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avcodec/aacsbr_template: Add Check to read_sbr_envelope() 

The limit is a conservative guess, the spec does not seem to specify a limit

Reviewed-by: Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-19 14:06:57 +01:00
parent 7c1c453ce9
commit 625b582d5a
1 changed files with 33 additions and 8 deletions
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41
libavcodec/aacsbr_template.c
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@ -793,7 +793,7 @@ static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
}
static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
static int read_sbr_envelope(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb,
SBRData *ch_data, int ch)
{
int bits;
@ -837,29 +837,49 @@ static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
if (ch_data->bs_df_env[i]) {
// bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
} else if (ch_data->bs_freq_res[i + 1]) {
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
} else {
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
}
} else {
ch_data->env_facs_q[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
ch_data->env_facs_q[i + 1][j] = ch_data->env_facs_q[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
if (ch_data->env_facs_q[i + 1][j] > 127U) {
av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]);
return AVERROR_INVALIDDATA;
}
}
}
}
//assign 0th elements of env_facs_q from last elements
memcpy(ch_data->env_facs_q[0], ch_data->env_facs_q[ch_data->bs_num_env],
sizeof(ch_data->env_facs_q[0]));
return 0;
}
static int read_sbr_noise(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb,
@ -953,7 +973,8 @@ static int read_sbr_single_channel_element(AACContext *ac,
return -1;
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
read_sbr_invf(sbr, gb, &sbr->data[0]);
read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
@ -981,10 +1002,12 @@ static int read_sbr_channel_pair_element(AACContext *ac,
read_sbr_invf(sbr, gb, &sbr->data[0]);
memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[1], 1)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0)
return ret;
} else {
@ -995,8 +1018,10 @@ static int read_sbr_channel_pair_element(AACContext *ac,
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
read_sbr_invf(sbr, gb, &sbr->data[0]);
read_sbr_invf(sbr, gb, &sbr->data[1]);
read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[1], 1)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)
return ret;
if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0)