Patch for AAC encoding with libfaac by (Gildas Bazin <gbazin at altern dot org>)

Originally committed as revision 2342 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 126 insertions, 0 deletions

diff --git a/libavcodec/faac.c b/libavcodec/faac.c
new file mode 100644
index 0000000000..9720166e42
--- /dev/null
+++ b/libavcodec/faac.c
@@ -0,0 +1,126 @@
+/*
+ * Interface to libfaac for aac encoding
+ * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
+ *
+ * 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 faacaudio.c
+ * Interface to libfaac for aac encoding.
+ */
+
+#include "avcodec.h"
+#include <faac.h>
+
+typedef struct FaacAudioContext {
+    faacEncHandle faac_handle;
+} FaacAudioContext;
+
+static int Faac_encode_init(AVCodecContext *avctx)
+{
+    FaacAudioContext *s = avctx->priv_data;
+    faacEncConfigurationPtr faac_cfg;
+    unsigned long samples_input, max_bytes_output;
+
+    /* number of channels */
+    if (avctx->channels < 1 || avctx->channels > 6)
+        return -1;
+
+    s->faac_handle = faacEncOpen(avctx->sample_rate,
+                                 avctx->channels,
+                                 &samples_input, &max_bytes_output);
+
+    /* check faac version */
+    faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
+    if (faac_cfg->version != FAAC_CFG_VERSION) {
+        fprintf(stderr, "wrong libfaac version (compiled for: %d, using %d)\n",
+                FAAC_CFG_VERSION, faac_cfg->version );
+        faacEncClose(s->faac_handle);
+        return -1;
+    }
+
+    /* put the options in the configuration struct */
+    faac_cfg->aacObjectType = LOW;
+    faac_cfg->mpegVersion = MPEG4;
+    faac_cfg->useTns = 0;
+    faac_cfg->allowMidside = 1;
+    faac_cfg->bitRate = avctx->bit_rate;
+    faac_cfg->outputFormat = 0;
+    faac_cfg->inputFormat = FAAC_INPUT_16BIT;
+
+    if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
+        fprintf(stderr, "libfaac doesn't support this output format!\n");
+        return -1;
+    }
+
+    avctx->frame_size = samples_input / avctx->channels;
+
+    avctx->coded_frame= avcodec_alloc_frame();
+    avctx->coded_frame->key_frame= 1;
+
+    /* Set decoder specific info */
+    avctx->extradata_size = 0;
+    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
+
+        unsigned char *buffer;
+        unsigned long decoder_specific_info_size;
+
+        if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
+                                           &decoder_specific_info_size)) {
+            avctx->extradata = buffer;
+            avctx->extradata_size = decoder_specific_info_size;
+        }
+    }
+
+    return 0;
+}
+
+int Faac_encode_frame(AVCodecContext *avctx,
+                      unsigned char *frame, int buf_size, void *data)
+{
+    FaacAudioContext *s = avctx->priv_data;
+    int bytes_written;
+
+    bytes_written = faacEncEncode(s->faac_handle,
+                                  data,
+                                  avctx->frame_size * avctx->channels,
+                                  frame,
+                                  buf_size);
+
+    return bytes_written;
+}
+
+int Faac_encode_close(AVCodecContext *avctx)
+{
+    FaacAudioContext *s = avctx->priv_data;
+
+    av_freep(&avctx->coded_frame);
+
+    //if (avctx->extradata_size) free(avctx->extradata);
+
+    faacEncClose(s->faac_handle);
+    return 0;
+}
+
+AVCodec faac_encoder = {
+    "aac",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_AAC,
+    sizeof(FaacAudioContext),
+    Faac_encode_init,
+    Faac_encode_frame,
+    Faac_encode_close
+};