2 * This file is part of Libav.
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
26 VocDecContext *voc = s->priv_data;
27 AVCodecParameters *par = st->codecpar;
28 AVIOContext *pb = s->pb;
30 int size, tmp_codec=-1;
34 while (!voc->remaining_size) {
36 if (type == VOC_TYPE_EOF)
38 voc->remaining_size = avio_rl24(pb);
39 if (!voc->remaining_size) {
40 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
42 voc->remaining_size = avio_size(pb) - avio_tell(pb);
47 case VOC_TYPE_VOICE_DATA:
48 if (!par->sample_rate) {
49 par->sample_rate = 1000000 / (256 - avio_r8(pb));
51 par->sample_rate = sample_rate;
52 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
53 par->channels = channels;
54 par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
57 tmp_codec = avio_r8(pb);
58 voc->remaining_size -= 2;
63 case VOC_TYPE_VOICE_DATA_CONT:
66 case VOC_TYPE_EXTENDED:
67 sample_rate = avio_rl16(pb);
69 channels = avio_r8(pb) + 1;
70 sample_rate = 256000000 / (channels * (65536 - sample_rate));
71 voc->remaining_size = 0;
75 case VOC_TYPE_NEW_VOICE_DATA:
76 if (!par->sample_rate) {
77 par->sample_rate = avio_rl32(pb);
78 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
79 par->bits_per_coded_sample = avio_r8(pb);
80 par->channels = avio_r8(pb);
83 tmp_codec = avio_rl16(pb);
85 voc->remaining_size -= 12;
90 avio_skip(pb, voc->remaining_size);
91 max_size -= voc->remaining_size;
92 voc->remaining_size = 0;
98 tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
99 if (par->codec_id == AV_CODEC_ID_NONE)
100 par->codec_id = tmp_codec;
101 else if (par->codec_id != tmp_codec)
102 av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
103 if (par->codec_id == AV_CODEC_ID_NONE) {
104 if (s->audio_codec_id == AV_CODEC_ID_NONE) {
105 av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
106 return AVERROR(EINVAL);
108 av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
112 par->bit_rate = par->sample_rate * par->bits_per_coded_sample;
116 size = FFMIN(voc->remaining_size, max_size);
117 voc->remaining_size -= size;
118 return av_get_packet(pb, pkt, size);