1/* 2 * sndio play and grab interface 3 * Copyright (c) 2010 Jacob Meuser 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <stdint.h> 23#include <sndio.h> 24 25#include "avdevice.h" 26#include "sndio_common.h" 27 28static av_cold int audio_write_header(AVFormatContext *s1) 29{ 30 SndioData *s = s1->priv_data; 31 AVStream *st; 32 int ret; 33 34 st = s1->streams[0]; 35 s->sample_rate = st->codec->sample_rate; 36 s->channels = st->codec->channels; 37 38 ret = ff_sndio_open(s1, 1, s1->filename); 39 40 return ret; 41} 42 43static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt) 44{ 45 SndioData *s = s1->priv_data; 46 uint8_t *buf= pkt->data; 47 int size = pkt->size; 48 int len, ret; 49 50 while (size > 0) { 51 len = FFMIN(s->buffer_size - s->buffer_offset, size); 52 memcpy(s->buffer + s->buffer_offset, buf, len); 53 buf += len; 54 size -= len; 55 s->buffer_offset += len; 56 if (s->buffer_offset >= s->buffer_size) { 57 ret = sio_write(s->hdl, s->buffer, s->buffer_size); 58 if (ret == 0 || sio_eof(s->hdl)) 59 return AVERROR(EIO); 60 s->softpos += ret; 61 s->buffer_offset = 0; 62 } 63 } 64 65 return 0; 66} 67 68static int audio_write_trailer(AVFormatContext *s1) 69{ 70 SndioData *s = s1->priv_data; 71 72 sio_write(s->hdl, s->buffer, s->buffer_offset); 73 74 ff_sndio_close(s); 75 76 return 0; 77} 78 79static const AVClass sndio_muxer_class = { 80 .class_name = "sndio outdev", 81 .item_name = av_default_item_name, 82 .version = LIBAVUTIL_VERSION_INT, 83 .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT, 84}; 85 86AVOutputFormat ff_sndio_muxer = { 87 .name = "sndio", 88 .long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"), 89 .priv_data_size = sizeof(SndioData), 90 /* XXX: we make the assumption that the soundcard accepts this format */ 91 /* XXX: find better solution with "preinit" method, needed also in 92 other formats */ 93 .audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE), 94 .video_codec = AV_CODEC_ID_NONE, 95 .write_header = audio_write_header, 96 .write_packet = audio_write_packet, 97 .write_trailer = audio_write_trailer, 98 .flags = AVFMT_NOFILE, 99 .priv_class = &sndio_muxer_class, 100}; 101