diff options
Diffstat (limited to 'libavdevice/pulse_audio_enc.c')
| -rw-r--r-- | libavdevice/pulse_audio_enc.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/libavdevice/pulse_audio_enc.c b/libavdevice/pulse_audio_enc.c new file mode 100644 index 0000000000..591e518824 --- /dev/null +++ b/libavdevice/pulse_audio_enc.c @@ -0,0 +1,167 @@ +/* + * Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com> + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <pulse/simple.h> +#include <pulse/error.h> +#include "libavformat/avformat.h" +#include "libavformat/internal.h" +#include "libavutil/opt.h" +#include "libavutil/time.h" +#include "libavutil/log.h" +#include "pulse_audio_common.h" + +typedef struct PulseData { + AVClass *class; + const char *server; + const char *name; + const char *stream_name; + const char *device; + pa_simple *pa; + int64_t timestamp; +} PulseData; + +static av_cold int pulse_write_header(AVFormatContext *h) +{ + PulseData *s = h->priv_data; + AVStream *st = NULL; + int ret; + pa_sample_spec ss; + pa_buffer_attr attr = { -1, -1, -1, -1, -1 }; + const char *stream_name = s->stream_name; + + if (h->nb_streams != 1 || h->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO) { + av_log(s, AV_LOG_ERROR, "Only a single audio stream is supported.\n"); + return AVERROR(EINVAL); + } + st = h->streams[0]; + + if (!stream_name) { + if (h->filename[0]) + stream_name = h->filename; + else + stream_name = "Playback"; + } + + ss.format = codec_id_to_pulse_format(st->codec->codec_id); + ss.rate = st->codec->sample_rate; + ss.channels = st->codec->channels; + + s->pa = pa_simple_new(s->server, // Server + s->name, // Application name + PA_STREAM_PLAYBACK, + s->device, // Device + stream_name, // Description of a stream + &ss, // Sample format + NULL, // Use default channel map + &attr, // Buffering attributes + &ret); // Result + + if (!s->pa) { + av_log(s, AV_LOG_ERROR, "pa_simple_new failed: %s\n", pa_strerror(ret)); + return AVERROR(EIO); + } + + avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ + + return 0; +} + +static av_cold int pulse_write_trailer(AVFormatContext *h) +{ + PulseData *s = h->priv_data; + pa_simple_flush(s->pa, NULL); + pa_simple_free(s->pa); + s->pa = NULL; + return 0; +} + +static int pulse_write_packet(AVFormatContext *h, AVPacket *pkt) +{ + PulseData *s = h->priv_data; + int error; + + if (!pkt) { + if (pa_simple_flush(s->pa, &error) < 0) { + av_log(s, AV_LOG_ERROR, "pa_simple_flush failed: %s\n", pa_strerror(error)); + return AVERROR(EIO); + } + return 0; + } + + if (pkt->dts != AV_NOPTS_VALUE) + s->timestamp = pkt->dts; + + if (pkt->duration) { + s->timestamp += pkt->duration; + } else { + AVStream *st = h->streams[0]; + AVCodecContext *codec_ctx = st->codec; + AVRational r = { 1, codec_ctx->sample_rate }; + int64_t samples = pkt->size / (av_get_bytes_per_sample(codec_ctx->sample_fmt) * codec_ctx->channels); + s->timestamp += av_rescale_q(samples, r, st->time_base); + } + + if (pa_simple_write(s->pa, pkt->data, pkt->size, &error) < 0) { + av_log(s, AV_LOG_ERROR, "pa_simple_write failed: %s\n", pa_strerror(error)); + return AVERROR(EIO); + } + + return 0; +} + +static void pulse_get_output_timestamp(AVFormatContext *h, int stream, int64_t *dts, int64_t *wall) +{ + PulseData *s = h->priv_data; + pa_usec_t latency = pa_simple_get_latency(s->pa, NULL); + *wall = av_gettime(); + *dts = s->timestamp - latency; +} + +#define OFFSET(a) offsetof(PulseData, a) +#define E AV_OPT_FLAG_ENCODING_PARAM + +static const AVOption options[] = { + { "server", "set PulseAudio server", OFFSET(server), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + { "name", "set application name", OFFSET(name), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, E }, + { "stream_name", "set stream description", OFFSET(stream_name), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + { "device", "set device name", OFFSET(device), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, + { NULL } +}; + +static const AVClass pulse_muxer_class = { + .class_name = "Pulse muxer", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVOutputFormat ff_pulse_muxer = { + .name = "pulse", + .long_name = NULL_IF_CONFIG_SMALL("Pulse audio output"), + .priv_data_size = sizeof(PulseData), + .audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE), + .video_codec = AV_CODEC_ID_NONE, + .write_header = pulse_write_header, + .write_packet = pulse_write_packet, + .write_trailer = pulse_write_trailer, + .get_output_timestamp = pulse_get_output_timestamp, + .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH, + .priv_class = &pulse_muxer_class, +}; |