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mpv/stream/stream_radio.c
Stefano Pigozzi 37388ebb0e configure: uniform the defines to #define HAVE_xxx (0|1) 
The configure followed 5 different convetions of defines because the next guy
always wanted to introduce a new better way to uniform it[1]. For an
hypothetic feature 'hurr' you could have had:

  * #define HAVE_HURR 1   / #undef HAVE_DURR
  * #define HAVE_HURR     / #undef HAVE_DURR
  * #define CONFIG_HURR 1 / #undef CONFIG_DURR
  * #define HAVE_HURR 1   / #define HAVE_DURR 0
  * #define CONFIG_HURR 1 / #define CONFIG_DURR 0

All is now uniform and uses:
  * #define HAVE_HURR 1
  * #define HAVE_DURR 0

We like definining to 0 as opposed to `undef` bcause it can help spot typos
and is very helpful when doing big reorganizations in the code.

[1]: http://xkcd.com/927/ related
2013-11-03 21:59:54 +01:00

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/*
* radio support
*
* Abilities:
* * Listening v4l compatible radio cards using line-in or
* similar cable
* * Grabbing audio data using -ao pcm or -dumpaudio
* (must be compiled with --enable-radio-capture).
*
* Initially written by Vladimir Voroshilov <voroshil@univer.omsk.su>.
* Based on tv.c and tvi_v4l2.c code.
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <unistd.h>
#include <linux/types.h>
#if HAVE_RADIO_V4L2
#include <linux/videodev2.h>
#endif
#include "stream.h"
#include "demux/demux.h"
#include "mpvcore/m_option.h"
#include "mpvcore/mp_msg.h"
#include "stream_radio.h"
#include "libavutil/avstring.h"
#if HAVE_RADIO_CAPTURE
#include "audio_in.h"
#if HAVE_SYS_SOUNDCARD_H
#include <sys/soundcard.h>
#else
#if HAVE_SOUNDCARD_H
#include <soundcard.h>
#else
#include <linux/soundcard.h>
#endif
#endif
#endif
typedef struct radio_channels_s {
int index; ///< channel index in channels list
float freq; ///< frequency in MHz
char name[20]; ///< channel name
struct radio_channels_s * next;
struct radio_channels_s * prev;
} radio_channels_t;
/// default values for options
radio_param_t stream_radio_defaults={
"/dev/radio0", //device;
"default", //driver
NULL, //channels
100, //volume
NULL, //adevice
44100, //arate
2, //achannels
0, //freq_channel
NULL, //capture
};
typedef struct radio_priv_s {
int radio_fd; ///< radio device descriptor
int frac; ///< fraction value (see comment to init_frac)
radio_channels_t* radio_channel_list;
radio_channels_t* radio_channel_current;
float rangelow; ///< lowest tunable frequency in MHz
float rangehigh; ///< highest tunable frequency in MHz
const struct radio_driver_s* driver;
int old_snd_volume;
#if HAVE_RADIO_CAPTURE
volatile int do_capture; ///< is capture enabled
audio_in_t audio_in;
unsigned char* audio_ringbuffer;
int audio_head; ///< start of meanfull data in ringbuffer
int audio_tail; ///< end of meanfull data in ringbuffer
int audio_buffer_size; ///< size of ringbuffer
int audio_cnt; ///< size of meanfull data inringbuffer
int audio_drop; ///< number of dropped bytes
int audio_initialized;
#endif
radio_param_t *radio_param;
} radio_priv_t;
typedef struct radio_driver_s {
char* name;
char* info;
int (*init_frac)(radio_priv_t* priv);
void (*set_volume)(radio_priv_t* priv,int volume);
int (*get_volume)(radio_priv_t* priv,int* volume);
int (*set_frequency)(radio_priv_t* priv,float frequency);
int (*get_frequency)(radio_priv_t* priv,float* frequency);
} radio_driver_t;
#define OPT_BASE_STRUCT radio_param_t
static const m_option_t stream_opts_fields[] = {
OPT_FLOAT("title", freq_channel, 0),
OPT_STRING("capture", capture, 0),
{0}
};
static void close_s(struct stream *stream);
#if HAVE_RADIO_CAPTURE
static int clear_buffer(radio_priv_t* priv);
#endif
/*****************************************************************
* \brief parse channels parameter and store result into list
* \param freq_channel if channels!=NULL this mean channel number, otherwise - frequency
* \param pfreq selected frequency (from selected channel or from URL)
* \result STREAM_OK if success, STREAM_ERROR otherwise
*
* channels option must be in the following format
* <frequency>-<name>,<frequency>-<name>,...
