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For #307, refactor code, parse B-frame by sample.

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winlin 2020-04-11 15:11:42 +08:00
parent 719c0ae85b
commit 5b9cb7dc3f
3 changed files with 51 additions and 22 deletions
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42
trunk/src/kernel/srs_kernel_codec.cpp
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@ -364,12 +364,53 @@ SrsSample::SrsSample()
{
size = 0;
bytes = NULL;
bframe = false;
}
SrsSample::~SrsSample()
{
}
srs_error_t SrsSample::parse_bframe()
{
srs_error_t err = srs_success;
// H.264 nalu header type mask.
static uint8_t kNalTypeMask = 0x1F;
uint8_t header = bytes[0];
SrsAvcNaluType nal_type = (SrsAvcNaluType)(header & kNalTypeMask);
if (nal_type != SrsAvcNaluTypeNonIDR && nal_type != SrsAvcNaluTypeDataPartitionA && nal_type != SrsAvcNaluTypeIDR) {
return err;
}
SrsBuffer* stream = new SrsBuffer(bytes, size);
SrsAutoFree(SrsBuffer, stream);
// Skip nalu header.
stream->skip(1);
SrsBitBuffer bitstream(stream);
int32_t first_mb_in_slice = 0;
if ((err = srs_avc_nalu_read_uev(&bitstream, first_mb_in_slice)) != srs_success) {
return srs_error_wrap(err, "nalu read uev");
}
int32_t slice_type_v = 0;
if ((err = srs_avc_nalu_read_uev(&bitstream, slice_type_v)) != srs_success) {
return srs_error_wrap(err, "nalu read uev");
}
SrsAvcSliceType slice_type = (SrsAvcSliceType)slice_type_v;
if (slice_type == SrsAvcSliceTypeB || slice_type == SrsAvcSliceTypeB1) {
bframe = true;
srs_verbose("nal_type=%d, slice type=%d", nal_type, slice_type);
}
return err;
}
SrsCodecConfig::SrsCodecConfig()
{
}
@ -458,6 +499,7 @@ srs_error_t SrsFrame::add_sample(char* bytes, int size)
SrsSample* sample = &samples[nb_samples++];
sample->bytes = bytes;
sample->size = size;
sample->bframe = false;
return err;
}