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ffmpeg/libav/beosaudio.cpp

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/*
* BeOS audio play interface
* Copyright (c) 2000, 2001 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <Application.h>
#include <SoundPlayer.h>
extern "C" {
#include "avformat.h"
}
/* enable performance checks */
//#define PERF_CHECK
//const char *audio_device = "/dev/dsp";
const char *audio_device = "beosaudio:";
/* Pipes are 4k in BeOS IIRC */
#define AUDIO_BLOCK_SIZE 4096
//#define AUDIO_BLOCK_SIZE 2048
#define AUDIO_BLOCK_COUNT 8
#define AUDIO_BUFFER_SIZE (AUDIO_BLOCK_SIZE*AUDIO_BLOCK_COUNT)
/* pipes suck for realtime */
#define USE_RING_BUFFER 1
typedef struct {
int fd;
int sample_rate;
int channels;
int frame_size; /* in bytes ! */
CodecID codec_id;
int flip_left : 1;
UINT8 buffer[AUDIO_BUFFER_SIZE];
int buffer_ptr;
int pipefd; /* the other end of the pipe */
/* ring buffer */
sem_id input_sem;
int input_index;
sem_id output_sem;
int output_index;
int queued;
BSoundPlayer *player;
int has_quit; /* signal callbacks not to wait */
volatile bigtime_t starve_time;
} AudioData;
static thread_id main_thid;
static thread_id bapp_thid;
static int own_BApp_created = 0;
static int refcount = 0;
/* create the BApplication and Run() it */
static int32 bapp_thread(void *arg)
{
new BApplication("application/x-vnd.ffmpeg");
own_BApp_created = 1;
be_app->Run();
/* kill the process group */
// kill(0, SIGINT);
// kill(main_thid, SIGHUP);
return B_OK;
}
/* create the BApplication only if needed */
static void create_bapp_if_needed(void)
{
if (refcount++ == 0) {
/* needed by libmedia */
if (be_app == NULL) {
bapp_thid = spawn_thread(bapp_thread, "ffmpeg BApplication", B_NORMAL_PRIORITY, NULL);
resume_thread(bapp_thid);
while (!own_BApp_created)
snooze(50000);
}
}
}
static void destroy_bapp_if_needed(void)
{
if (--refcount == 0 && own_BApp_created) {
be_app->Lock();
be_app->Quit();
be_app = NULL;
}
}
/* called back by BSoundPlayer */
static void audioplay_callback(void *cookie, void *buffer, size_t bufferSize, const media_raw_audio_format &format)
{
AudioData *s;
size_t len, amount;
unsigned char *buf = (unsigned char *)buffer;
s = (AudioData *)cookie;
if (s->has_quit)
return;
while (bufferSize > 0) {
#ifdef PERF_CHECK
bigtime_t t;
t = system_time();
#endif
#ifdef USE_RING_BUFFER
len = MIN(AUDIO_BLOCK_SIZE, bufferSize);
if (acquire_sem_etc(s->output_sem, len, B_CAN_INTERRUPT, 0LL) < B_OK) {
s->has_quit = 1;
s->player->SetHasData(false);
return;
}
amount = MIN(len, (AUDIO_BUFFER_SIZE - s->output_index));
memcpy(buf, &s->buffer[s->output_index], amount);
s->output_index += amount;
if (s->output_index >= AUDIO_BUFFER_SIZE) {
s->output_index %= AUDIO_BUFFER_SIZE;
memcpy(buf + amount, &s->buffer[s->output_index], len - amount);
s->output_index += len-amount;
s->output_index %= AUDIO_BUFFER_SIZE;
}
release_sem_etc(s->input_sem, len, 0);
#else
len = read(s->pipefd, buf, bufferSize);
#endif
#ifdef PERF_CHECK
t = system_time() - t;
s->starve_time = MAX(s->starve_time, t);
