mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
a61d190972
Signed-off-by: Kyle Schwarz <zeranoe@gmail.com>
237 lines
6.8 KiB
C
237 lines
6.8 KiB
C
/*
|
|
* RTP Depacketization of RAW video (TR-03)
|
|
* Copyright (c) 2016 Savoir-faire Linux, Inc
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/* Development sponsored by CBC/Radio-Canada */
|
|
|
|
#include "avio_internal.h"
|
|
#include "rtpdec_formats.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/pixdesc.h"
|
|
|
|
struct PayloadContext {
|
|
char *sampling;
|
|
int depth;
|
|
int width;
|
|
int height;
|
|
|
|
uint8_t *frame;
|
|
unsigned int frame_size;
|
|
unsigned int pgroup; /* size of the pixel group in bytes */
|
|
unsigned int xinc;
|
|
|
|
uint32_t timestamp;
|
|
};
|
|
|
|
static int rfc4175_parse_format(AVStream *stream, PayloadContext *data)
|
|
{
|
|
enum AVPixelFormat pixfmt = AV_PIX_FMT_NONE;
|
|
int bits_per_sample = 0;
|
|
int tag = 0;
|
|
|
|
if (!strncmp(data->sampling, "YCbCr-4:2:2", 11)) {
|
|
tag = MKTAG('U', 'Y', 'V', 'Y');
|
|
data->xinc = 2;
|
|
|
|
if (data->depth == 8) {
|
|
data->pgroup = 4;
|
|
bits_per_sample = 16;
|
|
pixfmt = AV_PIX_FMT_UYVY422;
|
|
} else if (data->depth == 10) {
|
|
data->pgroup = 5;
|
|
bits_per_sample = 20;
|
|
pixfmt = AV_PIX_FMT_YUV422P10;
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
stream->codecpar->format = pixfmt;
|
|
stream->codecpar->codec_tag = tag;
|
|
stream->codecpar->bits_per_coded_sample = bits_per_sample;
|
|
data->frame_size = data->width * data->height * data->pgroup / data->xinc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rfc4175_parse_fmtp(AVFormatContext *s, AVStream *stream,
|
|
PayloadContext *data, const char *attr,
|
|
const char *value)
|
|
{
|
|
if (!strncmp(attr, "width", 5))
|
|
data->width = atoi(value);
|
|
else if (!strncmp(attr, "height", 6))
|
|
data->height = atoi(value);
|
|
else if (!strncmp(attr, "sampling", 8))
|
|
data->sampling = av_strdup(value);
|
|
else if (!strncmp(attr, "depth", 5))
|
|
data->depth = atoi(value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rfc4175_parse_sdp_line(AVFormatContext *s, int st_index,
|
|
PayloadContext *data, const char *line)
|
|
{
|
|
const char *p;
|
|
|
|
if (st_index < 0)
|
|
return 0;
|
|
|
|
if (av_strstart(line, "fmtp:", &p)) {
|
|
AVStream *stream = s->streams[st_index];
|
|
int ret = ff_parse_fmtp(s, stream, data, p, rfc4175_parse_fmtp);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
|
|
if (!data->sampling || !data->depth || !data->width || !data->height)
|
|
return -1;
|
|
|
|
stream->codecpar->width = data->width;
|
|
stream->codecpar->height = data->height;
|
|
|
|
ret = rfc4175_parse_format(stream, data);
|
|
av_freep(&data->sampling);
|
|
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rfc4175_finalize_packet(PayloadContext *data, AVPacket *pkt,
|
|
int stream_index)
|
|
{
|
|
int ret;
|
|
|
|
pkt->stream_index = stream_index;
|
|
ret = av_packet_from_data(pkt, data->frame, data->frame_size);
|
|
if (ret < 0) {
|
|
av_freep(&data->frame);
|
|
}
|
|
|
|
data->frame = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rfc4175_handle_packet(AVFormatContext *ctx, PayloadContext *data,
|
|
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
|
|
const uint8_t * buf, int len,
|
|
uint16_t seq, int flags)
|
|
{
|
|
int length, line, offset, cont;
|
|
const uint8_t *headers = buf + 2; /* skip extended seqnum */
|
|
const uint8_t *payload = buf + 2;
|
|
int payload_len = len - 2;
|
|
int missed_last_packet = 0;
|
|
|
|
uint8_t *dest;
|
|
|
|
if (*timestamp != data->timestamp) {
|
|
if (data->frame) {
|
|
/*
|
|
* if we're here, it means that two RTP packets didn't have the
|
|
* same timestamp, which is a sign that they were packets from two
|
|
* different frames, but we didn't get the flag RTP_FLAG_MARKER on
|
|
* the first one of these frames (last packet of a frame).
|
|
* Finalize the previous frame anyway by filling the AVPacket.
|
|
*/
|
|
av_log(ctx, AV_LOG_ERROR, "Missed previous RTP Marker\n");
|
|
missed_last_packet = 1;
|
|
rfc4175_finalize_packet(data, pkt, st->index);
|
|
}
|
|
|
|
data->frame = av_malloc(data->frame_size);
|
|
|
|
data->timestamp = *timestamp;
|
|
|
|
if (!data->frame) {
|
|
av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* looks for the 'Continuation bit' in scan lines' headers
|
|
* to find where data start
|
|
*/
|
|
do {
|
|
if (payload_len < 6)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
cont = payload[4] & 0x80;
|
|
payload += 6;
|
|
payload_len -= 6;
|
|
} while (cont);
|
|
|
|
/* and now iterate over every scan lines */
|
|
do {
|
|
int copy_offset;
|
|
|
|
if (payload_len < data->pgroup)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
length = (headers[0] << 8) | headers[1];
|
|
line = ((headers[2] & 0x7f) << 8) | headers[3];
|
|
offset = ((headers[4] & 0x7f) << 8) | headers[5];
|
|
cont = headers[4] & 0x80;
|
|
headers += 6;
|
|
|
|
if (!data->pgroup || length % data->pgroup)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (length > payload_len)
|
|
length = payload_len;
|
|
|
|
/* prevent ill-formed packets to write after buffer's end */
|
|
copy_offset = (line * data->width + offset) * data->pgroup / data->xinc;
|
|
if (copy_offset + length > data->frame_size)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
dest = data->frame + copy_offset;
|
|
memcpy(dest, payload, length);
|
|
|
|
payload += length;
|
|
payload_len -= length;
|
|
} while (cont);
|
|
|
|
if ((flags & RTP_FLAG_MARKER)) {
|
|
return rfc4175_finalize_packet(data, pkt, st->index);
|
|
} else if (missed_last_packet) {
|
|
return 0;
|
|
}
|
|
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
const RTPDynamicProtocolHandler ff_rfc4175_rtp_handler = {
|
|
.enc_name = "raw",
|
|
.codec_type = AVMEDIA_TYPE_VIDEO,
|
|
.codec_id = AV_CODEC_ID_BITPACKED,
|
|
.priv_data_size = sizeof(PayloadContext),
|
|
.parse_sdp_a_line = rfc4175_parse_sdp_line,
|
|
.parse_packet = rfc4175_handle_packet,
|
|
};
|