*
* '_' will be replaced with spaces.
*
* If channels option is not null, number in movie URL will be treated as
* channel position in channel list.
*/
static int parse_channels(radio_priv_t* priv,float freq_channel,float* pfreq){
char** channels;
int i;
int channel = 0;
if (priv->radio_param->channels){
/*parsing channels string*/
channels=priv->radio_param->channels;
mp_tmsg(MSGT_RADIO, MSGL_INFO, "[radio] Radio channel names detected.\n");
priv->radio_channel_list = malloc(sizeof(radio_channels_t));
priv->radio_channel_list->index=1;
priv->radio_channel_list->next=NULL;
priv->radio_channel_list->prev=NULL;
priv->radio_channel_current = priv->radio_channel_list;
while (*channels) {
char* tmp = *(channels++);
char* sep = strchr(tmp,'-');
if (!sep) continue; // Wrong syntax, but mplayer should not crash
av_strlcpy(priv->radio_channel_current->name, sep + 1,sizeof(priv->radio_channel_current->name)-1);
sep[0] = '\0';
priv->radio_channel_current->freq=atof(tmp);
if ((priv->radio_channel_current->freq>priv->rangehigh)||(priv->radio_channel_current->freq<priv->rangelow))
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] Wrong frequency for channel %s\n",
priv->radio_channel_current->name);
while ((sep=strchr(priv->radio_channel_current->name, '_'))) sep[0] = ' ';
priv->radio_channel_current->next = malloc(sizeof(radio_channels_t));
priv->radio_channel_current->next->index = priv->radio_channel_current->index + 1;
priv->radio_channel_current->next->prev = priv->radio_channel_current;
priv->radio_channel_current->next->next = NULL;
priv->radio_channel_current = priv->radio_channel_current->next;
}
if (priv->radio_channel_current->prev)
priv->radio_channel_current->prev->next = NULL;
free(priv->radio_channel_current);
if (freq_channel)
channel = freq_channel;
else
channel = 1;
priv->radio_channel_current = priv->radio_channel_list;
for (i = 1; i < channel; i++)
if (priv->radio_channel_current->next)
priv->radio_channel_current = priv->radio_channel_current->next;
if (priv->radio_channel_current->index!=channel){
if (((float)((int)freq_channel))!=freq_channel)
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] Wrong channel number: %.2f\n",freq_channel);
else
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] Wrong channel number: %d\n",(int)freq_channel);
return STREAM_ERROR;
}
mp_tmsg(MSGT_RADIO, MSGL_INFO, "[radio] Selected channel: %d - %s (freq: %.2f)\n", priv->radio_channel_current->index,
priv->radio_channel_current->name, priv->radio_channel_current->freq);
*pfreq=priv->radio_channel_current->freq;
}else{
if (freq_channel){
mp_tmsg(MSGT_RADIO, MSGL_INFO, "[radio] Radio frequency parameter detected.\n");
priv->radio_channel_list=malloc(sizeof(radio_channels_t));
priv->radio_channel_list->next=NULL;
priv->radio_channel_list->prev=NULL;
priv->radio_channel_list->index=1;
snprintf(priv->radio_channel_list->name,sizeof(priv->radio_channel_current->name)-1,"Freq: %.2f",freq_channel);
priv->radio_channel_current=priv->radio_channel_list;
*pfreq=freq_channel;
}
}
mp_tmsg(MSGT_RADIO, MSGL_DBG2, "[radio] Done parsing channels.\n");
return STREAM_OK;
}
#if HAVE_RADIO_V4L2
/*****************************************************************
* \brief get fraction value for using in set_frequency and get_frequency
* \return STREAM_OK if success, STREAM_ERROR otherwise
*
* V4L2_TUNER_CAP_LOW:
* unit=62.5Hz
* frac= 1MHz/unit=1000000/62.5 =16000
*
* otherwise:
* unit=62500Hz
* frac= 1MHz/unit=1000000/62500 =16
*/
static int init_frac_v4l2(radio_priv_t* priv){
struct v4l2_tuner tuner;
