30 return (v >> 1) ^ -(v & 1);
42 return (v >> 1) ^ -(v & 1);
49 for (i = 0; i <
size; i++)
58 memset(array, 0,
sizeof(*array) * size);
59 else for (i = 0; i <
size; i++)
67 for (i = 0; i <
size; i++)
77 for (i = 0; i < m; i++) {
78 int code, sign,
coeff, scale, scale_inv = 0;
84 sign = (code >> 8) - 1;
99 sign = (code >> 8) - 1;
108 coeff =
mul16(scale_inv, coeff);
109 *coeff_ptr++ = (coeff ^ sign) - sign;
158 if (c->
freq > 192000) {
243 if (c->
freq > 96000) {
278 for (band = 0, b = c->
bands; band < c->nfreqbands; band++, b++) {
411 int i, j, nsamples = 0;
458 for (i = 0; i < k; i++) {
473 for (i = 0; i < k; i++) {
537 memset(part_b, 0,
sizeof(*part_b) * nsamples_part_b);
540 for (j = 0; j < nisosamples; j++) {
542 if (loc >= nsamples_part_b) {
550 for (j = 0; j < nsamples_part_b; j++) {
565 if (seg == 0 && band == 1) {
618 if (seg <= 0 && band)
640 for (j = 0; j < order; j++) {
642 for (k = 0; k < (j + 1) / 2; k++) {
643 int tmp1 = coeff[ k ];
644 int tmp2 = coeff[j - k - 1];
645 coeff[ k ] = tmp1 +
mul16(rc, tmp2);
646 coeff[j - k - 1] = tmp2 +
mul16(rc, tmp1);
651 for (j = 0; j < nsamples - order; j++) {
653 for (k = 0; k < order; k++)
654 err += (int64_t)buf[j + k] * coeff[order - k - 1];
660 for (k = 1; k < nsamples; k++)
661 buf[k] += (
unsigned)buf[k - 1];
699 else if (shift && adj)
719 for (n = 0; n < nsamples; n++)
720 msb[n] = msb[n] * (
SUINT)(1 <<
shift) + (lsb[n] << adj);
722 for (n = 0; n < nsamples; n++)
767 int stream_ver, header_size, frame_size_nbits, nframesegs_log2;
777 if (stream_ver > 1) {
880 while (++c < &s->chset[s->
nchsets])
913 for (i = 0, c = s->
chset; i < s->nchsets; i++, c++) {
926 for (i = s->
nchsets - 1, c = &s->
chset[i]; i > 0; i--, c--) {
953 int chs, seg, band, navi_nb, navi_pos, *navi_ptr;
958 if (navi_nb > 1024) {
971 for (band = 0; band < s->
nfreqbands; band++) {
973 for (chs = 0, c = s->
chset; chs < s->nchsets; chs++, c++) {
1004 int ret, chs, seg, band, navi_pos, *navi_ptr;
1007 for (chs = 0, c = s->
chset; chs < s->nactivechsets; chs++, c++) {
1016 for (band = 0; band < s->
nfreqbands; band++) {
1018 for (chs = 0, c = s->
chset; chs < s->nchsets; chs++, c++) {
1020 navi_pos += *navi_ptr * 8;
1025 if (chs < s->nactivechsets &&
1180 int i, j, k, nchannels = 0, *coeff_ptr = o->
dmix_coeff;
1183 for (i = 0, c = s->
chset; i < s->nactivechsets; i++, c++) {
1190 int coeff = *coeff_ptr++;
1211 int i, j, nchannels = 0;
1214 for (i = 0, c = s->
chset; i < s->nactivechsets; i++, c++) {
1221 if (scale != (1 << 15)) {
1303 round = shift > 0 ? 1 << (shift - 1) : 0;
1310 for (n = 0; n < nsamples; n++)
1314 for (n = 0; n < nsamples; n++)
1315 dst[n] += (
unsigned)((src[n] +
round) >> shift);
1329 int i, j, k,
ret,
shift, nsamples, request_mask;
1334 for (i = 0,
c = s->
chset; i < s->nchsets; i++,
c++) {
1335 if (i < s->nactivechsets)
1338 if (!
