oss_audio: Split muxer and demuxer

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 146 insertions, 0 deletions

diff --git a/libavdevice/oss_audio_dec.c b/libavdevice/oss_audio_dec.c
new file mode 100644
index 0000000000..601d91c31f
--- /dev/null
+++ b/libavdevice/oss_audio_dec.c
@@ -0,0 +1,146 @@
+/*
+ * Linux audio play interface
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ *
+ * 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 "config.h"
+
+#include <stdint.h>
+
+#if HAVE_SOUNDCARD_H
+#include <soundcard.h>
+#else
+#include <sys/soundcard.h>
+#endif
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/time.h"
+
+#include "libavcodec/avcodec.h"
+
+#include "libavformat/avformat.h"
+#include "libavformat/internal.h"
+
+#include "oss_audio.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,
+};
+
+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,
+};