memset(&tuner,0,sizeof(tuner));
tuner.index=0;
if (ioctl(priv->radio_fd, VIDIOC_G_TUNER, &tuner)<0){
mp_tmsg(MSGT_RADIO,MSGL_WARN,"[radio] Warning: ioctl get tuner failed: %s. Setting frac to %d.\n",strerror(errno),priv->frac);
return STREAM_ERROR;
}
if(tuner.type!=V4L2_TUNER_RADIO){
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] %s is no radio device!\n",priv->radio_param->device);
return STREAM_ERROR;
}
if(tuner.capability & V4L2_TUNER_CAP_LOW){
priv->frac=16000;
mp_tmsg(MSGT_RADIO,MSGL_DBG2,"[radio] tuner is low:yes frac=%d\n",priv->frac);
}
else{
priv->frac=16;
mp_tmsg(MSGT_RADIO,MSGL_DBG2,"[radio] tuner is low:no frac=%d\n",priv->frac);
}
priv->rangelow=((float)tuner.rangelow)/priv->frac;
priv->rangehigh=((float)tuner.rangehigh)/priv->frac;
mp_tmsg(MSGT_RADIO,MSGL_V,"[radio] Allowed frequency range is %.2f-%.2f MHz.\n",priv->rangelow,priv->rangehigh);
return STREAM_OK;
}
/*****************************************************************
* \brief tune card to given frequency
* \param frequency frequency in MHz
* \return STREAM_OK if success, STREAM_ERROR otherwise
*/
static int set_frequency_v4l2(radio_priv_t* priv,float frequency){
struct v4l2_frequency freq;
memset(&freq,0,sizeof(freq));
freq.tuner=0;
freq.type=V4L2_TUNER_RADIO;
freq.frequency=frequency*priv->frac;
if(ioctl(priv->radio_fd,VIDIOC_S_FREQUENCY,&freq)<0){
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] ioctl set frequency 0x%x (%.2f) failed: %s\n",freq.frequency,
frequency,strerror(errno));
return STREAM_ERROR;
}
return STREAM_OK;
}
/*****************************************************************
* \brief get current tuned frequency from card
* \param frequency where to store frequency in MHz
* \return STREAM_OK if success, STREAM_ERROR otherwise
*/
static int get_frequency_v4l2(radio_priv_t* priv,float* frequency){
struct v4l2_frequency freq;
memset(&freq,0,sizeof(freq));
if (ioctl(priv->radio_fd, VIDIOC_G_FREQUENCY, &freq) < 0) {
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] ioctl get frequency failed: %s\n",strerror(errno));
return STREAM_ERROR;
}
*frequency=((float)freq.frequency)/priv->frac;
return STREAM_OK;
}
/*****************************************************************
* \brief set volume on radio card
* \param volume volume level (0..100)
* \return STREAM_OK if success, STREAM_ERROR otherwise
*/
static void set_volume_v4l2(radio_priv_t* priv,int volume){
struct v4l2_queryctrl qctrl;
struct v4l2_control control;
/*arg must be between 0 and 100*/
if (volume > 100) volume = 100;
if (volume < 0) volume = 0;
memset(&control,0,sizeof(control));
control.id=V4L2_CID_AUDIO_MUTE;
control.value = (volume==0?1:0);
if (ioctl(priv->radio_fd, VIDIOC_S_CTRL, &control)<0){
mp_tmsg(MSGT_RADIO,MSGL_WARN,"[radio] ioctl set mute failed: %s\n",strerror(errno));
}
memset(&qctrl,0,sizeof(qctrl));
qctrl.id = V4L2_CID_AUDIO_VOLUME;
if (ioctl(priv->radio_fd, VIDIOC_QUERYCTRL, &qctrl) < 0) {
mp_tmsg(MSGT_RADIO, MSGL_WARN, "[radio] ioctl query control failed: %s\n",strerror(errno));
return;
}
memset(&control,0,sizeof(control));
control.id=V4L2_CID_AUDIO_VOLUME;
control.value=qctrl.minimum+volume*(qctrl.maximum-qctrl.minimum)/100;
if (ioctl(priv->radio_fd, VIDIOC_S_CTRL, &control) < 0) {
mp_tmsg(MSGT_RADIO, MSGL_WARN,"[radio] ioctl set volume failed: %s\n",strerror(errno));
}
}
/*****************************************************************
* \brief get current volume from radio card
* \param volume where to store volume level (0..100)
* \return STREAM_OK if success, STREAM_ERROR otherwise
*/
