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FFmpeg/libavformat/prompeg.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Pro-MPEG Code of Practice #3 Release 2 FEC
* Copyright (c) 2016 Mobibase, France (http://www.mobibase.com)
*
* 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
* Pro-MPEG Code of Practice #3 Release 2 FEC protocol
* @author Vlad Tarca <vlad.tarca@gmail.com>
*/
/*
* Reminder:
[RFC 2733] FEC Packet Structure
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RTP Header |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FEC Header |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FEC Payload |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
[RFC 3550] RTP header
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X| CC |M| PT | sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| synchronization source (SSRC) identifier |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
| contributing source (CSRC) identifiers |
| .... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
[RFC 3550] RTP header extension (after CSRC)
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| defined by profile | length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| header extension |
| .... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
[Pro-MPEG COP3] FEC Header
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SNBase low bits | length recovery |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|E| PT recovery | mask |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TS recovery |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|X|D|type |index| offset | NA |SNBase ext bits|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "avformat.h"
#include "config.h"
#include "url.h"
#define PROMPEG_RTP_PT 0x60
#define PROMPEG_FEC_COL 0x0
#define PROMPEG_FEC_ROW 0x1
typedef struct PrompegFec {
uint16_t sn;
uint32_t ts;
uint8_t *bitstring;
} PrompegFec;
typedef struct PrompegContext {
const AVClass *class;
URLContext *fec_col_hd, *fec_row_hd;
PrompegFec **fec_arr, **fec_col_tmp, **fec_col, *fec_row;
int ttl;
uint8_t l, d;
uint8_t *rtp_buf;
uint16_t rtp_col_sn, rtp_row_sn;
uint16_t length_recovery;
int packet_size;
int packet_idx, packet_idx_max;
int fec_arr_len;
int bitstring_size;
int rtp_buf_size;
int init;
int first;
} PrompegContext;
#define OFFSET(x) offsetof(PrompegContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "ttl", "Time to live (in milliseconds, multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = E },
{ "l", "FEC L", OFFSET(l), AV_OPT_TYPE_INT, { .i64 = 5 }, 4, 20, .flags = E },
{ "d", "FEC D", OFFSET(d), AV_OPT_TYPE_INT, { .i64 = 5 }, 4, 20, .flags = E },
{ NULL }
};
static const AVClass prompeg_class = {
.class_name = "prompeg",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static void xor_fast(const uint8_t *in1, const uint8_t *in2, uint8_t *out, int size) {
int i, n, s;
#if HAVE_FAST_64BIT
uint64_t v1, v2;
n = size / sizeof (uint64_t);
s = n * sizeof (uint64_t);
for (i = 0; i < n; i++) {
v1 = AV_RN64A(in1);
v2 = AV_RN64A(in2);
AV_WN64A(out, v1 ^ v2);
in1 += 8;
in2 += 8;
out += 8;
}
#else
uint32_t v1, v2;
n = size / sizeof (uint32_t);
s = n * sizeof (uint32_t);
for (i = 0; i < n; i++) {
v1 = AV_RN32A(in1);
v2 = AV_RN32A(in2);
AV_WN32A(out, v1 ^ v2);
in1 += 4;
in2 += 4;
out += 4;
}
#endif
n = size - s;
for (i = 0; i < n; i++) {
out[i] = in1[i] ^ in2[i];
}
}
static int prompeg_create_bitstring(URLContext *h, const uint8_t *buf, int size,
uint8_t **bitstring) {
PrompegContext *s = h->priv_data;
uint8_t *b;
if (size < 12 || (buf[0] & 0xc0) != 0x80 || (buf[1] & 0x7f) != 0x21) {
