void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int *duration) { int64_t out_pts = AV_NOPTS_VALUE; int removed_samples = 0; #ifdef DEBUG ff_af_queue_log_state(afq); #endif /* get output pts from the next frame or generated pts */ if (afq->frame_queue) { if (afq->frame_queue->pts != AV_NOPTS_VALUE) out_pts = afq->frame_queue->pts - afq->remaining_delay; } else { if (afq->next_pts != AV_NOPTS_VALUE) out_pts = afq->next_pts - afq->remaining_delay; } if (pts) { if (out_pts != AV_NOPTS_VALUE) *pts = ff_samples_to_time_base(afq->avctx, out_pts); else *pts = AV_NOPTS_VALUE; } /* if the delay is larger than the packet duration, we use up delay samples for the output packet and leave all frames in the queue */ if (afq->remaining_delay >= nb_samples) { removed_samples += nb_samples; afq->remaining_delay -= nb_samples; } /* remove frames from the queue until we have enough to cover the requested number of samples or until the queue is empty */ while (removed_samples < nb_samples && afq->frame_queue) { removed_samples += afq->frame_queue->duration; delete_next_frame(afq); } afq->remaining_samples -= removed_samples; /* if there are no frames left and we have room for more samples, use any remaining delay samples */ if (removed_samples < nb_samples && afq->remaining_samples > 0) { int add_samples = FFMIN(afq->remaining_samples, nb_samples - removed_samples); removed_samples += add_samples; afq->remaining_samples -= add_samples; } if (removed_samples > nb_samples) av_log(afq->avctx, AV_LOG_WARNING, "frame_size is too large\n"); if (duration) *duration = ff_samples_to_time_base(afq->avctx, removed_samples); }