FFmpeg
rtpenc_vc2hq.c
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1 /*
2  * RTP packetizer for VC-2 HQ payload format (draft version 1) - experimental
3  * Copyright (c) 2016 Thomas Volkert <thomas@netzeal.de>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavcodec/dirac.h"
24 #include "libavcodec/get_bits.h"
25 #include "libavcodec/golomb.h"
26 
27 #include "avformat.h"
28 #include "rtpenc.h"
29 
30 #define RTP_VC2HQ_PL_HEADER_SIZE 4
31 
32 #define DIRAC_DATA_UNIT_HEADER_SIZE 13
33 #define DIRAC_PIC_NR_SIZE 4
34 #define DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT 0xEC
35 
36 static void send_packet(AVFormatContext *ctx, uint8_t parse_code, int info_hdr_size, const uint8_t *buf, int size, int i, int f, int rtp_m)
37 {
39 
40  AV_WB16(&rtp_ctx->buf[0], 0); /* extended sequence number */
41  AV_WB8 (&rtp_ctx->buf[2], i ? (f ? (0x03) : (0x02)) : 0x00); /* flags: interlaced, second field */
42  AV_WB8 (&rtp_ctx->buf[3], parse_code);
43  if (size > 0)
44  memcpy(&rtp_ctx->buf[4 + info_hdr_size], buf, size);
45  ff_rtp_send_data(ctx, rtp_ctx->buf, RTP_VC2HQ_PL_HEADER_SIZE + info_hdr_size + size, rtp_m);
46 }
47 
48 static void send_picture(AVFormatContext *ctx, const uint8_t *buf, int size, int interlaced)
49 {
51  GetBitContext gc;
52  int lvl, second_field;
53  uint32_t pic_nr, wavelet_depth, prefix_bytes, size_scaler;
54  uint16_t frag_len;
55  char *info_hdr = &rtp_ctx->buf[4];
56 
57  pic_nr = AV_RB32(&buf[0]);
58  buf += DIRAC_PIC_NR_SIZE;
59  size -= DIRAC_PIC_NR_SIZE;
60  second_field = interlaced && (pic_nr & 0x01);
61 
62  init_get_bits(&gc, buf, 8 * size);
63  get_interleaved_ue_golomb(&gc); /* wavelet_idx */
64  wavelet_depth = get_interleaved_ue_golomb(&gc);
65  get_interleaved_ue_golomb(&gc); /* num_x */
66  get_interleaved_ue_golomb(&gc); /* num_y */
67  prefix_bytes = get_interleaved_ue_golomb(&gc);
68  size_scaler = get_interleaved_ue_golomb(&gc);
69  /* pass the quantization matrices */
71  for(lvl = 0; lvl < wavelet_depth; lvl++)
72  {
76  }
77 
78  frag_len = (get_bits_count(&gc) + 7) / 8; /* length of transform parameters */
79 
80  AV_WB32(&info_hdr[ 0], pic_nr);
81  AV_WB16(&info_hdr[ 4], prefix_bytes);
82  AV_WB16(&info_hdr[ 6], size_scaler);
83  AV_WB16(&info_hdr[ 8], frag_len);
84  AV_WB16(&info_hdr[10], 0 /* nr. of slices */);
85  send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 12, buf, frag_len, interlaced, second_field, 0);
86  buf += frag_len;
87  size -= frag_len;
88 
89  while (size > 0) {
90  frag_len = FFMIN(rtp_ctx->max_payload_size - 20 /* pl header */, size);
91  AV_WB16(&info_hdr[ 8], frag_len);
92  AV_WB16(&info_hdr[10], 1 /* nr. of slices */);
93  AV_WB16(&info_hdr[12], 0 /* slice x */);
94  AV_WB16(&info_hdr[14], 0 /* slice y */);
95 
96  size -= frag_len;
97  send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 16, buf, frag_len, interlaced, second_field, size > 0 ? 0 : 1);
98  buf += frag_len;
99  }
100 }
101 
103 {
104  const uint8_t *end = frame_buf + frame_size;
105  const uint8_t *unit = frame_buf;
106  uint8_t parse_code;
107  uint32_t unit_size;
108 
109  while (unit < end) {
110  parse_code = unit[4];
111  unit_size = AV_RB32(&unit[5]);
112 
113  switch (parse_code) {
114  /* sequence header */
115  /* end of sequence */
117  case DIRAC_PCODE_END_SEQ:
118  send_packet(ctx, parse_code, 0, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, 0, 0, 0);
119  break;
120  /* HQ picture */
122  send_picture(ctx, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, interlaced);
123  break;
124  /* parse codes without specification */
125  case DIRAC_PCODE_AUX:
126  case DIRAC_PCODE_PAD:
127  break;
128  default:
129  avpriv_report_missing_feature(ctx, "VC-2 parse code %d", parse_code);
130  break;
131  }
132  unit += unit_size;
133  }
134 }
#define DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT
Definition: rtpenc_vc2hq.c:34
#define AV_WB8(p, d)
Definition: intreadwrite.h:396
int max_payload_size
Definition: rtpenc.h:38
static void send_picture(AVFormatContext *ctx, const uint8_t *buf, int size, int interlaced)
Definition: rtpenc_vc2hq.c:48
#define RTP_VC2HQ_PL_HEADER_SIZE
Definition: rtpenc_vc2hq.c:30
Format I/O context.
Definition: avformat.h:1358
uint8_t
Interface to Dirac Decoder/Encoder.
#define f(width, name)
Definition: cbs_vp9.c:255
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
bitstream reader API header.
uint8_t * buf
Definition: rtpenc.h:49
ptrdiff_t size
Definition: opengl_enc.c:100
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
#define DIRAC_PIC_NR_SIZE
Definition: rtpenc_vc2hq.c:33
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define DIRAC_DATA_UNIT_HEADER_SIZE
Definition: rtpenc_vc2hq.c:32
#define FFMIN(a, b)
Definition: common.h:96
uint8_t interlaced
Definition: mxfenc.c:2216
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m)
Definition: rtpenc.c:332
AVFormatContext * ctx
Definition: movenc.c:48
static void send_packet(AVFormatContext *ctx, uint8_t parse_code, int info_hdr_size, const uint8_t *buf, int size, int i, int f, int rtp_m)
Definition: rtpenc_vc2hq.c:36
int frame_size
Definition: mxfenc.c:2214
void * buf
Definition: avisynth_c.h:766
void ff_rtp_send_vc2hq(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size, int interlaced)
Definition: rtpenc_vc2hq.c:102
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
Main libavformat public API header.
void * priv_data
Format private data.
Definition: avformat.h:1386
static unsigned get_interleaved_ue_golomb(GetBitContext *gb)
Definition: golomb.h:143
exp golomb vlc stuff
AVFormatContext * rtp_ctx
Definition: rtpenc_mpegts.c:28