235 lines
8.6 KiB
C
235 lines
8.6 KiB
C
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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/common.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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int verbosity;
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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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avctx->initial_padding = 512 - 32 + 1;
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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, s->verbosity);
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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_copyright(s->glopts, s->copyright);
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twolame_set_original(s->glopts, s->original);
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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->bit_rate) {
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if ((s->mode == TWOLAME_AUTO_MODE && avctx->channels == 1) || s->mode == TWOLAME_MONO)
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avctx->bit_rate = avctx->sample_rate < 28000 ? 80000 : 192000;
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else
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avctx->bit_rate = avctx->sample_rate < 28000 ? 160000 : 384000;
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}
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if (avctx->flags & AV_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,
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avctx->global_quality / (float) FF_QP2LAMBDA);
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av_log(avctx, AV_LOG_WARNING,
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"VBR in MP2 is a hack, use another codec that supports it.\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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ret = twolame_init_params(s->glopts);
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if (ret) {
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twolame_encode_close(avctx);
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return AVERROR_UNKNOWN;
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}
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return 0;
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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, 0)) < 0)
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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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(const float *)frame->data[0],
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frame->nb_samples,
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avpkt->data,
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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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(const float *)frame->data[0],
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(const float *)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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(const short int *)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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(const short int *)frame->data[0],
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(const short int *)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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av_log(avctx, AV_LOG_ERROR,
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"Unsupported sample format %d.\n", avctx->sample_fmt);
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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) // no bytes written
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return 0;
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if (ret < 0) // twolame error
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return AVERROR_UNKNOWN;
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if (frame) {
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avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
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if (frame->pts != AV_NOPTS_VALUE)
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avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
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} else {
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avpkt->pts = s->next_pts;
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}
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// this is for setting pts for flushed packet(s).
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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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av_shrink_packet(avpkt, ret);
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*got_packet_ptr = 1;
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return 0;
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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, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"},
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{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" },
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{ "stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO }, 0, 0, AE, "mode" },
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{ "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" },
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{ "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" },
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{ "mono", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO }, 0, 0, AE, "mode" },
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{ "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE},
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{ "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "verbosity", "set library optput level (0-10)", OFFSET(verbosity), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 10, AE},
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{ NULL },
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};
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static const AVClass twolame_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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static const AVCodecDefault twolame_defaults[] = {
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{ "b", "0" },
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{ NULL },
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};
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static const int twolame_samplerates[] = {
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16000, 22050, 24000, 32000, 44100, 48000, 0
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};
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AVCodec ff_libtwolame_encoder = {
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.name = "libtwolame",
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.long_name = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_MP2,
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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 = AV_CODEC_CAP_DELAY,
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.defaults = twolame_defaults,
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.priv_class = &twolame_class,
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.sample_fmts = (const enum AVSampleFormat[]) {
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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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},
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.channel_layouts = (const uint64_t[]) {
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AV_CH_LAYOUT_MONO,
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AV_CH_LAYOUT_STEREO,
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0 },
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.supported_samplerates = twolame_samplerates,
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.wrapper_name = "libtwolame",
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};
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