3 * Copyright (c) 2012 Justin Ruggles
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/attributes.h"
23 #include "libavutil/common.h"
24 #include "libavutil/mathematics.h"
26 #include "audio_frame_queue.h"
28 av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
31 afq->next_pts = AV_NOPTS_VALUE;
32 afq->remaining_delay = avctx->delay;
33 afq->remaining_samples = avctx->delay;
34 afq->frame_queue = NULL;
37 static void delete_next_frame(AudioFrameQueue *afq)
39 AudioFrame *f = afq->frame_queue;
41 afq->frame_queue = f->next;
47 void ff_af_queue_close(AudioFrameQueue *afq)
49 /* remove/free any remaining frames */
50 while (afq->frame_queue)
51 delete_next_frame(afq);
52 memset(afq, 0, sizeof(*afq));
56 static void af_queue_log_state(AudioFrameQueue *afq)
59 av_dlog(afq->avctx, "remaining delay = %d\n", afq->remaining_delay);
60 av_dlog(afq->avctx, "remaining samples = %d\n", afq->remaining_samples);
61 av_dlog(afq->avctx, "frames:\n");
64 av_dlog(afq->avctx, " [ pts=%9"PRId64" duration=%d ]\n",
71 int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
73 AudioFrame *new_frame;
74 AudioFrame *queue_end = afq->frame_queue;
76 /* find the end of the queue */
77 while (queue_end && queue_end->next)
78 queue_end = queue_end->next;
80 /* allocate new frame queue entry */
81 if (!(new_frame = av_malloc(sizeof(*new_frame))))
82 return AVERROR(ENOMEM);
84 /* get frame parameters */
85 new_frame->next = NULL;
86 new_frame->duration = f->nb_samples;
87 if (f->pts != AV_NOPTS_VALUE) {
88 new_frame->pts = av_rescale_q(f->pts,
89 afq->avctx->time_base,
90 (AVRational){ 1, afq->avctx->sample_rate });
91 afq->next_pts = new_frame->pts + new_frame->duration;
93 new_frame->pts = AV_NOPTS_VALUE;
94 afq->next_pts = AV_NOPTS_VALUE;
97 /* add new frame to the end of the queue */
99 afq->frame_queue = new_frame;
101 queue_end->next = new_frame;
103 /* add frame sample count */
104 afq->remaining_samples += f->nb_samples;
107 af_queue_log_state(afq);
113 void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
116 int64_t out_pts = AV_NOPTS_VALUE;
117 int removed_samples = 0;
120 af_queue_log_state(afq);
123 /* get output pts from the next frame or generated pts */
124 if (afq->frame_queue) {
125 if (afq->frame_queue->pts != AV_NOPTS_VALUE)
126 out_pts = afq->frame_queue->pts - afq->remaining_delay;
128 if (afq->next_pts != AV_NOPTS_VALUE)
129 out_pts = afq->next_pts - afq->remaining_delay;
132 if (out_pts != AV_NOPTS_VALUE)
133 *pts = ff_samples_to_time_base(afq->avctx, out_pts);
135 *pts = AV_NOPTS_VALUE;
138 /* if the delay is larger than the packet duration, we use up delay samples
139 for the output packet and leave all frames in the queue */
140 if (afq->remaining_delay >= nb_samples) {
141 removed_samples += nb_samples;
142 afq->remaining_delay -= nb_samples;
144 /* remove frames from the queue until we have enough to cover the
145 requested number of samples or until the queue is empty */
146 while (removed_samples < nb_samples && afq->frame_queue) {
147 removed_samples += afq->frame_queue->duration;
148 delete_next_frame(afq);
150 afq->remaining_samples -= removed_samples;
152 /* if there are no frames left and we have room for more samples, use
153 any remaining delay samples */
154 if (removed_samples < nb_samples && afq->remaining_samples > 0) {
155 int add_samples = FFMIN(afq->remaining_samples,
156 nb_samples - removed_samples);
157 removed_samples += add_samples;
158 afq->remaining_samples -= add_samples;
160 if (removed_samples > nb_samples)
161 av_log(afq->avctx, AV_LOG_WARNING, "frame_size is too large\n");
163 *duration = ff_samples_to_time_base(afq->avctx, removed_samples);