* support for AAC audio streams via libfaad

* could be complied with runtime linking of libfaad (CONFIG_FAADBIN)
* missing/untested support for raw AAC streams (maybe there will be
  just one entry for aac)
* missing configure check for libfaad/config option

Originally committed as revision 1857 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 247 insertions, 0 deletions

diff --git a/libavcodec/faad.c b/libavcodec/faad.c
new file mode 100644
index 0000000000..6dfffd837d
--- /dev/null
+++ b/libavcodec/faad.c
@@ -0,0 +1,247 @@
+/*
+ * Faad decoder
+ * Copyright (c) 2003 Zdenek Kabelac.
+ *
+ * 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
+ */
+
+/**
+ * @file faad.c
+ * AAC decoder.
+ *
+ * still a bit unfinished - but it plays something
+ */
+
+#include "avcodec.h"
+#include "faad.h"
+
+/*
+ * when CONFIG_FAADBIN is defined the libfaad will be opened at runtime
+ */
+//#undef CONFIG_FAADBIN
+//#define CONFIG_FAADBIN
+
+#ifdef CONFIG_FAADBIN
+#include <dlfcn.h>
+static const char* libfaadname = "libfaad.so.0";
+#else
+#define dlopen(a)
+#define dlclose(a)
+#endif
+
+typedef struct {
+    void* handle;		/* dlopen handle */
+    void* faac_handle;		/* FAAD library handle */
+    int frame_size;
+    int sample_size;
+    int flags;
+
+    /* faad calls */
+    faacDecHandle FAADAPI (*faacDecOpen)(void);
+    faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
+    unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
+                                                     faacDecConfigurationPtr config);
+    long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
+				unsigned char *buffer,
+				unsigned long *samplerate,
+				unsigned char *channels);
+    char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
+                                 unsigned long SizeOfDecoderSpecificInfo,
+                                 unsigned long *samplerate, unsigned char *channels);
+    void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
+    void* FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
+                                   faacDecFrameInfo *hInfo,
+                                   unsigned char *buffer);
+    unsigned char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
+} FAACContext;
+
+static const unsigned long faac_srates[] =
+{
+    96000, 88200, 64000, 48000, 44100, 32000,
+    24000, 22050, 16000, 12000, 11025, 8000
+};
+
+static int faac_init_mp4(AVCodecContext *avctx)
+{
+    FAACContext *s = (FAACContext *) avctx->priv_data;
+    unsigned long samplerate;
+    unsigned char channels;
+    int r = 0;
+
+    if (avctx->extradata)
+	r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
+			    avctx->extradata_size,
+			    &samplerate, &channels);
+    // else r = s->faacDecInit(s->faac_handle ... );
+
+    if (r < 0)
+	fprintf(stderr, "faacDecInit2 failed r:%d   sr:%ld  ch:%d  s:%d\n",
+		r, samplerate, channels, avctx->extradata_size);
+
+    return r;
+}
+
+static int faac_init_aac(AVCodecContext *avctx)
+{
+    FAACContext *s = (FAACContext *) avctx->priv_data;
+    return 0;
+}
+
+static int faac_decode_frame(AVCodecContext *avctx,
+                             void *data, int *data_size,
+                             uint8_t *buf, int buf_size)
+{
+    FAACContext *s = (FAACContext *) avctx->priv_data;
+    faacDecFrameInfo frame_info;
+    void* out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf);
+    //printf("DECODE FRAME %d, %d, %d - %p\n", buf_size, frame_info.samples, frame_info.bytesconsumed, out);
+
+    if (frame_info.error > 0) {
+	fprintf(stderr, "faac: frame decodinf failed: %s\n",
+		s->faacDecGetErrorMessage(frame_info.error));
+        return 0;
+    }
+
