[FFmpeg-cvslog] r22412 - trunk/libavcodec/aacsbr.c
alexc
subversion
Tue Mar 9 22:46:47 CET 2010
Author: alexc
Date: Tue Mar 9 22:46:46 2010
New Revision: 22412
Log:
aacsbr: Cleanup read_sbr_grid and copy_sbr_grid after the recent overhaul of those functions.
Modified:
trunk/libavcodec/aacsbr.c
Modified: trunk/libavcodec/aacsbr.c
==============================================================================
--- trunk/libavcodec/aacsbr.c Tue Mar 9 22:35:55 2010 (r22411)
+++ trunk/libavcodec/aacsbr.c Tue Mar 9 22:46:46 2010 (r22412)
@@ -618,7 +618,7 @@ static int read_sbr_grid(AACContext *ac,
GetBitContext *gb, SBRData *ch_data)
{
int i;
- unsigned bs_pointer;
+ unsigned bs_pointer = 0;
// frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
int abs_bord_trail = 16;
int num_rel_lead, num_rel_trail;
@@ -630,8 +630,8 @@ static int read_sbr_grid(AACContext *ac,
switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
case FIXFIX:
- ch_data->bs_num_env = 1 << get_bits(gb, 2);
- num_rel_lead = ch_data->bs_num_env - 1;
+ ch_data->bs_num_env = 1 << get_bits(gb, 2);
+ num_rel_lead = ch_data->bs_num_env - 1;
if (ch_data->bs_num_env == 1)
ch_data->bs_amp_res = 0;
@@ -650,22 +650,20 @@ static int read_sbr_grid(AACContext *ac,
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
- bs_pointer = 0;
-
ch_data->bs_freq_res[1] = get_bits1(gb);
for (i = 1; i < ch_data->bs_num_env; i++)
ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
break;
case FIXVAR:
- abs_bord_trail += get_bits(gb, 2);
- num_rel_trail = get_bits(gb, 2);
- num_rel_lead = 0;
- ch_data->bs_num_env = num_rel_trail + 1;
- ch_data->t_env[0] = 0;
+ abs_bord_trail += get_bits(gb, 2);
+ num_rel_trail = get_bits(gb, 2);
+ ch_data->bs_num_env = num_rel_trail + 1;
+ ch_data->t_env[0] = 0;
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
for (i = 0; i < num_rel_trail; i++)
- ch_data->t_env[ch_data->bs_num_env - 1 - i] = ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
+ ch_data->t_env[ch_data->bs_num_env - 1 - i] =
+ ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
@@ -673,9 +671,9 @@ static int read_sbr_grid(AACContext *ac,
ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
break;
case VARFIX:
- ch_data->t_env[0] = get_bits(gb, 2);
- num_rel_lead = get_bits(gb, 2);
- ch_data->bs_num_env = num_rel_lead + 1;
+ ch_data->t_env[0] = get_bits(gb, 2);
+ num_rel_lead = get_bits(gb, 2);
+ ch_data->bs_num_env = num_rel_lead + 1;
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
for (i = 0; i < num_rel_lead; i++)
@@ -686,11 +684,11 @@ static int read_sbr_grid(AACContext *ac,
get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
break;
case VARVAR:
- ch_data->t_env[0] = get_bits(gb, 2);
- abs_bord_trail += get_bits(gb, 2);
- num_rel_lead = get_bits(gb, 2);
- num_rel_trail = get_bits(gb, 2);
- ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
+ ch_data->t_env[0] = get_bits(gb, 2);
+ abs_bord_trail += get_bits(gb, 2);
+ num_rel_lead = get_bits(gb, 2);
+ num_rel_trail = get_bits(gb, 2);
+ ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
if (ch_data->bs_num_env > 5) {
@@ -703,7 +701,8 @@ static int read_sbr_grid(AACContext *ac,
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
for (i = 0; i < num_rel_trail; i++)
- ch_data->t_env[ch_data->bs_num_env - 1 - i] = ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
+ ch_data->t_env[ch_data->bs_num_env - 1 - i] =
+ ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
@@ -720,7 +719,7 @@ static int read_sbr_grid(AACContext *ac,
ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
- ch_data->t_q[0] = ch_data->t_env[0];
+ ch_data->t_q[0] = ch_data->t_env[0];
ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
if (ch_data->bs_num_noise > 1) {
unsigned int idx;
@@ -751,19 +750,19 @@ static int read_sbr_grid(AACContext *ac,
static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
//These variables are saved from the previous frame rather than copied
- dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
+ dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
- dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
+ dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
//These variables are read from the bitstream and therefore copied
memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
- dst->bs_num_env = src->bs_num_env;
- dst->bs_amp_res = src->bs_amp_res;
- dst->bs_num_noise = src->bs_num_noise;
- dst->bs_frame_class = src->bs_frame_class;
- dst->e_a[1] = src->e_a[1];
+ dst->bs_num_env = src->bs_num_env;
+ dst->bs_amp_res = src->bs_amp_res;
+ dst->bs_num_noise = src->bs_num_noise;
+ dst->bs_frame_class = src->bs_frame_class;
+ dst->e_a[1] = src->e_a[1];
}
/// Read how the envelope and noise floor data is delta coded
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