-/*
- * 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
- */
-
-/**
- * @file mp3lameaudio.c
- * Interface to libmp3lame for mp3 encoding.
- */
-
-#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_MP3,
- sizeof(Mp3AudioContext),
- MP3lame_encode_init,
- MP3lame_encode_frame,
- MP3lame_encode_close
-};