static int get_volume_v4l2(radio_priv_t* priv,int* volume){
struct v4l2_queryctrl qctrl;
struct v4l2_control control;
memset(&qctrl,0,sizeof(qctrl));
qctrl.id = V4L2_CID_AUDIO_VOLUME;
if (ioctl(priv->radio_fd, VIDIOC_QUERYCTRL, &qctrl) < 0) {
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] ioctl query control failed: %s\n",strerror(errno));
return STREAM_ERROR;
}
memset(&control,0,sizeof(control));
control.id=V4L2_CID_AUDIO_VOLUME;
if (ioctl(priv->radio_fd, VIDIOC_G_CTRL, &control) < 0) {
mp_tmsg(MSGT_RADIO, MSGL_ERR,"[radio] ioctl get volume failed: %s\n",strerror(errno));
return STREAM_ERROR;
}
if (qctrl.maximum==qctrl.minimum)
*volume=qctrl.minimum;
else
*volume=100*(control.value-qctrl.minimum)/(qctrl.maximum-qctrl.minimum);
/*arg must be between 0 and 100*/
if (*volume > 100) *volume = 100;
if (*volume < 0) *volume = 0;
return STREAM_OK;
}
/* v4l2 driver info structure */
static const radio_driver_t radio_driver_v4l2={
"v4l2",
_("[radio] Using V4Lv2 radio interface.\n"),
init_frac_v4l2,
set_volume_v4l2,
get_volume_v4l2,
set_frequency_v4l2,
get_frequency_v4l2
};
#endif /* HAVE_RADIO_V4L2 */
static inline int init_frac(radio_priv_t* priv){
return priv->driver->init_frac(priv);
}
static inline int set_frequency(radio_priv_t* priv,float frequency){
if ((frequency<priv->rangelow)||(frequency>priv->rangehigh)){
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] Wrong frequency: %.2f\n",frequency);
return STREAM_ERROR;
}
if(priv->driver->set_frequency(priv,frequency)!=STREAM_OK)
return STREAM_ERROR;
#if HAVE_RADIO_CAPTURE
if(clear_buffer(priv)!=STREAM_OK){
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] Clearing buffer failed: %s\n",strerror(errno));
return STREAM_ERROR;
}
#endif
return STREAM_OK;
}
static inline int get_frequency(radio_priv_t* priv,float* frequency){
return priv->driver->get_frequency(priv,frequency);
}
static inline void set_volume(radio_priv_t* priv,int volume){
priv->driver->set_volume(priv,volume);
}
static inline int get_volume(radio_priv_t* priv,int* volume){
return priv->driver->get_volume(priv,volume);
}
#if !HAVE_RADIO_CAPTURE
/*****************************************************************
* \brief stub, if capture disabled at compile-time
* \return STREAM_OK
*/
static inline int init_audio(radio_priv_t *priv){ return STREAM_OK;}
#else
/*****************************************************************
* \brief making buffer empty
* \return STREAM_OK if success, STREAM_ERROR otherwise
*
* when changing channel we must clear buffer to avoid large switching delay
*/
static int clear_buffer(radio_priv_t* priv){
if (!priv->do_capture) return STREAM_OK;
priv->audio_tail = 0;
priv->audio_head = 0;
priv->audio_cnt=0;
memset(priv->audio_ringbuffer,0,priv->audio_in.blocksize);
return STREAM_OK;
}
/*****************************************************************
* \brief read next part of data into buffer
* \return -1 if error occured or no data available yet, otherwise - bytes read
* NOTE: audio device works in non-blocking mode
*/
static int read_chunk(audio_in_t *ai, unsigned char *buffer)
{
int ret;
switch (ai->type) {
#if HAVE_ALSA
case AUDIO_IN_ALSA:
//device opened in non-blocking mode
ret = snd_pcm_readi(ai->alsa.handle, buffer, ai->alsa.chunk_size);
if (ret != ai->alsa.chunk_size) {
if (ret < 0) {
if (ret==-EAGAIN) return -1;
mp_tmsg(MSGT_RADIO, MSGL_ERR, "\nError reading audio: %s\n", snd_strerror(ret));
if (ret == -EPIPE) {
if (ai_alsa_xrun(ai) == 0) {
mp_tmsg(MSGT_RADIO, MSGL_ERR, "Recovered from cross-run, some frames may be left out!\n");
} else {
