mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
338 lines
11 KiB
338 lines
11 KiB
/* |
|
* JACK Audio Connection Kit input device |
|
* Copyright (c) 2009 Samalyse |
|
* Author: Olivier Guilyardi <olivier samalyse com> |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include "config.h" |
|
#include <semaphore.h> |
|
#include <jack/jack.h> |
|
|
|
#include "libavutil/log.h" |
|
#include "libavutil/fifo.h" |
|
#include "libavutil/opt.h" |
|
#include "libavcodec/avcodec.h" |
|
#include "libavformat/avformat.h" |
|
#include "libavformat/timefilter.h" |
|
|
|
/** |
|
* Size of the internal FIFO buffers as a number of audio packets |
|
*/ |
|
#define FIFO_PACKETS_NUM 16 |
|
|
|
typedef struct { |
|
AVClass *class; |
|
jack_client_t * client; |
|
int activated; |
|
sem_t packet_count; |
|
jack_nframes_t sample_rate; |
|
jack_nframes_t buffer_size; |
|
jack_port_t ** ports; |
|
int nports; |
|
TimeFilter * timefilter; |
|
AVFifoBuffer * new_pkts; |
|
AVFifoBuffer * filled_pkts; |
|
int pkt_xrun; |
|
int jack_xrun; |
|
} JackData; |
|
|
|
static int process_callback(jack_nframes_t nframes, void *arg) |
|
{ |
|
/* Warning: this function runs in realtime. One mustn't allocate memory here |
|
* or do any other thing that could block. */ |
|
|
|
int i, j; |
|
JackData *self = arg; |
|
float * buffer; |
|
jack_nframes_t latency, cycle_delay; |
|
AVPacket pkt; |
|
float *pkt_data; |
|
double cycle_time; |
|
|
|
if (!self->client) |
|
return 0; |
|
|
|
/* The approximate delay since the hardware interrupt as a number of frames */ |
|
cycle_delay = jack_frames_since_cycle_start(self->client); |
|
|
|
/* Retrieve filtered cycle time */ |
|
cycle_time = ff_timefilter_update(self->timefilter, |
|
av_gettime() / 1000000.0 - (double) cycle_delay / self->sample_rate, |
|
self->buffer_size); |
|
|
|
/* Check if an empty packet is available, and if there's enough space to send it back once filled */ |
|
if ((av_fifo_size(self->new_pkts) < sizeof(pkt)) || (av_fifo_space(self->filled_pkts) < sizeof(pkt))) { |
|
self->pkt_xrun = 1; |
|
return 0; |
|
} |
|
|
|
/* Retrieve empty (but allocated) packet */ |
|
av_fifo_generic_read(self->new_pkts, &pkt, sizeof(pkt), NULL); |
|
|
|
pkt_data = (float *) pkt.data; |
|
latency = 0; |
|
|
|
/* Copy and interleave audio data from the JACK buffer into the packet */ |
|
for (i = 0; i < self->nports; i++) { |
|
latency += jack_port_get_total_latency(self->client, self->ports[i]); |
|
buffer = jack_port_get_buffer(self->ports[i], self->buffer_size); |
|
for (j = 0; j < self->buffer_size; j++) |
|
pkt_data[j * self->nports + i] = buffer[j]; |
|
} |
|
|
|
/* Timestamp the packet with the cycle start time minus the average latency */ |
|
pkt.pts = (cycle_time - (double) latency / (self->nports * self->sample_rate)) * 1000000.0; |
|
|
|
/* Send the now filled packet back, and increase packet counter */ |
|
av_fifo_generic_write(self->filled_pkts, &pkt, sizeof(pkt), NULL); |
|
sem_post(&self->packet_count); |
|
|
|
return 0; |
|
} |
|
|
|
static void shutdown_callback(void *arg) |
|
{ |
|
JackData *self = arg; |
|
self->client = NULL; |
|
} |
|
|
|
static int xrun_callback(void *arg) |
|
{ |
|
JackData *self = arg; |
|
self->jack_xrun = 1; |
|
ff_timefilter_reset(self->timefilter); |
|
return 0; |
|
} |
|
|
|
static int supply_new_packets(JackData *self, AVFormatContext *context) |
|
{ |
|
AVPacket pkt; |
|
