diff options
Diffstat (limited to 'libavdevice/sndio_dec.c')
-rw-r--r-- | libavdevice/sndio_dec.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/libavdevice/sndio_dec.c b/libavdevice/sndio_dec.c new file mode 100644 index 0000000000..ff2adeb0af --- /dev/null +++ b/libavdevice/sndio_dec.c @@ -0,0 +1,108 @@ +/* + * sndio play and grab interface + * Copyright (c) 2010 Jacob Meuser + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 "sndio_common.h" + +static av_cold int audio_read_header(AVFormatContext *s1, + AVFormatParameters *ap) +{ + SndioData *s = s1->priv_data; + AVStream *st; + int ret; + + if (ap->sample_rate <= 0 || ap->channels <= 0) + return AVERROR(EINVAL); + + st = av_new_stream(s1, 0); + if (!st) + return AVERROR(ENOMEM); + + s->sample_rate = ap->sample_rate; + s->channels = ap->channels; + + 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; + + av_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; +} + +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, +}; |