* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+
+/**
+ * @file ac3enc.c
+ * The simplest AC3 encoder.
+ */
//#define DEBUG
//#define DEBUG_BITALLOC
#include "avcodec.h"
int nb_all_channels;
int lfe_channel;
int bit_rate;
- int sample_rate;
- int bsid;
- int frame_size_min; /* minimum frame size in case rounding is necessary */
- int frame_size; /* current frame size in words */
+ unsigned int sample_rate;
+ unsigned int bsid;
+ unsigned int frame_size_min; /* minimum frame size in case rounding is necessary */
+ unsigned int frame_size; /* current frame size in words */
int halfratecod;
- int frmsizecod;
- int fscod; /* frequency */
- int acmod;
+ unsigned int frmsizecod;
+ unsigned int fscod; /* frequency */
+ unsigned int acmod;
int lfe;
- int bsmod;
+ unsigned int bsmod;
short last_samples[AC3_MAX_CHANNELS][256];
- int chbwcod[AC3_MAX_CHANNELS];
+ unsigned int chbwcod[AC3_MAX_CHANNELS];
int nb_coefs[AC3_MAX_CHANNELS];
/* bitrate allocation control */
static void fft_init(int ln);
static void ac3_crc_init(void);
-static inline INT16 fix15(float a)
+static inline int16_t fix15(float a)
{
int v;
v = (int)(a * (float)(1 << 15));
/* AC3 bit allocation. The algorithm is the one described in the AC3
spec. */
-void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, UINT8 *bap,
- INT8 *exp, int start, int end,
+void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
+ int8_t *exp, int start, int end,
int snroffset, int fgain, int is_lfe,
int deltbae,int deltnseg,
- UINT8 *deltoffst, UINT8 *deltlen, UINT8 *deltba)
+ uint8_t *deltoffst, uint8_t *deltlen, uint8_t *deltba)
{
int bin,i,j,k,end1,v,v1,bndstrt,bndend,lowcomp,begin;
int fastleak,slowleak,address,tmp;
- INT16 psd[256]; /* scaled exponents */
- INT16 bndpsd[50]; /* interpolated exponents */
- INT16 excite[50]; /* excitation */
- INT16 mask[50]; /* masking value */
+ int16_t psd[256]; /* scaled exponents */
+ int16_t bndpsd[50]; /* interpolated exponents */
+ int16_t excite[50]; /* excitation */
+ int16_t mask[50]; /* masking value */
/* exponent mapping to PSD */
for(bin=start;bin<end;bin++) {
}
/* do a 512 point mdct */
-static void mdct512(INT32 *out, INT16 *in)
+static void mdct512(int32_t *out, int16_t *in)
{
int i, re, im, re1, im1;
- INT16 rot[N];
+ int16_t rot[N];
IComplex x[N/4];
/* shift to simplify computations */
}
/* XXX: use another norm ? */
-static int calc_exp_diff(UINT8 *exp1, UINT8 *exp2, int n)
+static int calc_exp_diff(uint8_t *exp1, uint8_t *exp2, int n)
{
int sum, i;
sum = 0;
return sum;
}
-static void compute_exp_strategy(UINT8 exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
- UINT8 exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
+static void compute_exp_strategy(uint8_t exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
+ uint8_t exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
int ch, int is_lfe)
{
int i, j;
}
/* set exp[i] to min(exp[i], exp1[i]) */
-static void exponent_min(UINT8 exp[N/2], UINT8 exp1[N/2], int n)
+static void exponent_min(uint8_t exp[N/2], uint8_t exp1[N/2], int n)
{
int i;
/* update the exponents so that they are the ones the decoder will
decode. Return the number of bits used to code the exponents */
-static int encode_exp(UINT8 encoded_exp[N/2],
- UINT8 exp[N/2],
+static int encode_exp(uint8_t encoded_exp[N/2],
+ uint8_t exp[N/2],
int nb_exps,
int exp_strategy)
{
int group_size, nb_groups, i, j, k, recurse, exp_min, delta;
- UINT8 exp1[N/2];
+ uint8_t exp1[N/2];
switch(exp_strategy) {
case EXP_D15:
}
/* return the size in bits taken by the mantissa */
-int compute_mantissa_size(AC3EncodeContext *s, UINT8 *m, int nb_coefs)
+static int compute_mantissa_size(AC3EncodeContext *s, uint8_t *m, int nb_coefs)
{
int bits, mant, i;
static int bit_alloc(AC3EncodeContext *s,
- UINT8 bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
- UINT8 encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
- UINT8 exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
+ uint8_t bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
+ uint8_t encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
+ uint8_t exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
int frame_bits, int csnroffst, int fsnroffst)
{
int i, ch;
s->mant4_cnt = 0;
for(ch=0;ch<s->nb_all_channels;ch++) {
ac3_parametric_bit_allocation(&s->bit_alloc,
- bap[i][ch], (INT8 *)encoded_exp[i][ch],
+ bap[i][ch], (int8_t *)encoded_exp[i][ch],
0, s->nb_coefs[ch],
(((csnroffst-15) << 4) +
