FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/pva.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 81 121 66.9%
Functions: 5 6 83.3%
Branches: 40 86 46.5%
Line Branch Exec Source
1 /*
2 * TechnoTrend PVA (.pva) demuxer
3 * Copyright (c) 2007, 2008 Ivo van Poorten
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 "avio_internal.h"
24 #include "demux.h"
25 #include "internal.h"
26 #include "mpeg.h"
27
28 #define PVA_MAX_PAYLOAD_LENGTH 0x17f8
29 #define PVA_VIDEO_PAYLOAD 0x01
30 #define PVA_AUDIO_PAYLOAD 0x02
31 #define PVA_MAGIC (('A' << 8) + 'V')
32
33 typedef struct PVAContext {
34 int continue_pes;
35 } PVAContext;
36
37 7187 static int pva_check(const uint8_t *p) {
38 7187 int length = AV_RB16(p + 6);
39
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 7187 if (AV_RB16(p) != PVA_MAGIC || !p[2] || p[2] > 2 || p[4] != 0x55 ||
40
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 4 (p[5] & 0xe0) || length > PVA_MAX_PAYLOAD_LENGTH)
41 7183 return -1;
42 4 return length + 8;
43 }
44
45 7186 static int pva_probe(const AVProbeData * pd) {
46 7186 const unsigned char *buf = pd->buf;
47 7186 int len = pva_check(buf);
48
49
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 7186 if (len < 0)
50 7183 return 0;
51
52
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 4 if (pd->buf_size >= len + 8 &&
53 1 pva_check(buf + len) >= 0)
54 1 return AVPROBE_SCORE_EXTENSION;
55
56 2 return AVPROBE_SCORE_MAX / 4;
57 }
58
59 1 static int pva_read_header(AVFormatContext *s) {
60 AVStream *st;
61
62
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 1 if (!(st = avformat_new_stream(s, NULL)))
63 ✗ return AVERROR(ENOMEM);
64 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
65 1 st->codecpar->codec_id = AV_CODEC_ID_MPEG2VIDEO;
66 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
67 1 avpriv_set_pts_info(st, 32, 1, 90000);
68 1 av_add_index_entry(st, 0, 0, 0, 0, AVINDEX_KEYFRAME);
69
70
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 1 if (!(st = avformat_new_stream(s, NULL)))
71 ✗ return AVERROR(ENOMEM);
72 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
73 1 st->codecpar->codec_id = AV_CODEC_ID_MP2;
74 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
75 1 avpriv_set_pts_info(st, 33, 1, 90000);
76 1 av_add_index_entry(st, 0, 0, 0, 0, AVINDEX_KEYFRAME);
77
78 /* the parameters will be extracted from the compressed bitstream */
79 1 return 0;
80 }
81
82 #define pva_log if (read_packet) av_log
83
84 128 static int read_part_of_packet(AVFormatContext *s, int64_t *pts,
85 int *len, int *strid, int read_packet) {
86 128 AVIOContext *pb = s->pb;
87 128 PVAContext *pvactx = s->priv_data;
88 int syncword, streamid, reserved, flags, length, pts_flag;
89 128 int64_t pva_pts = AV_NOPTS_VALUE, startpos;
90 int ret;
91
92 128 recover:
93 128 startpos = avio_tell(pb);
94
95 128 syncword = avio_rb16(pb);
96 128 streamid = avio_r8(pb);
97 128 avio_r8(pb); /* counter not used */
98 128 reserved = avio_r8(pb);
99 128 flags = avio_r8(pb);
100 128 length = avio_rb16(pb);
101
102 128 pts_flag = flags & 0x10;
103
104
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 128 if (syncword != PVA_MAGIC) {
105 ✗ pva_log(s, AV_LOG_ERROR, "invalid syncword\n");
106 ✗ return AVERROR(EIO);
107 }
108
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 128 if (streamid != PVA_VIDEO_PAYLOAD && streamid != PVA_AUDIO_PAYLOAD) {
109 ✗ pva_log(s, AV_LOG_ERROR, "invalid streamid\n");
110 ✗ return AVERROR(EIO);
111 }
112
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 128 if (reserved != 0x55) {
113 ✗ pva_log(s, AV_LOG_WARNING, "expected reserved byte to be 0x55\n");
114 }
115
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 128 if (length > PVA_MAX_PAYLOAD_LENGTH) {
116 ✗ pva_log(s, AV_LOG_ERROR, "invalid payload length %u\n", length);
117 ✗ return AVERROR(EIO);
118 }
119
120
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 128 if (streamid == PVA_VIDEO_PAYLOAD && pts_flag) {
121 31 pva_pts = avio_rb32(pb);
122 31 length -= 4;
123