+    frame_info.samples *= s->sample_size;
+    memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
+
+    if (data_size)
+	*data_size = frame_info.samples;
+
+    return (buf_size < (int)frame_info.bytesconsumed)
+	? buf_size : (int)frame_info.bytesconsumed;
+}
+
+static int faac_decode_end(AVCodecContext *avctx)
+{
+    FAACContext *s = (FAACContext *) avctx->priv_data;
+
+    if (s->faacDecClose)
+        s->faacDecClose(s->faac_handle);
+
+    dlclose(s->handle);
+    return 0;
+}
+
+static int faac_decode_init(AVCodecContext *avctx)
+{
+    FAACContext *s = (FAACContext *) avctx->priv_data;
+    faacDecConfigurationPtr faac_cfg;
+
+#ifdef CONFIG_FAADBIN
+    const char* err = 0;
+
+    s->handle = dlopen(libfaadname, RTLD_LAZY);
+    if (!s->handle)
+    {
+	fprintf(stderr, "FAAD library: %s could not be opened! \n%s\n",
+		libfaadname, dlerror());
+        return -1;
+    }
+#define dfaac(a, b) \
+    do { static const char* n = "faacDec" #a; \
+    if ((s->faacDec ## a = b dlsym( s->handle, n )) == NULL) { err = n; break; } } while(0)
+    for(;;) {
+#else  /* !CONFIG_FAADBIN */
+#define dfaac(a, b)     s->faacDec ## a = faacDec ## a
+#endif /* CONFIG_FAADBIN */
+
+        // resolve all needed function calls
+        dfaac(Open, (faacDecHandle FAADAPI (*)(void)));
+	dfaac(GetCurrentConfiguration, (faacDecConfigurationPtr
+					FAADAPI (*)(faacDecHandle)));
+	dfaac(SetConfiguration, (unsigned char FAADAPI (*)(faacDecHandle,
+							   faacDecConfigurationPtr)));
+
+	dfaac(Init, (long FAADAPI (*)(faacDecHandle, unsigned char*,
+				     unsigned long*, unsigned char*)));
+        dfaac(Init2, (char FAADAPI (*)(faacDecHandle, unsigned char*,
+				       unsigned long, unsigned long*,
+				       unsigned char*)));
+        dfaac(Close, (void FAADAPI (*)(faacDecHandle hDecoder)));
+	dfaac(Decode, (void* FAADAPI (*)(faacDecHandle, faacDecFrameInfo*,
+					 unsigned char*)));
+
+	dfaac(GetErrorMessage, (unsigned char* FAADAPI (*)(unsigned char)));
+#undef dfacc
+
+#ifdef CONFIG_FAADBIN
+        break;
+    }
+    if (err) {
+        dlclose(s->handle);
+	fprintf(stderr, "FAAD library: cannot resolve %s in %s!\n",
+		err, libfaadname);
+        return -1;
+    }
+#endif
+
+    s->faac_handle = s->faacDecOpen();
+    if (!s->faac_handle) {
+        fprintf(stderr, "FAAD library: cannot create handler!\n");
+        faac_decode_end(avctx);
+        return -1;
+    }
+
+
+    faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
+
+    if (faac_cfg) {
+	switch (avctx->bits_per_sample) {
+	case 8: fprintf(stderr, "FAADlib unsupported bps %d\n", avctx->bits_per_sample); break;
+	default:
+	case 16:
+	    faac_cfg->outputFormat = FAAD_FMT_16BIT;
+	    s->sample_size = 2;
+	    break;
+	case 24:
+	    faac_cfg->outputFormat = FAAD_FMT_24BIT;
+	    s->sample_size = 3;
+	    break;
+	case 32:
+	    faac_cfg->outputFormat = FAAD_FMT_32BIT;
+	    s->sample_size = 4;
+	    break;
+	}
+
+	faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
+	faac_cfg->defObjectType = LC;
+    }
+
+    s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
+
+    faac_init_mp4(avctx);
+
+    return 0;
+}
+
+#define AAC_CODEC(id, name)     \
+AVCodec name ## _decoder = {    \
+    #name,                      \
+    CODEC_TYPE_AUDIO,           \
+    id,                         \
+    sizeof(FAACContext),        \
+    faac_decode_init,           \
+    NULL,                       \
+    faac_decode_end,            \
+    faac_decode_frame,          \
+}
+
+// FIXME - raw AAC files - maybe just one entry will be enough
+AAC_CODEC(CODEC_ID_AAC, aac);
+// If it's mp4 file - usually embeded into Qt Mov
+AAC_CODEC(CODEC_ID_MPEG4AAC, mpeg4aac);
+
+#undef AAC_CODEC