int test, pkt_size = self->buffer_size * self->nports * sizeof(float); |
|
|
|
/* Supply the process callback with new empty packets, by filling the new |
|
* packets FIFO buffer with as many packets as possible. process_callback() |
|
* can't do this by itself, because it can't allocate memory in realtime. */ |
|
while (av_fifo_space(self->new_pkts) >= sizeof(pkt)) { |
|
if ((test = av_new_packet(&pkt, pkt_size)) < 0) { |
|
av_log(context, AV_LOG_ERROR, "Could not create packet of size %d\n", pkt_size); |
|
return test; |
|
} |
|
av_fifo_generic_write(self->new_pkts, &pkt, sizeof(pkt), NULL); |
|
} |
|
return 0; |
|
} |
|
|
|
static int start_jack(AVFormatContext *context) |
|
{ |
|
JackData *self = context->priv_data; |
|
jack_status_t status; |
|
int i, test; |
|
double o, period; |
|
|
|
/* Register as a JACK client, using the context filename as client name. */ |
|
self->client = jack_client_open(context->filename, JackNullOption, &status); |
|
if (!self->client) { |
|
av_log(context, AV_LOG_ERROR, "Unable to register as a JACK client\n"); |
|
return AVERROR(EIO); |
|
} |
|
|
|
sem_init(&self->packet_count, 0, 0); |
|
|
|
self->sample_rate = jack_get_sample_rate(self->client); |
|
self->ports = av_malloc(self->nports * sizeof(*self->ports)); |
|
self->buffer_size = jack_get_buffer_size(self->client); |
|
|
|
/* Register JACK ports */ |
|
for (i = 0; i < self->nports; i++) { |
|
char str[16]; |
|
snprintf(str, sizeof(str), "input_%d", i + 1); |
|
self->ports[i] = jack_port_register(self->client, str, |
|
JACK_DEFAULT_AUDIO_TYPE, |
|
JackPortIsInput, 0); |
|
if (!self->ports[i]) { |
|
av_log(context, AV_LOG_ERROR, "Unable to register port %s:%s\n", |
|
context->filename, str); |
|
jack_client_close(self->client); |
|
return AVERROR(EIO); |
|
} |
|
} |
|
|
|
/* Register JACK callbacks */ |
|
jack_set_process_callback(self->client, process_callback, self); |
|
jack_on_shutdown(self->client, shutdown_callback, self); |
|
jack_set_xrun_callback(self->client, xrun_callback, self); |
|
|
|
/* Create time filter */ |
|
period = (double) self->buffer_size / self->sample_rate; |
|
o = 2 * M_PI * 1.5 * period; /// bandwidth: 1.5Hz |
|
self->timefilter = ff_timefilter_new (1.0 / self->sample_rate, sqrt(2 * o), o * o); |
|
|
|
/* Create FIFO buffers */ |
|
self->filled_pkts = av_fifo_alloc(FIFO_PACKETS_NUM * sizeof(AVPacket)); |
|
/* New packets FIFO with one extra packet for safety against underruns */ |
|
self->new_pkts = av_fifo_alloc((FIFO_PACKETS_NUM + 1) * sizeof(AVPacket)); |
|
if ((test = supply_new_packets(self, context))) { |
|
jack_client_close(self->client); |
|
return test; |
|
} |
|
|
|
return 0; |
|
|
|
} |
|
|
|
static void free_pkt_fifo(AVFifoBuffer *fifo) |
|
{ |
|
AVPacket pkt; |
|
while (av_fifo_size(fifo)) { |
|
av_fifo_generic_read(fifo, &pkt, sizeof(pkt), NULL); |
|
av_free_packet(&pkt); |
|
} |
|
av_fifo_free(fifo); |
|
} |
|
|
|
static void stop_jack(JackData *self) |
|
{ |
|
if (self->client) { |
|
if (self->activated) |
|
jack_deactivate(self->client); |
|
jack_client_close(self->client); |
|
} |
|
sem_destroy(&self->packet_count); |
|
free_pkt_fifo(self->new_pkts); |
|
free_pkt_fifo(self->filled_pkts); |
|
av_freep(&self->ports); |
|
ff_timefilter_destroy(self->timefilter); |
|
} |
|
|
|
static int audio_read_header(AVFormatContext *context, AVFormatParameters *params) |
|
{ |
|
JackData *self = context->priv_data; |
|
AVStream *stream; |
|