c->primary_chset)
1339 c->dmix_embedded = 0;
1348 for (i = 0,
c = s->
chset; i < s->nactivechsets; i++,
c++) {
1351 if (
c->residual_encode != (1 <<
c->nchannels) - 1
1358 if (
c->nfreqbands > 1) {
1367 for (i = 1,
c = &s->
chset[1]; i < s->nchsets; i++,
c++) {
1372 for (j = 0; j <
c->nfreqbands; j++)
1373 if (
c->bands[j].dmix_embedded)
1378 for (j = 0; j <
c->nfreqbands; j++)
1379 if (
c->bands[j].dmix_embedded)
1444 for (i = 0; i < avctx->
channels; i++) {
1448 for (k = 0; k < nsamples; k++)
1452 for (k = 0; k < nsamples; k++)
int adapt_pred_order[DCA_XLL_CHANNELS_MAX]
Adaptive predictor order.
int frame_size
Number of bytes in a lossless frame.
static int combine_residual_frame(DCAXllDecoder *s, DCAXllChSet *c)
static int ff_dca_seek_bits(GetBitContext *s, int p)
DCACoreDecoder core
Core decoder context.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static int shift(int a, int b)
#define DCA_XLL_CHSETS_MAX
This structure describes decoded (raw) audio or video data.
int primary_chset
Primary channel set flag.
ptrdiff_t const GLvoid * data
int pbr_delay
Delay in frames before decoding buffered data.
static int chs_alloc_msb_band_data(DCAXllDecoder *s, DCAXllChSet *c)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
#define AV_LOG_WARNING
Something somehow does not look correct.
int64_t bit_rate
the average bitrate
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
int nchannels
Number of channels in the channel set (N)
#define DCA_PACKET_RECOVERY
Sync error recovery flag.
#define avpriv_request_sample(...)
#define DCA_XLL_PBR_BUFFER_MAX
int pbr_length
Length in bytes of data currently buffered.
static av_cold void chs_clear_band_data(DCAXllDecoder *s, DCAXllChSet *c, int band, int seg)
static int32_t mul15(int32_t a, int32_t b)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
int freq
Original sampling frequency (max. 96000 Hz)
int dmix_scale[DCA_XLL_DMIX_SCALES_MAX]
Downmixing scales.
static int get_sbits_long(GetBitContext *s, int n)
Read 0-32 bits as a signed integer.
int bitalloc_part_a[DCA_XLL_CHANNELS_MAX]
Coding parameter for part A of segment.
static void chs_filter_band_data(DCAXllDecoder *s, DCAXllChSet *c, int band)
DCAXllBand bands[DCA_XLL_BANDS_MAX]
Frequency bands.
static int32_t norm16(int64_t a)
int rice_code_flag[DCA_XLL_CHANNELS_MAX]
Rice coding flag.
int band_crc_present
Presence of CRC16 within each frequency band.
int highest_pred_order
Highest adaptive predictor order.
int32_t * sample_buffer[DCA_XLL_SAMPLE_BUFFERS_MAX]
static int32_t clip23(int32_t a)
static int get_rice(GetBitContext *gb, int k)
void(* decor)(int32_t *dst, const int32_t *src, int coeff, ptrdiff_t len)
enum AVSampleFormat sample_fmt
audio sample format
static int32_t mul16(int32_t a, int32_t b)
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
#define FF_DCA_DMIXTABLE_OFFSET
int dmix_coeffs_present
Downmix coefficients present in stream.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int nfreqbands
Highest number of frequency bands.
#define DCA_XLL_SAMPLE_BUFFERS_MAX
int ch_remap[DCA_XLL_CHANNELS_MAX]
Channel to speaker map.
static void get_rice_array(GetBitContext *gb, int32_t *array, int size, int k)
int fixed_lsb_width
Fixed LSB width.
static int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s, int p1, int p2)
int fixed_pred_order[DCA_XLL_CHANNELS_MAX]
Fixed predictor order.
int nfreqbands
Number of frequency bands (1 or 2)
static int get_bits_count(const GetBitContext *s)
static void get_linear_array(GetBitContext *gb, int32_t *array, int size, int n)
#define AV_LOG_VERBOSE
Detailed information.
int32_t * lsb_sample_buffer[DCA_XLL_CHANNELS_MAX]
LSB sample buffer pointers or NULL.
static int chs_parse_header(DCAXllDecoder *s, DCAXllChSet *c, DCAExssAsset *asset)
DCAExssParser exss
EXSS parser context.
static av_cold void force_lossy_output(DCAXllDecoder *s, DCAXllChSet *c)
static int parse_band_data(DCAXllDecoder *s)
void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples, int *coeff_l, int nsamples, int ch_mask)
int hd_stream_id
DTS-HD stream ID.
