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aacsbr: Cleanup the newly merged read_sbr_grid, eliminating several context 

and some duplicate local variables.

Originally committed as revision 22384 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.6
Alex Converse 16 years ago
parent
7333f849b1
commit
7935078623
2 changed files with 48 additions and 65 deletions
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  1. +48
    -61
      libavcodec/aacsbr.c
  2. +0
    -4
      libavcodec/sbr.h

+ 48
- 61
libavcodec/aacsbr.c View File

@@ -617,6 +617,12 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
GetBitContext *gb, SBRData *ch_data)
{
int i;
unsigned bs_pointer;
int abs_bord_lead = 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;
uint8_t bs_rel_bord[2][3];

ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env[1]];
ch_data->bs_num_env[0] = ch_data->bs_num_env[1];
@@ -625,6 +631,7 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
case FIXFIX:
ch_data->bs_num_env[1] = 1 << get_bits(gb, 2);
num_rel_lead = ch_data->bs_num_env[1] - 1;
if (ch_data->bs_num_env[1] == 1)
ch_data->bs_amp_res = 0;

@@ -635,43 +642,44 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
return -1;
}

ch_data->bs_pointer = 0;
bs_pointer = 0;

ch_data->bs_freq_res[1] = get_bits1(gb);
for (i = 1; i < ch_data->bs_num_env[1]; i++)
ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
break;
case FIXVAR:
ch_data->bs_var_bord[1] = get_bits(gb, 2);
ch_data->bs_num_rel[1] = get_bits(gb, 2);
ch_data->bs_num_env[1] = ch_data->bs_num_rel[1] + 1;
abs_bord_trail += get_bits(gb, 2);
num_rel_trail = get_bits(gb, 2);
num_rel_lead = 0;
ch_data->bs_num_env[1] = num_rel_trail + 1;

for (i = 0; i < ch_data->bs_num_rel[1]; i++)
ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
for (i = 0; i < num_rel_trail; i++)
bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;

ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);

for (i = 0; i < ch_data->bs_num_env[1]; i++)
ch_data->bs_freq_res[ch_data->bs_num_env[1] - i] = get_bits1(gb);
break;
case VARFIX:
ch_data->bs_var_bord[0] = get_bits(gb, 2);
ch_data->bs_num_rel[0] = get_bits(gb, 2);
ch_data->bs_num_env[1] = ch_data->bs_num_rel[0] + 1;
abs_bord_lead = get_bits(gb, 2);
num_rel_lead = get_bits(gb, 2);
ch_data->bs_num_env[1] = num_rel_lead + 1;

for (i = 0; i < ch_data->bs_num_rel[0]; i++)
ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
for (i = 0; i < num_rel_lead; i++)
bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;

ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);

get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
break;
case VARVAR:
ch_data->bs_var_bord[0] = get_bits(gb, 2);
ch_data->bs_var_bord[1] = get_bits(gb, 2);
ch_data->bs_num_rel[0] = get_bits(gb, 2);
ch_data->bs_num_rel[1] = get_bits(gb, 2);
ch_data->bs_num_env[1] = ch_data->bs_num_rel[0] + ch_data->bs_num_rel[1] + 1;
abs_bord_lead = 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[1] = num_rel_lead + num_rel_trail + 1;

if (ch_data->bs_num_env[1] > 5) {
av_log(ac->avccontext, AV_LOG_ERROR,
@@ -680,38 +688,21 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
return -1;
}

for (i = 0; i < ch_data->bs_num_rel[0]; i++)
ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
for (i = 0; i < ch_data->bs_num_rel[1]; i++)
ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
for (i = 0; i < num_rel_lead; i++)
bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
for (i = 0; i < num_rel_trail; i++)
bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;

ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);

get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
break;
}

if (ch_data->bs_pointer > ch_data->bs_num_env[1] + 1) {
if (bs_pointer > ch_data->bs_num_env[1] + 1) {
av_log(ac->avccontext, AV_LOG_ERROR,
"Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
ch_data->bs_pointer);
return -1;
}

int abs_bord_lead = ch_data->bs_frame_class >= 2 ? ch_data->bs_var_bord[0] : 0;
// frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
int abs_bord_trail = (ch_data->bs_frame_class & 1 ? ch_data->bs_var_bord[1] : 0) + 16;
int n_rel_lead;

if (ch_data->bs_frame_class == FIXFIX) {
n_rel_lead = ch_data->bs_num_env[1] - 1;
} else if (ch_data->bs_frame_class == FIXVAR) {
n_rel_lead = 0;
} else if (ch_data->bs_frame_class < 4) { // VARFIX or VARVAR
n_rel_lead = ch_data->bs_num_rel[0];
} else {
av_log(ac->avccontext, AV_LOG_ERROR,
"Invalid bs_frame_class for SBR: %d\n", ch_data->bs_frame_class);
bs_pointer);
return -1;
}

