Go to the documentation of this file.
31 #define HCA_MASK 0x7f7f7f7f
32 #define MAX_CHANNELS 16
75 const int mul = ((
key & 1) << 3) | 5;
76 const int add = (
key & 0xE) | 1;
79 for (
int i = 0;
i < 16;
i++) {
80 key = (
key * mul + add) & 0xF;
87 uint8_t
base[256], base_r[16], base_c[16], kc[8],
seed[16];
95 for (
int r = 0;
r < (8-1);
r++) {
96 kc[
r] = keycode & 0xFF;
97 keycode = keycode >> 8;
102 seed[ 1] = kc[1] ^ kc[6];
103 seed[ 2] = kc[2] ^ kc[3];
105 seed[ 4] = kc[2] ^ kc[1];
106 seed[ 5] = kc[3] ^ kc[4];
108 seed[ 7] = kc[3] ^ kc[2];
109 seed[ 8] = kc[4] ^ kc[5];
111 seed[10] = kc[4] ^ kc[3];
112 seed[11] = kc[5] ^ kc[6];
114 seed[13] = kc[5] ^ kc[4];
115 seed[14] = kc[6] ^ kc[1];
120 for (
int r = 0;
r < 16;
r++) {
124 for (
int c = 0;
c < 16;
c++)
125 base[
r*16 +
c] = nb | base_c[
c];
133 for (
int i = 0;
i < 256;
i++) {
135 if (
base[x] != 0 &&
base[x] != 0xFF)
149 keycode = keycode * (((uint64_t)subkey<<16
u)|((uint16_t)~subkey+2
u));
154 for (
int i = 0;
i < 256;
i++)
163 unsigned int acc = 0;
165 for (
int i = 0;
i < 128;
i++) {
170 memset(
ath+
i, 0xFF, (128 -
i));
194 static inline unsigned ceil2(
unsigned a,
unsigned b)
196 return (
b > 0) ? (
a /
b + ((
a %
b) ? 1 : 0)) : 0;
200 const int extradata_size)
204 int8_t
r[16] = { 0 };
208 if (extradata_size < 36)
214 version = bytestream2_get_be16(gb);
217 c->ath_type =
version >= 0x200 ? 0 : 1;
219 if ((bytestream2_get_be32u(gb) &
HCA_MASK) !=
MKBETAG(
'f',
'm',
't', 0))
225 chunk = bytestream2_get_be32u(gb) &
HCA_MASK;
226 if (chunk ==
MKBETAG(
'c',
'o',
'm',
'p')) {
230 c->track_count = bytestream2_get_byteu(gb);
231 c->channel_config = bytestream2_get_byteu(gb);
232 c->total_band_count = bytestream2_get_byteu(gb);
233 c->base_band_count = bytestream2_get_byteu(gb);
234 c->stereo_band_count = bytestream2_get_byte (gb);
235 c->bands_per_hfr_group = bytestream2_get_byte (gb);
236 }
else if (chunk ==
MKBETAG(
'd',
'e',
'c', 0)) {
240 c->total_band_count = bytestream2_get_byteu(gb) + 1;
241 c->base_band_count = bytestream2_get_byteu(gb) + 1;
242 c->track_count = bytestream2_peek_byteu(gb) >> 4;
243 c->channel_config = bytestream2_get_byteu(gb) & 0xF;
244 if (!bytestream2_get_byteu(gb))
245 c->base_band_count =
c->total_band_count;
246 c->stereo_band_count =
c->total_band_count -
c->base_band_count;
247 c->bands_per_hfr_group = 0;
255 chunk = bytestream2_get_be32u(gb) &
HCA_MASK;
256 if (chunk ==
MKBETAG(
'v',
'b',
'r', 0)) {
258 }
else if (chunk ==
MKBETAG(
'a',
't',
'h', 0)) {
259 c->ath_type = bytestream2_get_be16(gb);
260 }
else if (chunk ==
MKBETAG(
'r',
'v',
'a', 0)) {
262 }
else if (chunk ==
MKBETAG(
'c',
'o',
'm',
'm')) {
264 }
else if (chunk ==
MKBETAG(
'c',
'i',
'p',
'h')) {
265 c->ciph_type = bytestream2_get_be16(gb);
266 }
else if (chunk ==
MKBETAG(
'l',
'o',
'o',
'p')) {
268 }
else if (chunk ==
MKBETAG(
'p',
'a',
'd', 0)) {
277 c->key = bytestream2_get_be64u(gb);
278 c->subkey = bytestream2_get_be16u(gb);
291 if (
c->stereo_band_count &&
b > 1) {
294 for (
