| /* |
| * 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 & AV_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)) < 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 = AV_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, |
| }; |
