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aacsbr: Propagate errors from read_sbr_grid to prevent crashes in malformatted streams. 

Originally committed as revision 22375 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-03-09 06:13:48 +00:00
parent e0be763052
commit 58b1cba0c9
1 changed files with 17 additions and 8 deletions
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25
libavcodec/aacsbr.c
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@ -857,14 +857,15 @@ static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
}
}
static void read_sbr_single_channel_element(AACContext *ac,
static int read_sbr_single_channel_element(AACContext *ac,
SpectralBandReplication *sbr,
GetBitContext *gb)
{
if (get_bits1(gb)) // bs_data_extra
skip_bits(gb, 4); // bs_reserved
read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
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);
@ -874,7 +875,7 @@ static void read_sbr_single_channel_element(AACContext *ac,
get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
}
static void read_sbr_channel_pair_element(AACContext *ac,
static int read_sbr_channel_pair_element(AACContext *ac,
SpectralBandReplication *sbr,
GetBitContext *gb)
{
@ -882,7 +883,8 @@ static void read_sbr_channel_pair_element(AACContext *ac,
skip_bits(gb, 8); // bs_reserved
if ((sbr->bs_coupling = get_bits1(gb))) {
read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
return -1;
copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
@ -894,8 +896,9 @@ static void read_sbr_channel_pair_element(AACContext *ac,
read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
read_sbr_noise(sbr, gb, &sbr->data[1], 1);
} else {
read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
read_sbr_grid(ac, sbr, gb, &sbr->data[1]);
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
return -1;
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
read_sbr_invf(sbr, gb, &sbr->data[0]);
@ -918,9 +921,15 @@ static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
unsigned int cnt = get_bits_count(gb);
if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
read_sbr_single_channel_element(ac, sbr, gb);
if (read_sbr_single_channel_element(ac, sbr, gb)) {
sbr->start = 0;
return get_bits_count(gb) - cnt;
}
} else if (id_aac == TYPE_CPE) {
read_sbr_channel_pair_element(ac, sbr, gb);
if (read_sbr_channel_pair_element(ac, sbr, gb)) {
sbr->start = 0;
return get_bits_count(gb) - cnt;
}
} else {
av_log(ac->avccontext, AV_LOG_ERROR,
"Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);