mirror of https://github.com/FFmpeg/FFmpeg.git
Patch by Olivier Guilyardi list samalyse com. See the thread: "[FFmpeg-devel] [PATCH] libavdevice: JACK demuxer". Originally committed as revision 18322 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Olivier Guilyardi
16 years ago
committed by
Stefano Sabatini
parent
7b09db3522
commit
80ff8a16f5
7 changed files with 337 additions and 1 deletions
@ -0,0 +1,326 @@ |
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/*
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* JACK Audio Connection Kit input device |
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* Copyright (c) 2009 Samalyse |
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* Author: Olivier Guilyardi <olivier samalyse com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include <semaphore.h> |
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#include <jack/jack.h> |
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#include "libavutil/log.h" |
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#include "libavutil/fifo.h" |
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#include "libavcodec/avcodec.h" |
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#include "libavformat/avformat.h" |
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#include "libavformat/timefilter.h" |
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/**
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* Size of the internal FIFO buffers as a number of audio packets |
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*/ |
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#define FIFO_PACKETS_NUM 16 |
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typedef struct { |
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jack_client_t * client; |
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int activated; |
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sem_t packet_count; |
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jack_nframes_t sample_rate; |
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jack_nframes_t buffer_size; |
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jack_port_t ** ports; |
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int nports; |
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TimeFilter * timefilter; |
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AVFifoBuffer * new_pkts; |
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AVFifoBuffer * filled_pkts; |
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int pkt_xrun; |
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int jack_xrun; |
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} JackData; |
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static int process_callback(jack_nframes_t nframes, void *arg) |
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{ |
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/* Warning: this function runs in realtime. One mustn't allocate memory here
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* or do any other thing that could block. */ |
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int i, j; |
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JackData *self = arg; |
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float * buffer; |
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jack_nframes_t latency, cycle_delay; |
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AVPacket pkt; |
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float *pkt_data; |
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double cycle_time; |
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if (!self->client) |
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return 0; |
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/* The approximate delay since the hardware interrupt as a number of frames */ |
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cycle_delay = jack_frames_since_cycle_start(self->client); |
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/* Retrieve filtered cycle time */ |
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cycle_time = ff_timefilter_update(self->timefilter, |
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av_gettime() / 1000000.0 - (double) cycle_delay / self->sample_rate, |
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self->buffer_size); |
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/* Check if an empty packet is available, and if there's enough space to send it back once filled */ |
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if ((av_fifo_size(self->new_pkts) < sizeof(pkt)) || (av_fifo_space(self->filled_pkts) < sizeof(pkt))) { |
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self->pkt_xrun = 1; |
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return 0; |
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} |
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/* Retrieve empty (but allocated) packet */ |
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av_fifo_generic_read(self->new_pkts, &pkt, sizeof(pkt), NULL); |
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pkt_data = (float *) pkt.data; |
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latency = 0; |
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/* Copy and interleave audio data from the JACK buffer into the packet */ |
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for (i = 0; i < self->nports; i++) { |
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latency += jack_port_get_total_latency(self->client, self->ports[i]); |
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buffer = jack_port_get_buffer(self->ports[i], self->buffer_size); |
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for (j = 0; j < self->buffer_size; j++) |
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pkt_data[j * self->nports + i] = buffer[j]; |
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} |
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/* Timestamp the packet with the cycle start time minus the average latency */ |
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pkt.pts = (cycle_time - (double) latency / (self->nports * self->sample_rate)) * 1000000.0; |
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/* Send the now filled packet back, and increase packet counter */ |
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av_fifo_generic_write(self->filled_pkts, &pkt, sizeof(pkt), NULL); |
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sem_post(&self->packet_count); |
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return 0; |
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} |
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static void shutdown_callback(void *arg) |
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{ |
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JackData *self = arg; |
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self->client = NULL; |
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} |
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static int xrun_callback(void *arg) |
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{ |
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JackData *self = arg; |
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self->jack_xrun = 1; |
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ff_timefilter_reset(self->timefilter); |
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return 0; |
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} |
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static int supply_new_packets(JackData *self, AVFormatContext *context) |
