1/*
2      Copyright (C) 2008  Reimar D��ffinger
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 <stdlib.h>
26#include "libavutil/bswap.h"
27#include "libavutil/avstring.h"
28#include "libavutil/channel_layout.h"
29#include "libavcodec/get_bits.h"
30#include "libavcodec/bytestream.h"
31#include "avformat.h"
32#include "internal.h"
33#include "oggdec.h"
34
35struct speex_params {
36    int packet_size;
37    int final_packet_duration;
38    int seq;
39};
40
41static int speex_header(AVFormatContext *s, int idx) {
42    struct ogg *ogg = s->priv_data;
43    struct ogg_stream *os = ogg->streams + idx;
44    struct speex_params *spxp = os->private;
45    AVStream *st = s->streams[idx];
46    uint8_t *p = os->buf + os->pstart;
47
48    if (!spxp) {
49        spxp = av_mallocz(sizeof(*spxp));
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        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
59        st->codec->codec_id = AV_CODEC_ID_SPEEX;
60
61        if (os->psize < 68) {
62            av_log(s, AV_LOG_ERROR, "speex packet too small\n");
63            return AVERROR_INVALIDDATA;
64        }
65
66        st->codec->sample_rate = AV_RL32(p + 36);
67        st->codec->channels = AV_RL32(p + 48);
68        if (st->codec->channels < 1 || st->codec->channels > 2) {
69            av_log(s, AV_LOG_ERROR, "invalid channel count. Speex must be mono or stereo.\n");
70            return AVERROR_INVALIDDATA;
71        }
72        st->codec->channel_layout = st->codec->channels == 1 ? AV_CH_LAYOUT_MONO :
73                                                               AV_CH_LAYOUT_STEREO;
74
75        spxp->packet_size  = AV_RL32(p + 56);
76        frames_per_packet  = AV_RL32(p + 64);
77        if (frames_per_packet)
78            spxp->packet_size *= frames_per_packet;
79
80        if (ff_alloc_extradata(st->codec, os->psize) < 0)
81            return AVERROR(ENOMEM);
82        memcpy(st->codec->extradata, p, st->codec->extradata_size);
83
84        avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
85    } else
86        ff_vorbis_comment(s, &st->metadata, p, os->psize, 1);
87
88    spxp->seq++;
89    return 1;
90}
91
92static int ogg_page_packets(struct ogg_stream *os)
93{
94    int i;
95    int packets = 0;
96    for (i = 0; i < os->nsegs; i++)
97        if (os->segments[i] < 255)
98            packets++;
99    return packets;
100}
101
102static int speex_packet(AVFormatContext *s, int idx)
103{
104    struct ogg *ogg = s->priv_data;
105    struct ogg_stream *os = ogg->streams + idx;
106    struct speex_params *spxp = os->private;
107    int packet_size = spxp->packet_size;
108
109    if (os->flags & OGG_FLAG_EOS && os->lastpts != AV_NOPTS_VALUE &&
110        os->granule > 0) {
111        /* first packet of final page. we have to calculate the final packet
112           duration here because it is the only place we know the next-to-last
113           granule position. */
114        spxp->final_packet_duration = os->granule - os->lastpts -
115                                      packet_size * (ogg_page_packets(os) - 1);
116    }
117
118    if (!os->lastpts && os->granule > 0)
119        /* first packet */
120        os->lastpts = os->lastdts = os->granule - packet_size *
121                                    ogg_page_packets(os);
122    if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
123        spxp->final_packet_duration)
124        /* final packet */
125        os->pduration = spxp->final_packet_duration;
126    else
127        os->pduration = packet_size;
128
129    return 0;
130}
131
132const struct ogg_codec ff_speex_codec = {
133    .magic = "Speex   ",
134    .magicsize = 8,
135    .header = speex_header,
136    .packet = speex_packet,
137    .nb_header = 2,
138};
139