mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-25 04:30:02 +00:00
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/*
|
|
* Interface to libmp3lame for mp3 encoding
|
|
* Copyright (c) 2002 Lennert Buytenhek <buytenh@gnu.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "mpegaudio.h"
|
|
#include <lame/lame.h>
|
|
|
|
typedef struct Mp3AudioContext {
|
|
lame_global_flags *gfp;
|
|
int stereo;
|
|
} Mp3AudioContext;
|
|
|
|
|
|
static int MP3lame_encode_init(AVCodecContext *avctx)
|
|
{
|
|
Mp3AudioContext *s = avctx->priv_data;
|
|
|
|
if (avctx->channels > 2)
|
|
return -1;
|
|
|
|
s->stereo = avctx->channels > 1 ? 1 : 0;
|
|
|
|
if ((s->gfp = lame_init()) == NULL)
|
|
goto err;
|
|
lame_set_in_samplerate(s->gfp, avctx->sample_rate);
|
|
lame_set_out_samplerate(s->gfp, avctx->sample_rate);
|
|
lame_set_num_channels(s->gfp, avctx->channels);
|
|
/* lame 3.91 dies on quality != 5 */
|
|
lame_set_quality(s->gfp, 5);
|
|
/* lame 3.91 doesn't work in mono */
|
|
lame_set_mode(s->gfp, JOINT_STEREO);
|
|
lame_set_brate(s->gfp, avctx->bit_rate/1000);
|
|
if (lame_init_params(s->gfp) < 0)
|
|
goto err_close;
|
|
|
|
avctx->frame_size = MPA_FRAME_SIZE;
|
|
|
|
avctx->coded_frame= avcodec_alloc_frame();
|
|
avctx->coded_frame->key_frame= 1;
|
|
|
|
return 0;
|
|
|
|
err_close:
|
|
lame_close(s->gfp);
|
|
err:
|
|
return -1;
|
|
}
|
|
|
|
int MP3lame_encode_frame(AVCodecContext *avctx,
|
|
unsigned char *frame, int buf_size, void *data)
|
|
{
|
|
Mp3AudioContext *s = avctx->priv_data;
|
|
int num;
|
|
|
|
/* lame 3.91 dies on '1-channel interleaved' data */
|
|
if (s->stereo) {
|
|
num = lame_encode_buffer_interleaved(s->gfp, data,
|
|
MPA_FRAME_SIZE, frame, buf_size);
|
|
} else {
|
|
num = lame_encode_buffer(s->gfp, data, data, MPA_FRAME_SIZE,
|
|
frame, buf_size);
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
int MP3lame_encode_close(AVCodecContext *avctx)
|
|
{
|
|
Mp3AudioContext *s = avctx->priv_data;
|
|
|
|
av_freep(&avctx->coded_frame);
|
|
|
|
lame_close(s->gfp);
|
|
return 0;
|
|
}
|
|
|
|
|
|
AVCodec mp3lame_encoder = {
|
|
"mp3",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_MP3LAME,
|
|
sizeof(Mp3AudioContext),
|
|
MP3lame_encode_init,
|
|
MP3lame_encode_frame,
|
|
MP3lame_encode_close
|
|
};
|