#endif
#ifndef USE_RING_BUFFER
if (len < B_OK) {
puts("EPIPE");
s->player->SetHasData(false);
snooze(100000);
return;
}
if (len == 0) {
s->player->SetHasData(false);
snooze(100000);
return;
}
#endif
buf += len;
bufferSize -= len;
}
}
static int audio_open(AudioData *s, int is_output)
{
int p[2];
int ret;
media_raw_audio_format format;
if (!is_output)
return -EIO; /* not for now */
#ifdef USE_RING_BUFFER
s->input_sem = create_sem(AUDIO_BUFFER_SIZE, "ffmpeg_ringbuffer_input");
// s->input_sem = create_sem(AUDIO_BLOCK_SIZE, "ffmpeg_ringbuffer_input");
if (s->input_sem < B_OK)
return -EIO;
s->output_sem = create_sem(0, "ffmpeg_ringbuffer_output");
if (s->output_sem < B_OK) {
delete_sem(s->input_sem);
return -EIO;
}
s->input_index = 0;
s->output_index = 0;
s->queued = 0;
#else
ret = pipe(p);
if (ret < 0)
return -EIO;
s->fd = p[is_output?1:0];
s->pipefd = p[is_output?0:1];
if (s->fd < 0) {
perror(is_output?"audio out":"audio in");
return -EIO;
}
#endif
create_bapp_if_needed();
/* non blocking mode */
// fcntl(s->fd, F_SETFL, O_NONBLOCK);
// fcntl(s->pipefd, F_SETFL, O_NONBLOCK);
s->frame_size = AUDIO_BLOCK_SIZE;
format = media_raw_audio_format::wildcard;
format.format = media_raw_audio_format::B_AUDIO_SHORT;
format.byte_order = B_HOST_IS_LENDIAN ? B_MEDIA_LITTLE_ENDIAN : B_MEDIA_BIG_ENDIAN;
format.channel_count = s->channels;
format.buffer_size = s->frame_size;
format.frame_rate = s->sample_rate;
s->player = new BSoundPlayer(&format, "ffmpeg output", audioplay_callback);
if (s->player->InitCheck() != B_OK) {
delete s->player;
s->player = NULL;
#ifdef USE_RING_BUFFER
if (s->input_sem)
delete_sem(s->input_sem);
if (s->output_sem)
delete_sem(s->output_sem);
#else
close(s->fd);
close(s->pipefd);
#endif
return -EIO;
}
s->player->SetCookie(s);
s->player->SetVolume(1.0);
s->player->Start();
s->player->SetHasData(true);
/* bump up the priority (avoid realtime though) */
// set_thread_priority(find_thread(NULL), B_URGENT_DISPLAY_PRIORITY+1);
// set_thread_priority(find_thread(NULL), B_LOW_PRIORITY);
return 0;
}
static int audio_close(AudioData *s)
{
#ifdef USE_RING_BUFFER
if (s->input_sem)
delete_sem(s->input_sem);
if (s->output_sem)
delete_sem(s->output_sem);
#endif
s->has_quit = 1;
if (s->player) {
s->player->Stop();
}
if (s->player)
delete s->player;
#ifndef USE_RING_BUFFER
close(s->pipefd);
close(s->fd);
#endif
destroy_bapp_if_needed();
return 0;
}
/* sound output support */
static int audio_write_header(AVFormatContext *s1)
{
AudioData *s = (AudioData *)s1->priv_data;
AVStream *st;
int ret;
st = s1->streams[0];
s->sample_rate = st->codec.sample_rate;
s->channels = st->codec.channels;
ret = audio_open(s, 1);
if (ret < 0)
return -EIO;
return 0;
}
static int audio_write_packet(AVFormatContext *s1, int stream_index,
UINT8 *buf, int size, int force_pts)
{
AudioData *s = (AudioData *)s1->priv_data;
int len, ret;
#ifdef PERF_CHECK
bigtime_t t = s->starve_time;
s->starve_time = 0;
printf("starve_time: %lld \n", t);
#endif
#ifdef USE_RING_BUFFER
while (size > 0) {
int amount;
len = MIN(size, AUDIO_BLOCK_SIZE);
