
842 unsigned int channel)
851 unsigned int filter_shift = fir->
shift;
872 unsigned int i, ch, expected_stream_pos = 0;
877 expected_stream_pos +=
get_bits(gbp, 16);
879 "Substreams with VLC block size check info");
894 for (ch = s->
min_channel; ch <= s->max_channel; ch++)
911 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2,
912 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62,
913 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5,
914 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40,
915 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34,
916 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30,
917 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36,
918 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69,
919 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24,
920 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20,
921 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23,
922 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8,
923 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40,
924 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37,
925 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52,
926 -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70,
947 uint16_t seed_shr7 = seed >> 7;
951 seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5);
966 uint8_t seed_shr15 = seed >> 15;
968 seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5);
981 unsigned int mat, src_ch, i;
982 unsigned int maxchan;
998 int index2 = 2 * index + 1;
1002 for (i = 0; i < s->
blockpos; i++) {
1007 for (src_ch = 0; src_ch <= maxchan; src_ch++)
1008 accum += (int64_t) samples[src_ch] * coeffs[src_ch];
1010 if (matrix_noise_shift) {
1016 samples[dest_ch] = ((accum >> 14) & mask) + bypassed_lsb;
1024 AVFrame *frame,
int *got_frame_ptr)
1028 unsigned int i, out_ch = 0;
1051 data_16 = (int16_t *)frame->
data[0];
1053 for (i = 0; i < s->
blockpos; i++) {
1059 if (is32) *data_32++ = sample << 8;
1060 else *data_16++ = sample >> 8;
1078 int *got_frame_ptr,
AVPacket *avpkt)
1081 int buf_size = avpkt->
size;
1084 unsigned int length, substr;
1085 unsigned int substream_start;
1086 unsigned int header_size = 4;
1087 unsigned int substr_header_size = 0;
1096 length = (
AV_RB16(buf) & 0xfff) * 2;
1098 if (length < 4 || length > buf_size)
1113 "Stream parameters not seen; skipping frame.\n");
1118 substream_start = 0;
1121 int extraword_present, checkdata_present, end, nonrestart_substr;
1130 substr_header_size += 2;
1132 if (extraword_present) {
1138 substr_header_size += 2;
1146 if (end + header_size + substr_header_size > length) {
1148 "Indicated length of substream %d data goes off end of "
1149 "packet.\n", substr);
1150 end = length - header_size - substr_header_size;
1153 if (end < substream_start) {
1155 "Indicated end offset of substream %d data "
1156 "is smaller than calculated start offset.\n",
1164 substream_parity_present[substr] = checkdata_present;
1165 substream_data_len[substr] = end - substream_start;
1166 substream_start = end;
1172 if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
1177 buf += header_size + substr_header_size;
1209 goto substream_length_mismatch;
1215 if (substream_data_len[substr] * 8 -
get_bits_count(&gb) >= 32) {
1231 if (substream_parity_present[substr]) {
1235 goto substream_length_mismatch;
1240 if ((
get_bits(&gb, 8) ^ parity) != 0xa9 )
1247 goto substream_length_mismatch;
1252 "No restart header present in substream %d.\n", substr);
1254 buf += substream_data_len[substr];
1264 substream_length_mismatch:
1284 #if CONFIG_TRUEHD_DECODER
uint8_t shift
Right shift to apply to output of filter.
static const uint64_t thd_channel_order[]
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
static const int16_t coeffs[28]
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
FilterParams filter_params[NUM_FILTERS]
This structure describes decoded (raw) audio or video data.
static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp, unsigned int substr)
Read decoding parameters that change more often than those in the restart header. ...
#define AV_CH_TOP_FRONT_RIGHT
int8_t noise_buffer[MAX_BLOCKSIZE_POW2]
uint8_t param_presence_flags
Bitmask of which parameter sets are conveyed in a decoding parameter block.
static void generate_2_noise_channels(MLPDecodeContext *m, unsigned int substr)
Noise generation functions.
uint8_t params_valid
Set if a valid major sync block has been read. Otherwise no decoding is possible. ...
