76 #define PARAM_BLOCKSIZE (1 << 7)
77 #define PARAM_MATRIX (1 << 6)
78 #define PARAM_OUTSHIFT (1 << 5)
79 #define PARAM_QUANTSTEP (1 << 4)
80 #define PARAM_FIR (1 << 3)
81 #define PARAM_IIR (1 << 2)
82 #define PARAM_HUFFOFFSET (1 << 1)
83 #define PARAM_PRESENCE (1 << 0)
188 if (!huff_vlc[0].
bits) {
204 unsigned int substr,
unsigned int ch)
213 sign_huff_offset -= 7 << lsb_bits;
216 sign_huff_offset -= 1 << sign_shift;
218 return sign_huff_offset;
225 unsigned int substr,
unsigned int pos)
228 unsigned int mat, channel;
234 for (channel = s->
min_channel; channel <= s->max_channel; channel++) {
238 int lsb_bits = cp->
huff_lsbs - quant_step_size;
242 result =
get_vlc2(gbp, huff_vlc[codebook-1].table,
249 result = (result << lsb_bits) +
get_bits(gbp, lsb_bits);
252 result <<= quant_step_size;
296 "Channel group 2 cannot have more bits per sample than group 1.\n");
302 "Channel groups with differing sample rates are not currently supported.\n");
312 "Sampling rate %d is greater than the supported maximum (%d).\n",
318 "Block size %d is greater than the supported maximum (%d).\n",
324 "Block size pow2 %d is greater than the supported maximum (%d).\n",
337 "Number of substreams %d is larger than the maximum supported "
387 const uint8_t *buf,
unsigned int substr)
395 int min_channel, max_channel, max_matrix_channel;
402 if (sync_word != 0x31ea >> 1) {
404 "restart header sync incorrect (got 0x%04x)\n", sync_word);
419 max_matrix_channel =
get_bits(gbp, 4);
421 if (max_matrix_channel > std_max_matrix_channel) {
423 "Max matrix channel cannot be greater than %d.\n",
428 if (max_channel != max_matrix_channel) {
430 "Max channel must be equal max matrix channel.\n");
438 "Number of channels %d is larger than the maximum supported "
443 if (min_channel > max_channel) {
445 "Substream min channel cannot be greater than max channel.\n");
454 if (m->
avctx->request_channels > 0 &&
458 "Extracting %d channel downmix from substream %d. "
459 "Further substreams will be skipped.\n",
474 if (tmp != lossless_check)
476 "Lossless check failed - expected %02x, calculated %02x.\n",
477 lossless_check, tmp);
494 "Assignment of matrix channel %d to invalid output channel %d.\n",
515 for (ch = s->
min_channel; ch <= s->max_channel; ch++) {
540 unsigned int substr,
unsigned int channel,
546 const char fchar = filter ?
'I' :
'F';
558 if (order > max_order) {
560 "%cIR filter order %d is greater than maximum %d.\n",
561 fchar, order, max_order);
568 int coeff_bits, coeff_shift;
574 if (coeff_bits < 1 || coeff_bits > 16) {
576 "%cIR filter coeff_bits must be between 1 and 16.\n",
580 if (coeff_bits + coeff_shift > 16) {
582 "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n",
587 for (i = 0; i < order; i++)
588 fcoeff[i] =
get_sbits(gbp, coeff_bits) << coeff_shift;
591 int state_bits, state_shift;
595 "FIR filter has state data specified.\n");
604 for (i = 0; i < order; i++)
617 unsigned int mat, ch;
631 "Number of primitive matrices cannot be greater than %d.\n",
632 max_primitive_matrices);
637 int frac_bits, max_chan;
644 "Invalid channel %d specified as output from matrix.\n",
648 if (frac_bits > 14) {
650 "Too many fractional bits specified.\n");
658 for (ch = 0; ch <= max_chan; ch++) {
661 coeff_val =
get_sbits(gbp, frac_bits + 2);
663 s->
matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits);
704 "FIR and IIR filters must use the same precision.\n");
776 for (ch = s->
min_channel; ch <= s->max_channel; ch++)
784 #define MSB_MASK(bits) (-1u << bits)
790 unsigned int channel)
799 unsigned int filter_shift = fir->
shift;
820 unsigned int i, ch, expected_stream_pos = 0;
825 expected_stream_pos +=
get_bits(gbp, 16);
827 "we have not tested yet.\n");
842 for (ch = s->
min_channel; ch <= s->max_channel; ch++)
859 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2,
860 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62,
861 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5,
862 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40,
863 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34,
864 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30,
865 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36,
866 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69,
867 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24,
868 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20,
869 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23,
870 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8,
871 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40,
872 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37,
873 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52,
874 -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70,
895 uint16_t seed_shr7 = seed >> 7;
