mirror of https://github.com/FFmpeg/FFmpeg.git
The libavformat API is not suitable for exporting output devices as muxers. Some practical problems are e.g. lack of timing/synchronization mechanisms or interaction with output-specific features.pull/272/head
Diego Biurrun
7 years ago
parent
eb3c1a94ad
commit
8e7e042d41
12 changed files with 22 additions and 419 deletions
@ -1,33 +0,0 @@ |
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@chapter Output Devices |
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@c man begin OUTPUT DEVICES |
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Output devices are configured elements in Libav which allow to write |
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multimedia data to an output device attached to your system. |
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When you configure your Libav build, all the supported output devices |
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are enabled by default. You can list all available ones using the |
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configure option "--list-outdevs". |
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You can disable all the output devices using the configure option |
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"--disable-outdevs", and selectively enable an output device using the |
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option "--enable-outdev=@var{OUTDEV}", or you can disable a particular |
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input device using the option "--disable-outdev=@var{OUTDEV}". |
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The option "-formats" of the av* tools will display the list of |
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enabled output devices (amongst the muxers). |
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A description of the currently available output devices follows. |
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@section alsa |
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ALSA (Advanced Linux Sound Architecture) output device. |
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@section oss |
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OSS (Open Sound System) output device. |
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@section sndio |
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sndio audio output device. |
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@c man end OUTPUT DEVICES |
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@ -1,117 +0,0 @@ |
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/*
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* ALSA input and output |
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* Copyright (c) 2007 Luca Abeni ( lucabe72 email it ) |
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* Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr ) |
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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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/**
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* @file |
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* ALSA input and output: output |
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* @author Luca Abeni ( lucabe72 email it ) |
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* @author Benoit Fouet ( benoit fouet free fr ) |
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* |
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* This avdevice encoder allows to play audio to an ALSA (Advanced Linux |
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* Sound Architecture) device. |
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* |
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* The filename parameter is the name of an ALSA PCM device capable of |
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* capture, for example "default" or "plughw:1"; see the ALSA documentation |
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* for naming conventions. The empty string is equivalent to "default". |
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* |
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* The playback period is set to the lower value available for the device, |
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* which gives a low latency suitable for real-time playback. |
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*/ |
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#include <alsa/asoundlib.h> |
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#include "libavutil/internal.h" |
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#include "libavformat/avformat.h" |
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#include "alsa.h" |
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static av_cold int audio_write_header(AVFormatContext *s1) |
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{ |
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AlsaData *s = s1->priv_data; |
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AVStream *st; |
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unsigned int sample_rate; |
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enum AVCodecID codec_id; |
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int res; |
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st = s1->streams[0]; |
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sample_rate = st->codecpar->sample_rate; |
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codec_id = st->codecpar->codec_id; |
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res = ff_alsa_open(s1, SND_PCM_STREAM_PLAYBACK, &sample_rate, |
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st->codecpar->channels, &codec_id); |
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if (sample_rate != st->codecpar->sample_rate) { |
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av_log(s1, AV_LOG_ERROR, |
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"sample rate %d not available, nearest is %d\n", |
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st->codecpar->sample_rate, sample_rate); |
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goto fail; |
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} |
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return res; |
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fail: |
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snd_pcm_close(s->h); |
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return AVERROR(EIO); |
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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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AlsaData *s = s1->priv_data; |
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int res; |
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int size = pkt->size; |
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uint8_t *buf = pkt->data; |
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size /= s->frame_size; |
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if (s->reorder_func) { |
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if (size > s->reorder_buf_size) |
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if (ff_alsa_extend_reorder_buf(s, size)) |
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return AVERROR(ENOMEM); |
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s->reorder_func(buf, s->reorder_buf, size); |
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buf = s->reorder_buf; |
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} |
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while ((res = snd_pcm_writei(s->h, buf, size)) < 0) { |
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if (res == -EAGAIN) { |
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return AVERROR(EAGAIN); |
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} |
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if (ff_alsa_xrun_recover(s1, res) < 0) { |
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av_log(s1, AV_LOG_ERROR, "ALSA write error: %s\n", |
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snd_strerror(res)); |
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return AVERROR(EIO); |
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} |
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} |
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return 0; |
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} |
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AVOutputFormat ff_alsa_muxer = { |
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.name = "alsa", |
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.long_name = NULL_IF_CONFIG_SMALL("ALSA audio output"), |
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.priv_data_size = sizeof(AlsaData), |
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.audio_codec = DEFAULT_CODEC_ID, |
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.video_codec = AV_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 = ff_alsa_close, |
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.flags = AVFMT_NOFILE, |
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}; |
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@ -1,108 +0,0 @@ |
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/*
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* Linux audio grab interface |
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* Copyright (c) 2000, 2001 Fabrice Bellard |
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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 "config.h" |
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#if HAVE_SOUNDCARD_H |
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#include <soundcard.h> |
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#else |
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#include <sys/soundcard.h> |
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#endif |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <sys/ioctl.h> |
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#include "libavutil/internal.h" |
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#include "libavcodec/avcodec.h" |
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#include "libavformat/avformat.h" |
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#include "libavformat/internal.h" |
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#include "oss.h" |
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static int audio_write_header(AVFormatContext *s1) |
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{ |
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OSSAudioData *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->codecpar->sample_rate; |
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s->channels = st->codecpar->channels; |
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ret = ff_oss_audio_open(s1, 1, s1->filename); |
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if (ret < 0) { |
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return AVERROR(EIO); |
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} else { |
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return 0; |
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} |
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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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OSSAudioData *s = s1->priv_data; |
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int len, ret; |
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int size= pkt->size; |
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uint8_t *buf= pkt->data; |
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while (size > 0) { |
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len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size); |
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memcpy(s->buffer + s->buffer_ptr, buf, len); |
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s->buffer_ptr += len; |
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if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) { |
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for(;;) { |
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ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE); |
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if (ret > 0) |
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break; |
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if (ret < 0 && (errno != EAGAIN && errno != EINTR)) |
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return AVERROR(EIO); |
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} |
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s->buffer_ptr = 0; |
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} |
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buf += len; |
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size -= len; |
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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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OSSAudioData *s = s1->priv_data; |
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ff_oss_audio_close(s); |
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return 0; |
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} |
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AVOutputFormat ff_oss_muxer = { |
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.name = "oss", |
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.long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"), |
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.priv_data_size = sizeof(OSSAudioData), |
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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(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE), |
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.video_codec = AV_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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@ -1,95 +0,0 @@ |
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/*
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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 "libavutil/internal.h" |
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#include "libavformat/avformat.h" |
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#include "libavdevice/sndio.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->codecpar->sample_rate; |
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s->channels = st->codecpar->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(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE), |
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.video_codec = AV_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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Reference in new issue