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/common.h"
23 #include "libavutil/mathematics.h"
25 #include "audio_frame_queue.h"
27 void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
30 afq->next_pts = AV_NOPTS_VALUE;
31 afq->remaining_delay = avctx->delay;
32 afq->remaining_samples = avctx->delay;
33 afq->frame_queue = NULL;
36 static void delete_next_frame(AudioFrameQueue *afq)
38 AudioFrame *f = afq->frame_queue;
40 afq->frame_queue = f->next;
46 void ff_af_queue_close(AudioFrameQueue *afq)
48 /* remove/free any remaining frames */
49 while (afq->frame_queue)
50 delete_next_frame(afq);
51 memset(afq, 0, sizeof(*afq));
55 static void af_queue_log_state(AudioFrameQueue *afq)
58 av_dlog(afq->avctx, "remaining delay = %d\n", afq->remaining_delay);
59 av_dlog(afq->avctx, "remaining samples = %d\n", afq->remaining_samples);
60 av_dlog(afq->avctx, "frames:\n");
63 av_dlog(afq->avctx, " [ pts=%9"PRId64" duration=%d ]\n",
70 int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
72 AudioFrame *new_frame;
73 AudioFrame *queue_end = afq->frame_queue;
75 /* find the end of the queue */
76 while (queue_end && queue_end->next)
77 queue_end = queue_end->next;
79 /* allocate new frame queue entry */
80 if (!(new_frame = av_malloc(sizeof(*new_frame))))
81 return AVERROR(ENOMEM);
83 /* get frame parameters */
84 new_frame->next = NULL;
85 new_frame->duration = f->nb_samples;
86 if (f->pts != AV_NOPTS_VALUE) {
87 new_frame->pts = av_rescale_q(f->pts,
88 afq->avctx->time_base,
89 (AVRational){ 1, afq->avctx->sample_rate });
90 afq->next_pts = new_frame->pts + new_frame->duration;
92 new_frame->pts = AV_NOPTS_VALUE;
93 afq->next_pts = AV_NOPTS_VALUE;
96 /* add new frame to the end of the queue */
98 afq->frame_queue = new_frame;
100 queue_end->next = new_frame;
102 /* add frame sample count */
103 afq->remaining_samples += f->nb_samples;
106 af_queue_log_state(afq);
112 void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
115 int64_t out_pts = AV_NOPTS_VALUE;
116 int removed_samples = 0;
119 af_queue_log_state(afq);
122 /* get output pts from the next frame or generated pts */
123 if (afq->frame_queue) {
124 if (afq->frame_queue->pts != AV_NOPTS_VALUE)
125 out_pts = afq->frame_queue->pts - afq->remaining_delay;
127 if (afq->next_pts != AV_NOPTS_VALUE)
128 out_pts = afq->next_pts - afq->remaining_delay;
131 if (out_pts != AV_NOPTS_VALUE)
132 *pts = ff_samples_to_time_base(afq->avctx, out_pts);
134 *pts = AV_NOPTS_VALUE;
137 /* if the delay is larger than the packet duration, we use up delay samples
138 for the output packet and leave all frames in the queue */
139 if (afq->remaining_delay >= nb_samples) {
140 removed_samples += nb_samples;
141 afq->remaining_delay -= nb_samples;
143 /* remove frames from the queue until we have enough to cover the
144 requested number of samples or until the queue is empty */
145 while (removed_samples < nb_samples && afq->frame_queue) {
146 removed_samples += afq->frame_queue->duration;
147 delete_next_frame(afq);
149 afq->remaining_samples -= removed_samples;
151 /* if there are no frames left and we have room for more samples, use
152 any remaining delay samples */
153 if (removed_samples < nb_samples && afq->remaining_samples > 0) {
154 int add_samples = FFMIN(afq->remaining_samples,
155 nb_samples - removed_samples);
156 removed_samples += add_samples;
157 afq->remaining_samples -= add_samples;
159 if (removed_samples > nb_samples)
160 av_log(afq->avctx, AV_LOG_WARNING, "frame_size is too large\n");
162 *duration = ff_samples_to_time_base(afq->avctx, removed_samples);