int test; |
|
|
|
if ((test = start_jack(context))) |
|
return test; |
|
|
|
stream = av_new_stream(context, 0); |
|
if (!stream) { |
|
stop_jack(self); |
|
return AVERROR(ENOMEM); |
|
} |
|
|
|
stream->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
#if HAVE_BIGENDIAN |
|
stream->codec->codec_id = CODEC_ID_PCM_F32BE; |
|
#else |
|
stream->codec->codec_id = CODEC_ID_PCM_F32LE; |
|
#endif |
|
stream->codec->sample_rate = self->sample_rate; |
|
stream->codec->channels = self->nports; |
|
|
|
av_set_pts_info(stream, 64, 1, 1000000); /* 64 bits pts in us */ |
|
return 0; |
|
} |
|
|
|
static int audio_read_packet(AVFormatContext *context, AVPacket *pkt) |
|
{ |
|
JackData *self = context->priv_data; |
|
struct timespec timeout = {0, 0}; |
|
int test; |
|
|
|
/* Activate the JACK client on first packet read. Activating the JACK client |
|
* means that process_callback() starts to get called at regular interval. |
|
* If we activate it in audio_read_header(), we're actually reading audio data |
|
* from the device before instructed to, and that may result in an overrun. */ |
|
if (!self->activated) { |
|
if (!jack_activate(self->client)) { |
|
self->activated = 1; |
|
av_log(context, AV_LOG_INFO, |
|
"JACK client registered and activated (rate=%dHz, buffer_size=%d frames)\n", |
|
self->sample_rate, self->buffer_size); |
|
} else { |
|
av_log(context, AV_LOG_ERROR, "Unable to activate JACK client\n"); |
|
return AVERROR(EIO); |
|
} |
|
} |
|
|
|
/* Wait for a packet comming back from process_callback(), if one isn't available yet */ |
|
timeout.tv_sec = av_gettime() / 1000000 + 2; |
|
if (sem_timedwait(&self->packet_count, &timeout)) { |
|
if (errno == ETIMEDOUT) { |
|
av_log(context, AV_LOG_ERROR, |
|
"Input error: timed out when waiting for JACK process callback output\n"); |
|
} else { |
|
av_log(context, AV_LOG_ERROR, "Error while waiting for audio packet: %s\n", |
|
strerror(errno)); |
|
} |
|
if (!self->client) |
|
av_log(context, AV_LOG_ERROR, "Input error: JACK server is gone\n"); |
|
|
|
return AVERROR(EIO); |
|
} |
|
|
|
if (self->pkt_xrun) { |
|
av_log(context, AV_LOG_WARNING, "Audio packet xrun\n"); |
|
self->pkt_xrun = 0; |
|
} |
|
|
|
if (self->jack_xrun) { |
|
av_log(context, AV_LOG_WARNING, "JACK xrun\n"); |
|
self->jack_xrun = 0; |
|
} |
|
|
|
/* Retrieve the packet filled with audio data by process_callback() */ |
|
av_fifo_generic_read(self->filled_pkts, pkt, sizeof(*pkt), NULL); |
|
|
|
if ((test = supply_new_packets(self, context))) |
|
return test; |
|
|
|
return 0; |
|
} |
|
|
|
static int audio_read_close(AVFormatContext *context) |
|
{ |
|
JackData *self = context->priv_data; |
|
stop_jack(self); |
|
return 0; |
|
} |
|
|
|
#define OFFSET(x) offsetof(JackData, x) |
|
static const AVOption options[] = { |
|
{ "channels", "Number of audio channels.", OFFSET(nports), FF_OPT_TYPE_INT, { 2 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
|
{ NULL }, |
|
}; |
|
|
|
static const AVClass jack_indev_class = { |
|
.class_name = "JACK indev", |
|
.item_name = av_default_item_name, |
|
.option = options, |
|
.version = LIBAVUTIL_VERSION_INT, |
|
}; |
|
|
|
AVInputFormat ff_jack_demuxer = { |
|
"jack", |
|
NULL_IF_CONFIG_SMALL("JACK Audio Connection Kit"), |
|
sizeof(JackData), |
|
NULL, |
|
audio_read_header, |
|
audio_read_packet, |
|
audio_read_close, |
|
.flags = AVFMT_NOFILE, |
|
.priv_class = &jack_indev_class, |
|
};
|
|
|