236dd4e806
Work by Yorick Hardy and myself. Also submitted to ffmpeg-devel, but they didn't take much notice. To record audio: $ ffmpeg4 -f sunau -i /dev/audio0 recording.wav To play audio: $ ffmpeg4 -i recording.wav -f sunau /dev/audio0 Bump PKGREVISION
145 lines
4.3 KiB
C
145 lines
4.3 KiB
C
$NetBSD: patch-libavdevice_sunau__dec.c,v 1.1 2020/03/20 21:19:54 nia Exp $
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Sun audio support.
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--- libavdevice/sunau_dec.c.orig 2020-03-20 20:53:01.607986932 +0000
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+++ libavdevice/sunau_dec.c
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@@ -0,0 +1,138 @@
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+/*
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+ * Solaris/NetBSD play and grab interface
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+ * Copyright (c) 2020 Yorick Hardy
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+ * Copyright (c) 2020 Nia Alarie <nia@NetBSD.org>
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+ *
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+ * This file is part of FFmpeg.
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+ *
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+ * FFmpeg is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU Lesser General Public
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+ * License as published by the Free Software Foundation; either
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+ * version 2.1 of the License, or (at your option) any later version.
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+ *
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+ * FFmpeg is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * Lesser General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Lesser General Public
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+ * License along with FFmpeg; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+ */
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+
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+#include "config.h"
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+
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+#include <stdint.h>
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+
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+#include <unistd.h>
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+#include <fcntl.h>
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+#include <poll.h>
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+#include <sys/audioio.h>
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+#include <sys/ioctl.h>
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+
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+#include "libavutil/internal.h"
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+#include "libavutil/opt.h"
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+#include "libavutil/time.h"
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+
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+#include "libavcodec/avcodec.h"
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+
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+#include "avdevice.h"
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+#include "libavformat/internal.h"
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+
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+#include "sunau.h"
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+
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+static int audio_read_header(AVFormatContext *s1)
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+{
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+ SunAudioData *s = s1->priv_data;
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+ AVStream *st;
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+
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+ st = avformat_new_stream(s1, NULL);
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+ if (!st) {
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+ return AVERROR(ENOMEM);
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+ }
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+
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+ if (ff_sunau_audio_open(s1, 0, s1->url) < 0) {
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+ return AVERROR(EIO);
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+ }
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+
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+ /* take real parameters */
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+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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+ st->codecpar->codec_id = s->codec_id;
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+ st->codecpar->sample_rate = s->sample_rate;
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+ st->codecpar->channels = s->channels;
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+
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+ avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
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+
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+ return 0;
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+}
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+
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+static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
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+{
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+ SunAudioData *s = s1->priv_data;
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+ struct audio_info info;
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+ int ret;
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+ long bdelay;
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+ int64_t cur_time;
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+
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+ if ((ret = av_new_packet(pkt, s->blocksize)) < 0)
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+ return ret;
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+
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+ ret = read(s->fd, pkt->data, pkt->size);
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+ if (ret <= 0) {
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+ av_packet_unref(pkt);
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+ pkt->size = 0;
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+ return ret < 0 ? AVERROR(errno) : AVERROR_EOF;
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+ }
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+
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+ /* compute pts of the start of the packet */
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+ cur_time = av_gettime();
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+ bdelay = ret;
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+
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+#ifdef AUDIO_GETBUFINFO /* BSD extension */
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+ if (ioctl(s->fd, AUDIO_GETBUFINFO, &info) == 0) {
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+ bdelay += info.record.seek;
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+ }
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+#endif
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+
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+ /* subtract time represented by the number of bytes in the audio fifo */
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+ cur_time -= (bdelay * 1000000LL) / (s->sample_rate * s->channels * s->precision);
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+
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+ /* convert to wanted units */
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+ pkt->pts = cur_time;
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+
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+ return 0;
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+}
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+
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+static int audio_read_close(AVFormatContext *s1)
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+{
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+ SunAudioData *s = s1->priv_data;
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+
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+ ff_sunau_audio_close(s);
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+ return 0;
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+}
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+
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+static const AVOption options[] = {
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+ { "buffer_samples", "", offsetof(SunAudioData, buffer_samples), AV_OPT_TYPE_INT, {.i64 = 32}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
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+ { "sample_rate", "", offsetof(SunAudioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1000, 192000, AV_OPT_FLAG_DECODING_PARAM },
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+ { "channels", "", offsetof(SunAudioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, 12, AV_OPT_FLAG_DECODING_PARAM },
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+ { NULL },
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+};
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+
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+static const AVClass sunau_demuxer_class = {
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+ .class_name = "Sun/NetBSD audio demuxer",
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+ .item_name = av_default_item_name,
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+ .option = options,
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+ .version = LIBAVUTIL_VERSION_INT,
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+ .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
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+};
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+
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+AVInputFormat ff_sunau_demuxer = {
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+ .name = "sunau",
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+ .long_name = NULL_IF_CONFIG_SMALL("Sun/NetBSD audio capture"),
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+ .priv_data_size = sizeof(SunAudioData),
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+ .read_header = audio_read_header,
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+ .read_packet = audio_read_packet,
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+ .read_close = audio_read_close,
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+ .flags = AVFMT_NOFILE,
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+ .priv_class = &sunau_demuxer_class,
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+};
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