mp_tmsg(MSGT_RADIO, MSGL_ERR, "Fatal error, cannot recover!\n");
}
}
} else {
mp_tmsg(MSGT_RADIO, MSGL_ERR, "\nNot enough audio samples!\n");
}
return -1;
}
return ret;
#endif
#if HAVE_OSS_AUDIO
case AUDIO_IN_OSS:
{
int bt=0;
/*
we must return exactly blocksize bytes, so if we have got any bytes
at first call to read, we will loop untils get all blocksize bytes
otherwise we will return -1
*/
while(bt<ai->blocksize){
//device opened in non-blocking mode
ret = read(ai->oss.audio_fd, buffer+bt, ai->blocksize-bt);
if (ret==ai->blocksize) return ret;
if (ret<0){
if (errno==EAGAIN && bt==0) return -1; //no data avail yet
if (errno==EAGAIN) { usleep(1000); continue;} //nilling buffer to blocksize size
mp_tmsg(MSGT_RADIO, MSGL_ERR, "\nError reading audio: %s\n", strerror(errno));
return -1;
}
bt+=ret;
}
return bt;
}
#endif
default:
return -1;
}
}
/*****************************************************************
* \brief grab next frame from audio device
* \parameter buffer - store buffer
* \parameter len - store buffer size in bytes
* \return number of bytes written into buffer
*
* grabs len (or less) bytes from ringbuffer into buffer
* if ringbuffer is empty waits until len bytes of data will be available
*
* priv->audio_cnt - size (in bytes) of ringbuffer's filled part
* priv->audio_drop - size (in bytes) of dropped data (if no space in ringbuffer)
* priv->audio_head - index of first byte in filled part
* priv->audio_tail - index of last byte in filled part
*
* NOTE: audio_tail always aligned by priv->audio_in.blocksize
* audio_head may NOT.
*/
static int grab_audio_frame(radio_priv_t *priv, char *buffer, int len)
{
int i;
mp_tmsg(MSGT_RADIO, MSGL_DBG3, "[radio] %s: in buffer=%d dropped=%d\n","grab_audio_frame",priv->audio_cnt,priv->audio_drop);
/* Cache buffer must be filled by some audio packets when playing starts.
Otherwise MPlayer will quit with EOF error.
Probably, there is need more carefull checking rather than simple 'for' loop
(something like timer or similar).
1000ms delay will happen only at first buffer filling. At next call function
just fills buffer until either buffer full or no data from driver available.
*/
for (i=0;i<1000 && !priv->audio_cnt; i++){
//read_chunk fills exact priv->blocksize bytes
if(read_chunk(&priv->audio_in, priv->audio_ringbuffer+priv->audio_tail) < 0){
//sleppeing only when waiting first block to fill empty buffer
if (!priv->audio_cnt){
usleep(1000);
continue;
}else
break;
}
priv->audio_cnt+=priv->audio_in.blocksize;
priv->audio_tail = (priv->audio_tail+priv->audio_in.blocksize) % priv->audio_buffer_size;
}
if(priv->audio_cnt<len)
len=priv->audio_cnt;
memcpy(buffer, priv->audio_ringbuffer+priv->audio_head,len);
priv->audio_head = (priv->audio_head+len) % priv->audio_buffer_size;
priv->audio_cnt-=len;
return len;
}
/*****************************************************************
* \brief init audio device
* \return STREAM_OK if success, STREAM_ERROR otherwise
*/
static int init_audio(radio_priv_t *priv)
{
int is_oss=1;
int seconds=2;
char* tmp;
if (priv->audio_initialized) return 1;
/* do_capture==0 mplayer was not started with capture keyword, so disabling capture*/
if(!priv->do_capture)
return STREAM_OK;
if (!priv->radio_param->adevice){
priv->do_capture=0;
return STREAM_OK;
}
priv->do_capture=1;
mp_tmsg(MSGT_RADIO,MSGL_V,"[radio] Starting capture stuff.\n");
#if HAVE_ALSA
while ((tmp = strrchr(priv->radio_param->adevice, '='))){
tmp[0] = ':';
//adevice option looks like ALSA device name. Switching to ALSA
is_oss=0;
}
while ((tmp = strrchr(priv->radio_param->adevice, '.')))
