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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <samplerate.h>
#include "threading.h"
#include "codec.h"
#include "playlist.h"
#include "common.h"
#include "streamer.h"
extern int sdl_player_freq; // hack!
static SRC_STATE *src;
static SRC_DATA srcdata;
static int codecleft;
static char g_readbuffer[200000]; // hack!
static float g_fbuffer[200000]; // hack!
static float g_srcbuffer[200000]; // hack!
static int streaming_terminate;
#define STREAM_BUFFER_SIZE 200000
static int streambuffer_fill;
static char streambuffer[STREAM_BUFFER_SIZE+1000];
static uintptr_t mutex;
static int
streamer_read_async (char *bytes, int size);
void
streamer_thread (uintptr_t ctx) {
codecleft = 0;
while (!streaming_terminate) {
streamer_lock ();
if (streambuffer_fill < STREAM_BUFFER_SIZE) {
int sz = STREAM_BUFFER_SIZE - streambuffer_fill;
int minsize = 512;
if (streambuffer_fill < 16384) {
minsize = 16384;
}
sz = min (minsize, sz);
// printf ("reading %d\n", sz);
int bytesread = streamer_read_async (&streambuffer[streambuffer_fill], sz);
streambuffer_fill += bytesread;
}
streamer_unlock ();
usleep (3000);
//printf ("fill: %d \r", streambuffer_fill);
}
if (src) {
src_delete (src);
src = NULL;
}
}
int
streamer_init (void) {
mutex = mutex_create ();
// src = src_new (SRC_SINC_BEST_QUALITY, 2, NULL);
src = src_new (SRC_LINEAR, 2, NULL);
if (!src) {
return -1;
}
thread_start (streamer_thread, 0);
return 0;
}
void
streamer_free (void) {
streaming_terminate = 1;
mutex_free (mutex);
}
void
streamer_reset (void) { // must be called when current song changes by external reasons
codecleft = 0;
src_reset (src);
}
// returns number of bytes been read
static int
streamer_read_async (char *bytes, int size) {
int initsize = size;
for (;;) {
int bytesread = 0;
codec_lock ();
codec_t *codec = playlist_current.codec;
if (!codec) {
codec_unlock ();
break;
}
if (codec->info.samplesPerSecond != -1) {
int nchannels = codec->info.channels;
int samplerate = codec->info.samplesPerSecond;
// read and do SRC
if (codec->info.samplesPerSecond == sdl_player_freq) {
int i;
if (codec->info.channels == 2) {
bytesread = codec->read (bytes, size);
codec_unlock ();
}
else {
bytesread = codec->read (g_readbuffer, size/2);
codec_unlock ();
for (i = 0; i < size/4; i++) {
int16_t sample = (int16_t)(((int32_t)(((int16_t*)g_readbuffer)[i])));
((int16_t*)bytes)[i*2+0] = sample;
((int16_t*)bytes)[i*2+1] = sample;
}
bytesread *= 2;
}
}
else {
int nsamples = size/4;
// convert to codec samplerate
nsamples = nsamples * samplerate / sdl_player_freq * 2;
if (!src_is_valid_ratio ((double)sdl_player_freq/samplerate)) {
printf ("invalid ratio! %d / %d = %f", sdl_player_freq, samplerate, (float)sdl_player_freq/samplerate);
}
assert (src_is_valid_ratio ((double)sdl_player_freq/samplerate));
// read data at source samplerate (with some room for SRC)
int nbytes = (nsamples - codecleft) * 2 * nchannels;
if (nbytes < 0) {
nbytes = 0;
}
else {
//printf ("reading %d bytes from mp3\n", nbytes);
bytesread = codec->read (g_readbuffer, nbytes);
}
codec_unlock ();
// recalculate nsamples according to how many bytes we've got
nsamples = bytesread / (2 * nchannels) + codecleft;
// convert to float
int i;
float *fbuffer = g_fbuffer + codecleft*2;
if (nchannels == 2) {
for (i = 0; i < (nsamples - codecleft) * 2; i++) {
fbuffer[i] = ((int16_t *)g_readbuffer)[i]/32767.f;
}
}
else if (nchannels == 1) { // convert mono to stereo
for (i = 0; i < (nsamples - codecleft); i++) {
fbuffer[i*2+0] = ((int16_t *)g_readbuffer)[i]/32767.f;
fbuffer[i*2+1] = fbuffer[i*2+0];
}
}
codec_lock ();
// convert samplerate
srcdata.data_in = g_fbuffer;
srcdata.data_out = g_srcbuffer;
srcdata.input_frames = nsamples;
srcdata.output_frames = size/4;
srcdata.src_ratio = (double)sdl_player_freq/samplerate;
srcdata.end_of_input = 0;
// src_set_ratio (src, srcdata.src_ratio);
src_process (src, &srcdata);
codec_unlock ();
// convert back to s16 format
nbytes = size;
int genbytes = srcdata.output_frames_gen * 4;
bytesread = min(size, genbytes);
for (i = 0; i < bytesread/2; i++) {
float sample = g_srcbuffer[i];
if (sample > 1) {
sample = 1;
}
if (sample < -1) {
sample = -1;
}
((int16_t*)bytes)[i] = (int16_t)(sample*32767.f);
}
// calculate how many unused input samples left
codecleft = nsamples - srcdata.input_frames_used;
// copy spare samples for next update
memmove (g_fbuffer, &g_fbuffer[srcdata.input_frames_used*2], codecleft * 8);
}
}
else {
codec_unlock ();
}
bytes += bytesread;
size -= bytesread;
if (size == 0) {
return initsize;
}
else {
// that means EOF
while (ps_nextsong () < 0) {
fprintf (stderr, "bad song encountered in playlist, skipping\n");
usleep (3000);
}
}
}
return initsize - size;
}
void
streamer_lock (void) {
mutex_lock (mutex);
}
void
streamer_unlock (void) {
mutex_unlock (mutex);
}
int
streamer_read (char *bytes, int size) {
streamer_lock ();
int sz = min (size, streambuffer_fill);
if (sz) {
memcpy (bytes, streambuffer, sz);
if (sz < streambuffer_fill) {
// shift buffer
memmove (streambuffer, &streambuffer[sz], streambuffer_fill-sz);
}
streambuffer_fill -= sz;
}
streamer_unlock ();
return sz;
}
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