| /* |
| * sndio play and grab interface |
| * Copyright (c) 2010 Jacob Meuser |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdint.h> |
| #include <sndio.h> |
| |
| #include "libavformat/avformat.h" |
| #include "libavformat/internal.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/time.h" |
| |
| #include "sndio_common.h" |
| |
| static av_cold int audio_read_header(AVFormatContext *s1) |
| { |
| SndioData *s = s1->priv_data; |
| AVStream *st; |
| int ret; |
| |
| st = avformat_new_stream(s1, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| ret = ff_sndio_open(s1, 0, s1->filename); |
| if (ret < 0) |
| return ret; |
| |
| /* take real parameters */ |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = s->codec_id; |
| st->codec->sample_rate = s->sample_rate; |
| st->codec->channels = s->channels; |
| |
| avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
| |
| return 0; |
| } |
| |
| static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt) |
| { |
| SndioData *s = s1->priv_data; |
| int64_t bdelay, cur_time; |
| int ret; |
| |
| if ((ret = av_new_packet(pkt, s->buffer_size)) < 0) |
| return ret; |
| |
| ret = sio_read(s->hdl, pkt->data, pkt->size); |
| if (ret == 0 || sio_eof(s->hdl)) { |
| av_free_packet(pkt); |
| return AVERROR_EOF; |
| } |
| |
| pkt->size = ret; |
| s->softpos += ret; |
| |
| /* compute pts of the start of the packet */ |
| cur_time = av_gettime(); |
| |
| bdelay = ret + s->hwpos - s->softpos; |
| |
| /* convert to pts */ |
| pkt->pts = cur_time - ((bdelay * 1000000) / |
| (s->bps * s->channels * s->sample_rate)); |
| |
| return 0; |
| } |
| |
| static av_cold int audio_read_close(AVFormatContext *s1) |
| { |
| SndioData *s = s1->priv_data; |
| |
| ff_sndio_close(s); |
| |
| return 0; |
| } |
| |
| static const AVOption options[] = { |
| { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
| { "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
| { NULL }, |
| }; |
| |
| static const AVClass sndio_demuxer_class = { |
| .class_name = "sndio indev", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVInputFormat ff_sndio_demuxer = { |
| .name = "sndio", |
| .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"), |
| .priv_data_size = sizeof(SndioData), |
| .read_header = audio_read_header, |
| .read_packet = audio_read_packet, |
| .read_close = audio_read_close, |
| .flags = AVFMT_NOFILE, |
| .priv_class = &sndio_demuxer_class, |
| }; |