tmp[0] = ',';
#endif
if(audio_in_init(&priv->audio_in, is_oss?AUDIO_IN_OSS:AUDIO_IN_ALSA)<0){
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] audio_in_init failed.\n");
}
audio_in_set_device(&priv->audio_in, priv->radio_param->adevice);
audio_in_set_channels(&priv->audio_in, priv->radio_param->achannels);
audio_in_set_samplerate(&priv->audio_in, priv->radio_param->arate);
if (audio_in_setup(&priv->audio_in) < 0) {
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] audio_in_setup call failed: %s\n", strerror(errno));
return STREAM_ERROR;
}
#if HAVE_OSS_AUDIO
if(is_oss)
ioctl(priv->audio_in.oss.audio_fd, SNDCTL_DSP_NONBLOCK, 0);
#endif
#if HAVE_ALSA
if(!is_oss)
snd_pcm_nonblock(priv->audio_in.alsa.handle,1);
#endif
priv->audio_buffer_size = seconds*priv->audio_in.samplerate*priv->audio_in.channels*
priv->audio_in.bytes_per_sample+priv->audio_in.blocksize;
if (priv->audio_buffer_size < 256*priv->audio_in.blocksize)
priv->audio_buffer_size = 256*priv->audio_in.blocksize;
mp_tmsg(MSGT_RADIO, MSGL_V, "[radio] Audio capture - buffer=%d bytes (block=%d bytes).\n",
priv->audio_buffer_size,priv->audio_in.blocksize);
/* start capture */
priv->audio_ringbuffer = calloc(1, priv->audio_buffer_size);
if (!priv->audio_ringbuffer) {
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] cannot allocate audio buffer (block=%d,buf=%d): %s\n",priv->audio_in.blocksize, priv->audio_buffer_size, strerror(errno));
return STREAM_ERROR;
}
priv->audio_head = 0;
priv->audio_tail = 0;
priv->audio_cnt = 0;
priv->audio_drop = 0;
audio_in_start_capture(&priv->audio_in);
priv->audio_initialized = 1;
return STREAM_OK;
}
#endif /* HAVE_RADIO_CAPTURE */
/*-------------------------------------------------------------------------
for call from mplayer.c
--------------------------------------------------------------------------*/
/*****************************************************************
* \brief public wrapper for get_frequency
* \parameter frequency pointer to float, which will contain frequency in MHz
* \return 1 if success,0 - otherwise
*/
int radio_get_freq(struct stream *stream, float *frequency){
radio_priv_t* priv=(radio_priv_t*)stream->priv;
if (!frequency)
return 0;
if (get_frequency(priv,frequency)!=STREAM_OK){
return 0;
}
return 1;
}
/*****************************************************************
* \brief public wrapper for set_frequency
* \parameter frequency frequency in MHz
* \return 1 if success,0 - otherwise
*/
int radio_set_freq(struct stream *stream, float frequency){
radio_priv_t* priv=(radio_priv_t*)stream->priv;
if (set_frequency(priv,frequency)!=STREAM_OK){
return 0;
}
if (get_frequency(priv,&frequency)!=STREAM_OK){
return 0;
}
mp_tmsg(MSGT_RADIO, MSGL_INFO, "[radio] Current frequency: %.2f\n",frequency);
return 1;
}
/*****************************************************************
* \brief tune current frequency by step_interval value
* \parameter step_interval increment value
* \return 1 if success,0 - otherwise
*
*/
int radio_step_freq(struct stream *stream, float step_interval){
float frequency;
radio_priv_t* priv=(radio_priv_t*)stream->priv;
if (get_frequency(priv,&frequency)!=STREAM_OK)
return 0;
frequency+=step_interval;
if (frequency>priv->rangehigh)
frequency=priv->rangehigh;
if (frequency<priv->rangelow)
frequency=priv->rangelow;
return radio_set_freq(stream,frequency);
}
/*****************************************************************
* \brief step channel up or down
* \parameter direction RADIO_CHANNEL_LOWER - go to prev channel,RADIO_CHANNEL_HIGHER - to next
* \return 1 if success,0 - otherwise
*
* if channel parameter is NULL function prints error message and does nothing, otherwise
* changes channel to prev or next in list
*/