av_log(h, AV_LOG_ERROR, "Unsupported stream format (expected MPEG-TS over RTP)\n");
return AVERROR(EINVAL);
}
if (size != s->packet_size) {
av_log(h, AV_LOG_ERROR, "The RTP packet size must be constant (set pkt_size)\n");
return AVERROR(EINVAL);
}
*bitstring = av_malloc(s->bitstring_size);
if (!*bitstring) {
av_log(h, AV_LOG_ERROR, "Failed to allocate the bitstring buffer\n");
return AVERROR(ENOMEM);
}
b = *bitstring;
// P, X, CC
b[0] = buf[0] & 0x3f;
// M, PT
b[1] = buf[1];
// Timestamp
b[2] = buf[4];
b[3] = buf[5];
b[4] = buf[6];
b[5] = buf[7];
/*
* length_recovery: the unsigned network-ordered sum of lengths of CSRC,
* padding, extension and media payload
*/
AV_WB16(b + 6, s->length_recovery);
// Payload
memcpy(b + 8, buf + 12, s->length_recovery);
return 0;
}
static int prompeg_write_fec(URLContext *h, PrompegFec *fec, uint8_t type) {
PrompegContext *s = h->priv_data;
URLContext *hd;
uint8_t *buf = s->rtp_buf; // zero-filled
uint8_t *b = fec->bitstring;
uint16_t sn;
int ret;
sn = type == PROMPEG_FEC_COL ? ++s->rtp_col_sn : ++s->rtp_row_sn;
// V, P, X, CC
buf[0] = 0x80 | (b[0] & 0x3f);
// M, PT
buf[1] = (b[1] & 0x80) | PROMPEG_RTP_PT;
// SN
AV_WB16(buf + 2, sn);
// TS
AV_WB32(buf + 4, fec->ts);
// CSRC=0
//AV_WB32(buf + 8, 0);
// SNBase low bits
AV_WB16(buf + 12, fec->sn);
// Length recovery
buf[14] = b[6];
buf[15] = b[7];
// E=1, PT recovery
buf[16] = 0x80 | b[1];
// Mask=0
//buf[17] = 0x0;
//buf[18] = 0x0;
//buf[19] = 0x0;
// TS recovery
buf[20] = b[2];
buf[21] = b[3];
buf[22] = b[4];
buf[23] = b[5];
// X=0, D, type=0, index=0
buf[24] = type == PROMPEG_FEC_COL ? 0x0 : 0x40;
// offset
buf[25] = type == PROMPEG_FEC_COL ? s->l : 0x1;
// NA
buf[26] = type == PROMPEG_FEC_COL ? s->d : s->l;
// SNBase ext bits=0
//buf[27] = 0x0;
// Payload
memcpy(buf + 28, b + 8, s->length_recovery);
hd = type == PROMPEG_FEC_COL ? s->fec_col_hd : s->fec_row_hd;
ret = ffurl_write(hd, buf, s->rtp_buf_size);
return ret;
}
static int prompeg_open(URLContext *h, const char *uri, int flags) {
PrompegContext *s = h->priv_data;
AVDictionary *udp_opts = NULL;
int rtp_port;
char hostname[256];
char buf[1024];
s->fec_col_hd = NULL;
s->fec_row_hd = NULL;
if (s->l * s->d > 100) {
av_log(h, AV_LOG_ERROR, "L * D must be <= 100\n");
return AVERROR(EINVAL);
}
av_url_split(NULL, 0, NULL, 0, hostname, sizeof (hostname), &rtp_port,
NULL, 0, uri);
if (rtp_port < 1 || rtp_port > UINT16_MAX - 4) {
av_log(h, AV_LOG_ERROR, "Invalid RTP base port %d\n", rtp_port);
return AVERROR(EINVAL);
}
if (s->ttl > 0) {
av_dict_set_int(&udp_opts, "ttl", s->ttl, 0);
}
ff_url_join(buf, sizeof (buf), "udp", NULL, hostname, rtp_port + 2, NULL);
if (ffurl_open_whitelist(&s->fec_col_hd, buf, flags, &h->interrupt_callback,
&udp_opts, h->protocol_whitelist, h->protocol_blacklist, h) < 0)
goto fail;
ff_url_join(buf, sizeof (buf), "udp", NULL, hostname, rtp_port + 4, NULL);
if (ffurl_open_whitelist(&s->fec_row_hd, buf, flags, &h->interrupt_callback,
&udp_opts, h->protocol_whitelist, h->protocol_blacklist, h) < 0)
goto fail;
h->max_packet_size = s->fec_col_hd->max_packet_size;
s->init = 1;
av_dict_free(&udp_opts);
av_log(h, AV_LOG_INFO, "ProMPEG CoP#3-R2 FEC L=%d D=%d\n", s->l, s->d);
return 0;
fail:
ffurl_closep(&s->fec_col_hd);
ffurl_closep(&s->fec_row_hd);
av_dict_free(&udp_opts);
return AVERROR(EIO);
}
static int prompeg_init(URLContext *h, const uint8_t *buf, int size) {
PrompegContext *s = h->priv_data;
uint32_t seed;
int i;
s->fec_arr = NULL;
s->rtp_buf = NULL;
if (size < 12 || size > UINT16_MAX + 12) {
av_log(h, AV_LOG_ERROR, "Invalid RTP packet size\n");