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
#define AV_LOG_WARNING
Something somehow does not look correct.
attribute_deprecated int request_channels
Decoder should decode to this many channels if it can (0 for default)
#define AV_CH_TOP_FRONT_LEFT
#define AV_CH_TOP_FRONT_CENTER
#define AV_CH_LOW_FREQUENCY_2
const uint8_t ff_mlp_huffman_tables[3][18][2]
Tables defining the Huffman codes.
#define MAX_BLOCKSIZE_POW2
next power of two greater than MAX_BLOCKSIZE
enum AVMatrixEncoding matrix_encoding
The matrix encoding mode for this substream.
#define MAX_SAMPLERATE
maximum sample frequency seen in files
#define FF_ARRAY_ELEMS(a)
int8_t output_shift[MAX_CHANNELS]
Left shift to apply to decoded PCM values to get final 24-bit output.
#define AV_CH_SURROUND_DIRECT_RIGHT
#define AV_CH_LAYOUT_STEREO
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
static int get_sbits(GetBitContext *s, int n)
int32_t matrix_coeff[MAX_MATRICES][MAX_CHANNELS]
Matrix coefficients, stored as 2.14 fixed point.
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
enum AVSampleFormat sample_fmt
audio sample format
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
static uint8_t xor_32_to_8(uint32_t value)
XOR four bytes into one.
#define MAX_FIR_ORDER
The maximum number of taps in IIR and FIR filters.
uint8_t ch_assign[MAX_CHANNELS]
For each channel output by the matrix, the output channel to map it to.
#define AV_CH_LOW_FREQUENCY
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
static int get_bits_count(const GetBitContext *s)
static void fill_noise_buffer(MLPDecodeContext *m, unsigned int substr)
Generate a block of noise, used when restart sync word == 0x31eb.
int av_get_channel_layout_channel_index(uint64_t channel_layout, uint64_t channel)
Get the index of a channel in channel_layout.
uint8_t restart_seen
Set if a valid restart header has been read. Otherwise the substream cannot be decoded.
bitstream reader API header.
uint8_t min_channel
The index of the first channel coded in this substream.
static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, unsigned int substr, unsigned int channel, unsigned int filter)
Read parameters for one of the prediction filters.
static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, const uint8_t *buf, unsigned int substr)
Read a restart header from a block in a substream.
static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp)
Read parameters for primitive matrices.
static int read_access_unit(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Read an access unit from the stream.
int16_t huff_offset
Offset to apply to residual values.
#define NUM_FILTERS
number of allowed filters
uint8_t max_channel
The index of the last channel coded in this substream.
uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size)
XOR together all the bytes of a buffer.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
ChannelParams channel_params[MAX_CHANNELS]
Channel coding parameters for channels in the substream.
#define MAX_MATRIX_CHANNEL_TRUEHD
static const uint16_t mask[17]
static uint64_t thd_channel_layout_extract_channel(uint64_t channel_layout, int index)
int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS]
uint8_t quant_step_size[MAX_CHANNELS]
Left shift to apply to Huffman-decoded residuals.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
void av_log(void *avcl, int level, const char *fmt,...)
const char * name
Name of the codec implementation.
uint8_t num_substreams
Number of substreams contained within this stream.
uint8_t max_matrix_channel
The number of channels input into the rematrix stage.
uint64_t channel_layout
Audio channel layout.
static av_cold int mlp_decode_init(AVCodecContext *avctx)
common internal API header
static void filter(MpegAudioContext *s, int ch, const short *samples, int incr)
audio channel layout utility functions
#define MAX_MATRIX_CHANNEL_MLP
Last possible matrix channel for each codec.
uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
Calculate an 8-bit checksum over a restart header – a non-multiple-of-8 number of bits...
uint16_t noise_type
restart header data
static int read_channel_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp, unsigned int ch)
Read channel parameters.
int32_t lossless_check_data
Running XOR of all output samples.
