mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
e9eb8d0bce
In the name of consistency:
put_byte -> avio_w8
put_<type> -> avio_w<type>
put_buffer -> avio_write
put_nbyte will be made private
put_tag will be merged with avio_put_str
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit 77eb5504d3
)
155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/*
|
|
* RTP VP8 Depacketizer
|
|
* Copyright (c) 2010 Josh Allmann
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @brief RTP support for the VP8 payload
|
|
* @author Josh Allmann <joshua.allmann@gmail.com>
|
|
* ( http://www.webmproject.org/code/specs/rtp/ )
|
|
*/
|
|
|
|
#include "libavcodec/bytestream.h"
|
|
|
|
#include "rtpdec_formats.h"
|
|
|
|
struct PayloadContext {
|
|
AVIOContext *data;
|
|
uint32_t timestamp;
|
|
int is_keyframe;
|
|
};
|
|
|
|
static void prepare_packet(AVPacket *pkt, PayloadContext *vp8, int stream)
|
|
{
|
|
av_init_packet(pkt);
|
|
pkt->stream_index = stream;
|
|
pkt->flags = vp8->is_keyframe ? AV_PKT_FLAG_KEY : 0;
|
|
pkt->size = url_close_dyn_buf(vp8->data, &pkt->data);
|
|
pkt->destruct = av_destruct_packet;
|
|
vp8->data = NULL;
|
|
}
|
|
|
|
static int vp8_handle_packet(AVFormatContext *ctx,
|
|
PayloadContext *vp8,
|
|
AVStream *st,
|
|
AVPacket *pkt,
|
|
uint32_t *timestamp,
|
|
const uint8_t *buf,
|
|
int len, int flags)
|
|
{
|
|
int start_packet, end_packet, has_au, ret = AVERROR(EAGAIN);
|
|
|
|
if (!buf) {
|
|
// only called when vp8_handle_packet returns 1
|
|
if (!vp8->data) {
|
|
av_log(ctx, AV_LOG_ERROR, "Invalid VP8 data passed\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
prepare_packet(pkt, vp8, st->index);
|
|
*timestamp = vp8->timestamp;
|
|
return 0;
|
|
}
|
|
|
|
start_packet = *buf & 1;
|
|
end_packet = flags & RTP_FLAG_MARKER;
|
|
has_au = *buf & 2;
|
|
buf++;
|
|
len--;
|
|
|
|
if (start_packet) {
|
|
int res;
|
|
uint32_t ts = *timestamp;
|
|
if (vp8->data) {
|
|
// missing end marker; return old frame anyway. untested
|
|
prepare_packet(pkt, vp8, st->index);
|
|
*timestamp = vp8->timestamp; // reset timestamp from old frame
|
|
|
|
// if current frame fits into one rtp packet, need to hold
|
|
// that for the next av_get_packet call
|
|
ret = end_packet ? 1 : 0;
|
|
}
|
|
if ((res = url_open_dyn_buf(&vp8->data)) < 0)
|
|
return res;
|
|
vp8->is_keyframe = *buf & 1;
|
|
vp8->timestamp = ts;
|
|
}
|
|
|
|
if (!vp8->data || vp8->timestamp != *timestamp && ret == AVERROR(EAGAIN)) {
|
|
av_log(ctx, AV_LOG_WARNING,
|
|
"Received no start marker; dropping frame\n");
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
// cycle through VP8AU headers if needed
|
|
// not tested with actual VP8AUs
|
|
while (len) {
|
|
int au_len = len;
|
|
if (has_au && len > 2) {
|
|
au_len = AV_RB16(buf);
|
|
buf += 2;
|
|
len -= 2;
|
|
if (buf + au_len > buf + len) {
|
|
av_log(ctx, AV_LOG_ERROR, "Invalid VP8AU length\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
avio_write(vp8->data, buf, au_len);
|
|
buf += au_len;
|
|
len -= au_len;
|
|
}
|
|
|
|
if (ret != AVERROR(EAGAIN)) // did we miss a end marker?
|
|
return ret;
|
|
|
|
if (end_packet) {
|
|
prepare_packet(pkt, vp8, st->index);
|
|
return 0;
|
|
}
|
|
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
static PayloadContext *vp8_new_context(void)
|
|
{
|
|
av_log(NULL, AV_LOG_ERROR, "RTP VP8 payload implementation is incompatible "
|
|
"with the latest spec drafts.\n");
|
|
return av_mallocz(sizeof(PayloadContext));
|
|
}
|
|
|
|
static void vp8_free_context(PayloadContext *vp8)
|
|
{
|
|
if (vp8->data) {
|
|
uint8_t *tmp;
|
|
url_close_dyn_buf(vp8->data, &tmp);
|
|
av_free(tmp);
|
|
}
|
|
av_free(vp8);
|
|
}
|
|
|
|
RTPDynamicProtocolHandler ff_vp8_dynamic_handler = {
|
|
.enc_name = "VP8",
|
|
.codec_type = AVMEDIA_TYPE_VIDEO,
|
|
.codec_id = CODEC_ID_VP8,
|
|
.open = vp8_new_context,
|
|
.close = vp8_free_context,
|
|
.parse_packet = vp8_handle_packet,
|
|
};
|