/* * Audio Frame Queue * Copyright (c) 2012 Justin Ruggles * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/common.h" #include "audio_frame_queue.h" #include "internal.h" #include "libavutil/avassert.h" void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq) { afq->avctx = avctx; afq->remaining_delay = avctx->delay; afq->remaining_samples = avctx->delay; afq->frame_count = 0; } void ff_af_queue_close(AudioFrameQueue *afq) { if(afq->frame_count) av_log(afq->avctx, AV_LOG_WARNING, "%d frames left in the queue on closing\n", afq->frame_count); av_freep(&afq->frames); memset(afq, 0, sizeof(*afq)); } int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f) { AudioFrame *new = av_fast_realloc(afq->frames, &afq->frame_alloc, sizeof(*afq->frames)*(afq->frame_count+1)); if(!new) return AVERROR(ENOMEM); afq->frames = new; new += afq->frame_count; /* get frame parameters */ new->duration = f->nb_samples; new->duration += afq->remaining_delay; if (f->pts != AV_NOPTS_VALUE) { new->pts = av_rescale_q(f->pts, afq->avctx->time_base, (AVRational){ 1, afq->avctx->sample_rate }); new->pts -= afq->remaining_delay; if(afq->frame_count && new[-1].pts >= new->pts) av_log(afq->avctx, AV_LOG_WARNING, "Queue input is backward in time\n"); } else { new->pts = AV_NOPTS_VALUE; } afq->remaining_delay = 0; /* add frame sample count */ afq->remaining_samples += f->nb_samples; afq->frame_count++; return 0; } 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; int i; if (afq->frame_count || afq->frame_alloc) { if (afq->frames->pts != AV_NOPTS_VALUE) out_pts = afq->frames->pts; } if(!afq->frame_count) av_log(afq->avctx, AV_LOG_WARNING, "Trying to remove %d samples, but the queue is empty\n", nb_samples); if (pts) *pts = ff_samples_to_time_base(afq->avctx, out_pts); for(i=0; nb_samples && i<afq->frame_count; i++){ int n= FFMIN(afq->frames[i].duration, nb_samples); afq->frames[i].duration -= n; nb_samples -= n; removed_samples += n; if(afq->frames[i].pts != AV_NOPTS_VALUE) afq->frames[i].pts += n; } afq->remaining_samples -= removed_samples; i -= i && afq->frames[i-1].duration; memmove(afq->frames, afq->frames + i, sizeof(*afq->frames) * (afq->frame_count - i)); afq->frame_count -= i; if(nb_samples){ av_assert0(!afq->frame_count); av_assert0(afq->remaining_samples == afq->remaining_delay); if(afq->frames && afq->frames[0].pts != AV_NOPTS_VALUE) afq->frames[0].pts += nb_samples; av_log(afq->avctx, AV_LOG_DEBUG, "Trying to remove %d more samples than there are in the queue\n", nb_samples); } if (duration) *duration = ff_samples_to_time_base(afq->avctx, removed_samples); }