Statistics
| Branch: | Revision:

ffmpeg / libavformat / rtpdec_svq3.c @ 9261e6cf

History | View | Annotate | Download (3.96 KB)

1
/*
2
 * Sorenson-3 (SVQ3/SV3V) payload for RTP
3
 * Copyright (c) 2010 Ronald S. Bultje
4
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav 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
 * Libav 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 Libav; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file
24
 * @brief RTP support for the SV3V (SVQ3) payload
25
 * (http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization)
26
 * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
27
 */
28

    
29
#include <string.h>
30
#include "libavutil/intreadwrite.h"
31
#include "rtp.h"
32
#include "rtpdec.h"
33
#include "rtpdec_formats.h"
34

    
35
struct PayloadContext {
36
    AVIOContext *pktbuf;
37
    int64_t        timestamp;
38
};
39

    
40
/** return 0 on packet, <0 on partial packet or error... */
41
static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
42
                              AVStream *st, AVPacket *pkt,
43
                              uint32_t *timestamp,
44
                              const uint8_t *buf, int len, int flags)
45
{
46
    int config_packet, start_packet, end_packet;
47

    
48
    if (len < 2)
49
        return AVERROR_INVALIDDATA;
50

    
51
    config_packet = buf[0] & 0x40;
52
    start_packet  = buf[0] & 0x20;
53
    end_packet    = buf[0] & 0x10;
54
    buf += 2;     // ignore buf[1]
55
    len -= 2;
56

    
57
    if (config_packet) {
58

    
59
        av_freep(&st->codec->extradata);
60
        st->codec->extradata_size = 0;
61

    
62
        if (len < 2 || !(st->codec->extradata =
63
                         av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
64
            return AVERROR_INVALIDDATA;
65

    
66
        st->codec->extradata_size = len + 8;
67
        memcpy(st->codec->extradata, "SEQH", 4);
68
        AV_WB32(st->codec->extradata + 4, len);
69
        memcpy(st->codec->extradata + 8, buf, len);
70

    
71
        /* We set codec_id to CODEC_ID_NONE initially to
72
         * delay decoder initialization since extradata is
73
         * carried within the RTP stream, not SDP. Here,
74
         * by setting codec_id to CODEC_ID_SVQ3, we are signalling
75
         * to the decoder that it is OK to initialize. */
76
        st->codec->codec_id = CODEC_ID_SVQ3;
77

    
78
        return AVERROR(EAGAIN);
79
    }
80

    
81
    if (start_packet) {
82
        int res;
83

    
84
        if (sv->pktbuf) {
85
            uint8_t *tmp;
86
            avio_close_dyn_buf(sv->pktbuf, &tmp);
87
            av_free(tmp);
88
        }
89
        if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
90
            return res;
91
        sv->timestamp   = *timestamp;
92
    }
93

    
94
    if (!sv->pktbuf)
95
        return AVERROR_INVALIDDATA;
96

    
97
    avio_write(sv->pktbuf, buf, len);
98

    
99
    if (end_packet) {
100
        av_init_packet(pkt);
101
        pkt->stream_index = st->index;
102
        *timestamp        = sv->timestamp;
103
        pkt->size         = avio_close_dyn_buf(sv->pktbuf, &pkt->data);
104
        pkt->destruct     = av_destruct_packet;
105
        sv->pktbuf        = NULL;
106
        return 0;
107
    }
108

    
109
    return AVERROR(EAGAIN);
110
}
111

    
112
static PayloadContext *svq3_extradata_new(void)
113
{
114
    return av_mallocz(sizeof(PayloadContext));
115
}
116

    
117
static void svq3_extradata_free(PayloadContext *sv)
118
{
119
    if (sv->pktbuf) {
120
        uint8_t *buf;
121
        avio_close_dyn_buf(sv->pktbuf, &buf);
122
        av_free(buf);
123
    }
124
    av_free(sv);
125
}
126

    
127
RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
128
    .enc_name         = "X-SV3V-ES",
129
    .codec_type       = AVMEDIA_TYPE_VIDEO,
130
    .codec_id         = CODEC_ID_NONE,      // see if (config_packet) above
131
    .alloc            = svq3_extradata_new,
132
    .free             = svq3_extradata_free,
133
    .parse_packet     = svq3_parse_packet,
134
};