if (acquire_sem_etc(s->input_sem, len, B_CAN_INTERRUPT, 0LL) < B_OK)
return -EIO;
amount = MIN(len, (AUDIO_BUFFER_SIZE - s->input_index));
memcpy(&s->buffer[s->input_index], buf, amount);
s->input_index += amount;
if (s->input_index >= AUDIO_BUFFER_SIZE) {
s->input_index %= AUDIO_BUFFER_SIZE;
memcpy(&s->buffer[s->input_index], buf + amount, len - amount);
s->input_index += len - amount;
}
release_sem_etc(s->output_sem, len, 0);
buf += len;
size -= len;
}
#else
while (size > 0) {
len = AUDIO_BLOCK_SIZE - s->buffer_ptr;
if (len > size)
len = size;
memcpy(s->buffer + s->buffer_ptr, buf, len);
s->buffer_ptr += len;
if (s->buffer_ptr >= AUDIO_BLOCK_SIZE) {
for(;;) {
//snooze(1000);
ret = write(s->fd, s->buffer, AUDIO_BLOCK_SIZE);
if (ret != 0)
break;
if (ret < 0 && (errno != EAGAIN && errno != EINTR))
return -EIO;
}
s->buffer_ptr = 0;
}
buf += len;
size -= len;
}
#endif
return 0;
}
static int audio_write_trailer(AVFormatContext *s1)
{
AudioData *s = (AudioData *)s1->priv_data;
audio_close(s);
return 0;
}
/* grab support */
static int audio_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
AudioData *s = (AudioData *)s1->priv_data;
AVStream *st;
int ret;
if (!ap || ap->sample_rate <= 0 || ap->channels <= 0)
return -1;
st = av_new_stream(s1, 0);
if (!st) {
return -ENOMEM;
}
s->sample_rate = ap->sample_rate;
s->channels = ap->channels;
ret = audio_open(s, 0);
if (ret < 0) {
av_free(st);
return -EIO;
} else {
/* take real parameters */
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = s->codec_id;
st->codec.sample_rate = s->sample_rate;
st->codec.channels = s->channels;
return 0;
}
}
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
AudioData *s = (AudioData *)s1->priv_data;
int ret;
if (av_new_packet(pkt, s->frame_size) < 0)
return -EIO;
for(;;) {
ret = read(s->fd, pkt->data, pkt->size);
if (ret > 0)
break;
if (ret == -1 && (errno == EAGAIN || errno == EINTR)) {
av_free_packet(pkt);
pkt->size = 0;
return 0;
}
if (!(ret == 0 || (ret == -1 && (errno == EAGAIN || errno == EINTR)))) {
av_free_packet(pkt);
return -EIO;
}
}
pkt->size = ret;
if (s->flip_left && s->channels == 2) {
int i;
short *p = (short *) pkt->data;
for (i = 0; i < ret; i += 4) {
*p = ~*p;
p += 2;
}
}
return 0;
}
static int audio_read_close(AVFormatContext *s1)
{
AudioData *s = (AudioData *)s1->priv_data;
audio_close(s);
return 0;
}
AVInputFormat audio_in_format = {
"audio_device",
"audio grab and output",
sizeof(AudioData),
NULL,
audio_read_header,
audio_read_packet,
audio_read_close,
NULL,
AVFMT_NOFILE,
};
AVOutputFormat audio_out_format = {
"audio_device",
"audio grab and output",
"",
"",
sizeof(AudioData),
#ifdef WORDS_BIGENDIAN
CODEC_ID_PCM_S16BE,
#else
CODEC_ID_PCM_S16LE,
#endif
CODEC_ID_NONE,
audio_write_header,
audio_write_packet,
audio_write_trailer,
AVFMT_NOFILE,
};
extern "C" {
int audio_init(void)
{
main_thid = find_thread(NULL);
av_register_input_format(&audio_in_format);
av_register_output_format(&audio_out_format);
return 0;
}
} // "C"
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