FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/opus/parser.c
Date: 2025-01-20 09:27:23
Exec Total Coverage
Lines: 81 99 81.8%
Functions: 4 4 100.0%
Branches: 40 64 62.5%
Line Branch Exec Source
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 "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 22877 static int set_frame_duration(AVCodecParserContext *ctx, AVCodecContext *avctx,
82 const uint8_t *buf, int buf_size)
83 {
84 22877 OpusParserContext *s = ctx->priv_data;
85
86
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 22877 if (ff_opus_parse_packet(&s->pkt, buf, buf_size, s->ctx.nb_streams > 1) < 0) {
87 22 av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
88 22 return AVERROR_INVALIDDATA;
89 }
90
91 22855 ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
92
93 22855 return 0;
94 }
95
96 /**
97 * Find the end of the current frame in the bitstream.
98 * @return the position of the first byte of the next frame, or -1
99 */
100 766 static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
101 const uint8_t *buf, int buf_size, int *header_len)
102 {
103 766 OpusParserContext *s = ctx->priv_data;
104 766 ParseContext *pc = &s->pc;
105 766 int ret, start_found, i = 0, payload_len = 0;
106 const uint8_t *payload;
107 uint32_t state;
108 uint16_t hdr;
109 766 *header_len = 0;
110
111
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 766 if (!buf_size)
112 1 return 0;
113
114 765 start_found = pc->frame_start_found;
115 765 state = pc->state;
116 765 payload = buf;
117
118 /* Check if we're using Opus in MPEG-TS framing */
119
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 765 if (!s->ts_framing && buf_size > 2) {
120 2 hdr = AV_RB16(buf);
121
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 2 if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER)
122 2 s->ts_framing = 1;
123 }
124
125
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 765 if (s->ts_framing && !start_found) {
126
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 1530 for (i = 0; i < buf_size-2; i++) {
127 1530 state = (state << 8) | payload[i];
128
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 1530 if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
129 765 payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
130
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 765 if (!payload) {
131 ✗ av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg TS header.\n");
132 ✗ return AVERROR_INVALIDDATA;
133 }
134 765 *header_len = payload - buf;
135 765 start_found = 1;
136 765 break;
137 }
138 }
139 }
140
141
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 765 if (!s->ts_framing)
142 ✗ payload_len = buf_size;
143
144
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 765 if (payload_len <= buf_size && (!s->ts_framing || start_found)) {
145 765 ret = set_frame_duration(ctx, avctx, payload, payload_len);
146
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 765 if (ret < 0) {
147 ✗ pc->frame_start_found = 0;
148 ✗ return AVERROR_INVALIDDATA;
149 }
150 }
151
152
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 765 if (s->ts_framing) {
153
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 765 if (start_found) {
154
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 765 if (payload_len + *header_len <= buf_size) {
155 765 pc->frame_start_found = 0;
156 765 pc->state = -1;
157 765 return payload_len + *header_len;
158 }
159 }
160
161 ✗ pc->frame_start_found = start_found;
162 ✗ pc->state = state;
163 ✗ return END_NOT_FOUND;
164 }
165
166 ✗ return buf_size;
167 }
168
169 22878 static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
170 const uint8_t **poutbuf, int *poutbuf_size,
171 const uint8_t *buf, int buf_size)
172 {
173 22878 OpusParserContext *s = ctx->priv_data;
174 22878 ParseContext *pc = &s->pc;
175 22878 int next, header_len = 0;
176
177 22878 avctx->sample_rate = 48000;
178
179
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 22878 if (avctx->extradata && !s->extradata_parsed) {
180
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 48 if (ff_opus_parse_extradata(avctx, &s->ctx) < 0) {
181 ✗ av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
182 ✗ goto fail;
183 }
184 48 av_freep(&s->ctx.channel_maps);
185 48 s->extradata_parsed = 1;
186 }
187
188
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 22878 if (ctx->flags & PARSER_FLAG_COMPLETE_FRAMES) {
189 22112 next = buf_size;
190
191
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 22112 if (set_frame_duration(ctx, avctx, buf, buf_size) < 0)
192 22 goto fail;
193 } else {
194 766 next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len);
195
196
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 1532 if (s->ts_framing && next != AVERROR_INVALIDDATA &&
197 766 ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
198 ✗ goto fail;
199 }
200
201
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 766 if (next == AVERROR_INVALIDDATA){
202 ✗ goto fail;
203 }
204 }
205
206 22856 *poutbuf = buf + header_len;
207 22856 *poutbuf_size = buf_size - header_len;
208 22856 return next;
209
210 22 fail:
211 22 *poutbuf = NULL;
212 22 *poutbuf_size = 0;
213 22 return buf_size;
214 }
215
216 const AVCodecParser ff_opus_parser = {
217 .codec_ids = { AV_CODEC_ID_OPUS },
218 .priv_data_size = sizeof(OpusParserContext),
219 .parser_parse = opus_parse,
220 .parser_close = ff_parse_close
221 };
222