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/*
* Interface to libtwolame for mp2 encoding
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Interface to libtwolame for mp2 encoding.
*/
#include <twolame.h>
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "mpegaudio.h"
typedef struct TWOLAMEContext {
AVClass *class;
int mode;
int psymodel;
int energy;
int error_protection;
int copyright;
int original;
int verbosity;
twolame_options *glopts;
int64_t next_pts;
} TWOLAMEContext;
static av_cold int twolame_encode_close(AVCodecContext *avctx)
{
TWOLAMEContext *s = avctx->priv_data;
twolame_close(&s->glopts);
return 0;
}
static av_cold int twolame_encode_init(AVCodecContext *avctx)
{
TWOLAMEContext *s = avctx->priv_data;
int ret;
avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME;
avctx->initial_padding = 512 - 32 + 1;
s->glopts = twolame_init();
if (!s->glopts)
return AVERROR(ENOMEM);
twolame_set_verbosity(s->glopts, s->verbosity);
twolame_set_mode(s->glopts, s->mode);
twolame_set_psymodel(s->glopts, s->psymodel);
twolame_set_energy_levels(s->glopts, s->energy);
twolame_set_error_protection(s->glopts, s->error_protection);
twolame_set_copyright(s->glopts, s->copyright);
twolame_set_original(s->glopts, s->original);
twolame_set_num_channels(s->glopts, avctx->channels);
twolame_set_in_samplerate(s->glopts, avctx->sample_rate);
twolame_set_out_samplerate(s->glopts, avctx->sample_rate);
if (!avctx->bit_rate)
avctx->bit_rate = avctx->sample_rate < 28000 ? 160000 : 384000;
if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {
twolame_set_VBR(s->glopts, TRUE);
twolame_set_VBR_level(s->glopts,
avctx->global_quality / (float) FF_QP2LAMBDA);
av_log(avctx, AV_LOG_WARNING,
"VBR in MP2 is a hack, use another codec that supports it.\n");
} else {
twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000);
}
ret = twolame_init_params(s->glopts);
if (ret) {
twolame_encode_close(avctx);
return AVERROR_UNKNOWN;
}
return 0;
}
static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
TWOLAMEContext *s = avctx->priv_data;
int ret;
if ((ret = ff_alloc_packet2(avctx, avpkt, MPA_MAX_CODED_FRAME_SIZE)) < 0)
return ret;
if (frame) {
switch (avctx->sample_fmt) {
case AV_SAMPLE_FMT_FLT:
ret = twolame_encode_buffer_float32_interleaved(s->glopts,
(const float *)frame->data[0],
frame->nb_samples,
avpkt->data,
avpkt->size);
break;
case AV_SAMPLE_FMT_FLTP:
ret = twolame_encode_buffer_float32(s->glopts,
(const float *)frame->data[0],
(const float *)frame->data[1],
frame->nb_samples,
avpkt->data, avpkt->size);
break;
case AV_SAMPLE_FMT_S16:
ret = twolame_encode_buffer_interleaved(s->glopts,
(const short int *)frame->data[0],
frame->nb_samples,
avpkt->data, avpkt->size);
break;
case AV_SAMPLE_FMT_S16P:
ret = twolame_encode_buffer(s->glopts,
(const short int *)frame->data[0],
(const short int *)frame->data[1],
frame->nb_samples,
avpkt->data, avpkt->size);
break;
default:
av_log(avctx, AV_LOG_ERROR,
"Unsupported sample format %d.\n", avctx->sample_fmt);
return AVERROR_BUG;
}
} else {
ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size);
}
if (!ret) // no bytes written
return 0;
if (ret < 0) // twolame error
return AVERROR_UNKNOWN;
if (frame) {
avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
if (frame->pts != AV_NOPTS_VALUE)
avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
} else {
avpkt->pts = s->next_pts;
}
// this is for setting pts for flushed packet(s).
if (avpkt->pts != AV_NOPTS_VALUE)
s->next_pts = avpkt->pts + avpkt->duration;
av_shrink_packet(avpkt, ret);
*got_packet_ptr = 1;
return 0;
}
#define OFFSET(x) offsetof(TWOLAMEContext, x)
#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "mode", "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"},
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" },
{ "stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO }, 0, 0, AE, "mode" },
{ "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" },
{ "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" },
{ "mono", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO }, 0, 0, AE, "mode" },
{ "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE},
{ "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "verbosity", "set library optput level (0-10)", OFFSET(verbosity), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 10, AE},
{ NULL },
};
static const AVClass twolame_class = {
.class_name = "libtwolame encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVCodecDefault twolame_defaults[] = {
{ "b", "0" },
{ NULL },
};
static const int twolame_samplerates[] = {
16000, 22050, 24000, 32000, 44100, 48000, 0
};
AVCodec ff_libtwolame_encoder = {
.name = "libtwolame",
.long_name = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_MP2,
.priv_data_size = sizeof(TWOLAMEContext),
.init = twolame_encode_init,
.encode2 = twolame_encode_frame,
.close = twolame_encode_close,
.capabilities = CODEC_CAP_DELAY,
.defaults = twolame_defaults,
.priv_class = &twolame_class,
.sample_fmts = (const enum AVSampleFormat[]) {
AV_SAMPLE_FMT_FLT,
AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE
},
.channel_layouts = (const uint64_t[]) {
AV_CH_LAYOUT_MONO,
AV_CH_LAYOUT_STEREO,
0 },
.supported_samplerates = twolame_samplerates,
};
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