int npcmsamples
Number of PCM samples per channel.
int adapt_refl_coeff[DCA_XLL_CHANNELS_MAX][DCA_XLL_ADAPT_PRED_ORDER_MAX]
Adaptive predictor reflection coefficients.
static int get_bits_left(GetBitContext *gb)
int orig_order[DCA_XLL_CHANNELS_MAX]
Original channel order.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
int ff_dca_xll_filter_frame(DCAXllDecoder *s, AVFrame *frame)
int representation_type
Representation type.
static int get_linear(GetBitContext *gb, int n)
static DCAXllChSet * find_next_hier_dmix_chset(DCAXllDecoder *s, DCAXllChSet *c)
int scalable_lsbs
MSB/LSB split flag.
const uint16_t ff_dca_dmixtable[FF_DCA_DMIXTABLE_SIZE]
int nsegsamples_log2
log2(nsegsamples)
static int parse_sub_headers(DCAXllDecoder *s, DCAExssAsset *asset)
const uint32_t ff_dca_sampling_freqs[16]
int pcm_bit_res
PCM bit resolution (variable)
static av_always_inline av_const double round(double x)
int hier_chset
Whether the channel set is part of a hierarchy.
static void prescale_down_mix(DCAXllChSet *c, DCAXllChSet *o)
#define DCA_SPEAKER_LAYOUT_STEREO
void(* dmix_sub)(int32_t *dst, const int32_t *src, int coeff, ptrdiff_t len)
int32_t * output_samples[DCA_SPEAKER_COUNT]
int decor_enabled
Pairwise channel decorrelation flag.
int hier_ofs
Number of preceding channels in a hierarchy (M)
int nchannels
Total number of channels in a hierarchy.
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
int seg_size_nbits
Number of bits used to read segment size.
int output_rate
Output sample rate (1x or 2x header rate)
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
static int chs_parse_band_data(DCAXllDecoder *s, DCAXllChSet *c, int band, int seg, int band_data_end)
int dmix_type
Primary channel set downmix type.
const int32_t ff_dca_xll_band_coeff[20]
int xll_offset
Offset to XLL data from start of substream.
static int ff_dca_core_map_spkr(DCACoreDecoder *core, int spkr)
int nframesamples
Samples in frame per one frequency band.
int nabits
Number of bits to read bit allocation coding parameter.
const uint8_t ff_dca_dmix_primary_nch[8]
const uint16_t ff_dca_xll_refl_coeff[128]
#define DCA_HAS_STEREO(mask)
#define DCA_XLL_ADAPT_PRED_ORDER_MAX
int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask)
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
static int get_rice_un(GetBitContext *gb, int k)
int nsegsamples
Samples in segment per one frequency band.
#define AV_EF_EXPLODE
abort decoding on minor error detection
int xll_delay_nframes
Initial XLL decoding delay in frames.
DCAExssAsset assets[1]
Audio asset descriptors.
int xll_size
Size of XLL data in extension substream.
const uint32_t ff_dca_inv_dmixtable[FF_DCA_INV_DMIXTABLE_SIZE]
int dmix_scale_inv[DCA_XLL_DMIX_SCALES_MAX]
Inverse downmixing scales.
int one_to_one_map_ch_to_spkr
One to one channel to speaker mapping flag.
int ff_side_data_update_matrix_encoding(AVFrame *frame, enum AVMatrixEncoding matrix_encoding)
Add or update AV_FRAME_DATA_MATRIXENCODING side data.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
static int parse_frame_no_pbr(DCAXllDecoder *s, uint8_t *data, int size, DCAExssAsset *asset)
int residual_encode
Residual encoding mask (0 - residual, 1 - full channel)
static void scale_down_mix(DCAXllDecoder *s, DCAXllChSet *o, int band)
static void get_array(GetBitContext *gb, int32_t *array, int size, int n)
int bitalloc_hybrid_linear[DCA_XLL_CHANNELS_MAX]
Binary code length for isolated samples.
int sample_rate
samples per second
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
int hd_stream_id
Previous DTS-HD stream ID for detecting changes.
main external API structure.
int lsb_section_size
Size of LSB section in any segment.
