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skeleton for vorbis_enc.c

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Originally committed as revision 6413 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Oded Shimon 2006-10-02 05:54:55 +00:00
parent 2833fc4646
commit 504d195260
1 changed files with 110 additions and 0 deletions
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libavcodec/vorbis_enc.c Normal file
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/*
* 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,
};