git.sesse.net Git - ffmpeg/blob - libavcodec/libtwolame.c

   1 /*
   2  * Interface to libtwolame for mp2 encoding
   3  * Copyright (c) 2012 Paul B Mahol
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Interface to libtwolame for mp2 encoding.
  25  */
  26
  27 #include <twolame.h>
  28
  29 #include "libavutil/opt.h"
  30 #include "avcodec.h"
  31 #include "internal.h"
  32 #include "mpegaudio.h"
  33
  34 typedef struct TWOLAMEContext {
  35     AVClass  *class;
  36     int      mode;
  37     int      psymodel;
  38     int      energy;
  39     int      error_protection;
  40     int      copyright;
  41     int      original;
  42
  43     twolame_options *glopts;
  44     int64_t  next_pts;
  45 } TWOLAMEContext;
  46
  47 static av_cold int twolame_encode_close(AVCodecContext *avctx)
  48 {
  49     TWOLAMEContext *s = avctx->priv_data;
  50     twolame_close(&s->glopts);
  51     return 0;
  52 }
  53
  54 static av_cold int twolame_encode_init(AVCodecContext *avctx)
  55 {
  56     TWOLAMEContext *s = avctx->priv_data;
  57     int ret;
  58
  59     avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME;
  60
  61     s->glopts = twolame_init();
  62     if (!s->glopts)
  63         return AVERROR(ENOMEM);
  64
  65     twolame_set_verbosity(s->glopts, 0);
  66     twolame_set_mode(s->glopts, s->mode);
  67     twolame_set_psymodel(s->glopts, s->psymodel);
  68     twolame_set_energy_levels(s->glopts, s->energy);
  69     twolame_set_error_protection(s->glopts, s->error_protection);
  70
  71     twolame_set_num_channels(s->glopts, avctx->channels);
  72     twolame_set_in_samplerate(s->glopts, avctx->sample_rate);
  73     twolame_set_out_samplerate(s->glopts, avctx->sample_rate);
  74     if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {
  75         twolame_set_VBR(s->glopts, TRUE);
  76         twolame_set_VBR_level(s->glopts, avctx->global_quality);
  77         av_log(avctx, AV_LOG_WARNING, "VBR mode is experimental!\n");
  78     } else {
  79         twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000);
  80     }
  81
  82     if ((ret = twolame_init_params(s->glopts)))
  83         goto error;
  84
  85     return 0;
  86 error:
  87     twolame_encode_close(avctx);
  88     return ret;
  89 }
  90
  91 static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
  92                                 const AVFrame *frame, int *got_packet_ptr)
  93 {
  94     TWOLAMEContext *s = avctx->priv_data;
  95     int ret;
  96
  97     if ((ret = ff_alloc_packet2(avctx, avpkt, MPA_MAX_CODED_FRAME_SIZE)))
  98         return ret;
  99
 100     if (frame) {
 101         switch (avctx->sample_fmt) {
 102         case AV_SAMPLE_FMT_FLT:
 103             ret = twolame_encode_buffer_float32_interleaved(s->glopts,
 104                                         frame->data[0],
 105                                         frame->nb_samples,
 106                                         avpkt->data, avpkt->size);
 107             break;
 108         case AV_SAMPLE_FMT_FLTP:
 109             ret = twolame_encode_buffer_float32(s->glopts,
 110                                         frame->data[0], frame->data[1],
 111                                         frame->nb_samples,
 112                                         avpkt->data, avpkt->size);
 113             break;
 114         case AV_SAMPLE_FMT_S16:
 115             ret = twolame_encode_buffer_interleaved(s->glopts,
 116                                         frame->data[0],
 117                                         frame->nb_samples,
 118                                         avpkt->data, avpkt->size);
 119             break;
 120         case AV_SAMPLE_FMT_S16P:
 121             ret = twolame_encode_buffer(s->glopts,
 122                                         frame->data[0], frame->data[1],
 123                                         frame->nb_samples,
 124                                         avpkt->data, avpkt->size);
 125             break;
 126         default:
 127             return AVERROR_BUG;
 128         }
 129     } else {
 130         ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size);
 131     }
 132
 133     if (ret > 0) {
 134         avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size);
 135         if (frame) {
 136             if (frame->pts != AV_NOPTS_VALUE)
 137                 avpkt->pts  = frame->pts;
 138         } else {
 139             avpkt->pts = s->next_pts;
 140         }
 141         if (avpkt->pts != AV_NOPTS_VALUE)
 142             s->next_pts = avpkt->pts + avpkt->duration;
 143
 144         avpkt->size     = ret;
 145         *got_packet_ptr = 1;
 146         return 0;
 147     }
 148
 149     return ret;
 150 }
 151
 152 #define OFFSET(x) offsetof(TWOLAMEContext, x)
 153 #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 154 static const AVOption options[] = {
 155     { "mode",         "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"},
 156     { "auto",         NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE },          0, 0, AE, "mode" },
 157     { "stereo",       NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO },             0, 0, AE, "mode" },
 158     { "joint_stereo", NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO },       0, 0, AE, "mode" },
 159     { "dual_channel", NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL },       0, 0, AE, "mode" },
 160     { "mono",         NULL,         0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO },               0, 0, AE, "mode" },
 161     { "psymodel",    "Psychoacoustic Model",  OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE},
 162     { "energy_levels","enable energy levels", OFFSET(energy),   AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
 163     { "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
 164     { "copyright",    "set MPEG Audio Copyright flag",  OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
 165     { "original",     "set MPEG Audio Original flag",   OFFSET(original),  AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
 166     { NULL },
 167 };
 168
 169 static const AVClass libtwolame_class = {
 170     .class_name = "libtwolame encoder",
 171     .item_name  = av_default_item_name,
 172     .option     = options,
 173     .version    = LIBAVUTIL_VERSION_INT,
 174 };
 175
 176 AVCodec ff_libtwolame_encoder = {
 177     .name                  = "libtwolame",
 178     .type                  = AVMEDIA_TYPE_AUDIO,
 179     .id                    = AV_CODEC_ID_MP2,
 180     .priv_data_size        = sizeof(TWOLAMEContext),
 181     .init                  = twolame_encode_init,
 182     .encode2               = twolame_encode_frame,
 183     .close                 = twolame_encode_close,
 184     .capabilities          = CODEC_CAP_DELAY,
 185     .sample_fmts           = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
 186                                                              AV_SAMPLE_FMT_FLTP,
 187                                                              AV_SAMPLE_FMT_S16,
 188                                                              AV_SAMPLE_FMT_S16P,
 189                                                              AV_SAMPLE_FMT_NONE },
 190     .channel_layouts       = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
 191                                                   AV_CH_LAYOUT_STEREO,
 192                                                   0 },
 193     .supported_samplerates = (const int[]){ 16000, 22050, 24000, 32000, 44100, 48000, 0 },
 194     .long_name             = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"),
 195     .priv_class            = &libtwolame_class,
 196 };