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Code Issues Releases Activity

Simplify gain block handling.

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Patch by Ian Braithwaite <ian at braithwaite dot dk>

Originally committed as revision 8298 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ian Braithwaite 2007-03-08 20:43:51 +00:00 committed by Benjamin Larsson
parent 4ff5e6563e
commit d0429b4ff5
1 changed files with 52 additions and 100 deletions
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152
libavcodec/cook.c
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@ -65,10 +65,9 @@
//#define COOKDEBUG
typedef struct {
int size;
int loccode[8];
int levcode[8];
} COOKgain;
int *now;
int *previous;
} cook_gains;
typedef struct {
GetBitContext gb;
@ -102,12 +101,12 @@ typedef struct {
int mlt_size; //modulated lapped transform size
/* gain buffers */
COOKgain *gain_ptr1[2];
COOKgain *gain_ptr2[2];
COOKgain gain_1;
COOKgain gain_2;
COOKgain gain_3;
COOKgain gain_4;
cook_gains gains1;
cook_gains gains2;
int gain_1[9];
int gain_2[9];
int gain_3[9];
int gain_4[9];
/* VLC data */
int js_vlc_bits;
@ -339,29 +338,27 @@ static int cook_decode_close(AVCodecContext *avctx)
}
/**
* Fill the COOKgain structure for the timedomain quantization.
* Fill the gain array for the timedomain quantization.
*
* @param q pointer to the COOKContext
* @param gaininfo pointer to the COOKgain
* @param gaininfo[9] array of gain indices
*/
static void decode_gain_info(GetBitContext *gb, COOKgain* gaininfo) {
int i;
static void decode_gain_info(GetBitContext *gb, int *gaininfo)
{
int i, n;
while (get_bits1(gb)) {}
n = get_bits_count(gb) - 1; //amount of elements*2 to update
gaininfo->size = get_bits_count(gb) - 1; //amount of elements*2 to update
i = 0;
while (n--) {
int index = get_bits(gb, 3);
int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1;
if (get_bits_count(gb) - 1 <= 0) return;
for (i=0 ; i<gaininfo->size ; i++){
gaininfo->loccode[i] = get_bits(gb,3);
if (get_bits1(gb)) {
gaininfo->levcode[i] = get_bits(gb,4) - 7; //convert to signed
} else {
gaininfo->levcode[i] = -1;
}
while (i <= index) gaininfo[i++] = gain;
}
while (i <= 8) gaininfo[i++] = 0;
}
/**
@ -784,77 +781,34 @@ static void interpolate(COOKContext *q, float* buffer,
}
}
/**
* timedomain requantization of the timedomain samples
*
* @param q pointer to the COOKContext
* @param buffer pointer to the timedomain buffer
* @param gain_now current gain structure
* @param gain_previous previous gain structure
*/
static void gain_window(COOKContext *q, float* buffer, COOKgain* gain_now,
COOKgain* gain_previous){
int i, index;
int gain_index[9];
int tmp_gain_index;
gain_index[8]=0;
index = gain_previous->size;
for (i=7 ; i>=0 ; i--) {
if(index && gain_previous->loccode[index-1]==i) {
gain_index[i] = gain_previous->levcode[index-1];
index--;
} else {
gain_index[i]=gain_index[i+1];
}
}
/* This is applied to the to be previous data buffer. */
for(i=0;i<8;i++){
interpolate(q, &buffer[q->samples_per_channel+q->gain_size_factor*i],
gain_index[i], gain_index[i+1]);
}
tmp_gain_index = gain_index[0];
index = gain_now->size;
for (i=7 ; i>=0 ; i--) {
if(index && gain_now->loccode[index-1]==i) {
gain_index[i]= gain_now->levcode[index-1];
index--;
} else {
gain_index[i]=gain_index[i+1];
}
}
/* This is applied to the to be current block. */
for(i=0;i<8;i++){
interpolate(q, &buffer[i*q->gain_size_factor],
tmp_gain_index+gain_index[i],
tmp_gain_index+gain_index[i+1]);
}
}
/**
* mlt overlapping and buffer management
*
* @param q pointer to the COOKContext
* @param buffer pointer to the timedomain buffer
* @param gain_now current gain structure
* @param gain_previous previous gain structure
* @param gains_ptr current and previous gains
