FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* RTP parser for loss tolerant payload format for MP3 audio (RFC 5219)
3			* Copyright (c) 2015 Gilles Chanteperdrix <gch@xenomai.org>
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 "libavutil/attributes.h"
23			#include "libavutil/intreadwrite.h"
24			#include "libavutil/mem.h"
25
26			#include "avio_internal.h"
27			#include "rtpdec_formats.h"
28
29			struct PayloadContext {
30			unsigned adu_size;
31			unsigned cur_size;
32			uint32_t timestamp;
33			uint8_t *split_buf;
34			int split_pos, split_buf_size, split_pkts;
35			AVIOContext *fragment;
36			};
37
38		✗	static void mpa_robust_close_context(PayloadContext *data)
39			{
40		✗	ffio_free_dyn_buf(&data->fragment);
41		✗	av_free(data->split_buf);
42		✗	}
43
44		✗	static int mpa_robust_parse_rtp_header(AVFormatContext *ctx,
45			const uint8_t *buf, int len,
46			unsigned *adu_size, unsigned *cont)
47			{
48			unsigned header_size;
49
50		✗	if (len < 2) {
51		✗	av_log(ctx, AV_LOG_ERROR, "Invalid %d bytes packet\n", len);
52		✗	return AVERROR_INVALIDDATA;
53			}
54
55		✗	*cont = !!(buf[0] & 0x80);
56		✗	if (!(buf[0] & 0x40)) {
57		✗	header_size = 1;
58		✗	*adu_size = buf[0] & ~0xc0;
59			} else {
60		✗	header_size = 2;
61		✗	*adu_size = AV_RB16(buf) & ~0xc000;
62			}
63
64		✗	return header_size;
65			}
66
67		✗	static int mpa_robust_parse_packet(AVFormatContext *ctx, PayloadContext *data,
68			AVStream *st, AVPacket *pkt,
69			uint32_t *timestamp, const uint8_t *buf,
70			int len, uint16_t seq, int flags)
71			{
72			unsigned adu_size, continuation;
73			int err, header_size;
74
75		✗	if (!buf) {
76		✗	buf = &data->split_buf[data->split_pos];
77		✗	len = data->split_buf_size - data->split_pos;
78
79		✗	header_size = mpa_robust_parse_rtp_header(ctx, buf, len, &adu_size,
80			&continuation);
81		✗	if (header_size < 0) {
82		✗	av_freep(&data->split_buf);
83		✗	return header_size;
84			}
85		✗	buf += header_size;
86		✗	len -= header_size;
87
88		✗	if (continuation || adu_size > len) {
89		✗	av_freep(&data->split_buf);
90		✗	av_log(ctx, AV_LOG_ERROR, "Invalid frame\n");
91		✗	return AVERROR_INVALIDDATA;
92			}
93
94		✗	if ((err = av_new_packet(pkt, adu_size)) < 0) {
95		✗	av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
96		✗	return err;
97			}
98
99		✗	pkt->stream_index = st->index;
100		✗	memcpy(pkt->data, buf, adu_size);
101
102		✗	data->split_pos += header_size + adu_size;
103
104		✗	if (data->split_pos == data->split_buf_size) {
105		✗	av_freep(&data->split_buf);
106		✗	return 0;
107			}
108
109		✗	return 1;
110			}
111
112
113		✗	header_size = mpa_robust_parse_rtp_header(ctx, buf, len, &adu_size,
114			&continuation);
115		✗	if (header_size < 0)
116		✗	return header_size;
117
118		✗	buf += header_size;
119		✗	len -= header_size;
120
121		✗	if (!continuation && adu_size <= len) {
122			/* One or more complete frames */
123
124		✗	if ((err = av_new_packet(pkt, adu_size)) < 0) {
125		✗	av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
126		✗	return err;
127			}
128
129		✗	pkt->stream_index = st->index;
130		✗	memcpy(pkt->data, buf, adu_size);
131
132		✗	buf += adu_size;
133		✗	len -= adu_size;
134		✗	if (len) {
135		✗	data->split_buf_size = len;
136		✗	data->split_buf = av_malloc(data->split_buf_size);
137		✗	data->split_pos = 0;
138		✗	if (!data->split_buf) {
139		✗	av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
140		✗	av_packet_unref(pkt);
141		✗	return AVERROR(ENOMEM);
142			}
143		✗	memcpy(data->split_buf, buf, data->split_buf_size);
144		✗	return 1;
145			}
146		✗	return 0;
147		✗	} else if (!continuation) { /* && adu_size > len */
148			/* First fragment */
149		✗	ffio_free_dyn_buf(&data->fragment);
150
151		✗	data->adu_size = adu_size;
152		✗	data->cur_size = len;
153		✗	data->timestamp = *timestamp;
154
155		✗	err = avio_open_dyn_buf(&data->fragment);
156		✗	if (err < 0)
157		✗	return err;
158
159		✗	avio_write(data->fragment, buf, len);
160		✗	return AVERROR(EAGAIN);
161			}
162			/* else continuation == 1 */
163
164			/* Fragment other than first */
165		✗	if (!data->fragment) {
166		✗	av_log(ctx, AV_LOG_WARNING,
167			"Received packet without a start fragment; dropping.\n");
168		✗	return AVERROR(EAGAIN);
169			}
170		✗	if (adu_size != data->adu_size ||
171		✗	data->timestamp != *timestamp) {
172		✗	ffio_free_dyn_buf(&data->fragment);
173		✗	av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n");
174		✗	return AVERROR_INVALIDDATA;
175			}
176
177		✗	avio_write(data->fragment, buf, len);
178		✗	data->cur_size += len;
179
180		✗	if (data->cur_size < data->adu_size)
181		✗	return AVERROR(EAGAIN);
182
183		✗	err = ff_rtp_finalize_packet(pkt, &data->fragment, st->index);
184		✗	if (err < 0) {
185		✗	av_log(ctx, AV_LOG_ERROR,
186			"Error occurred when getting fragment buffer.\n");
187		✗	return err;
188			}
189
190		✗	return 0;
191			}
192
193			const RTPDynamicProtocolHandler ff_mpeg_audio_robust_dynamic_handler = {
194			.enc_name = "mpa-robust",
195			.codec_type = AVMEDIA_TYPE_AUDIO,
196			.codec_id = AV_CODEC_ID_MP3ADU,
197			.need_parsing = AVSTREAM_PARSE_HEADERS,
198			.priv_data_size = sizeof(PayloadContext),
199			.close = mpa_robust_close_context,
200			.parse_packet = mpa_robust_parse_packet,
201			};
202