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107 lines
2.7 KiB
107 lines
2.7 KiB
/* |
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* Interface to libmp3lame for mp3 encoding |
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* Copyright (c) 2002 Lennert Buytenhek <buytenh@gnu.org> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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/** |
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* @file mp3lameaudio.c |
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* Interface to libmp3lame for mp3 encoding. |
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*/ |
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#include "avcodec.h" |
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#include "mpegaudio.h" |
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#include <lame/lame.h> |
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typedef struct Mp3AudioContext { |
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lame_global_flags *gfp; |
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int stereo; |
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} Mp3AudioContext; |
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static int MP3lame_encode_init(AVCodecContext *avctx) |
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{ |
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Mp3AudioContext *s = avctx->priv_data; |
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if (avctx->channels > 2) |
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return -1; |
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s->stereo = avctx->channels > 1 ? 1 : 0; |
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if ((s->gfp = lame_init()) == NULL) |
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goto err; |
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lame_set_in_samplerate(s->gfp, avctx->sample_rate); |
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lame_set_out_samplerate(s->gfp, avctx->sample_rate); |
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lame_set_num_channels(s->gfp, avctx->channels); |
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/* lame 3.91 dies on quality != 5 */ |
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lame_set_quality(s->gfp, 5); |
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/* lame 3.91 doesn't work in mono */ |
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lame_set_mode(s->gfp, JOINT_STEREO); |
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lame_set_brate(s->gfp, avctx->bit_rate/1000); |
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if (lame_init_params(s->gfp) < 0) |
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goto err_close; |
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avctx->frame_size = MPA_FRAME_SIZE; |
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avctx->coded_frame= avcodec_alloc_frame(); |
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avctx->coded_frame->key_frame= 1; |
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return 0; |
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err_close: |
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lame_close(s->gfp); |
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err: |
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return -1; |
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} |
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int MP3lame_encode_frame(AVCodecContext *avctx, |
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unsigned char *frame, int buf_size, void *data) |
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{ |
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Mp3AudioContext *s = avctx->priv_data; |
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int num; |
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/* lame 3.91 dies on '1-channel interleaved' data */ |
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if (s->stereo) { |
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num = lame_encode_buffer_interleaved(s->gfp, data, |
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MPA_FRAME_SIZE, frame, buf_size); |
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} else { |
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num = lame_encode_buffer(s->gfp, data, data, MPA_FRAME_SIZE, |
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frame, buf_size); |
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} |
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return num; |
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} |
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int MP3lame_encode_close(AVCodecContext *avctx) |
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{ |
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Mp3AudioContext *s = avctx->priv_data; |
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av_freep(&avctx->coded_frame); |
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lame_close(s->gfp); |
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return 0; |
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} |
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AVCodec mp3lame_encoder = { |
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"mp3", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_MP3, |
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sizeof(Mp3AudioContext), |
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MP3lame_encode_init, |
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MP3lame_encode_frame, |
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MP3lame_encode_close |
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};
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