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
#define AV_CH_FRONT_LEFT_OF_CENTER
#define AV_CH_FRONT_CENTER
int filter_changed[MAX_CHANNELS][NUM_FILTERS]
uint8_t lsb_bypass[MAX_MATRICES]
Whether the LSBs of the matrix output are encoded in the bitstream.
int32_t coeff[NUM_FILTERS][MAX_FIR_ORDER]
static int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp, unsigned int substr, unsigned int pos)
Read a sample, consisting of either, both or neither of entropy-coded MSBs and plain LSBs...
int access_unit_size
number of PCM samples contained in each frame
#define AV_CH_FRONT_RIGHT_OF_CENTER
int ff_side_data_update_matrix_encoding(AVFrame *frame, enum AVMatrixEncoding matrix_encoding)
Add or update AV_FRAME_DATA_MATRIXENCODING side data.
if(ac->has_optimized_func)
#define AVERROR_PATCHWELCOME
Not yet implemented in Libav, patches welcome.
static int32_t calculate_sign_huff(MLPDecodeContext *m, unsigned int substr, unsigned int ch)
int frame_size
Number of samples per channel in an audio frame.
#define AV_LOG_INFO
Standard information.
uint16_t blocksize
number of PCM samples in current audio block
uint8_t codebook
Which VLC codebook to use to read residuals.
#define MAX_MATRICES_TRUEHD
#define MAX_BLOCKSIZE
maximum number of audio samples within one access unit
Libavcodec external API header.
uint8_t data_check_present
Set if the substream contains extra info to check the size of VLC blocks.
int32_t state[MAX_FIR_ORDER]
int sample_rate
samples per second
av_cold void ff_mlpdsp_init(MLPDSPContext *c)
#define VLC_BITS
number of bits used for VLC lookup - longest Huffman code is 9
SubStream substream[MAX_SUBSTREAMS]
uint8_t order
number of taps in filter
main external API structure.
int is_major_sync_unit
Current access unit being read has a major sync.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS]
static unsigned int get_bits1(GetBitContext *s)
static void skip_bits1(GetBitContext *s)
static void skip_bits(GetBitContext *s, int n)
uint64_t ch_layout
The channel layout for this substream.
static void rematrix_channels(MLPDecodeContext *m, unsigned int substr)
Apply the channel matrices in turn to reconstruct the original audio samples.
static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp, unsigned int substr)
Read a block of PCM residual data (or actual if no filtering active).
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
uint8_t num_primitive_matrices
matrix data
uint8_t max_decoded_substream
Index of the last substream to decode - further substreams are skipped.
static const int8_t noise_table[256]
Data table used for TrueHD noise generation function.
static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
Read a major sync info header - contains high level information about the stream - sample rate...
uint8_t huff_lsbs
Size of residual suffix not encoded using VLC.
uint16_t blockpos
Number of PCM samples decoded so far in this frame.
#define AV_CH_BACK_CENTER
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static av_cold void init_static(void)
Initialize static data, constant between all invocations of the codec.
uint32_t noisegen_seed
The current seed value for the pseudorandom noise generator(s).
#define FF_DISABLE_DEPRECATION_WARNINGS
common internal api header.
uint8_t matrix_out_ch[MAX_MATRICES]
matrix output channel
int access_unit_size_pow2
next power of two above the number of samples in each frame
#define MAX_SUBSTREAMS
Maximum number of substreams that can be decoded.
int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
Read a major sync info header - contains high level information about the stream - sample rate...
static av_cold int init(AVCodecParserContext *s)
uint8_t matrix_noise_shift[MAX_MATRICES]
Left shift to apply to noise values in 0x31eb substreams.
uint8_t noise_shift
The left shift applied to random noise in 0x31ea substreams.
static int output_data(MLPDecodeContext *m, unsigned int substr, AVFrame *frame, int *got_frame_ptr)
Write the audio data into the output buffer.
#define FF_ENABLE_DEPRECATION_WARNINGS
static void filter_channel(MLPDecodeContext *m, unsigned int substr, unsigned int channel)
Generate PCM samples using the prediction filters and residual values read from the data stream...
sample data coding information
int channels
number of audio channels
av_cold void ff_mlp_init_crc(void)
#define AV_CH_SURROUND_DIRECT_LEFT
void(* mlp_filter_channel)(int32_t *state, const int32_t *coeff, int firorder, int iirorder, unsigned int filter_shift, int32_t mask, int blocksize, int32_t *sample_buffer)
#define AV_CH_FRONT_RIGHT
#define MAX_MATRICES_MLP
Maximum number of matrices used in decoding; most streams have one matrix per output channel...
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame
int32_t sign_huff_offset
sign/rounding-corrected version of huff_offset
uint8_t ff_mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
MLP uses checksums that seem to be based on the standard CRC algorithm, but are not (in implementatio...