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{ |
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AVPacket pkt; |
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int test, pkt_size = self->buffer_size * self->nports * sizeof(float); |
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/* Supply the process callback with new empty packets, by filling the new
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* packets FIFO buffer with as many packets as possible. process_callback() |
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* can't do this by itself, because it can't allocate memory in realtime. */ |
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while (av_fifo_space(self->new_pkts) >= sizeof(pkt)) { |
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if ((test = av_new_packet(&pkt, pkt_size)) < 0) { |
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av_log(context, AV_LOG_ERROR, "Could not create packet of size %d\n", pkt_size); |
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return test; |
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} |
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av_fifo_generic_write(self->new_pkts, &pkt, sizeof(pkt), NULL); |
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} |
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return 0; |
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} |
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static int start_jack(AVFormatContext *context, AVFormatParameters *params) |
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{ |
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JackData *self = context->priv_data; |
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jack_status_t status; |
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int i, test; |
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double o, period; |
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/* Register as a JACK client, using the context filename as client name. */ |
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self->client = jack_client_open(context->filename, 0, &status); |
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if (!self->client) { |
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av_log(context, AV_LOG_ERROR, "Unable to register as a JACK client\n"); |
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return AVERROR(EIO); |
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} |
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sem_init(&self->packet_count, 0, 0); |
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self->sample_rate = jack_get_sample_rate(self->client); |
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self->nports = params->channels; |
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self->ports = av_malloc(self->nports * sizeof(*self->ports)); |
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self->buffer_size = jack_get_buffer_size(self->client); |
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/* Register JACK ports */ |
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for (i = 0; i < self->nports; i++) { |
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char str[16]; |
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snprintf(str, sizeof(str), "input_%d", i + 1); |
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self->ports[i] = jack_port_register(self->client, str, |
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JACK_DEFAULT_AUDIO_TYPE, |
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JackPortIsInput, 0); |
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if (!self->ports[i]) { |
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av_log(context, AV_LOG_ERROR, "Unable to register port %s:%s\n", |
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context->filename, str); |
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jack_client_close(self->client); |
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return AVERROR(EIO); |
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} |
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} |
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/* Register JACK callbacks */ |
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jack_set_process_callback(self->client, process_callback, self); |
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jack_on_shutdown(self->client, shutdown_callback, self); |
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jack_set_xrun_callback(self->client, xrun_callback, self); |
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/* Create time filter */ |
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period = (double) self->buffer_size / self->sample_rate; |
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o = 2 * M_PI * 1.5 * period; /// bandwidth: 1.5Hz
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self->timefilter = ff_timefilter_new (1.0 / self->sample_rate, sqrt(2 * o), o * o); |
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/* Create FIFO buffers */ |
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self->filled_pkts = av_fifo_alloc(FIFO_PACKETS_NUM * sizeof(AVPacket)); |
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/* New packets FIFO with one extra packet for safety against underruns */ |
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self->new_pkts = av_fifo_alloc((FIFO_PACKETS_NUM + 1) * sizeof(AVPacket)); |
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if ((test = supply_new_packets(self, context))) { |
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jack_client_close(self->client); |
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return test; |
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} |
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return 0; |
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} |
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static void free_pkt_fifo(AVFifoBuffer *fifo) |
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{ |
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AVPacket pkt; |
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while (av_fifo_size(fifo)) { |
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av_fifo_generic_read(fifo, &pkt, sizeof(pkt), NULL); |
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av_free_packet(&pkt); |
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} |
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av_fifo_free(fifo); |
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} |
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static void stop_jack(JackData *self) |
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{ |
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if (self->client) { |
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if (self->activated) |
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jack_deactivate(self->client); |
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jack_client_close(self->client); |
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} |
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sem_destroy(&self->packet_count); |
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free_pkt_fifo(self->new_pkts); |
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free_pkt_fifo(self->filled_pkts); |
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av_freep(&self->ports); |
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ff_timefilter_destroy(self->timefilter); |
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} |
