mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.6 KiB
103 lines
2.6 KiB
/* |
|
* Interface to libmp3lame for mp3 encoding |
|
* Copyright (c) 2002 Lennert Buytenhek <buytenh@gnu.org> |
|
* |
|
* This program is free software; you can redistribute it and/or modify |
|
* it under the terms of the GNU General Public License as published by |
|
* the Free Software Foundation; either version 2 of the License, or |
|
* (at your option) any later version. |
|
* |
|
* This program 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 General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU General Public License |
|
* along with this program; if not, write to the Free Software |
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
|
*/ |
|
|
|
#include "avcodec.h" |
|
#include "mpegaudio.h" |
|
#include <lame/lame.h> |
|
|
|
typedef struct Mp3AudioContext { |
|
lame_global_flags *gfp; |
|
int first_frame; |
|
int stereo; |
|
} Mp3AudioContext; |
|
|
|
|
|
static int MP3lame_encode_init(AVCodecContext *avctx) |
|
{ |
|
Mp3AudioContext *s = avctx->priv_data; |
|
|
|
if (avctx->channels > 2) |
|
return -1; |
|
|
|
s->first_frame = 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->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); |
|
} |
|
|
|
/* lame 3.91 outputs the first frame as garbage */ |
|
if (s->first_frame) |
|
s->first_frame = num = 0; |
|
return num; |
|
} |
|
|
|
int MP3lame_encode_close(AVCodecContext *avctx) |
|
{ |
|
Mp3AudioContext *s = avctx->priv_data; |
|
|
|
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 |
|
};
|
|
|