1/* 2 * sndio play and grab interface 3 * Copyright (c) 2010 Jacob Meuser 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 "libavformat/avformat.h" 26 27#include "sndio_common.h" 28 29static av_cold int audio_write_header(AVFormatContext *s1) 30{ 31 SndioData *s = s1->priv_data; 32 AVStream *st; 33 int ret; 34 35 st = s1->streams[0]; 36 s->sample_rate = st->codec->sample_rate; 37 s->channels = st->codec->channels; 38 39 ret = ff_sndio_open(s1, 1, s1->filename); 40 41 return ret; 42} 43 44static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt) 45{ 46 SndioData *s = s1->priv_data; 47 uint8_t *buf= pkt->data; 48 int size = pkt->size; 49 int len, ret; 50 51 while (size > 0) { 52 len = FFMIN(s->buffer_size - s->buffer_offset, size); 53 memcpy(s->buffer + s->buffer_offset, buf, len); 54 buf += len; 55 size -= len; 56 s->buffer_offset += len; 57 if (s->buffer_offset >= s->buffer_size) { 58 ret = sio_write(s->hdl, s->buffer, s->buffer_size); 59 if (ret == 0 || sio_eof(s->hdl)) 60 return AVERROR(EIO); 61 s->softpos += ret; 62 s->buffer_offset = 0; 63 } 64 } 65 66 return 0; 67} 68 69static int audio_write_trailer(AVFormatContext *s1) 70{ 71 SndioData *s = s1->priv_data; 72 73 sio_write(s->hdl, s->buffer, s->buffer_offset); 74 75 ff_sndio_close(s); 76 77 return 0; 78} 79 80AVOutputFormat ff_sndio_muxer = { 81 .name = "sndio", 82 .long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"), 83 .priv_data_size = sizeof(SndioData), 84 /* XXX: we make the assumption that the soundcard accepts this format */ 85 /* XXX: find better solution with "preinit" method, needed also in 86 other formats */ 87 .audio_codec = AV_NE(CODEC_ID_PCM_S16BE, CODEC_ID_PCM_S16LE), 88 .video_codec = CODEC_ID_NONE, 89 .write_header = audio_write_header, 90 .write_packet = audio_write_packet, 91 .write_trailer = audio_write_trailer, 92 .flags = AVFMT_NOFILE, 93}; 94