green是什么颜色

Line	Branch	Exec	Source
1			/*
2			* RTP packetization for H.263 video
3			* Copyright (c) 2012 Martin Storsjo
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 "avformat.h"
23			#include "rtpenc.h"
24			#include "libavcodec/put_bits.h"
25			#include "libavcodec/get_bits.h"
26
27			struct H263Info {
28			int src;
29			int i;
30			int u;
31			int s;
32			int a;
33			int pb;
34			int tr;
35			};
36
37			struct H263State {
38			int gobn;
39			int mba;
40			int hmv1, vmv1, hmv2, vmv2;
41			int quant;
42			};
43
44		✗	static void send_mode_a(AVFormatContext *s1, const struct H263Info *info,
45			const uint8_t *buf, int len, int ebits, int m)
46			{
47		✗	RTPMuxContext *s = s1->priv_data;
48			PutBitContext pb;
49
50		✗	init_put_bits(&pb, s->buf, 32);
51		✗	put_bits(&pb, 1, 0); /* F - 0, mode A */
52		✗	put_bits(&pb, 1, 0); /* P - 0, normal I/P */
53		✗	put_bits(&pb, 3, 0); /* SBIT - 0 bits */
54		✗	put_bits(&pb, 3, ebits); /* EBIT */
55		✗	put_bits(&pb, 3, info->src); /* SRC - source format */
56		✗	put_bits(&pb, 1, info->i); /* I - inter/intra */
57		✗	put_bits(&pb, 1, info->u); /* U - unrestricted motion vector */
58		✗	put_bits(&pb, 1, info->s); /* S - syntax-baesd arithmetic coding */
59		✗	put_bits(&pb, 1, info->a); /* A - advanced prediction */
60		✗	put_bits(&pb, 4, 0); /* R - reserved */
61		✗	put_bits(&pb, 2, 0); /* DBQ - 0 */
62		✗	put_bits(&pb, 3, 0); /* TRB - 0 */
63		✗	put_bits(&pb, 8, info->tr); /* TR */
64		✗	flush_put_bits(&pb);
65		✗	memcpy(s->buf + 4, buf, len);
66
67		✗	ff_rtp_send_data(s1, s->buf, len + 4, m);
68		✗	}
69
70		✗	static void send_mode_b(AVFormatContext *s1, const struct H263Info *info,
71			const struct H263State *state, const uint8_t *buf,
72			int len, int sbits, int ebits, int m)
73			{
74		✗	RTPMuxContext *s = s1->priv_data;
75			PutBitContext pb;
76
77		✗	init_put_bits(&pb, s->buf, 64);
78		✗	put_bits(&pb, 1, 1); /* F - 1, mode B */
79		✗	put_bits(&pb, 1, 0); /* P - 0, mode B */
80		✗	put_bits(&pb, 3, sbits); /* SBIT - 0 bits */
81		✗	put_bits(&pb, 3, ebits); /* EBIT - 0 bits */
82		✗	put_bits(&pb, 3, info->src); /* SRC - source format */
83		✗	put_bits(&pb, 5, state->quant); /* QUANT - quantizer for the first MB */
84		✗	put_bits(&pb, 5, state->gobn); /* GOBN - GOB number */
85		✗	put_bits(&pb, 9, state->mba); /* MBA - MB address */
86		✗	put_bits(&pb, 2, 0); /* R - reserved */
87		✗	put_bits(&pb, 1, info->i); /* I - inter/intra */
88		✗	put_bits(&pb, 1, info->u); /* U - unrestricted motion vector */
89		✗	put_bits(&pb, 1, info->s); /* S - syntax-baesd arithmetic coding */
90		✗	put_bits(&pb, 1, info->a); /* A - advanced prediction */
91		✗	put_bits(&pb, 7, state->hmv1); /* HVM1 - horizontal motion vector 1 */
92		✗	put_bits(&pb, 7, state->vmv1); /* VMV1 - vertical motion vector 1 */
93		✗	put_bits(&pb, 7, state->hmv2); /* HVM2 - horizontal motion vector 2 */
94		✗	put_bits(&pb, 7, state->vmv2); /* VMV2 - vertical motion vector 2 */
95		✗	flush_put_bits(&pb);
96		✗	memcpy(s->buf + 8, buf, len);
97
98		✗	ff_rtp_send_data(s1, s->buf, len + 8, m);
99		✗	}
100
101		✗	void ff_rtp_send_h263_rfc2190(AVFormatContext *s1, const uint8_t *buf, int size,
