path: root/libavformat/rtpenc_vc2hq.c (plain)
blob: 085204fa646dc8c8aa2997be13bb5fd5521abbc4

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	{
38	RTPMuxContext *rtp_ctx = ctx->priv_data;
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	{
50	RTPMuxContext *rtp_ctx = ctx->priv_data;
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 */
70	get_interleaved_ue_golomb(&gc);
71	for(lvl = 0; lvl < wavelet_depth; lvl++)
72	{
73	get_interleaved_ue_golomb(&gc);
74	get_interleaved_ue_golomb(&gc);
75	get_interleaved_ue_golomb(&gc);
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
102	void ff_rtp_send_vc2hq(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size, int interlaced)
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 */
116	case DIRAC_PCODE_SEQ_HEADER:
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 */
121	case DIRAC_PCODE_PICTURE_HQ:
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	}
135