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Code Issues Releases Activity

avformat/iamf_parse: add checks to parameter definition durations

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Section 3.6.1 of the IAMF spec states "When constant_subblock_duration is equal to 0, the summation of all
subblock_duration in this parameter block SHALL be equal to duration.".

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2024-12-11 23:27:00 -03:00
parent 8ad34e97b6
commit d38fc25519
2 changed files with 25 additions and 4 deletions
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14
libavformat/iamf_parse.c
View File

@ -501,6 +501,7 @@ static int param_parse(void *s, IAMFContext *c, AVIOContext *pb,
AVIAMFParamDefinition *param;
unsigned int parameter_id, parameter_rate, mode;
unsigned int duration = 0, constant_subblock_duration = 0, nb_subblocks = 0;
unsigned int total_duration = 0;
size_t param_size;
parameter_id = ffio_read_leb(pb);
@ -521,8 +522,10 @@ static int param_parse(void *s, IAMFContext *c, AVIOContext *pb,
constant_subblock_duration = ffio_read_leb(pb);
if (constant_subblock_duration == 0)
nb_subblocks = ffio_read_leb(pb);
else
else {
nb_subblocks = duration / constant_subblock_duration;
total_duration = duration;
}
}
param = av_iamf_param_definition_alloc(type, nb_subblocks, &param_size);
@ -533,8 +536,10 @@ static int param_parse(void *s, IAMFContext *c, AVIOContext *pb,
void *subblock = av_iamf_param_definition_get_subblock(param, i);
unsigned int subblock_duration = constant_subblock_duration;
if (constant_subblock_duration == 0)
if (constant_subblock_duration == 0) {
subblock_duration = ffio_read_leb(pb);
total_duration += subblock_duration;
}
switch (type) {
case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN: {
@ -562,6 +567,11 @@ static int param_parse(void *s, IAMFContext *c, AVIOContext *pb,
}
}
if (!mode && !constant_subblock_duration && total_duration != duration) {
av_log(s, AV_LOG_ERROR, "Invalid subblock durations in parameter_id %u\n", parameter_id);
return AVERROR_INVALIDDATA;
}
param->parameter_id = parameter_id;
param->parameter_rate = parameter_rate;
param->duration = duration;

15
libavformat/iamf_reader.c
View File

@ -109,6 +109,7 @@ static int parameter_block_obu(AVFormatContext *s, IAMFDemuxContext *c,
AVIOContext *pb;
uint8_t *buf;
unsigned int duration, constant_subblock_duration;
unsigned int total_duration = 0;
unsigned int nb_subblocks;
unsigned int parameter_id;
size_t out_param_size;
@ -147,8 +148,10 @@ static int parameter_block_obu(AVFormatContext *s, IAMFDemuxContext *c,
constant_subblock_duration = ffio_read_leb(pb);
if (constant_subblock_duration == 0)
nb_subblocks = ffio_read_leb(pb);
else
else {
nb_subblocks = duration / constant_subblock_duration;
total_duration = duration;
}
} else {
duration = param->duration;
constant_subblock_duration = param->constant_subblock_duration;
@ -172,8 +175,10 @@ static int parameter_block_obu(AVFormatContext *s, IAMFDemuxContext *c,
void *subblock = av_iamf_param_definition_get_subblock(out_param, i);
unsigned int subblock_duration = constant_subblock_duration;
if (!param_definition->mode && !constant_subblock_duration)
if (!param_definition->mode && !constant_subblock_duration) {
subblock_duration = ffio_read_leb(pb);
total_duration += subblock_duration;
}
switch (param->type) {
case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN: {
@ -235,6 +240,12 @@ static int parameter_block_obu(AVFormatContext *s, IAMFDemuxContext *c,
av_log(s, level, "Underread in parameter_block_obu. %d bytes left at the end\n", len);
}
if (!param_definition->mode && !constant_subblock_duration && total_duration != duration) {
av_log(s, AV_LOG_ERROR, "Invalid duration in parameter block\n");
ret = AVERROR_INVALIDDATA;
goto fail;
}
switch (param->type) {
case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN:
av_free(c->mix);