#define FF_DCA_INV_DMIXTABLE_SIZE
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
unsigned int sample_size[DCA_XLL_SAMPLE_BUFFERS_MAX]
static unsigned int get_bits1(GetBitContext *s)
static void skip_bits(GetBitContext *s, int n)
static int parse_frame_pbr(DCAXllDecoder *s, uint8_t *data, int size, DCAExssAsset *asset)
int nreschsets
Number of channel sets that have residual encoded channels.
#define DCA_SPEAKER_LAYOUT_5POINT1
int nframesegs
Number of segments per frame.
int32_t * output_samples[DCA_SPEAKER_COUNT]
PCM output for fixed point mode.
static int parse_navi_table(DCAXllDecoder *s)
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
static int chs_get_lsb_width(DCAXllDecoder *s, DCAXllChSet *c, int band, int ch)
#define DCA_SPEAKER_LAYOUT_5POINT0
int ch_mask
Channel mask for set.
int32_t * msb_sample_buffer[DCA_XLL_CHANNELS_MAX]
MSB sample buffer pointers.
static int is_hier_dmix_chset(DCAXllChSet *c)
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
int nsamples_part_a[DCA_XLL_CHANNELS_MAX]
Number of samples in part A of segment.
static int parse_dmix_coeffs(DCAXllDecoder *s, DCAXllChSet *c)
#define DCA_XLL_DECI_HISTORY_MAX
void(* dmix_scale)(int32_t *dst, int scale, ptrdiff_t len)
static void chs_assemble_msbs_lsbs(DCAXllDecoder *s, DCAXllChSet *c, int band)
static void undo_down_mix(DCAXllDecoder *s, DCAXllChSet *o, int band)
av_cold void ff_dca_xll_flush(DCAXllDecoder *s)
static int parse_common_header(DCAXllDecoder *s)
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
int dmix_embedded
Downmix already performed by encoder.
static void clear_pbr(DCAXllDecoder *s)
int dmix_coeff[DCA_XLL_DMIX_COEFFS_MAX]
Downmixing coefficients.
int xll_sync_present
XLL sync word present flag.
int storage_bit_res
Storage bit resolution (16 or 24)
DCAXllChSet chset[DCA_XLL_CHSETS_MAX]
Channel sets.
int request_channel_layout
Converted from avctx.request_channel_layout.
static int chs_assemble_freq_bands(DCAXllDecoder *s, DCAXllChSet *c)
int32_t deci_history[DCA_XLL_CHANNELS_MAX][DCA_XLL_DECI_HISTORY_MAX]
Decimator history for frequency band 1.
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
#define FF_DCA_DMIXTABLE_SIZE
av_cold void ff_dca_xll_close(DCAXllDecoder *s)
uint8_t * pbr_buffer
Peak bit rate (PBR) smoothing buffer.
int channels
number of audio channels
int seg_common
Segment type.
void(* assemble_freq_bands)(int32_t *dst, int32_t *src0, int32_t *src1, const int32_t *coeff, ptrdiff_t len)
static const double coeff[2][5]
static int chs_alloc_lsb_band_data(DCAXllDecoder *s, DCAXllChSet *c)
int ch_mask_nbits
Number of bits used to read channel mask.
#define DCA_XLL_CHANNELS_MAX
int ff_dca_xll_parse(DCAXllDecoder *s, uint8_t *data, DCAExssAsset *asset)
int bit_width_adjust[DCA_XLL_CHANNELS_MAX]
Number of bits discarded by authoring.
Filter the word “frame” indicates either a video frame or a group of audio samples
int nframesamples_log2
log2(nframesamples)
static int array[MAX_W *MAX_W]
int nscalablelsbs[DCA_XLL_CHANNELS_MAX]
Number of bits to represent the samples in LSB part.
#define FF_PROFILE_DTS_HD_MA
static int copy_to_pbr(DCAXllDecoder *s, uint8_t *data, int size, int delay)
static int parse_frame(DCAXllDecoder *s, uint8_t *data, int size, DCAExssAsset *asset)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
uint8_t ** extended_data
pointers to the data planes/channels.
int xll_sync_offset
Number of bytes offset to XLL sync.
int nchsets
Number of channels sets per frame.
int dmix_embedded
Downmix performed by encoder in frequency band.
int decor_coeff[DCA_XLL_CHANNELS_MAX/2]
Pairwise channel coefficients.
int nb_samples
number of audio samples (per channel) described by this frame
int nactivechsets
Number of active channel sets to decode.
int bitalloc_part_b[DCA_XLL_CHANNELS_MAX]
Coding parameter for part B of segment.