add sound file streaming

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@171 fefdeb5f-60dc-0310-8127-8f9354f1896f

polyp/sound-file-stream.c

@@ -0,0 +1,162 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio 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.
+ 
+  polypaudio 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 polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <sndfile.h>
+
+#include "sound-file-stream.h"
+#include "sink-input.h"
+#include "xmalloc.h"
+
+#define BUF_SIZE (1024*10)
+
+struct userdata {
+    SNDFILE *sndfile;
+    struct pa_sink_input *sink_input;
+    struct pa_memchunk memchunk;
+};
+
+static void free_userdata(struct userdata *u) {
+    assert(u);
+    if (u->sink_input)
+        pa_sink_input_free(u->sink_input);
+    if (u->memchunk.memblock)
+        pa_memblock_unref(u->memchunk.memblock);
+    if (u->sndfile)
+        sf_close(u->sndfile);
+
+    pa_xfree(u);
+}
+
+static void sink_input_kill(struct pa_sink_input *i) {
+    assert(i && i->userdata);
+    free_userdata(i->userdata);
+}
+
+static void si_kill(struct pa_mainloop_api *m, void *i) {
+    sink_input_kill(i);
+}
+
+static int sink_input_peek(struct pa_sink_input *i, struct pa_memchunk *chunk) {
+    struct userdata *u;
+    assert(i && chunk && i->userdata);
+    u = i->userdata;
+
+    if (!u->memchunk.memblock) {
+        uint32_t fs = pa_frame_size(&i->sample_spec);
+        sf_count_t samples = BUF_SIZE/fs;
+
+        u->memchunk.memblock = pa_memblock_new(BUF_SIZE, i->sink->core->memblock_stat);
+        u->memchunk.index = 0;
+        samples = sf_readf_float(u->sndfile, u->memchunk.memblock->data, samples);
+        u->memchunk.length = samples*fs;
+        
+        if (!u->memchunk.length) {
+            pa_memblock_unref(u->memchunk.memblock);
+            u->memchunk.memblock = NULL;
+            u->memchunk.index = u->memchunk.length = 0;
+            pa_mainloop_api_once(i->sink->core->mainloop, si_kill, i);
+            return -1;
+        }
+    }
+
+    *chunk = u->memchunk;
+    pa_memblock_ref(chunk->memblock);
+    assert(chunk->length);
+    return 0;
+}
+
+static void sink_input_drop(struct pa_sink_input *i, const struct pa_memchunk*chunk, size_t length) {
+    struct userdata *u;
+    assert(i && chunk && length && i->userdata);
+    u = i->userdata;
+
+    assert(!memcmp(chunk, &u->memchunk, sizeof(chunk)));
+    assert(length <= u->memchunk.length);
+
+    u->memchunk.index += length;
+    u->memchunk.length -= length;
+
+    if (u->memchunk.length <= 0) {
+        pa_memblock_unref(u->memchunk.memblock);
+        u->memchunk.memblock = NULL;
+        u->memchunk.index = u->memchunk.length = 0;
+    }
+}
+
+int pa_play_file(struct pa_sink *sink, const char *fname, pa_volume_t volume) {
+    struct userdata *u = NULL;
+    SF_INFO sfinfo;
+    struct pa_sample_spec ss;
+    assert(sink && fname);
+
+    if (volume <= 0)
+        goto fail;
+
+    u = pa_xmalloc(sizeof(struct userdata));
+    u->sink_input = NULL;
+    u->memchunk.memblock = NULL;
+    u->memchunk.index = u->memchunk.length = 0;
+    u->sndfile = NULL;
+
+    memset(&sfinfo, 0, sizeof(sfinfo));
+
+    if (!(u->sndfile = sf_open(fname, SFM_READ, &sfinfo))) {
+        fprintf(stderr, __FILE__": Failed to open file %s\n", fname);
+        goto fail;
+    }
+
+    ss.format = PA_SAMPLE_FLOAT32;
+    ss.rate = sfinfo.samplerate;
+    ss.channels = sfinfo.channels;
+
+    if (!pa_sample_spec_valid(&ss)) {
+        fprintf(stderr, __FILE__": Unsupported sample format in file %s\n", fname);
+        goto fail;
+    }
+    
+    if (!(u->sink_input = pa_sink_input_new(sink, fname, &ss)))
+        goto fail;
+
+    u->sink_input->volume = volume;
+    u->sink_input->peek = sink_input_peek;
+    u->sink_input->drop = sink_input_drop;
+    u->sink_input->kill = sink_input_kill;
+    u->sink_input->userdata = u;
+    
+    pa_sink_notify(sink);
+
+    return 0;
+
+fail:
+    if (u)
+        free_userdata(u);
+    
+    return -1;
+}