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| 4349 | Serge | 1 | /* |
| 2 | * Interface to libtwolame for mp2 encoding |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * Interface to libtwolame for mp2 encoding. |
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| 25 | */ |
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| 26 | |||
| 27 | #include |
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| 28 | |||
| 29 | #include "libavutil/opt.h" |
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| 30 | #include "avcodec.h" |
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| 31 | #include "internal.h" |
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| 32 | #include "mpegaudio.h" |
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| 33 | |||
| 34 | typedef struct TWOLAMEContext { |
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| 35 | AVClass *class; |
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| 36 | int mode; |
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| 37 | int psymodel; |
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| 38 | int energy; |
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| 39 | int error_protection; |
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| 40 | int copyright; |
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| 41 | int original; |
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| 42 | |||
| 43 | twolame_options *glopts; |
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| 44 | int64_t next_pts; |
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| 45 | } TWOLAMEContext; |
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| 46 | |||
| 47 | static av_cold int twolame_encode_close(AVCodecContext *avctx) |
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| 48 | { |
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| 49 | TWOLAMEContext *s = avctx->priv_data; |
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| 50 | twolame_close(&s->glopts); |
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| 51 | return 0; |
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| 52 | } |
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| 53 | |||
| 54 | static av_cold int twolame_encode_init(AVCodecContext *avctx) |
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| 55 | { |
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| 56 | TWOLAMEContext *s = avctx->priv_data; |
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| 57 | int ret; |
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| 58 | |||
| 59 | avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME; |
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| 60 | |||
| 61 | s->glopts = twolame_init(); |
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| 62 | if (!s->glopts) |
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| 63 | return AVERROR(ENOMEM); |
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| 64 | |||
| 65 | twolame_set_verbosity(s->glopts, 0); |
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| 66 | twolame_set_mode(s->glopts, s->mode); |
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| 67 | twolame_set_psymodel(s->glopts, s->psymodel); |
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| 68 | twolame_set_energy_levels(s->glopts, s->energy); |
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| 69 | twolame_set_error_protection(s->glopts, s->error_protection); |
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| 70 | twolame_set_copyright(s->glopts, s->copyright); |
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| 71 | twolame_set_original(s->glopts, s->original); |
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| 72 | |||
| 73 | twolame_set_num_channels(s->glopts, avctx->channels); |
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| 74 | twolame_set_in_samplerate(s->glopts, avctx->sample_rate); |
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| 75 | twolame_set_out_samplerate(s->glopts, avctx->sample_rate); |
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| 76 | if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) { |
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| 77 | twolame_set_VBR(s->glopts, TRUE); |
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| 78 | twolame_set_VBR_level(s->glopts, avctx->global_quality); |
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| 79 | av_log(avctx, AV_LOG_WARNING, "VBR mode is experimental!\n"); |
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| 80 | } else { |
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| 81 | twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000); |
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| 82 | } |
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| 83 | |||
| 84 | if ((ret = twolame_init_params(s->glopts))) |
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| 85 | goto error; |
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| 86 | |||
| 87 | return 0; |
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| 88 | error: |
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| 89 | twolame_encode_close(avctx); |
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| 90 | return ret; |
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| 91 | } |
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| 92 | |||
| 93 | static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
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| 94 | const AVFrame *frame, int *got_packet_ptr) |
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| 95 | { |
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| 96 | TWOLAMEContext *s = avctx->priv_data; |
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| 97 | int ret; |
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| 98 | |||
| 99 | if ((ret = ff_alloc_packet2(avctx, avpkt, MPA_MAX_CODED_FRAME_SIZE)) < 0) |
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| 100 | return ret; |
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| 101 | |||
| 102 | if (frame) { |
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| 103 | switch (avctx->sample_fmt) { |
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| 104 | case AV_SAMPLE_FMT_FLT: |
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| 105 | ret = twolame_encode_buffer_float32_interleaved(s->glopts, |
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| 106 | frame->data[0], |
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| 107 | frame->nb_samples, |
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| 108 | avpkt->data, avpkt->size); |
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| 109 | break; |
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| 110 | case AV_SAMPLE_FMT_FLTP: |
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| 111 | ret = twolame_encode_buffer_float32(s->glopts, |
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| 112 | frame->data[0], frame->data[1], |
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| 113 | frame->nb_samples, |
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| 114 | avpkt->data, avpkt->size); |
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| 115 | break; |