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static int audio_read_header(AVFormatContext *context, AVFormatParameters *params) |
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{ |
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JackData *self = context->priv_data; |
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AVStream *stream; |
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int test; |
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if (params->sample_rate <= 0 || params->channels <= 0) |
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return -1; |
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if ((test = start_jack(context, params))) |
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return test; |
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stream = av_new_stream(context, 0); |
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if (!stream) { |
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stop_jack(self); |
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return AVERROR(ENOMEM); |
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} |
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stream->codec->codec_type = CODEC_TYPE_AUDIO; |
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#ifdef WORDS_BIGENDIAN |
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stream->codec->codec_id = CODEC_ID_PCM_F32BE; |
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#else |
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stream->codec->codec_id = CODEC_ID_PCM_F32LE; |
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#endif |
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stream->codec->sample_rate = self->sample_rate; |
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stream->codec->channels = self->nports; |
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av_set_pts_info(stream, 64, 1, 1000000); /* 64 bits pts in us */ |
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return 0; |
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} |
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static int audio_read_packet(AVFormatContext *context, AVPacket *pkt) |
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{ |
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JackData *self = context->priv_data; |
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struct timespec timeout = {0, 0}; |
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int test; |
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/* Activate the JACK client on first packet read. Activating the JACK client
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* means that process_callback() starts to get called at regular interval. |
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* If we activate it in audio_read_header(), we're actually reading audio data |
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* from the device before instructed to, and that may result in an overrun. */ |
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if (!self->activated) { |
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if (!jack_activate(self->client)) { |
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self->activated = 1; |
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av_log(context, AV_LOG_INFO, |
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"JACK client registered and activated (rate=%dHz, buffer_size=%d frames)\n", |
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self->sample_rate, self->buffer_size); |
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} else { |
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av_log(context, AV_LOG_ERROR, "Unable to activate JACK client\n"); |
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return AVERROR(EIO); |
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} |
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} |
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/* Wait for a packet comming back from process_callback(), if one isn't available yet */ |
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timeout.tv_sec = av_gettime() / 1000000 + 2; |
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if (sem_timedwait(&self->packet_count, &timeout)) { |
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if (errno == ETIMEDOUT) { |
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av_log(context, AV_LOG_ERROR, |
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"Input error: timed out when waiting for JACK process callback output\n"); |
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} else { |
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av_log(context, AV_LOG_ERROR, "Error while waiting for audio packet: %s\n", |
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strerror(errno)); |
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} |
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if (!self->client) |
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av_log(context, AV_LOG_ERROR, "Input error: JACK server is gone\n"); |
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return AVERROR(EIO); |
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} |
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if (self->pkt_xrun) { |
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av_log(context, AV_LOG_WARNING, "Audio packet xrun\n"); |
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self->pkt_xrun = 0; |
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} |
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if (self->jack_xrun) { |
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av_log(context, AV_LOG_WARNING, "JACK xrun\n"); |
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self->jack_xrun = 0; |
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} |
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/* Retrieve the packet filled with audio data by process_callback() */ |
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av_fifo_generic_read(self->filled_pkts, pkt, sizeof(*pkt), NULL); |
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if ((test = supply_new_packets(self, context))) |
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return test; |
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return 0; |
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} |
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static int audio_read_close(AVFormatContext *context) |
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{ |
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JackData *self = context->priv_data; |
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stop_jack(self); |
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return 0; |
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} |
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AVInputFormat jack_demuxer = { |
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"jack", |
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NULL_IF_CONFIG_SMALL("JACK Audio Connection Kit"), |
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sizeof(JackData), |
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NULL, |
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audio_read_header, |
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audio_read_packet, |
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audio_read_close, |
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.flags = AVFMT_NOFILE, |
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}; |
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