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https://github.com/FFmpeg/FFmpeg.git
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94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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* sndio play and grab interface
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* Copyright (c) 2010 Jacob Meuser
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include <stdint.h>
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#include <sndio.h>
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#include "libavformat/avformat.h"
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#include "sndio_common.h"
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static av_cold int audio_write_header(AVFormatContext *s1)
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{
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SndioData *s = s1->priv_data;
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AVStream *st;
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int ret;
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st = s1->streams[0];
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s->sample_rate = st->codec->sample_rate;
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s->channels = st->codec->channels;
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ret = ff_sndio_open(s1, 1, s1->filename);
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return ret;
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}
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static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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SndioData *s = s1->priv_data;
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uint8_t *buf= pkt->data;
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int size = pkt->size;
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int len, ret;
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while (size > 0) {
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len = FFMIN(s->buffer_size - s->buffer_offset, size);
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memcpy(s->buffer + s->buffer_offset, buf, len);
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buf += len;
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size -= len;
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s->buffer_offset += len;
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if (s->buffer_offset >= s->buffer_size) {
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ret = sio_write(s->hdl, s->buffer, s->buffer_size);
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if (ret == 0 || sio_eof(s->hdl))
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return AVERROR(EIO);
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s->softpos += ret;
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s->buffer_offset = 0;
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}
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}
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return 0;
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}
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static int audio_write_trailer(AVFormatContext *s1)
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{
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SndioData *s = s1->priv_data;
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sio_write(s->hdl, s->buffer, s->buffer_offset);
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ff_sndio_close(s);
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return 0;
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}
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AVOutputFormat ff_sndio_muxer = {
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.name = "sndio",
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.long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"),
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.priv_data_size = sizeof(SndioData),
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/* XXX: we make the assumption that the soundcard accepts this format */
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/* XXX: find better solution with "preinit" method, needed also in
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other formats */
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.audio_codec = AV_NE(CODEC_ID_PCM_S16BE, CODEC_ID_PCM_S16LE),
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.video_codec = CODEC_ID_NONE,
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.write_header = audio_write_header,
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.write_packet = audio_write_packet,
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.write_trailer = audio_write_trailer,
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.flags = AVFMT_NOFILE,
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};
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