avformat/concatdec: set safe mode to enabled instead of auto
[ffmpeg.git] / libavformat / voc_packet.c
1 /*
2  * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 #include "libavutil/intreadwrite.h"
22 #include "avformat.h"
23 #include "internal.h"
24 #include "voc.h"
25
26 int
27 ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
28 {
29     VocDecContext *voc = s->priv_data;
30     AVCodecContext *dec = st->codec;
31     AVIOContext *pb = s->pb;
32     VocType type;
33     int size, tmp_codec=-1;
34     int sample_rate = 0;
35     int channels = 1;
36     int64_t duration;
37     int ret;
38
39     av_add_index_entry(st,
40                        avio_tell(pb),
41                        voc->pts,
42                        voc->remaining_size,
43                        0,
44                        AVINDEX_KEYFRAME);
45
46     while (!voc->remaining_size) {
47         type = avio_r8(pb);
48         if (type == VOC_TYPE_EOF)
49             return AVERROR_EOF;
50         voc->remaining_size = avio_rl24(pb);
51         if (!voc->remaining_size) {
52             if (!s->pb->seekable)
53                 return AVERROR(EIO);
54             voc->remaining_size = avio_size(pb) - avio_tell(pb);
55         }
56         max_size -= 4;
57
58         switch (type) {
59         case VOC_TYPE_VOICE_DATA:
60             if (!dec->sample_rate) {
61                 dec->sample_rate = 1000000 / (256 - avio_r8(pb));
62                 if (sample_rate)
63                     dec->sample_rate = sample_rate;
64                 avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
65                 dec->channels = channels;
66                 dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id);
67             } else
68                 avio_skip(pb, 1);
69             tmp_codec = avio_r8(pb);
70             voc->remaining_size -= 2;
71             max_size -= 2;
72             channels = 1;
73             break;
74
75         case VOC_TYPE_VOICE_DATA_CONT:
76             break;
77
78         case VOC_TYPE_EXTENDED:
79             sample_rate = avio_rl16(pb);
80             avio_r8(pb);
81             channels = avio_r8(pb) + 1;
82             sample_rate = 256000000 / (channels * (65536 - sample_rate));
83             voc->remaining_size = 0;
84             max_size -= 4;
85             break;
86
87         case VOC_TYPE_NEW_VOICE_DATA:
88             if (!dec->sample_rate) {
89                 dec->sample_rate = avio_rl32(pb);
90                 avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
91                 dec->bits_per_coded_sample = avio_r8(pb);
92                 dec->channels = avio_r8(pb);
93             } else
94                 avio_skip(pb, 6);
95             tmp_codec = avio_rl16(pb);
96             avio_skip(pb, 4);
97             voc->remaining_size -= 12;
98             max_size -= 12;
99             break;
100
101         default:
102             avio_skip(pb, voc->remaining_size);
103             max_size -= voc->remaining_size;
104             voc->remaining_size = 0;
105             break;
106         }
107     }
108
109     if (tmp_codec >= 0) {
110         tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
111         if (dec->codec_id == AV_CODEC_ID_NONE)
112             dec->codec_id = tmp_codec;
113         else if (dec->codec_id != tmp_codec)
114             av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
115         if (dec->codec_id == AV_CODEC_ID_NONE) {
116             if (s->audio_codec_id == AV_CODEC_ID_NONE) {
117                 av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
118                 return AVERROR(EINVAL);
119             }
120             av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
121         }
122     }
123
124     dec->bit_rate = dec->sample_rate * dec->channels * dec->bits_per_coded_sample;
125
126     if (max_size <= 0)
127         max_size = 2048;
128     size = FFMIN(voc->remaining_size, max_size);
129     voc->remaining_size -= size;
130
131     ret = av_get_packet(pb, pkt, size);
132     pkt->dts = pkt->pts = voc->pts;
133
134     duration = av_get_audio_frame_duration(st->codec, size);
135     if (duration > 0 && voc->pts != AV_NOPTS_VALUE)
136         voc->pts += duration;
137     else
138         voc->pts = AV_NOPTS_VALUE;
139
140     return ret;
141 }