int radio_step_channel(struct stream *stream, int direction) {
radio_priv_t* priv=(radio_priv_t*)stream->priv;
if (priv->radio_channel_list) {
switch (direction){
case RADIO_CHANNEL_HIGHER:
if (priv->radio_channel_current->next)
priv->radio_channel_current = priv->radio_channel_current->next;
else
priv->radio_channel_current = priv->radio_channel_list;
if(!radio_set_freq(stream,priv->radio_channel_current->freq))
return 0;
mp_tmsg(MSGT_RADIO, MSGL_V, "[radio] Selected channel: %d - %s (freq: %.2f)\n",
priv->radio_channel_current->index, priv->radio_channel_current->name,
priv->radio_channel_current->freq);
break;
case RADIO_CHANNEL_LOWER:
if (priv->radio_channel_current->prev)
priv->radio_channel_current = priv->radio_channel_current->prev;
else
while (priv->radio_channel_current->next)
priv->radio_channel_current = priv->radio_channel_current->next;
if(!radio_set_freq(stream,priv->radio_channel_current->freq))
return 0;
mp_tmsg(MSGT_RADIO, MSGL_V, "[radio] Selected channel: %d - %s (freq: %.2f)\n",
priv->radio_channel_current->index, priv->radio_channel_current->name,
priv->radio_channel_current->freq);
break;
}
}else
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] Can not change channel: no channel list given.\n");
return 1;
}
/*****************************************************************
* \brief change channel to one with given index
* \parameter channel string, containing channel number
* \return 1 if success,0 - otherwise
*
* if channel parameter is NULL function prints error message and does nothing, otherwise
* changes channel to given
*/
int radio_set_channel(struct stream *stream, char *channel) {
radio_priv_t* priv=(radio_priv_t*)stream->priv;
int i, channel_int;
radio_channels_t* tmp;
char* endptr;
if (*channel=='\0')
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] Wrong channel name: %s\n",channel);
if (priv->radio_channel_list) {
channel_int = strtol(channel,&endptr,10);
tmp = priv->radio_channel_list;
if (*endptr!='\0'){
//channel is not a number, so it contains channel name
for ( ; tmp; tmp=tmp->next)
if (!strncmp(channel,tmp->name,sizeof(tmp->name)-1))
break;
if (!tmp){
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] Wrong channel name: %s\n",channel);
return 0;
}
}else{
for (i = 1; i < channel_int; i++)
if (tmp->next)
tmp = tmp->next;
else
break;
if (tmp->index!=channel_int){
mp_tmsg(MSGT_RADIO,MSGL_ERR,"[radio] Wrong channel number: %d\n",channel_int);
return 0;
}
}
priv->radio_channel_current=tmp;
mp_tmsg(MSGT_RADIO, MSGL_V, "[radio] Selected channel: %d - %s (freq: %.2f)\n", priv->radio_channel_current->index,
priv->radio_channel_current->name, priv->radio_channel_current->freq);
if(!radio_set_freq(stream, priv->radio_channel_current->freq))
return 0;
} else
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] Can not change channel: no channel list given.\n");
return 1;
}
/*****************************************************************
* \brief get current channel's name
* \return pointer to string, containing current channel's name
*
* NOTE: return value may be NULL (e.g. when channel list not initialized)
*/
char* radio_get_channel_name(struct stream *stream){
radio_priv_t* priv=(radio_priv_t*)stream->priv;
if (priv->radio_channel_current) {
return priv->radio_channel_current->name;
}
return NULL;
}
/*****************************************************************
* \brief fills given buffer with audio data
* \return number of bytes, written into buffer
*/
static int fill_buffer_s(struct stream *s, char *buffer, int max_len){
int len=max_len;
#if HAVE_RADIO_CAPTURE
radio_priv_t* priv=(radio_priv_t*)s->priv;
if (priv->do_capture){
len=grab_audio_frame(priv, buffer,max_len);
}
else
#endif
memset(buffer,0,len);
return len;
}
/*
order if significant!
