mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
13 years ago
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fe40dc1cec
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/*
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* Interface to libtwolame for mp2 encoding |
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* Copyright (c) 2012 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* Interface to libtwolame for mp2 encoding. |
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*/ |
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#include <twolame.h> |
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#include "libavutil/opt.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "mpegaudio.h" |
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typedef struct TWOLAMEContext { |
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AVClass *class; |
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int mode; |
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int psymodel; |
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int energy; |
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int error_protection; |
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int copyright; |
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int original; |
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twolame_options *glopts; |
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int64_t next_pts; |
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} TWOLAMEContext; |
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static av_cold int twolame_encode_close(AVCodecContext *avctx) |
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{ |
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TWOLAMEContext *s = avctx->priv_data; |
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twolame_close(&s->glopts); |
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return 0; |
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} |
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static av_cold int twolame_encode_init(AVCodecContext *avctx) |
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{ |
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TWOLAMEContext *s = avctx->priv_data; |
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int ret; |
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avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME; |
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s->glopts = twolame_init(); |
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if (!s->glopts) |
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return AVERROR(ENOMEM); |
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twolame_set_verbosity(s->glopts, 0); |
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twolame_set_mode(s->glopts, s->mode); |
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twolame_set_psymodel(s->glopts, s->psymodel); |
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twolame_set_energy_levels(s->glopts, s->energy); |
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twolame_set_error_protection(s->glopts, s->error_protection); |
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twolame_set_num_channels(s->glopts, avctx->channels); |
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twolame_set_in_samplerate(s->glopts, avctx->sample_rate); |
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twolame_set_out_samplerate(s->glopts, avctx->sample_rate); |
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if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) { |
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twolame_set_VBR(s->glopts, TRUE); |
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twolame_set_VBR_level(s->glopts, avctx->global_quality); |
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av_log(avctx, AV_LOG_WARNING, "VBR mode is experimental!\n"); |
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} else { |
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twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000); |
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} |
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if ((ret = twolame_init_params(s->glopts))) |
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goto error; |
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return 0; |
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error: |
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twolame_encode_close(avctx); |
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return ret; |
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} |
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static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
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const AVFrame *frame, int *got_packet_ptr) |
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{ |
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TWOLAMEContext *s = avctx->priv_data; |
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int ret; |
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if ((ret = ff_alloc_packet2(avctx, avpkt, MPA_MAX_CODED_FRAME_SIZE))) |
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return ret; |
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if (frame) { |
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switch (avctx->sample_fmt) { |
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case AV_SAMPLE_FMT_FLT: |
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ret = twolame_encode_buffer_float32_interleaved(s->glopts, |
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frame->data[0], |
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frame->nb_samples, |
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avpkt->data, avpkt->size); |
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break; |
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case AV_SAMPLE_FMT_FLTP: |
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ret = twolame_encode_buffer_float32(s->glopts, |
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frame->data[0], frame->data[1], |
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frame->nb_samples, |
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avpkt->data, avpkt->size); |
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break; |
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case AV_SAMPLE_FMT_S16: |
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ret = twolame_encode_buffer_interleaved(s->glopts, |
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frame->data[0], |
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frame->nb_samples, |
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avpkt->data, avpkt->size); |
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break; |
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case AV_SAMPLE_FMT_S16P: |
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ret = twolame_encode_buffer(s->glopts, |
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frame->data[0], frame->data[1], |
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frame->nb_samples, |
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avpkt->data, avpkt->size); |
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break; |
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default: |
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return AVERROR_BUG; |
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} |
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} else { |
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ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size); |
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} |
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if (ret > 0) { |
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avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size); |
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if (frame) { |
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if (frame->pts != AV_NOPTS_VALUE) |
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avpkt->pts = frame->pts; |
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} else { |
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avpkt->pts = s->next_pts; |
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} |
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if (avpkt->pts != AV_NOPTS_VALUE) |
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s->next_pts = avpkt->pts + avpkt->duration; |
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avpkt->size = ret; |
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*got_packet_ptr = 1; |
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return 0; |
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} |
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return ret; |
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} |
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#define OFFSET(x) offsetof(TWOLAMEContext, x) |
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#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM |
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static const AVOption options[] = { |
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{ "mode", "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"}, |
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{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" }, |
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{ "stereo", NULL, 0, AV_OPT_TYPE_CONST, { TWOLAME_STEREO }, 0, 0, AE, "mode" }, |
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{ "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" }, |
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{ "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" }, |
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{ "mono", NULL, 0, AV_OPT_TYPE_CONST, { TWOLAME_MONO }, 0, 0, AE, "mode" }, |
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{ "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { 3 }, -1, 4, AE}, |
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{ "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { 0 }, 0, 1, AE}, |
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{ "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { 0 }, 0, 1, AE}, |
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{ "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { 0 }, 0, 1, AE}, |
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{ "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { 0 }, 0, 1, AE}, |
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{ NULL }, |
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}; |
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static const AVClass libtwolame_class = { |
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.class_name = "libtwolame encoder", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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AVCodec ff_libtwolame_encoder = { |
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.name = "libtwolame", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = CODEC_ID_MP3, |
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.priv_data_size = sizeof(TWOLAMEContext), |
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.init = twolame_encode_init, |
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.encode2 = twolame_encode_frame, |
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.close = twolame_encode_close, |
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.capabilities = CODEC_CAP_DELAY, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT, |
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AV_SAMPLE_FMT_FLTP, |
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AV_SAMPLE_FMT_S16, |
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AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_NONE }, |
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.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, |
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AV_CH_LAYOUT_STEREO, |
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0 }, |
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.supported_samplerates = (const int[]){ 16000, 22050, 24000, 32000, 44100, 48000, 0 }, |
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.long_name = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"), |
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.priv_class = &libtwolame_class, |
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}; |
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