fsnroffst) << 2,
#define SNR_INC1 4
static int compute_bit_allocation(AC3EncodeContext *s,
- UINT8 bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
- UINT8 encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
- UINT8 exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
+ uint8_t bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
+ uint8_t encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
+ uint8_t exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
int frame_bits)
{
int i, ch;
int csnroffst, fsnroffst;
- UINT8 bap1[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
+ uint8_t bap1[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
static int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
/* init default parameters */
AC3EncodeContext *s = avctx->priv_data;
int i, j, ch;
float alpha;
- static const UINT8 acmod_defs[6] = {
+ static const uint8_t acmod_defs[6] = {
0x01, /* C */
0x02, /* L R */
0x03, /* L C R */
/* Output one audio block. There are NB_BLOCKS audio blocks in one AC3
frame */
static void output_audio_block(AC3EncodeContext *s,
- UINT8 exp_strategy[AC3_MAX_CHANNELS],
- UINT8 encoded_exp[AC3_MAX_CHANNELS][N/2],
- UINT8 bap[AC3_MAX_CHANNELS][N/2],
- INT32 mdct_coefs[AC3_MAX_CHANNELS][N/2],
- INT8 global_exp[AC3_MAX_CHANNELS],
+ uint8_t exp_strategy[AC3_MAX_CHANNELS],
+ uint8_t encoded_exp[AC3_MAX_CHANNELS][N/2],
+ uint8_t bap[AC3_MAX_CHANNELS][N/2],
+ int32_t mdct_coefs[AC3_MAX_CHANNELS][N/2],
+ int8_t global_exp[AC3_MAX_CHANNELS],
int block_num)
{
int ch, nb_groups, group_size, i, baie;
- UINT8 *p;
- UINT16 qmant[AC3_MAX_CHANNELS][N/2];
+ uint8_t *p;
+ uint16_t qmant[AC3_MAX_CHANNELS][N/2];
int exp0, exp1;
int mant1_cnt, mant2_cnt, mant4_cnt;
- UINT16 *qmant1_ptr, *qmant2_ptr, *qmant4_ptr;
+ uint16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr;
int delta0, delta1, delta2;
for(ch=0;ch<s->nb_channels;ch++)
}
}
-static unsigned int ac3_crc(UINT8 *data, int n, unsigned int crc)
+static unsigned int ac3_crc(uint8_t *data, int n, unsigned int crc)
{
int i;
for(i=0;i<n;i++) {
/* compute log2(max(abs(tab[]))) */
-static int log2_tab(INT16 *tab, int n)
+static int log2_tab(int16_t *tab, int n)
{
int i, v;
return av_log2(v);
}
-static void lshift_tab(INT16 *tab, int n, int lshift)
+static void lshift_tab(int16_t *tab, int n, int lshift)
{
int i;
static int output_frame_end(AC3EncodeContext *s)
{
int frame_size, frame_size_58, n, crc1, crc2, crc_inv;
- UINT8 *frame;
+ uint8_t *frame;
frame_size = s->frame_size; /* frame size in words */
/* align to 8 bits */
AC3EncodeContext *s = avctx->priv_data;
short *samples = data;
int i, j, k, v, ch;
- INT16 input_samples[N];
- INT32 mdct_coef[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
- UINT8 exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
- UINT8 exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS];
- UINT8 encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
- UINT8 bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
- INT8 exp_samples[NB_BLOCKS][AC3_MAX_CHANNELS];
+ int16_t input_samples[N];
+ int32_t mdct_coef[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
+ uint8_t exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
+ uint8_t exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS];
+ uint8_t encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
+ uint8_t bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2];
+ int8_t exp_samples[NB_BLOCKS][AC3_MAX_CHANNELS];
int frame_bits;
frame_bits = 0;
for(ch=0;ch<s->nb_all_channels;ch++) {
/* fixed mdct to the six sub blocks & exponent computation */
for(i=0;i<NB_BLOCKS;i++) {
- INT16 *sptr;
+ int16_t *sptr;
int sinc;
/* compute input samples */
- memcpy(input_samples, s->last_samples[ch], N/2 * sizeof(INT16));
+ memcpy(input_samples, s->last_samples[ch], N/2 * sizeof(int16_t));
sinc = s->nb_all_channels;
sptr = samples + (sinc * (N/2) * i) + ch;
for(j=0;j<N/2;j++) {
/* copy encoded exponents for reuse case */
for(k=i+1;k<j;k++) {
memcpy(encoded_exp[k][ch], encoded_exp[i][ch],
- s->nb_coefs[ch] * sizeof(UINT8));
+ s->nb_coefs[ch] * sizeof(uint8_t));
}
i = j;
}
static int AC3_encode_close(AVCodecContext *avctx)
{
av_freep(&avctx->coded_frame);
+ return 0;
}
#if 0
void mdct_test(void)
{
- INT16 input[N];
- INT32 output[N/2];
+ int16_t input[N];
+ int32_t output[N/2];
float input1[N];
float output1[N/2];
float s, a, err, e, emax;
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