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Change closed GOP structure to include an additional IDR between GOPs

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This commit is contained in:
Marko Viitanen 2018-10-04 11:17:03 +03:00
parent 954f07e3d7
commit de71b58f76
1 changed files with 27 additions and 7 deletions
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34
src/encoderstate.c
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@ -1185,10 +1185,29 @@ static void encoder_state_init_new_frame(encoder_state_t * const state, kvz_pict
if (state->frame->num == 0) {
state->frame->poc = 0;
} else if (cfg->gop_len && !cfg->gop_lowdelay) {
// Calculate POC according to the global frame counter and GOP structure
int32_t poc = state->frame->num - 1;
int32_t poc_offset = cfg->gop[state->frame->gop_offset].poc_offset;
state->frame->poc = poc - poc % cfg->gop_len + poc_offset;
int32_t framenum = state->frame->num - 1;
// Handle closed GOP
// Closed GOP structure has an extra IDR between the GOPs
if (cfg->intra_period > 0 && !cfg->open_gop) {
if (((state->frame->num - 1) % (cfg->intra_period + 1)) == cfg->intra_period) {
// Insert IDR before each new GOP after intra period in closed GOP configuration
state->frame->poc = 0;
} else {
// Calculate gop_offset again here with the new frame number
framenum = framenum % (cfg->intra_period + 1);
state->frame->gop_offset = (framenum + cfg->gop_len) % cfg->gop_len;
int32_t poc_offset = cfg->gop[state->frame->gop_offset].poc_offset;
state->frame->poc = framenum - framenum % cfg->gop_len + poc_offset;
// This should not be an irap picture in closed GOP
state->frame->is_irap = false;
}
} else { // Open GOP
// Calculate POC according to the global frame counter and GOP structure
int32_t poc_offset = cfg->gop[state->frame->gop_offset].poc_offset;
state->frame->poc = framenum - framenum % cfg->gop_len + poc_offset;
}
kvz_videoframe_set_poc(state->tile->frame, state->frame->poc);
} else if (cfg->intra_period > 0) {
state->frame->poc = state->frame->num % cfg->intra_period;
@ -1197,9 +1216,9 @@ static void encoder_state_init_new_frame(encoder_state_t * const state, kvz_pict
}
// Check whether the frame is a keyframe or not.
if (state->frame->num == 0) {
if (state->frame->num == 0 || state->frame->poc == 0) {
state->frame->is_irap = true;
} else {
} else if(cfg->open_gop) { // In closed-GOP IDR frames are poc==0 so skip this check
state->frame->is_irap =
cfg->intra_period > 0 &&
(state->frame->poc % cfg->intra_period) == 0;
@ -1213,7 +1232,8 @@ static void encoder_state_init_new_frame(encoder_state_t * const state, kvz_pict
if (state->frame->num == 0 ||
cfg->intra_period == 1 ||
cfg->gop_len == 0 ||
cfg->gop_lowdelay)
cfg->gop_lowdelay ||
!cfg->open_gop) // Closed GOP uses IDR pictures
{
state->frame->pictype = KVZ_NAL_IDR_W_RADL;
} else {