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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 <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 | ||
35 | struct speex_params { | |
36 | int packet_size; | |
37 | int final_packet_duration; | |
38 | int seq; | |
39 | }; | |
40 | ||
41 | static 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_stream_comment(s, st, p, os->psize); | |
87 | ||
88 | spxp->seq++; | |
89 | return 1; | |
90 | } | |
91 | ||
92 | static 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 | ||
102 | static 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 | ||
132 | const 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 | }; |