FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/opus_parser.c
Date: 2024-04-20 14:10:07
Exec Total Coverage
Lines: 68 89 76.4%
Functions: 3 3 100.0%
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 "libavutil/mem.h"
29 #include "avcodec.h"
30 #include "bytestream.h"
31 #include "opus.h"
32 #include "opus_parse.h"
33 #include "parser.h"
34
35 typedef struct OpusParserContext {
36 ParseContext pc;
37 OpusParseContext ctx;
38 OpusPacket pkt;
39 int extradata_parsed;
40 int ts_framing;
41 } OpusParserContext;
42
43 765 static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_len, int buf_len)
44 {
45 765 const uint8_t *buf = start + 1;
46 int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length;
47 uint8_t flags;
48 uint64_t payload_len_tmp;
49
50 GetByteContext gb;
51 765 bytestream2_init(&gb, buf, buf_len);
52
53 765 flags = bytestream2_get_byte(&gb);
54 765 start_trim_flag = (flags >> 4) & 1;
55 765 end_trim_flag = (flags >> 3) & 1;
56 765 control_extension_flag = (flags >> 2) & 1;
57
58 765 payload_len_tmp = *payload_len = 0;
59
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2929 while (bytestream2_peek_byte(&gb) == 0xff)
60 2164 payload_len_tmp += bytestream2_get_byte(&gb);
61
62 765 payload_len_tmp += bytestream2_get_byte(&gb);
63
64
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765 if (start_trim_flag)
65 bytestream2_skip(&gb, 2);
66
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765 if (end_trim_flag)
67 bytestream2_skip(&gb, 2);
68
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765 if (control_extension_flag) {
69 control_extension_length = bytestream2_get_byte(&gb);
70 bytestream2_skip(&gb, control_extension_length);
71 }
72
73
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765 if (bytestream2_tell(&gb) + payload_len_tmp > buf_len)
74 return NULL;
75
76 765 *payload_len = payload_len_tmp;
77
78 765 return buf + bytestream2_tell(&gb);
79 }
80
81 /**
82 * Find the end of the current frame in the bitstream.
83 * @return the position of the first byte of the next frame, or -1
84 */
85 22878 static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
86 const uint8_t *buf, int buf_size, int *header_len)
87 {
88 22878 OpusParserContext *s = ctx->priv_data;
89 22878 ParseContext *pc = &s->pc;
90 22878 int ret, start_found, i = 0, payload_len = 0;
91 const uint8_t *payload;
92 uint32_t state;
93 uint16_t hdr;
94 22878 *header_len = 0;
95
96
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22878 if (!buf_size)
97 23 return 0;
98
99 22855 start_found = pc->frame_start_found;
100 22855 state = pc->state;
101 22855 payload = buf;
102
103 /* Check if we're using Opus in MPEG-TS framing */
104
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22855 if (!s->ts_framing && buf_size > 2) {
105 22092 hdr = AV_RB16(buf);
106
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22092 if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER)
107 2 s->ts_framing = 1;
108 }
109
110
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22855 if (s->ts_framing && !start_found) {
111
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1530 for (i = 0; i < buf_size-2; i++) {
112 1530 state = (state << 8) | payload[i];
113
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1530 if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
114 765 payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
115
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765 if (!payload) {
116 av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg TS header.\n");
117 return AVERROR_INVALIDDATA;
118 }
119 765 *header_len = payload - buf;
120 765 start_found = 1;
121 765 break;
122 }
123 }
124 }
125
126
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22855 if (!s->ts_framing)
127 22090 payload_len = buf_size;
128
129
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22855 if (avctx->extradata && !s->extradata_parsed) {
130 48 ret = ff_opus_parse_extradata(avctx, &s->ctx);
131
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48 if (ret < 0) {
132 av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
133 return AVERROR_INVALIDDATA;
134 }
135 48 av_freep(&s->ctx.channel_maps);
136 48 s->extradata_parsed = 1;
137 }
138
139
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22855 if (payload_len <= buf_size && (!s->ts_framing || start_found)) {
140 22855 ret = ff_opus_parse_packet(&s->pkt, payload, payload_len, s->ctx.nb_streams > 1);
141
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22855 if (ret < 0) {
142 av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
143 pc->frame_start_found = 0;
144 return AVERROR_INVALIDDATA;
145 }
146
147 22855 ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
148 }
149
150
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22855 if (s->ts_framing) {
151
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765 if (start_found) {
152
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765 if (payload_len + *header_len <= buf_size) {
153 765 pc->frame_start_found = 0;
154 765 pc->state = -1;
155 765 return payload_len + *header_len;
156 }
157 }
158
159 pc->frame_start_found = start_found;
160 pc->state = state;
161 return END_NOT_FOUND;
162 }
163
164 22090 return buf_size;
165 }
166
167 22878 static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
168 const uint8_t **poutbuf, int *poutbuf_size,
169 const uint8_t *buf, int buf_size)
170 {
171 22878 OpusParserContext *s = ctx->priv_data;
172 22878 ParseContext *pc = &s->pc;
173 int next, header_len;
174
175 22878 next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len);
176
177
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23644 if (s->ts_framing && next != AVERROR_INVALIDDATA &&
178 766 ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
179 *poutbuf = NULL;
180 *poutbuf_size = 0;
181 return buf_size;
182 }
183
184
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22878 if (next == AVERROR_INVALIDDATA){
185 *poutbuf = NULL;
186 *poutbuf_size = 0;
187 return buf_size;
188 }
189
190 22878 *poutbuf = buf + header_len;
191 22878 *poutbuf_size = buf_size - header_len;
192 22878 return next;
193 }
194
195 const AVCodecParser ff_opus_parser = {
196 .codec_ids = { AV_CODEC_ID_OPUS },
197 .priv_data_size = sizeof(OpusParserContext),
198 .parser_parse = opus_parse,
199 .parser_close = ff_parse_close
200 };
201