FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/opus_parser.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 68 89 76.4%
Branches: 40 58 69.0%

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1 /*
2 * Copyright (c) 2013-2014 Mozilla Corporation
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * Opus parser
24 *
25 * Determines the duration for each packet.
26 */
27
28 #include "avcodec.h"
29 #include "bytestream.h"
30 #include "opus.h"
31 #include "parser.h"
32
33 typedef struct OpusParseContext {
34 ParseContext pc;
35 OpusContext ctx;
36 OpusPacket pkt;
37 int extradata_parsed;
38 int ts_framing;
39 } OpusParseContext;
40
41 765 static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_len, int buf_len)
42 {
43 765 const uint8_t *buf = start + 1;
44 int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length;
45 uint8_t flags;
46 uint64_t payload_len_tmp;
47
48 GetByteContext gb;
49 765 bytestream2_init(&gb, buf, buf_len);
50
51 765 flags = bytestream2_get_byte(&gb);
52 765 start_trim_flag = (flags >> 4) & 1;
53 765 end_trim_flag = (flags >> 3) & 1;
54 765 control_extension_flag = (flags >> 2) & 1;
55
56 765 payload_len_tmp = *payload_len = 0;
57
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2929 while (bytestream2_peek_byte(&gb) == 0xff)
58 2164 payload_len_tmp += bytestream2_get_byte(&gb);
59
60 765 payload_len_tmp += bytestream2_get_byte(&gb);
61
62
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765 if (start_trim_flag)
63 bytestream2_skip(&gb, 2);
64
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765 if (end_trim_flag)
65 bytestream2_skip(&gb, 2);
66
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765 if (control_extension_flag) {
67 control_extension_length = bytestream2_get_byte(&gb);
68 bytestream2_skip(&gb, control_extension_length);
69 }
70
71
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765 if (bytestream2_tell(&gb) + payload_len_tmp > buf_len)
72 return NULL;
73
74 765 *payload_len = payload_len_tmp;
75
76 765 return buf + bytestream2_tell(&gb);
77 }
78
79 /**
80 * Find the end of the current frame in the bitstream.
81 * @return the position of the first byte of the next frame, or -1
82 */
83 22671 static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
84 const uint8_t *buf, int buf_size, int *header_len)
85 {
86 22671 OpusParseContext *s = ctx->priv_data;
87 22671 ParseContext *pc = &s->pc;
88 22671 int ret, start_found, i = 0, payload_len = 0;
89 const uint8_t *payload;
90 uint32_t state;
91 uint16_t hdr;
92 22671 *header_len = 0;
93
94
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22671 if (!buf_size)
95 19 return 0;
96
97 22652 start_found = pc->frame_start_found;
98 22652 state = pc->state;
99 22652 payload = buf;
100
101 /* Check if we're using Opus in MPEG-TS framing */
102
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22652 if (!s->ts_framing && buf_size > 2) {
103 21889 hdr = AV_RB16(buf);
104
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21889 if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER)
105 2 s->ts_framing = 1;
106 }
107
108
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22652 if (s->ts_framing && !start_found) {
109
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1530 for (i = 0; i < buf_size-2; i++) {
110 1530 state = (state << 8) | payload[i];
111
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1530 if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
112 765 payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
113
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765 if (!payload) {
114 av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg TS header.\n");
115 return AVERROR_INVALIDDATA;
116 }
117 765 *header_len = payload - buf;
118 765 start_found = 1;
119 765 break;
120 }
121 }
122 }
123
124
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22652 if (!s->ts_framing)
125 21887 payload_len = buf_size;
126
127
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22652 if (avctx->extradata && !s->extradata_parsed) {
128 42 ret = ff_opus_parse_extradata(avctx, &s->ctx);
129
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42 if (ret < 0) {
130 av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
131 return AVERROR_INVALIDDATA;
132 }
133 42 av_freep(&s->ctx.channel_maps);
134 42 s->extradata_parsed = 1;
135 }
136
137
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22652 if (payload_len <= buf_size && (!s->ts_framing || start_found)) {
138 22652 ret = ff_opus_parse_packet(&s->pkt, payload, payload_len, s->ctx.nb_streams > 1);
139
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22652 if (ret < 0) {
140 av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
141 pc->frame_start_found = 0;
142 return AVERROR_INVALIDDATA;
143 }
144
145 22652 ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
146 }
147
148
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22652 if (s->ts_framing) {
149
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765 if (start_found) {
150
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765 if (payload_len + *header_len <= buf_size) {
151 765 pc->frame_start_found = 0;
152 765 pc->state = -1;
153 765 return payload_len + *header_len;
154 }
155 }
156
157 pc->frame_start_found = start_found;
158 pc->state = state;
159 return END_NOT_FOUND;
160 }
161
162 21887 return buf_size;
163 }
164
165 22671 static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
166 const uint8_t **poutbuf, int *poutbuf_size,
167 const uint8_t *buf, int buf_size)
168 {
169 22671 OpusParseContext *s = ctx->priv_data;
170 22671 ParseContext *pc = &s->pc;
171 int next, header_len;
172
173 22671 next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len);
174
175
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23437 if (s->ts_framing && next != AVERROR_INVALIDDATA &&
176 766 ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
177 *poutbuf = NULL;
178 *poutbuf_size = 0;
179 return buf_size;
180 }
181
182
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22671 if (next == AVERROR_INVALIDDATA){
183 *poutbuf = NULL;
184 *poutbuf_size = 0;
185 return buf_size;
186 }
187
188 22671 *poutbuf = buf + header_len;
189 22671 *poutbuf_size = buf_size - header_len;
190 22671 return next;
191 }
192
193 const AVCodecParser ff_opus_parser = {
194 .codec_ids = { AV_CODEC_ID_OPUS },
195 .priv_data_size = sizeof(OpusParseContext),
196 .parser_parse = opus_parse,
197 .parser_close = ff_parse_close
198 };
199