mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 11:49:48 +00:00
4f6cd883f0
Instead check the timestamps while muxing, to avoid buffering a too long timestamp range into one single packet. This makes the AMR and AAC packetization slightly less efficient, since we set a possibly unnecessarily high max_frames_per_packet. (These packetizers end up doing a memmove of the TOC bytes if sending a packet before max_frames_per_packet is achieved, and we end up setting max_frames_per_packet to a value that should be high enough for most uses.) All packetizers that use max_frames_per_packet now set it either to a default value, or to a value calculated based on other parameters, so none of them rely on the previous default setting. For iLBC, copy one frame at a time, to allow checking the timestamp range for each of them - basically doing potentially multiple loops to simplify the code instead of trying to calculate the number of frames to buffer while honoring s1->max_delay. This is in preparation for reducing the coupling between libavformat and libavcodec, by not having the muxers use the encoder field frame_size (which may not be available during e.g. stream copy). Signed-off-by: Martin Storsjö <martin@martin.st>
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/*
|
|
* copyright (c) 2007 Luca Abeni
|
|
*
|
|
* 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/intreadwrite.h"
|
|
|
|
#include "avformat.h"
|
|
#include "rtpenc.h"
|
|
|
|
|
|
void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
|
|
{
|
|
RTPMuxContext *s = s1->priv_data;
|
|
AVStream *st = s1->streams[0];
|
|
const int max_au_headers_size = 2 + 2 * s->max_frames_per_packet;
|
|
int len, max_packet_size = s->max_payload_size - max_au_headers_size;
|
|
uint8_t *p;
|
|
|
|
/* skip ADTS header, if present */
|
|
if ((s1->streams[0]->codec->extradata_size) == 0) {
|
|
size -= 7;
|
|
buff += 7;
|
|
}
|
|
|
|
/* test if the packet must be sent */
|
|
len = (s->buf_ptr - s->buf);
|
|
if (s->num_frames &&
|
|
(s->num_frames == s->max_frames_per_packet ||
|
|
(len + size) > s->max_payload_size ||
|
|
av_compare_ts(s->cur_timestamp - s->timestamp, st->time_base,
|
|
s1->max_delay, AV_TIME_BASE_Q) >= 0)) {
|
|
int au_size = s->num_frames * 2;
|
|
|
|
p = s->buf + max_au_headers_size - au_size - 2;
|
|
if (p != s->buf) {
|
|
memmove(p + 2, s->buf + 2, au_size);
|
|
}
|
|
/* Write the AU header size */
|
|
AV_WB16(p, au_size * 8);
|
|
|
|
ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
|
|
|
|
s->num_frames = 0;
|
|
}
|
|
if (s->num_frames == 0) {
|
|
s->buf_ptr = s->buf + max_au_headers_size;
|
|
s->timestamp = s->cur_timestamp;
|
|
}
|
|
|
|
if (size <= max_packet_size) {
|
|
p = s->buf + s->num_frames++ * 2 + 2;
|
|
AV_WB16(p, size * 8);
|
|
memcpy(s->buf_ptr, buff, size);
|
|
s->buf_ptr += size;
|
|
} else {
|
|
int au_size = size;
|
|
|
|
max_packet_size = s->max_payload_size - 4;
|
|
p = s->buf;
|
|
AV_WB16(p, 2 * 8);
|
|
while (size > 0) {
|
|
len = FFMIN(size, max_packet_size);
|
|
AV_WB16(&p[2], au_size * 8);
|
|
memcpy(p + 4, buff, len);
|
|
ff_rtp_send_data(s1, p, len + 4, len == size);
|
|
size -= len;
|
|
buff += len;
|
|
}
|
|
}
|
|
}
|