int i = 0;
i <
c->track_count;
i++, x+=
b) {
303 if (
c->channel_config == 0) {
310 if (
c->channel_config <= 2) {
317 x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2;
320 x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2; x[6] = 1; x[7] = 2;
326 if (
c->total_band_count <
c->base_band_count)
329 c->hfr_group_count =
ceil2(
c->total_band_count - (
c->base_band_count +
c->stereo_band_count),
330 c->bands_per_hfr_group);
332 if (
c->base_band_count +
c->stereo_band_count + (
unsigned long)
c->hfr_group_count > 128ULL)
336 c->ch[
i].chan_type =
r[
i];
337 c->ch[
i].count =
c->base_band_count + ((
r[
i] != 2) ?
c->stereo_band_count : 0);
338 c->ch[
i].hfr_scale = &
c->ch[
i].scale_factors[
c->base_band_count +
c->stereo_band_count];
339 if (
c->ch[
i].count > 128)
349 float scale = 1.f / 8.f;
386 int index,
unsigned band_count,
unsigned base_band_count,
387 unsigned stereo_band_count)
390 float ratio_r = ratio_l - 2.0f;
394 if (ch1->
chan_type != 1 || !stereo_band_count)
397 for (
int i = 0;
i < band_count;
i++) {
404 unsigned hfr_group_count,
405 unsigned bands_per_hfr_group,
406 unsigned start_band,
unsigned total_band_count)
408 if (ch->
chan_type == 2 || !bands_per_hfr_group)
411 for (
int i = 0, k = start_band, l = start_band - 1;
i < hfr_group_count;
i++){
412 for (
int j = 0; j < bands_per_hfr_group && k < total_band_count && l >= 0; j++, k++, l--){
428 for (
int i = 0;
i < ch->
count;
i++) {
447 memset(factors + ch->
count, 0, 512 - ch->
count *
sizeof(*factors));
448 c->fdsp->vector_fmul(
out, factors,
base, 128);
453 unsigned hfr_group_count,
454 int packed_noise_level,
459 if (delta_bits > 5) {
462 }
else if (delta_bits) {
464 int max_value = (1 << delta_bits) - 1;
465 int half_max = max_value >> 1;
468 for (
int i = 1;
i < ch->
count;
i++){
471 if (
delta == max_value) {
487 for (
int i = 1;
i < 8;
i++)
491 for (
int i = 0;
i < hfr_group_count;
i++)
495 for (
int i = 0;
i < ch->
count;
i++) {
499 scale =
c->ath[
i] + ((packed_noise_level +
i) >> 8) - ((
scale * 5) >> 1) + 2;
512 int *got_frame_ptr,
AVPacket *avpkt)
515 int ch,
offset = 0,
ret, packed_noise_level;
519 if (avpkt->
size <= 8)
537 if (
c->key ||
c->subkey) {
538 uint8_t *
data, *cipher =
c->cipher;
543 for (
int n = 0; n < avpkt->
size; n++)
558 frame->nb_samples = 1024;
566 unpack(
c, &
c->ch[ch], gb,
c->hfr_group_count, packed_noise_level,
c->ath);
568 for (
int i = 0;
i < 8;
i++) {
573 c->stereo_band_count +
c->base_band_count,
c->total_band_count);
576 c->total_band_count -
c->base_band_count,
577 c->base_band_count,
c->stereo_band_count);
@ AV_SAMPLE_FMT_FLTP
float, planar
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
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
int sample_rate
samples per second
#define u(width, name, range_min, range_max)
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
static av_always_inline void bytestream2_skipu(GetByteContext *g, unsigned int size)
This structure describes decoded (raw) audio or video data.
