From aab7e4819c5b06e01ebf109803e4efbe244c632a Mon Sep 17 00:00:00 2001
From: Neale Pickett <neale@woozle.org>
Date: Mon, 6 Aug 2012 23:24:06 -0600
Subject: [PATCH] Add an AAC player, since this is now my little playground

---
 aac123.c | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 aac123.c

diff --git a/aac123.c b/aac123.c
new file mode 100644
index 0000000..03e6a10
--- /dev/null
+++ b/aac123.c
@@ -0,0 +1,165 @@
+#include <stdio.h>
+#include <malloc.h>
+
+#include <alsa/asoundlib.h>
+#include <neaacdec.h>
+#include <mp4ff.h>
+
+/* Some things I use for debugging */
+#ifdef NODUMP
+#  define DUMPf(fmt, args...)
+#else
+#  define DUMPf(fmt, args...) fprintf(stderr, "%s:%s:%d " fmt "\n", __FILE__, __FUNCTION__, __LINE__, ##args)
+#endif
+#define DUMP() DUMPf("")
+#define DUMP_d(v) DUMPf("%s = %d", #v, v)
+#define DUMP_x(v) DUMPf("%s = 0x%x", #v, v)
+#define DUMP_s(v) DUMPf("%s = %s", #v, v)
+#define DUMP_c(v) DUMPf("%s = '%c' (0x%02x)", #v, v, v)
+#define DUMP_p(v) DUMPf("%s = %p", #v, v)
+
+
+uint32_t
+read_callback(void *user_data, void *buffer, uint32_t length)
+{
+    return fread(buffer, 1, length, (FILE*)user_data);
+}
+        
+uint32_t
+seek_callback(void *user_data, uint64_t position)
+{
+    return fseek((FILE*)user_data, position, SEEK_SET);
+}
+
+static int
+GetAACTrack(mp4ff_t *infile)
+{
+    /* find AAC track */
+    int i, rc;
+    int numTracks = mp4ff_total_tracks(infile);
+
+    for (i = 0; i < numTracks; i++)
+    {
+        unsigned char *buff = NULL;
+        int buff_size = 0;
+        mp4AudioSpecificConfig mp4ASC;
+
+        mp4ff_get_decoder_config(infile, i, &buff, &buff_size);
+
+        if (buff)
+        {
+            rc = NeAACDecAudioSpecificConfig(buff, buff_size, &mp4ASC);
+            free(buff);
+
+            if (rc < 0)
+                continue;
+            return i;
+        }
+    }
+
+    /* can't decode this */
+    return -1;
+}
+
+
+int
+main(int argc, char *argv[])
+{
+    snd_pcm_t *snd;
+
+    int track;
+
+    mp4ff_t *infile;
+    mp4ff_callback_t mp4cb;
+
+    NeAACDecHandle hDecoder;
+    NeAACDecConfigurationPtr config;
+    mp4AudioSpecificConfig mp4ASC;
+
+    unsigned char *buffer;
+    int buffer_size;
+    unsigned long samplerate;
+    unsigned char channels;
+
+    long sampleId, numSamples;
+    void *sample_buffer;
+
+    if (snd_pcm_open(&snd, "default", SND_PCM_STREAM_PLAYBACK, 0) < 0) {
+        fprintf(stderr, "Opening ALSA\n");
+        return 1;
+    }
+    
+
+
+    mp4cb.read = read_callback;
+    mp4cb.seek = seek_callback;
+    mp4cb.user_data = stdin;
+
+    infile = mp4ff_open_read(&mp4cb);
+    if (! infile) {
+        fprintf(stderr, "Opening stdin fail\n");
+        return 1;
+    }
+
+    if ((track = GetAACTrack(infile)) < 0) {
+        fprintf(stderr, "GetAACTrack\n");
+        return 1;
+    }
+
+    hDecoder = NeAACDecOpen();
+    config = NeAACDecGetCurrentConfiguration(hDecoder);
+    config->outputFormat = FAAD_FMT_16BIT;
+    NeAACDecSetConfiguration(hDecoder, config);
+
+    buffer = NULL;
+    buffer_size = 0;
+    mp4ff_get_decoder_config(infile, track, &buffer, &buffer_size);
+
+    if (NeAACDecInit2(hDecoder, buffer, buffer_size, &samplerate, &channels) < 0) {
+        fprintf(stderr, "Initializing decoder\n");
+        return 1;
+    }
+    if (snd_pcm_set_params(snd,
+                           SND_PCM_FORMAT_S16,
+                           SND_PCM_ACCESS_RW_INTERLEAVED,
+                           channels,
+                           samplerate,
+                           1,
+                           500000) < 0) {
+        fprintf(stderr, "Set ALSA params\n");
+        return 1;
+    }
+    DUMP_d(channels);
+    DUMP_d(samplerate);
+
+    if (buffer) {
+        free(buffer);
+    }
+
+    numSamples = mp4ff_num_samples(infile, track);
+
+    for (sampleId = 0; sampleId < numSamples; sampleId++) {
+        int rc;
+        long dur;
+        unsigned int sample_count;
+        unsigned int delay = 0;
+        NeAACDecFrameInfo frameInfo;
+
+        buffer = NULL;
+        buffer_size = 0;
+
+        dur = mp4ff_get_sample_duration(infile, track, sampleId);
+        rc = mp4ff_read_sample(infile, track, sampleId, &buffer, &buffer_size);
+        if (rc == 0) {
+            fprintf(stderr, "Read failed\n");
+            return 1;
+        }
+
+        sample_buffer = NeAACDecDecode(hDecoder, &frameInfo, buffer, buffer_size);
+        sample_count = frameInfo.samples;
+
+        snd_pcm_writei(snd, sample_buffer, sample_count / channels);
+    }
+
+    return 0;
+}