@@ -722,22 +713,22 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
if (ch_data->bs_frame_class == FIXFIX) {
int temp = (abs_bord_trail + (ch_data->bs_num_env[1] >> 1)) /
ch_data->bs_num_env[1];
for (i = 0; i < n_rel_lead; i++)
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + temp;
} else if (ch_data->bs_frame_class > 1) { // VARFIX or VARVAR
for (i = 0; i < n_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + ch_data->bs_rel_bord[0][i];
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = ch_data->t_env[i] + bs_rel_bord[0][i];
} else { // FIXVAR
for (i = 0; i < n_rel_lead; i++)
for (i = 0; i < num_rel_lead; i++)
ch_data->t_env[i + 1] = abs_bord_lead;
}

if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
for (i = ch_data->bs_num_env[1] - 1; i > n_rel_lead; i--)
for (i = ch_data->bs_num_env[1] - 1; i > num_rel_lead; i--)
ch_data->t_env[i] = ch_data->t_env[i + 1] -
ch_data->bs_rel_bord[1][ch_data->bs_num_env[1] - 1 - i];
bs_rel_bord[1][ch_data->bs_num_env[1] - 1 - i];
} else { // FIXFIX or VARFIX
for (i = n_rel_lead; i < ch_data->bs_num_env[1]; i++)
for (i = num_rel_lead; i < ch_data->bs_num_env[1]; i++)
ch_data->t_env[i + 1] = abs_bord_trail;
}

@@ -749,14 +740,14 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
if (ch_data->bs_frame_class == FIXFIX) {
idx = ch_data->bs_num_env[1] >> 1;
} else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
idx = ch_data->bs_num_env[1] - FFMAX(ch_data->bs_pointer - 1, 1);
idx = ch_data->bs_num_env[1] - FFMAX(bs_pointer - 1, 1);
} else { // VARFIX
if (!ch_data->bs_pointer)
if (!bs_pointer)
idx = 1;
else if (ch_data->bs_pointer == 1)
else if (bs_pointer == 1)
idx = ch_data->bs_num_env[1] - 1;
else // bs_pointer > 1
idx = ch_data->bs_pointer - 1;
idx = bs_pointer - 1;
}
ch_data->t_q[1] = ch_data->t_env[idx];
ch_data->t_q[2] = ch_data->t_env[ch_data->bs_num_env[1]];
@@ -765,10 +756,10 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,

ch_data->e_a[0] = -(ch_data->e_a[1] != ch_data->bs_num_env[0]); // l_APrev
ch_data->e_a[1] = -1;
if ((ch_data->bs_frame_class & 1) && ch_data->bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
ch_data->e_a[1] = ch_data->bs_num_env[1] + 1 - ch_data->bs_pointer;
} else if ((ch_data->bs_frame_class == 2) && (ch_data->bs_pointer > 1)) // VARFIX and bs_pointer > 1
ch_data->e_a[1] = ch_data->bs_pointer - 1;
if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
ch_data->e_a[1] = ch_data->bs_num_env[1] + 1 - bs_pointer;
} else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
ch_data->e_a[1] = bs_pointer - 1;

return 0;
}
@@ -783,14 +774,10 @@ static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
//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->bs_num_env+1, src->bs_num_env+1, sizeof(dst->bs_num_env)- sizeof(*dst->bs_num_env));
memcpy(dst->bs_var_bord, src->bs_var_bord, sizeof(dst->bs_var_bord));
memcpy(dst->bs_rel_bord, src->bs_rel_bord, sizeof(dst->bs_rel_bord));
memcpy(dst->bs_num_rel, src->bs_num_rel, sizeof(dst->bs_rel_bord));
memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
dst->bs_amp_res = src->bs_amp_res;
dst->bs_num_noise = src->bs_num_noise;
dst->bs_pointer = src->bs_pointer;
dst->bs_frame_class = src->bs_frame_class;
dst->e_a[1] = src->e_a[1];
}


+ 0
- 4
libavcodec/sbr.h View File

@@ -64,10 +64,6 @@ typedef struct {
unsigned bs_add_harmonic_flag;
unsigned bs_num_env[2];
uint8_t bs_freq_res[7];
uint8_t bs_var_bord[2];
uint8_t bs_num_rel[2];
uint8_t bs_rel_bord[2][3];
unsigned bs_pointer;
unsigned bs_num_noise;
uint8_t bs_df_env[5];
uint8_t bs_df_noise[2];


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