1 /*
2       Copyright (C) 2008  Reimar Döffinger
3 
4       Permission is hereby granted, free of charge, to any person
5       obtaining a copy of this software and associated documentation
6       files (the "Software"), to deal in the Software without
7       restriction, including without limitation the rights to use, copy,
8       modify, merge, publish, distribute, sublicense, and/or sell copies
9       of the Software, and to permit persons to whom the Software is
10       furnished to do so, subject to the following conditions:
11 
12       The above copyright notice and this permission notice shall be
13       included in all copies or substantial portions of the Software.
14 
15       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16       EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17       MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18       NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19       HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20       WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21       OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22       DEALINGS IN THE SOFTWARE.
23 **/
24 
25 #include "libavutil/channel_layout.h"
26 #include "libavutil/intreadwrite.h"
27 
28 #include "avformat.h"
29 #include "internal.h"
30 #include "oggdec.h"
31 
32 struct speex_params {
33     int packet_size;
34     int final_packet_duration;
35     int seq;
36 };
37 
speex_header(AVFormatContext *s, int idx)38 static int speex_header(AVFormatContext *s, int idx) {
39     struct ogg *ogg = s->priv_data;
40     struct ogg_stream *os = ogg->streams + idx;
41     struct speex_params *spxp = os->private;
42     AVStream *st = s->streams[idx];
43     uint8_t *p = os->buf + os->pstart;
44     int ret;
45 
46     if (!spxp) {
47         spxp = av_mallocz(sizeof(*spxp));
48         if (!spxp)
49             return AVERROR(ENOMEM);
50         os->private = spxp;
51     }
52 
53     if (spxp->seq > 1)
54         return 0;
55 
56     if (spxp->seq == 0) {
57         int frames_per_packet;
58         int channels;
59         st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
60         st->codecpar->codec_id = AV_CODEC_ID_SPEEX;
61 
62         if (os->psize < 68) {
63             av_log(s, AV_LOG_ERROR, "speex packet too small\n");
64             return AVERROR_INVALIDDATA;
65         }
66 
67         st->codecpar->sample_rate = AV_RL32(p + 36);
68         if (st->codecpar->sample_rate <= 0) {
69             av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", st->codecpar->sample_rate);
70             return AVERROR_INVALIDDATA;
71         }
72         channels = AV_RL32(p + 48);
73         if (channels < 1 || channels > 2) {
74             av_log(s, AV_LOG_ERROR, "invalid channel count. Speex must be mono or stereo.\n");
75             return AVERROR_INVALIDDATA;
76         }
77         av_channel_layout_default(&st->codecpar->ch_layout, channels);
78 
79         spxp->packet_size  = AV_RL32(p + 56);
80         frames_per_packet  = AV_RL32(p + 64);
81         if (spxp->packet_size < 0 ||
82             frames_per_packet < 0 ||
83             spxp->packet_size * (int64_t)frames_per_packet > INT32_MAX / 256) {
84             av_log(s, AV_LOG_ERROR, "invalid packet_size, frames_per_packet %d %d\n", spxp->packet_size, frames_per_packet);
85             spxp->packet_size = 0;
86             return AVERROR_INVALIDDATA;
87         }
88         if (frames_per_packet)
89             spxp->packet_size *= frames_per_packet;
90 
91         if ((ret = ff_alloc_extradata(st->codecpar, os->psize)) < 0)
92             return ret;
93         memcpy(st->codecpar->extradata, p, st->codecpar->extradata_size);
94 
95         avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
96     } else
97         ff_vorbis_stream_comment(s, st, p, os->psize);
98 
99     spxp->seq++;
100     return 1;
101 }
102 
ogg_page_packets(struct ogg_stream *os)103 static int ogg_page_packets(struct ogg_stream *os)
104 {
105     int i;
106     int packets = 0;
107     for (i = 0; i < os->nsegs; i++)
108         if (os->segments[i] < 255)
109             packets++;
110     return packets;
111 }
112 
speex_packet(AVFormatContext *s, int idx)113 static int speex_packet(AVFormatContext *s, int idx)
114 {
115     struct ogg *ogg = s->priv_data;
116     struct ogg_stream *os = ogg->streams + idx;
117     struct speex_params *spxp = os->private;
118     int packet_size = spxp->packet_size;
119 
120     if (os->flags & OGG_FLAG_EOS && os->lastpts != AV_NOPTS_VALUE &&
121         os->granule > 0) {
122         /* first packet of final page. we have to calculate the final packet
123            duration here because it is the only place we know the next-to-last
124            granule position. */
125         spxp->final_packet_duration = os->granule - os->lastpts -
126                                       packet_size * (ogg_page_packets(os) - 1);
127     }
128 
129     if (!os->lastpts && os->granule > 0)
130         /* first packet */
131         os->lastpts = os->lastdts = os->granule - packet_size *
132                                     ogg_page_packets(os);
133     if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
134         spxp->final_packet_duration)
135         /* final packet */
136         os->pduration = spxp->final_packet_duration;
137     else
138         os->pduration = packet_size;
139 
140     return 0;
141 }
142 
143 const struct ogg_codec ff_speex_codec = {
144     .magic = "Speex   ",
145     .magicsize = 8,
146     .header = speex_header,
147     .packet = speex_packet,
148     .nb_header = 2,
149 };
150