diff options
author | Michael Niedermayer <michaelni@gmx.at> | 2015-04-09 22:36:42 +0300 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2015-04-09 22:36:42 +0300 |
commit | b1b58310d09297eb8e64b156e6da3406bc866cce (patch) | |
tree | 9314f08b45e3e58b6afb667d4f30a05dabe497e0 /libavdevice/oss_dec.c | |
parent | 259fd4c7cfb8afbb022921b44fe6611fcefff3b1 (diff) | |
parent | 8d26c193fb42d08602ac93ece039d4718d029adc (diff) |
Merge commit '8d26c193fb42d08602ac93ece039d4718d029adc'
* commit '8d26c193fb42d08602ac93ece039d4718d029adc':
avdevice: Apply a more consistent file naming scheme
Conflicts:
libavdevice/Makefile
libavdevice/alsa.h
libavdevice/alsa_dec.c
libavdevice/alsa_enc.c
libavdevice/sndio_enc.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavdevice/oss_dec.c')
-rw-r--r-- | libavdevice/oss_dec.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/libavdevice/oss_dec.c b/libavdevice/oss_dec.c new file mode 100644 index 0000000000..156d6ae9a6 --- /dev/null +++ b/libavdevice/oss_dec.c @@ -0,0 +1,149 @@ +/* + * Linux audio play interface + * Copyright (c) 2000, 2001 Fabrice Bellard + * + * 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 "config.h" + +#include <stdint.h> + +#if HAVE_SOUNDCARD_H +#include <soundcard.h> +#else +#include <sys/soundcard.h> +#endif + +#if HAVE_UNISTD_H +#include <unistd.h> +#endif +#include <fcntl.h> +#include <sys/ioctl.h> + +#include "libavutil/internal.h" +#include "libavutil/opt.h" +#include "libavutil/time.h" + +#include "libavcodec/avcodec.h" + +#include "avdevice.h" +#include "libavformat/internal.h" + +#include "oss.h" + +static int audio_read_header(AVFormatContext *s1) +{ + OSSAudioData *s = s1->priv_data; + AVStream *st; + int ret; + + st = avformat_new_stream(s1, NULL); + if (!st) { + return AVERROR(ENOMEM); + } + + ret = ff_oss_audio_open(s1, 0, s1->filename); + if (ret < 0) { + return AVERROR(EIO); + } + + /* 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) +{ + OSSAudioData *s = s1->priv_data; + int ret, bdelay; + int64_t cur_time; + struct audio_buf_info abufi; + + if ((ret=av_new_packet(pkt, s->frame_size)) < 0) + return ret; + + ret = read(s->fd, pkt->data, pkt->size); + if (ret <= 0){ + av_free_packet(pkt); + pkt->size = 0; + if (ret<0) return AVERROR(errno); + else return AVERROR_EOF; + } + pkt->size = ret; + + /* compute pts of the start of the packet */ + cur_time = av_gettime(); + bdelay = ret; + if (ioctl(s->fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) { + bdelay += abufi.bytes; + } + /* subtract time represented by the number of bytes in the audio fifo */ + cur_time -= (bdelay * 1000000LL) / (s->sample_rate * s->channels); + + /* convert to wanted units */ + pkt->pts = cur_time; + + if (s->flip_left && s->channels == 2) { + int i; + short *p = (short *) pkt->data; + + for (i = 0; i < ret; i += 4) { + *p = ~*p; + p += 2; + } + } + return 0; +} + +static int audio_read_close(AVFormatContext *s1) +{ + OSSAudioData *s = s1->priv_data; + + ff_oss_audio_close(s); + return 0; +} + +static const AVOption options[] = { + { "sample_rate", "", offsetof(OSSAudioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, + { "channels", "", offsetof(OSSAudioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, + { NULL }, +}; + +static const AVClass oss_demuxer_class = { + .class_name = "OSS demuxer", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, + .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT, +}; + +AVInputFormat ff_oss_demuxer = { + .name = "oss", + .long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) capture"), + .priv_data_size = sizeof(OSSAudioData), + .read_header = audio_read_header, + .read_packet = audio_read_packet, + .read_close = audio_read_close, + .flags = AVFMT_NOFILE, + .priv_class = &oss_demuxer_class, +}; |