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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. |
*/ |
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#include <twolame.h> |
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#include "libavutil/opt.h" |
#include "avcodec.h" |
#include "internal.h" |
#include "mpegaudio.h" |
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typedef struct TWOLAMEContext { |
AVClass *class; |
int mode; |
int psymodel; |
int energy; |
int error_protection; |
int copyright; |
int original; |
|
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; |
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s->glopts = twolame_init(); |
if (!s->glopts) |
return AVERROR(ENOMEM); |
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twolame_set_verbosity(s->glopts, 0); |
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); |
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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->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) { |
twolame_set_VBR(s->glopts, TRUE); |
twolame_set_VBR_level(s->glopts, avctx->global_quality); |
av_log(avctx, AV_LOG_WARNING, "VBR mode is experimental!\n"); |
} else { |
twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000); |
} |
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if ((ret = twolame_init_params(s->glopts))) |
goto error; |
|
return 0; |
error: |
twolame_encode_close(avctx); |
return ret; |
} |
|
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; |
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if (frame) { |
switch (avctx->sample_fmt) { |
case AV_SAMPLE_FMT_FLT: |
ret = twolame_encode_buffer_float32_interleaved(s->glopts, |
frame->data[0], |
frame->nb_samples, |
avpkt->data, avpkt->size); |
break; |
case AV_SAMPLE_FMT_FLTP: |
ret = twolame_encode_buffer_float32(s->glopts, |
frame->data[0], frame->data[1], |
frame->nb_samples, |
avpkt->data, avpkt->size); |
break; |
case AV_SAMPLE_FMT_S16: |
ret = twolame_encode_buffer_interleaved(s->glopts, |
frame->data[0], |
frame->nb_samples, |
avpkt->data, avpkt->size); |
break; |
case AV_SAMPLE_FMT_S16P: |
ret = twolame_encode_buffer(s->glopts, |
frame->data[0], frame->data[1], |
frame->nb_samples, |
avpkt->data, avpkt->size); |
break; |
default: |
return AVERROR_BUG; |
} |
} else { |
ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size); |
} |
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if (ret > 0) { |
avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size); |
if (frame) { |
if (frame->pts != AV_NOPTS_VALUE) |
avpkt->pts = frame->pts; |
} else { |
avpkt->pts = s->next_pts; |
} |
if (avpkt->pts != AV_NOPTS_VALUE) |
s->next_pts = avpkt->pts + avpkt->duration; |
|
avpkt->size = ret; |
*got_packet_ptr = 1; |
return 0; |
} |
|
return ret; |
} |
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#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}, |
{ NULL }, |
}; |
|
static const AVClass libtwolame_class = { |
.class_name = "libtwolame encoder", |
.item_name = av_default_item_name, |
.option = options, |
.version = LIBAVUTIL_VERSION_INT, |
}; |
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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, |
.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 = (const int[]){ 16000, 22050, 24000, 32000, 44100, 48000, 0 }, |
.priv_class = &libtwolame_class, |
}; |