102			const uint8_t *mb_info, int mb_info_size)
103			{
104		✗	RTPMuxContext *s = s1->priv_data;
105		✗	int len, sbits = 0, ebits = 0;
106			GetBitContext gb;
107		✗	struct H263Info info = { 0 };
108		✗	struct H263State state = { 0 };
109		✗	int mb_info_pos = 0, mb_info_count = mb_info_size / 12;
110		✗	const uint8_t *buf_base = buf;
111
112		✗	s->timestamp = s->cur_timestamp;
113
114		✗	init_get_bits(&gb, buf, size*8);
115		✗	if (get_bits(&gb, 22) == 0x20) { /* Picture Start Code */
116		✗	info.tr = get_bits(&gb, 8);
117		✗	skip_bits(&gb, 2); /* PTYPE start, H.261 disambiguation */
118		✗	skip_bits(&gb, 3); /* Split screen, document camera, freeze picture release */
119		✗	info.src = get_bits(&gb, 3);
120		✗	info.i = get_bits(&gb, 1);
121		✗	info.u = get_bits(&gb, 1);
122		✗	info.s = get_bits(&gb, 1);
123		✗	info.a = get_bits(&gb, 1);
124		✗	info.pb = get_bits(&gb, 1);
125			}
126
127		✗	while (size > 0) {
128		✗	struct H263State packet_start_state = state;
129		✗	len = FFMIN(s->max_payload_size - 8, size);
130
131			/* Look for a better place to split the frame into packets. */
132		✗	if (len < size) {
133		✗	const uint8_t *end = ff_h263_find_resync_marker_reverse(buf,
134			buf + len);
135		✗	len = end - buf;
136		✗	if (len == s->max_payload_size - 8) {
137			/* Skip mb info prior to the start of the current ptr */
138		✗	while (mb_info_pos < mb_info_count) {
139		✗	uint32_t pos = AV_RL32(&mb_info[12*mb_info_pos])/8;
140		✗	if (pos >= buf - buf_base)
141		✗	break;
142		✗	mb_info_pos++;
143			}
144			/* Find the first mb info past the end pointer */
145		✗	while (mb_info_pos + 1 < mb_info_count) {
146		✗	uint32_t pos = AV_RL32(&mb_info[12*(mb_info_pos + 1)])/8;
147		✗	if (pos >= end - buf_base)
148		✗	break;
149		✗	mb_info_pos++;
150			}
151		✗	if (mb_info_pos < mb_info_count) {
152		✗	const uint8_t *ptr = &mb_info[12*mb_info_pos];
153			/* get position in bits in the input packet at which the next info block should be used */
154		✗	uint32_t bit_pos = AV_RL32(ptr);
155			/* get position in bytes */
156		✗	uint32_t pos_next_mb_info = (bit_pos + 7)/8;
157			/* check if data from the next MB info block should be used */
158		✗	if (pos_next_mb_info <= end - buf_base) {
159		✗	state.quant = ptr[4];
160		✗	state.gobn = ptr[5];
161		✗	state.mba = AV_RL16(&ptr[6]);
162		✗	state.hmv1 = (int8_t) ptr[8];
163		✗	state.vmv1 = (int8_t) ptr[9];
164		✗	state.hmv2 = (int8_t) ptr[10];
165		✗	state.vmv2 = (int8_t) ptr[11];
166		✗	ebits = 8 * pos_next_mb_info - bit_pos;
167		✗	len = pos_next_mb_info - (buf - buf_base);
168		✗	mb_info_pos++;
169			}
170			} else {
171		✗	av_log(s1, AV_LOG_ERROR, "Unable to split H.263 packet, "
172			"use -mb_info %d or -ps 1.\n",
173		✗	s->max_payload_size - 8);
174			}
175			}
176			}
177
178		✗	if (size > 2 && !buf[0] && !buf[1])
179		✗	send_mode_a(s1, &info, buf, len, ebits, len == size);
180			else
181		✗	send_mode_b(s1, &info, &packet_start_state, buf, len, sbits,
182			ebits, len == size);
183
184		✗	if (ebits) {
185		✗	sbits = 8 - ebits;
186		✗	len--;
187			} else {
188		✗	sbits = 0;
189			}
190		✗	buf += len;
191		✗	size -= len;
192		✗	ebits = 0;
193			}
194		✗	}
195