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| 116 | case AV_SAMPLE_FMT_S16: |
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| 117 | ret = twolame_encode_buffer_interleaved(s->glopts, |
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| 118 | frame->data[0], |
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| 119 | frame->nb_samples, |
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| 120 | avpkt->data, avpkt->size); |
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| 121 | break; |
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| 122 | case AV_SAMPLE_FMT_S16P: |
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| 123 | ret = twolame_encode_buffer(s->glopts, |
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| 124 | frame->data[0], frame->data[1], |
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| 125 | frame->nb_samples, |
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| 126 | avpkt->data, avpkt->size); |
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| 127 | break; |
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| 128 | default: |
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| 129 | return AVERROR_BUG; |
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| 130 | } |
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| 131 | } else { |
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| 132 | ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size); |
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| 133 | } |
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| 134 | |||
| 135 | if (ret > 0) { |
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| 136 | avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size); |
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| 137 | if (frame) { |
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| 138 | if (frame->pts != AV_NOPTS_VALUE) |
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| 139 | avpkt->pts = frame->pts; |
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| 140 | } else { |
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| 141 | avpkt->pts = s->next_pts; |
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| 142 | } |
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| 143 | if (avpkt->pts != AV_NOPTS_VALUE) |
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| 144 | s->next_pts = avpkt->pts + avpkt->duration; |
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| 145 | |||
| 146 | avpkt->size = ret; |
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| 147 | *got_packet_ptr = 1; |
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| 148 | return 0; |
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| 149 | } |
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| 150 | |||
| 151 | return ret; |
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| 152 | } |
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| 153 | |||
| 154 | #define OFFSET(x) offsetof(TWOLAMEContext, x) |
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| 155 | #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM |
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| 156 | static const AVOption options[] = { |
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| 157 | { "mode", "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"}, |
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| 158 | { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" }, |
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| 159 | { "stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO }, 0, 0, AE, "mode" }, |
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| 160 | { "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" }, |
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| 161 | { "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" }, |
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| 162 | { "mono", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO }, 0, 0, AE, "mode" }, |
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| 163 | { "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE}, |
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| 164 | { "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, |
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| 165 | { "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, |
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| 166 | { "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, |
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| 167 | { "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, |
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| 168 | { NULL }, |
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| 169 | }; |
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| 170 | |||
| 171 | static const AVClass libtwolame_class = { |
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| 172 | .class_name = "libtwolame encoder", |
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| 173 | .item_name = av_default_item_name, |
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| 174 | .option = options, |
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| 175 | .version = LIBAVUTIL_VERSION_INT, |
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| 176 | }; |
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| 177 | |||
| 178 | AVCodec ff_libtwolame_encoder = { |
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| 179 | .name = "libtwolame", |
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| 180 | .long_name = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"), |
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| 181 | .type = AVMEDIA_TYPE_AUDIO, |
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| 182 | .id = AV_CODEC_ID_MP2, |
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| 183 | .priv_data_size = sizeof(TWOLAMEContext), |
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| 184 | .init = twolame_encode_init, |
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| 185 | .encode2 = twolame_encode_frame, |
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| 186 | .close = twolame_encode_close, |
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| 187 | .capabilities = CODEC_CAP_DELAY, |
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| 188 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT, |
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| 189 | AV_SAMPLE_FMT_FLTP, |
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| 190 | AV_SAMPLE_FMT_S16, |
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| 191 | AV_SAMPLE_FMT_S16P, |
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| 192 | AV_SAMPLE_FMT_NONE }, |
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| 193 | .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, |
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| 194 | AV_CH_LAYOUT_STEREO, |
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| 195 | |||
| 196 | .supported_samplerates = (const int[]){ 16000, 22050, 24000, 32000, 44100, 48000, 0 }, |
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| 197 | .priv_class = &libtwolame_class, |
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| 198 | }; |