return AVERROR_INVALIDDATA;
}
s->packet_idx = 0;
s->packet_idx_max = s->l * s->d;
s->packet_size = size;
s->length_recovery = size - 12;
s->rtp_buf_size = 28 + s->length_recovery; // 12 + 16: RTP + FEC headers
s->bitstring_size = 8 + s->length_recovery; // 8: P, X, CC, M, PT, SN, TS
s->fec_arr_len = 1 + 2 * s->l; // row + column tmp + column out
if (h->flags & AVFMT_FLAG_BITEXACT) {
s->rtp_col_sn = 0;
s->rtp_row_sn = 0;
} else {
seed = av_get_random_seed();
s->rtp_col_sn = seed & 0x0fff;
s->rtp_row_sn = (seed >> 16) & 0x0fff;
}
s->fec_arr = av_malloc_array(s->fec_arr_len, sizeof (PrompegFec*));
if (!s->fec_arr) {
goto fail;
}
for (i = 0; i < s->fec_arr_len; i++) {
s->fec_arr[i] = av_malloc(sizeof (PrompegFec));
if (!s->fec_arr[i]) {
goto fail;
}
s->fec_arr[i]->bitstring = av_malloc_array(s->bitstring_size, sizeof (uint8_t));
if (!s->fec_arr[i]->bitstring) {
av_freep(&s->fec_arr[i]);
goto fail;
}
}
s->fec_row = *s->fec_arr;
s->fec_col = s->fec_arr + 1;
s->fec_col_tmp = s->fec_arr + 1 + s->l;
s->rtp_buf = av_malloc_array(s->rtp_buf_size, sizeof (uint8_t));
if (!s->rtp_buf) {
goto fail;
}
memset(s->rtp_buf, 0, s->rtp_buf_size);
s->init = 0;
s->first = 1;
return 0;
fail:
av_log(h, AV_LOG_ERROR, "Failed to allocate the FEC buffer\n");
return AVERROR(ENOMEM);
}
static int prompeg_write(URLContext *h, const uint8_t *buf, int size) {
PrompegContext *s = h->priv_data;
PrompegFec *fec_tmp;
uint8_t *bitstring = NULL;
int col_idx, col_out_idx, row_idx;
int ret = 0;
if (s->init && ((ret = prompeg_init(h, buf, size)) < 0))
goto end;
if ((ret = prompeg_create_bitstring(h, buf, size, &bitstring)) < 0)
goto end;
col_idx = s->packet_idx % s->l;
row_idx = s->packet_idx / s->l % s->d;
// FEC' (row) send block-aligned, xor
if (col_idx == 0) {
if (!s->first || s->packet_idx > 0) {
if ((ret = prompeg_write_fec(h, s->fec_row, PROMPEG_FEC_ROW)) < 0)
goto end;
}
memcpy(s->fec_row->bitstring, bitstring, s->bitstring_size);
s->fec_row->sn = AV_RB16(buf + 2);
s->fec_row->ts = AV_RB32(buf + 4);
} else {
xor_fast(s->fec_row->bitstring, bitstring, s->fec_row->bitstring,
s->bitstring_size);
}
// FEC (column) xor
if (row_idx == 0) {
if (!s->first) {
// swap fec_col and fec_col_tmp
fec_tmp = s->fec_col[col_idx];
s->fec_col[col_idx] = s->fec_col_tmp[col_idx];
s->fec_col_tmp[col_idx] = fec_tmp;
}
memcpy(s->fec_col_tmp[col_idx]->bitstring, bitstring, s->bitstring_size);
s->fec_col_tmp[col_idx]->sn = AV_RB16(buf + 2);
s->fec_col_tmp[col_idx]->ts = AV_RB32(buf + 4);
} else {
xor_fast(s->fec_col_tmp[col_idx]->bitstring, bitstring,
s->fec_col_tmp[col_idx]->bitstring, s->bitstring_size);
}
// FEC (column) send block-aligned
if (!s->first && s->packet_idx % s->d == 0) {
col_out_idx = s->packet_idx / s->d;
if ((ret = prompeg_write_fec(h, s->fec_col[col_out_idx], PROMPEG_FEC_COL)) < 0)
goto end;
}
if (++s->packet_idx >= s->packet_idx_max) {
s->packet_idx = 0;
if (s->first)
s->first = 0;
}
ret = size;
end:
av_free(bitstring);
return ret;
}
static int prompeg_close(URLContext *h) {
PrompegContext *s = h->priv_data;
int i;
ffurl_closep(&s->fec_col_hd);
ffurl_closep(&s->fec_row_hd);
if (s->fec_arr) {
for (i = 0; i < s->fec_arr_len; i++) {
av_free(s->fec_arr[i]->bitstring);
av_freep(&s->fec_arr[i]);
}
av_freep(&s->fec_arr);
}
av_freep(&s->rtp_buf);
return 0;
}
const URLProtocol ff_prompeg_protocol = {
.name = "prompeg",
.url_open = prompeg_open,
.url_write = prompeg_write,
.url_close = prompeg_close,
.priv_data_size = sizeof(PrompegContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.priv_data_class = &prompeg_class,
};
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