when no driver explicitly specified first available will be used
*/
static const radio_driver_t* radio_drivers[]={
#if HAVE_RADIO_V4L2
&radio_driver_v4l2,
#endif
0
};
/*****************************************************************
* Stream initialization
* \return STREAM_OK if success, STREAM_ERROR otherwise
*/
static int open_s(stream_t *stream,int mode)
{
radio_priv_t* priv;
float frequency=0;
int i;
if (strncmp("radio://",stream->url,8) != 0)
return STREAM_UNSUPPORTED;
if(mode != STREAM_READ)
return STREAM_UNSUPPORTED;
priv=calloc(1,sizeof(radio_priv_t));
if (!priv)
return STREAM_ERROR;
priv->radio_param=stream->priv;
stream->priv=NULL;
#if HAVE_RADIO_CAPTURE
if (priv->radio_param->capture && strncmp("capture",priv->radio_param->capture,7)==0)
priv->do_capture=1;
else
priv->do_capture=0;
#endif
if (strncmp(priv->radio_param->driver,"default",7)==0)
priv->driver=radio_drivers[0];
else
priv->driver=NULL;
mp_tmsg(MSGT_RADIO,MSGL_V,"[radio] Available drivers: ");
for(i=0;radio_drivers[i];i++){
mp_msg(MSGT_RADIO,MSGL_V,"%s, ",radio_drivers[i]->name);
if(strcmp(priv->radio_param->driver,radio_drivers[i]->name)==0)
priv->driver=radio_drivers[i];
}
mp_msg(MSGT_RADIO,MSGL_V,"\n");
if(priv->driver)
mp_msg(MSGT_RADIO, MSGL_INFO, priv->driver->info);
else{
mp_tmsg(MSGT_RADIO, MSGL_INFO, "[radio] Unknown driver name: %s\n",priv->radio_param->driver);
close_s(stream);
return STREAM_ERROR;
}
stream->type = STREAMTYPE_RADIO;
/* using rawaudio demuxer */
stream->demuxer = "lavf";
stream->flags = STREAM_READ;
priv->radio_fd=-1;
stream->start_pos=0;
stream->end_pos=0;
stream->priv=priv;
stream->close=close_s;
stream->fill_buffer=fill_buffer_s;
priv->radio_fd = open(priv->radio_param->device, O_RDONLY);
if (priv->radio_fd < 0) {
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] Unable to open '%s': %s\n",
priv->radio_param->device, strerror(errno));
close_s(stream);
return STREAM_ERROR;
}
mp_tmsg(MSGT_RADIO, MSGL_V, "[radio] Radio fd: %d, %s\n", priv->radio_fd,priv->radio_param->device);
fcntl(priv->radio_fd, F_SETFD, FD_CLOEXEC);
get_volume(priv, &priv->old_snd_volume);
set_volume(priv,0);
if (init_frac(priv)!=STREAM_OK){
close_s(stream);
return STREAM_ERROR;
};
if (parse_channels(priv,priv->radio_param->freq_channel,&frequency)!=STREAM_OK){
close_s(stream);
return STREAM_ERROR;
}
if ((frequency<priv->rangelow)||(frequency>priv->rangehigh)){
mp_tmsg(MSGT_RADIO, MSGL_ERR, "[radio] Wrong frequency: %.2f\n",frequency);
close_s(stream);
return STREAM_ERROR;
}else
mp_tmsg(MSGT_RADIO, MSGL_INFO, "[radio] Using frequency: %.2f.\n",frequency);
if(set_frequency(priv,frequency)!=STREAM_OK){
close_s(stream);
return STREAM_ERROR;
}
if (init_audio(priv)!=STREAM_OK){
close_s(stream);
return STREAM_ERROR;
}
set_volume(priv,priv->radio_param->volume);
return STREAM_OK;
}
/*****************************************************************
* Close stream. Clear structures.
*/
static void close_s(struct stream *stream){
radio_priv_t* priv=(radio_priv_t*)stream->priv;
radio_channels_t * tmp;
if (!priv) return;
#if HAVE_RADIO_CAPTURE
free(priv->audio_ringbuffer);
priv->audio_ringbuffer = NULL;
priv->do_capture=0;
#endif
while (priv->radio_channel_list) {
tmp=priv->radio_channel_list;
priv->radio_channel_list=priv->radio_channel_list->next;
free(tmp);
}
priv->radio_channel_current=NULL;
priv->radio_channel_list=NULL;
if (priv->radio_fd>0){
set_volume(priv, priv->old_snd_volume);
close(priv->radio_fd);
}
free(priv);
stream->priv=NULL;
}
const stream_info_t stream_info_radio = {
.name = "radio",
.open = open_s,
.protocols = (const char*[]){ "radio", NULL },
.priv_size = sizeof(radio_param_t),
.priv_defaults = &stream_radio_defaults,
.options = stream_opts_fields,
.url_options = (const char*[]){
"hostname=freqchannel",
"filename=capture",
NULL
},
};
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