skeleton for vorbis_enc.c

Originally committed as revision 6413 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vorbis_enc.c

+/*
+ * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * @file vorbis_enc.c
+ * Native Vorbis encoder.
+ * @author Oded Shimon <ods15@ods15.dyndns.org>
+ */
+
+#include "avcodec.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+#define VORBIS_FRAME_SIZE 64
+
+#define BUFFER_SIZE (1024*64)
+
+typedef struct {
+    uint8_t buffer[BUFFER_SIZE];
+    int buffer_index;
+} venc_context_t;
+
+static int vorbis_encode_init(AVCodecContext * avccontext) {
+    venc_context_t * venc = avccontext->priv_data;
+    uint8_t *p;
+    unsigned int offset, len;
+
+    avccontext->channels;
+    avccontext->sample_rate;
+    //if (avccontext->flags & CODEC_FLAG_QSCALE) avccontext->global_quality / (float)FF_QP2LAMBDA); else avccontext->bit_rate;
+    //if(avccontext->cutoff > 0) cfreq = avccontext->cutoff / 1000.0;
+
+    len = header.bytes + header_comm.bytes + header_code.bytes;
+    avccontext->extradata_size = 64 + len + len/255;
+
+    p = avccontext->extradata = av_mallocz(avccontext->extradata_size);
+    p[0] = 2;
+    offset = 1;
+    offset += av_xiphlacing(&p[offset], header.bytes);
+    offset += av_xiphlacing(&p[offset], header_comm.bytes);
+    memcpy(&p[offset], header.packet, header.bytes);
+    offset += header.bytes;
+    memcpy(&p[offset], header_comm.packet, header_comm.bytes);
+    offset += header_comm.bytes;
+    memcpy(&p[offset], header_code.packet, header_code.bytes);
+    offset += header_code.bytes;
+    avccontext->extradata_size = offset;
+    avccontext->extradata = av_realloc(avccontext->extradata, avccontext->extradata_size);
+
+    avccontext->frame_size = OGGVORBIS_FRAME_SIZE;
+
+    avccontext->coded_frame = avcodec_alloc_frame();
+    avccontext->coded_frame->key_frame = 1;
+
+    return 0;
+}
+
+
+static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * packets, int buf_size, void *data)
+{
+    venc_context_t * venc = avccontext->priv_data;
+    signed short * audio = data;
+    int l, samples = data ? VORBIS_FRAME_SIZE : 0;
+
+
+
+    if (!l) return 0;
+
+    avccontext->coded_frame->pts = av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
+    memcpy(packets, compressed_frame, l);
+    return l;
+}
+
+
+static int vorbis_encode_close(AVCodecContext * avccontext)
+{
+    venc_context_t * venc = avccontext->priv_data;
+
+    av_freep(&avccontext->coded_frame);
+    av_freep(&avccontext->extradata);
+
+    return 0 ;
+}
+
+AVCodec oggvorbis_encoder = {
+    "vorbis",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_VORBIS,
+    sizeof(venc_context_t),
+    vorbis_encode_init,
+    vorbis_encode_frame,
+    vorbis_encode_close,
+    .capabilities= CODEC_CAP_DELAY,
+};