/* * 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, };