* @param previous_buffer pointer to the previous buffer to be used for overlapping
*
*/
static void gain_compensate(COOKContext *q, float* buffer, COOKgain* gain_now,
COOKgain* gain_previous, float* previous_buffer) {
static void gain_compensate(COOKContext *q, cook_gains *gains_ptr,
float* previous_buffer)
{
const float fc = q->pow2tab[gains_ptr->previous[0] + 63];
float *buffer = q->mono_mdct_output;
int i;
if((gain_now->size || gain_previous->size)) {
gain_window(q, buffer, gain_now, gain_previous);
}
/* Overlap with the previous block. */
for(i=0 ; i<q->samples_per_channel ; i++) buffer[i]+=previous_buffer[i];
for(i=0 ; i<q->samples_per_channel ; i++) {
buffer[i] *= fc;
buffer[i] += previous_buffer[i];
}
/* Apply gain profile */
for (i = 0; i < 8; i++) {
if (gains_ptr->now[i] || gains_ptr->now[i + 1])
interpolate(q, &buffer[q->gain_size_factor * i],
gains_ptr->now[i], gains_ptr->now[i + 1]);
}
/* Save away the current to be previous block. */
memcpy(previous_buffer, buffer+q->samples_per_channel,
@ -956,7 +910,7 @@ static void joint_decode(COOKContext *q, float* mlt_buffer1,
static inline void
decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer,
COOKgain *gain_ptr[])
cook_gains *gains_ptr)
{
int offset;
@ -964,10 +918,10 @@ decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer,
q->bits_per_subpacket/8);
init_get_bits(&q->gb, q->decoded_bytes_buffer + offset,
q->bits_per_subpacket);
decode_gain_info(&q->gb, gain_ptr[0]);
decode_gain_info(&q->gb, gains_ptr->now);
/* Swap current and previous gains */
FFSWAP(COOKgain *, gain_ptr[0], gain_ptr[1]);
FFSWAP(int *, gains_ptr->now, gains_ptr->previous);
}
/**
@ -985,14 +939,13 @@ decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer,
static inline void
mlt_compensate_output(COOKContext *q, float *decode_buffer,
COOKgain *gain_ptr[], float *previous_buffer,
cook_gains *gains, float *previous_buffer,
int16_t *out, int chan)
{
int j;
cook_imlt(q, decode_buffer, q->mono_mdct_output, q->mlt_tmp);
gain_compensate(q, q->mono_mdct_output, gain_ptr[0],
gain_ptr[1], previous_buffer);
gain_compensate(q, gains, previous_buffer);
/* Clip and convert floats to 16 bits.
*/
@ -1022,7 +975,7 @@ static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
// }
// av_log(NULL, AV_LOG_ERROR, "\n");
decode_bytes_and_gain(q, inbuffer, q->gain_ptr1);
decode_bytes_and_gain(q, inbuffer, &q->gains1);
if (q->joint_stereo) {
joint_decode(q, q->decode_buffer_1, q->decode_buffer_2);
@ -1030,21 +983,20 @@ static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
mono_decode(q, q->decode_buffer_1);
if (q->nb_channels == 2) {
decode_bytes_and_gain(q, inbuffer + sub_packet_size/2,
q->gain_ptr2);
decode_bytes_and_gain(q, inbuffer + sub_packet_size/2, &q->gains2);
mono_decode(q, q->decode_buffer_2);
}
}
mlt_compensate_output(q, q->decode_buffer_1, q->gain_ptr1,
mlt_compensate_output(q, q->decode_buffer_1, &q->gains1,
q->mono_previous_buffer1, outbuffer, 0);
if (q->nb_channels == 2) {
if (q->joint_stereo) {
mlt_compensate_output(q, q->decode_buffer_2, q->gain_ptr1,
mlt_compensate_output(q, q->decode_buffer_2, &q->gains1,
q->mono_previous_buffer2, outbuffer, 1);
} else {
mlt_compensate_output(q, q->decode_buffer_2, q->gain_ptr2,
mlt_compensate_output(q, q->decode_buffer_2, &q->gains2,
q->mono_previous_buffer2, outbuffer, 1);
}
}
@ -1225,10 +1177,10 @@ static int cook_decode_init(AVCodecContext *avctx)
if (q->decoded_bytes_buffer == NULL)
return -1;
q->gain_ptr1[0] = &q->gain_1;
q->gain_ptr1[1] = &q->gain_2;
q->gain_ptr2[0] = &q->gain_3;
q->gain_ptr2[1] = &q->gain_4;
q->gains1.now = q->gain_1;
q->gains1.previous = q->gain_2;
q->gains2.now = q->gain_3;
q->gains2.previous = q->gain_4;
/* Initialize transform. */
if ( init_cook_mlt(q) == 0 )