mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-12 02:14:56 +02:00
![wm4](/assets/img/avatar_default.png)
Note that convergence_duration had another meaning, one which was in practice never used. The only real use for it was a 64 bit replacement for the duration field. It's better just to make duration 64 bits, and to get rid of it. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
165 lines
5.2 KiB
C
165 lines
5.2 KiB
C
/*
|
|
* Audio Frame Queue
|
|
* Copyright (c) 2012 Justin Ruggles
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/mathematics.h"
|
|
#include "internal.h"
|
|
#include "audio_frame_queue.h"
|
|
|
|
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
|
|
{
|
|
afq->avctx = avctx;
|
|
afq->next_pts = AV_NOPTS_VALUE;
|
|
afq->remaining_delay = avctx->initial_padding;
|
|
afq->remaining_samples = avctx->initial_padding;
|
|
afq->frame_queue = NULL;
|
|
}
|
|
|
|
static void delete_next_frame(AudioFrameQueue *afq)
|
|
{
|
|
AudioFrame *f = afq->frame_queue;
|
|
if (f) {
|
|
afq->frame_queue = f->next;
|
|
f->next = NULL;
|
|
av_freep(&f);
|
|
}
|
|
}
|
|
|
|
void ff_af_queue_close(AudioFrameQueue *afq)
|
|
{
|
|
/* remove/free any remaining frames */
|
|
while (afq->frame_queue)
|
|
delete_next_frame(afq);
|
|
memset(afq, 0, sizeof(*afq));
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static void af_queue_log_state(AudioFrameQueue *afq)
|
|
{
|
|
AudioFrame *f;
|
|
ff_dlog(afq->avctx, "remaining delay = %d\n", afq->remaining_delay);
|
|
ff_dlog(afq->avctx, "remaining samples = %d\n", afq->remaining_samples);
|
|
ff_dlog(afq->avctx, "frames:\n");
|
|
f = afq->frame_queue;
|
|
while (f) {
|
|
ff_dlog(afq->avctx, " [ pts=%9"PRId64" duration=%d ]\n",
|
|
f->pts, f->duration);
|
|
f = f->next;
|
|
}
|
|
}
|
|
#endif /* DEBUG */
|
|
|
|
int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
|
|
{
|
|
AudioFrame *new_frame;
|
|
AudioFrame *queue_end = afq->frame_queue;
|
|
|
|
/* find the end of the queue */
|
|
while (queue_end && queue_end->next)
|
|
queue_end = queue_end->next;
|
|
|
|
/* allocate new frame queue entry */
|
|
if (!(new_frame = av_malloc(sizeof(*new_frame))))
|
|
return AVERROR(ENOMEM);
|
|
|
|
/* get frame parameters */
|
|
new_frame->next = NULL;
|
|
new_frame->duration = f->nb_samples;
|
|
if (f->pts != AV_NOPTS_VALUE) {
|
|
new_frame->pts = av_rescale_q(f->pts,
|
|
afq->avctx->time_base,
|
|
(AVRational){ 1, afq->avctx->sample_rate });
|
|
afq->next_pts = new_frame->pts + new_frame->duration;
|
|
} else {
|
|
new_frame->pts = AV_NOPTS_VALUE;
|
|
afq->next_pts = AV_NOPTS_VALUE;
|
|
}
|
|
|
|
/* add new frame to the end of the queue */
|
|
if (!queue_end)
|
|
afq->frame_queue = new_frame;
|
|
else
|
|
queue_end->next = new_frame;
|
|
|
|
/* add frame sample count */
|
|
afq->remaining_samples += f->nb_samples;
|
|
|
|
#ifdef DEBUG
|
|
af_queue_log_state(afq);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
|
|
int64_t *duration)
|
|
{
|
|
int64_t out_pts = AV_NOPTS_VALUE;
|
|
int removed_samples = 0;
|
|
|
|
#ifdef DEBUG
|
|
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);
|
|
}
|