899 seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5);
914 uint8_t seed_shr15 = seed >> 15;
916 seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5);
929 unsigned int mat, src_ch, i;
930 unsigned int maxchan;
946 int index2 = 2 * index + 1;
955 for (src_ch = 0; src_ch <= maxchan; src_ch++)
956 accum += (int64_t) samples[src_ch] * coeffs[src_ch];
958 if (matrix_noise_shift) {
964 samples[dest_ch] = ((accum >> 14) & mask) + bypassed_lsb;
972 void *
data,
int *got_frame_ptr)
976 unsigned int i, out_ch = 0;
1001 for (i = 0; i < s->
blockpos; i++) {
1007 if (is32) *data_32++ = sample << 8;
1008 else *data_16++ = sample >> 8;
1023 int *got_frame_ptr,
AVPacket *avpkt)
1026 int buf_size = avpkt->
size;
1029 unsigned int length, substr;
1030 unsigned int substream_start;
1031 unsigned int header_size = 4;
1032 unsigned int substr_header_size = 0;
1041 length = (
AV_RB16(buf) & 0xfff) * 2;
1043 if (length < 4 || length > buf_size)
1058 "Stream parameters not seen; skipping frame.\n");
1063 substream_start = 0;
1066 int extraword_present, checkdata_present, end, nonrestart_substr;
1075 substr_header_size += 2;
1077 if (extraword_present) {
1083 substr_header_size += 2;
1091 if (end + header_size + substr_header_size > length) {
1093 "Indicated length of substream %d data goes off end of "
1094 "packet.\n", substr);
1095 end = length - header_size - substr_header_size;
1098 if (end < substream_start) {
1100 "Indicated end offset of substream %d data "
1101 "is smaller than calculated start offset.\n",
1109 substream_parity_present[substr] = checkdata_present;
1110 substream_data_len[substr] = end - substream_start;
1111 substream_start = end;
1117 if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
1122 buf += header_size + substr_header_size;
1154 goto substream_length_mismatch;
1160 if (substream_data_len[substr] * 8 -
get_bits_count(&gb) >= 32) {
1176 if (substream_parity_present[substr]) {
1180 goto substream_length_mismatch;
1185 if ((
get_bits(&gb, 8) ^ parity) != 0xa9 )
1192 goto substream_length_mismatch;
1197 "No restart header present in substream %d.\n", substr);
1199 buf += substream_data_len[substr];
1209 substream_length_mismatch:
1229 #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]
struct SubStream SubStream
FilterParams filter_params[NUM_FILTERS]
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. ...
This structure describes decoded (raw) audio or video data.
#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.
AVFrame * coded_frame
the picture in the bitstream
#define AV_CH_TOP_FRONT_LEFT
#define AV_CH_TOP_FRONT_CENTER
#define AV_CH_LOW_FREQUENCY_2
struct MLPDecodeContext MLPDecodeContext
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
#define MAX_SAMPLERATE
maximum sample frequency seen in files
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)
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
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 init(AVCodecParserContext *s)
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.
ChannelParams channel_params[MAX_CHANNELS]
Channel coding parameters for channels in the substream.
#define MAX_MATRIX_CHANNEL_TRUEHD
void av_log_ask_for_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message asking for a sample.
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. ...
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)
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.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame)
Get a buffer for a frame.
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
static int output_data(MLPDecodeContext *m, unsigned int substr, void *data, int *got_frame_ptr)
Write the audio data into the output buffer.
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.
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
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
#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.
int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS]
static unsigned int get_bits1(GetBitContext *s)
static void skip_bits1(GetBitContext *s)
void avcodec_get_frame_defaults(AVFrame *frame)
Set the fields of the given AVFrame to default values.
static void skip_bits(GetBitContext *s, int n)
#define FF_ARRAY_ELEMS(a)
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).
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 AVERROR_INVALIDDATA
#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...
#define AVERROR_PATCHWELCOME
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 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...
void ff_mlpdsp_init(MLPDSPContext *c)
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
if(!(ptr_align%ac->ptr_align)&&samples_align >=aligned_len)
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...