yading@10: /*
yading@10:  * Interface to libtwolame for mp2 encoding
yading@10:  * Copyright (c) 2012 Paul B Mahol
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Interface to libtwolame for mp2 encoding.
yading@10:  */
yading@10: 
yading@10: #include <twolame.h>
yading@10: 
yading@10: #include "libavutil/opt.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "mpegaudio.h"
yading@10: 
yading@10: typedef struct TWOLAMEContext {
yading@10:     AVClass  *class;
yading@10:     int      mode;
yading@10:     int      psymodel;
yading@10:     int      energy;
yading@10:     int      error_protection;
yading@10:     int      copyright;
yading@10:     int      original;
yading@10: 
yading@10:     twolame_options *glopts;
yading@10:     int64_t  next_pts;
yading@10: } TWOLAMEContext;
yading@10: 
yading@10: static av_cold int twolame_encode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     TWOLAMEContext *s = avctx->priv_data;
yading@10:     twolame_close(&s->glopts);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int twolame_encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     TWOLAMEContext *s = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME;
yading@10: 
yading@10:     s->glopts = twolame_init();
yading@10:     if (!s->glopts)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     twolame_set_verbosity(s->glopts, 0);
yading@10:     twolame_set_mode(s->glopts, s->mode);
yading@10:     twolame_set_psymodel(s->glopts, s->psymodel);
yading@10:     twolame_set_energy_levels(s->glopts, s->energy);
yading@10:     twolame_set_error_protection(s->glopts, s->error_protection);
yading@10: 
yading@10:     twolame_set_num_channels(s->glopts, avctx->channels);
yading@10:     twolame_set_in_samplerate(s->glopts, avctx->sample_rate);
yading@10:     twolame_set_out_samplerate(s->glopts, avctx->sample_rate);
yading@10:     if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {
yading@10:         twolame_set_VBR(s->glopts, TRUE);
yading@10:         twolame_set_VBR_level(s->glopts, avctx->global_quality);
yading@10:         av_log(avctx, AV_LOG_WARNING, "VBR mode is experimental!\n");
yading@10:     } else {
yading@10:         twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000);
yading@10:     }
yading@10: 
yading@10:     if ((ret = twolame_init_params(s->glopts)))
yading@10:         goto error;
yading@10: 
yading@10:     return 0;
yading@10: error:
yading@10:     twolame_encode_close(avctx);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
yading@10:                                 const AVFrame *frame, int *got_packet_ptr)
yading@10: {
yading@10:     TWOLAMEContext *s = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, avpkt, MPA_MAX_CODED_FRAME_SIZE)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (frame) {
yading@10:         switch (avctx->sample_fmt) {
yading@10:         case AV_SAMPLE_FMT_FLT:
yading@10:             ret = twolame_encode_buffer_float32_interleaved(s->glopts,
yading@10:                                         frame->data[0],
yading@10:                                         frame->nb_samples,
yading@10:                                         avpkt->data, avpkt->size);
yading@10:             break;
yading@10:         case AV_SAMPLE_FMT_FLTP:
yading@10:             ret = twolame_encode_buffer_float32(s->glopts,
yading@10:                                         frame->data[0], frame->data[1],
yading@10:                                         frame->nb_samples,
yading@10:                                         avpkt->data, avpkt->size);
yading@10:             break;
yading@10:         case AV_SAMPLE_FMT_S16:
yading@10:             ret = twolame_encode_buffer_interleaved(s->glopts,
yading@10:                                         frame->data[0],
yading@10:                                         frame->nb_samples,
yading@10:                                         avpkt->data, avpkt->size);
yading@10:             break;
yading@10:         case AV_SAMPLE_FMT_S16P:
yading@10:             ret = twolame_encode_buffer(s->glopts,
yading@10:                                         frame->data[0], frame->data[1],
yading@10:                                         frame->nb_samples,
yading@10:                                         avpkt->data, avpkt->size);
yading@10:             break;
yading@10:         default:
yading@10:             return AVERROR_BUG;
yading@10:         }
yading@10:     } else {
yading@10:         ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size);
yading@10:     }
yading@10: 
yading@10:     if (ret > 0) {
yading@10:         avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size);
yading@10:         if (frame) {
yading@10:             if (frame->pts != AV_NOPTS_VALUE)
yading@10:                 avpkt->pts  = frame->pts;
yading@10:         } else {
yading@10:             avpkt->pts = s->next_pts;
yading@10:         }
yading@10:         if (avpkt->pts != AV_NOPTS_VALUE)
yading@10:             s->next_pts = avpkt->pts + avpkt->duration;
yading@10: 
yading@10:         avpkt->size     = ret;
yading@10:         *got_packet_ptr = 1;
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(TWOLAMEContext, x)
yading@10: #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
yading@10: static const AVOption options[] = {
yading@10:     { "mode",         "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"},
yading@10:     { "auto",         NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE },          0, 0, AE, "mode" },
yading@10:     { "stereo",       NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO },             0, 0, AE, "mode" },
yading@10:     { "joint_stereo", NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO },       0, 0, AE, "mode" },
yading@10:     { "dual_channel", NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL },       0, 0, AE, "mode" },
yading@10:     { "mono",         NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO },               0, 0, AE, "mode" },
yading@10:     { "psymodel",    "Psychoacoustic Model",  OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE},
yading@10:     { "energy_levels","enable energy levels", OFFSET(energy),   AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
yading@10:     { "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
yading@10:     { "copyright",    "set MPEG Audio Copyright flag",  OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
yading@10:     { "original",     "set MPEG Audio Original flag",   OFFSET(original),  AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass libtwolame_class = {
yading@10:     .class_name = "libtwolame encoder",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVCodec ff_libtwolame_encoder = {
yading@10:     .name                  = "libtwolame",
yading@10:     .type                  = AVMEDIA_TYPE_AUDIO,
yading@10:     .id                    = AV_CODEC_ID_MP2,
yading@10:     .priv_data_size        = sizeof(TWOLAMEContext),
yading@10:     .init                  = twolame_encode_init,
yading@10:     .encode2               = twolame_encode_frame,
yading@10:     .close                 = twolame_encode_close,
yading@10:     .capabilities          = CODEC_CAP_DELAY,
yading@10:     .sample_fmts           = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
yading@10:                                                              AV_SAMPLE_FMT_FLTP,
yading@10:                                                              AV_SAMPLE_FMT_S16,
yading@10:                                                              AV_SAMPLE_FMT_S16P,
yading@10:                                                              AV_SAMPLE_FMT_NONE },
yading@10:     .channel_layouts       = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
yading@10:                                                   AV_CH_LAYOUT_STEREO,
yading@10:                                                   0 },
yading@10:     .supported_samplerates = (const int[]){ 16000, 22050, 24000, 32000, 44100, 48000, 0 },
yading@10:     .long_name             = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"),
yading@10:     .priv_class            = &libtwolame_class,
yading@10: };