static int init_hca(AVCodecContext *avctx, const uint8_t *extradata, const int extradata_size)
ChannelContext ch[MAX_CHANNELS]
int nb_channels
Number of channels in this layout.
static void apply_intensity_stereo(HCAContext *s, ChannelContext *ch1, ChannelContext *ch2, int index, unsigned band_count, unsigned base_band_count, unsigned stereo_band_count)
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration (i)MDCTs with an odd length are currently...
static void cipher_init56(uint8_t *cipher, uint64_t keycode)
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
static SDL_Window * window
AVCodec p
The public AVCodec.
AVChannelLayout ch_layout
Audio channel layout.
int flags
AV_CODEC_FLAG_*.
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 type
static av_always_inline float scale(float x, float s)
uint8_t bands_per_hfr_group
#define FF_ARRAY_ELEMS(a)
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
static void unpack(HCAContext *c, ChannelContext *ch, GetBitContext *gb, unsigned hfr_group_count, int packed_noise_level, const uint8_t *ath)
static void ath_init1(uint8_t *ath, int sample_rate)
@ AV_TX_FLOAT_MDCT
Standard MDCT with a sample data type of float, double or int32_t, respecively.
#define FF_CODEC_DECODE_CB(func)
static const float scale_conversion_table[]
int(* init)(AVBSFContext *ctx)
static const uint8_t quant_spectrum_bits[]
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
static av_cold float ath(float f, float add)
Calculate ATH value for given frequency.
static const int8_t quant_spectrum_value[]
#define CODEC_LONG_NAME(str)
static void dequantize_coefficients(HCAContext *c, ChannelContext *ch, GetBitContext *gb)
static av_cold int decode_init(AVCodecContext *avctx)
static const float quant_step_size[]
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
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
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
static int ath_init(uint8_t *ath, int type, int sample_rate)
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
static const float dequantizer_scaling_table[]
#define DECLARE_ALIGNED(n, t, v)
uint8_t stereo_band_count
static const uint8_t scale_table[]
enum AVSampleFormat sample_fmt
audio sample format
const FFCodec ff_hca_decoder
#define MKBETAG(a, b, c, d)
static void reconstruct_hfr(HCAContext *s, ChannelContext *ch, unsigned hfr_group_count, unsigned bands_per_hfr_group, unsigned start_band, unsigned total_band_count)
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
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
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets *ctx to NULL, does nothing when *ctx == NULL.
static av_cold int decode_close(AVCodecContext *avctx)
#define i(width, name, range_min, range_max)
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
AVSampleFormat
Audio sample formats.
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 default value
static const uint8_t ath_base_curve[656]
const char * name
Name of the codec implementation.
static const uint8_t max_bits_table[]
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 unsigned ceil2(unsigned a, unsigned b)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
main external API structure.
static void cipher_init(uint8_t *cipher, int type, uint64_t keycode, uint16_t subkey)
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
int av_packet_make_writable(AVPacket *pkt)
Create a writable reference for the data described by a given packet, avoiding data copy if possible.
Filter the word “frame” indicates either a video frame or a group of audio samples
int8_t scale_factors[128]
static const int factor[16]
static void cipher_init56_create_table(uint8_t *r, uint8_t key)
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
static const float intensity_ratio_table[]
This structure stores compressed data.
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define MKTAG(a, b, c, d)
static const int scale_conv_bias
static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16