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 97 } else if (streamid == PVA_AUDIO_PAYLOAD) {
124 /* PVA Audio Packets either start with a signaled PES packet or
125 * are a continuation of the previous PES packet. New PES packets
126 * always start at the beginning of a PVA Packet, never somewhere in
127 * the middle. */
128
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 13 if (!pvactx->continue_pes) {
129 int pes_signal, pes_header_data_length, pes_packet_length,
130 pes_flags;
131 unsigned char pes_header_data[256];
132
133 13 pes_signal = avio_rb24(pb);
134 13 avio_r8(pb);
135 13 pes_packet_length = avio_rb16(pb);
136 13 pes_flags = avio_rb16(pb);
137 13 pes_header_data_length = avio_r8(pb);
138
139
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 13 if (avio_feof(pb)) {
140 ✗ return AVERROR_EOF;
141 }
142
143
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 13 if (pes_signal != 1 || pes_header_data_length == 0) {
144 ✗ pva_log(s, AV_LOG_WARNING, "expected non empty signaled PES packet, "
145 "trying to recover\n");
146 ✗ avio_skip(pb, length - 9);
147 ✗ if (!read_packet)
148 ✗ return AVERROR(EIO);
149 ✗ goto recover;
150 }
151
152 13 ret = ffio_read_size(pb, pes_header_data, pes_header_data_length);
153
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 13 if (ret < 0)
154 ✗ return ret;
155 13 length -= 9 + pes_header_data_length;
156
157 13 pes_packet_length -= 3 + pes_header_data_length;
158
159 13 pvactx->continue_pes = pes_packet_length;
160
161
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 13 if (pes_flags & 0x80 && (pes_header_data[0] & 0xf0) == 0x20) {
162
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 13 if (pes_header_data_length < 5) {
163 ✗ pva_log(s, AV_LOG_ERROR, "header too short\n");
164 ✗ avio_skip(pb, length);
165 ✗ return AVERROR_INVALIDDATA;
166 }
167 13 pva_pts = ff_parse_pes_pts(pes_header_data);
168 }
169 }
170
171 13 pvactx->continue_pes -= length;
172
173
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 13 if (pvactx->continue_pes < 0) {
174 ✗ pva_log(s, AV_LOG_WARNING, "audio data corruption\n");
175 ✗ pvactx->continue_pes = 0;
176 }
177 }
178
179
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 128 if (pva_pts != AV_NOPTS_VALUE)
180 44 av_add_index_entry(s->streams[streamid-1], startpos, pva_pts, 0, 0, AVINDEX_KEYFRAME);
181
182 128 *pts = pva_pts;
183 128 *len = length;
184 128 *strid = streamid;
185 128 return 0;
186 }
187
188 128 static int pva_read_packet(AVFormatContext *s, AVPacket *pkt) {
189 128 AVIOContext *pb = s->pb;
190 int64_t pva_pts;
191 int ret, length, streamid;
192
193
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 256 if (read_part_of_packet(s, &pva_pts, &length, &streamid, 1) < 0 ||
194 128 (ret = av_get_packet(pb, pkt, length)) <= 0)
195 ✗ return AVERROR(EIO);
196
197 128 pkt->stream_index = streamid - 1;
198 128 pkt->pts = pva_pts;
199
200 128 return ret;
201 }
202
203 ✗ static int64_t pva_read_timestamp(struct AVFormatContext *s, int stream_index,
204 int64_t *pos, int64_t pos_limit) {
205 ✗ AVIOContext *pb = s->pb;
206 ✗ PVAContext *pvactx = s->priv_data;
207 int length, streamid;
208 ✗ int64_t res = AV_NOPTS_VALUE;
209
210 ✗ pos_limit = FFMIN(*pos+PVA_MAX_PAYLOAD_LENGTH*8, (uint64_t)*pos+pos_limit);
211
212 ✗ while (*pos < pos_limit) {
213 ✗ res = AV_NOPTS_VALUE;
214 ✗ avio_seek(pb, *pos, SEEK_SET);
215
216 ✗ pvactx->continue_pes = 0;
217 ✗ if (read_part_of_packet(s, &res, &length, &streamid, 0)) {
218 ✗ (*pos)++;
219 ✗ continue;
220 }
221 ✗ if (streamid - 1 != stream_index || res == AV_NOPTS_VALUE) {
222 ✗ *pos = avio_tell(pb) + length;
223 ✗ continue;
224 }
225 ✗ break;
226 }
227
228 ✗ pvactx->continue_pes = 0;
229 ✗ return res;
230 }
231
232 const FFInputFormat ff_pva_demuxer = {
233 .p.name = "pva",
234 .p.long_name = NULL_IF_CONFIG_SMALL("TechnoTrend PVA"),
235 .priv_data_size = sizeof(PVAContext),
236 .read_probe = pva_probe,
237 .read_header = pva_read_header,
238 .read_packet = pva_read_packet,
239 .read_timestamp = pva_read_timestamp,
240 };
241