| 1 | /* |
| 2 | * Interface to libaacplus for aac+ (sbr+ps) encoding |
| 3 | * Copyright (c) 2010 tipok <piratfm@gmail.com> |
| 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 libaacplus for aac+ (sbr+ps) encoding. |
| 25 | */ |
| 26 | |
| 27 | #include <aacplus.h> |
| 28 | |
| 29 | #include "avcodec.h" |
| 30 | #include "internal.h" |
| 31 | |
| 32 | typedef struct aacPlusAudioContext { |
| 33 | aacplusEncHandle aacplus_handle; |
| 34 | unsigned long max_output_bytes; |
| 35 | unsigned long samples_input; |
| 36 | } aacPlusAudioContext; |
| 37 | |
| 38 | static av_cold int aacPlus_encode_init(AVCodecContext *avctx) |
| 39 | { |
| 40 | aacPlusAudioContext *s = avctx->priv_data; |
| 41 | aacplusEncConfiguration *aacplus_cfg; |
| 42 | |
| 43 | /* number of channels */ |
| 44 | if (avctx->channels < 1 || avctx->channels > 2) { |
| 45 | av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels); |
| 46 | return AVERROR(EINVAL); |
| 47 | } |
| 48 | |
| 49 | if (avctx->profile != FF_PROFILE_AAC_LOW && avctx->profile != FF_PROFILE_UNKNOWN) { |
| 50 | av_log(avctx, AV_LOG_ERROR, "invalid AAC profile: %d, only LC supported\n", avctx->profile); |
| 51 | return AVERROR(EINVAL); |
| 52 | } |
| 53 | |
| 54 | s->aacplus_handle = aacplusEncOpen(avctx->sample_rate, avctx->channels, |
| 55 | &s->samples_input, &s->max_output_bytes); |
| 56 | if (!s->aacplus_handle) { |
| 57 | av_log(avctx, AV_LOG_ERROR, "can't open encoder\n"); |
| 58 | return AVERROR(EINVAL); |
| 59 | } |
| 60 | |
| 61 | /* check aacplus version */ |
| 62 | aacplus_cfg = aacplusEncGetCurrentConfiguration(s->aacplus_handle); |
| 63 | |
| 64 | aacplus_cfg->bitRate = avctx->bit_rate; |
| 65 | aacplus_cfg->bandWidth = avctx->cutoff; |
| 66 | aacplus_cfg->outputFormat = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER); |
| 67 | aacplus_cfg->inputFormat = avctx->sample_fmt == AV_SAMPLE_FMT_FLT ? AACPLUS_INPUT_FLOAT : AACPLUS_INPUT_16BIT; |
| 68 | if (!aacplusEncSetConfiguration(s->aacplus_handle, aacplus_cfg)) { |
| 69 | av_log(avctx, AV_LOG_ERROR, "libaacplus doesn't support this output format!\n"); |
| 70 | return AVERROR(EINVAL); |
| 71 | } |
| 72 | |
| 73 | avctx->frame_size = s->samples_input / avctx->channels; |
| 74 | |
| 75 | /* Set decoder specific info */ |
| 76 | avctx->extradata_size = 0; |
| 77 | if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) { |
| 78 | |
| 79 | unsigned char *buffer = NULL; |
| 80 | unsigned long decoder_specific_info_size; |
| 81 | |
| 82 | if (aacplusEncGetDecoderSpecificInfo(s->aacplus_handle, &buffer, |
| 83 | &decoder_specific_info_size) == 1) { |
| 84 | avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE); |
| 85 | avctx->extradata_size = decoder_specific_info_size; |
| 86 | memcpy(avctx->extradata, buffer, avctx->extradata_size); |
| 87 | } |
| 88 | free(buffer); |
| 89 | } |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int aacPlus_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
| 94 | const AVFrame *frame, int *got_packet) |
| 95 | { |
| 96 | aacPlusAudioContext *s = avctx->priv_data; |
| 97 | int32_t *input_buffer = (int32_t *)frame->data[0]; |
| 98 | int ret; |
| 99 | |
| 100 | if ((ret = ff_alloc_packet2(avctx, pkt, s->max_output_bytes)) < 0) |
| 101 | return ret; |
| 102 | |
| 103 | pkt->size = aacplusEncEncode(s->aacplus_handle, input_buffer, |
| 104 | s->samples_input, pkt->data, pkt->size); |
| 105 | *got_packet = 1; |
| 106 | pkt->pts = frame->pts; |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static av_cold int aacPlus_encode_close(AVCodecContext *avctx) |
| 111 | { |
| 112 | aacPlusAudioContext *s = avctx->priv_data; |
| 113 | |
| 114 | av_freep(&avctx->extradata); |
| 115 | aacplusEncClose(s->aacplus_handle); |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static const AVProfile profiles[] = { |
| 121 | { FF_PROFILE_AAC_LOW, "LC" }, |
| 122 | { FF_PROFILE_UNKNOWN }, |
| 123 | }; |
| 124 | |
| 125 | AVCodec ff_libaacplus_encoder = { |
| 126 | .name = "libaacplus", |
| 127 | .long_name = NULL_IF_CONFIG_SMALL("libaacplus AAC+ (Advanced Audio Codec with SBR+PS)"), |
| 128 | .type = AVMEDIA_TYPE_AUDIO, |
| 129 | .id = AV_CODEC_ID_AAC, |
| 130 | .priv_data_size = sizeof(aacPlusAudioContext), |
| 131 | .init = aacPlus_encode_init, |
| 132 | .encode2 = aacPlus_encode_frame, |
| 133 | .close = aacPlus_encode_close, |
| 134 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, |
| 135 | AV_SAMPLE_FMT_FLT, |
| 136 | AV_SAMPLE_FMT_NONE }, |
| 137 | .profiles = profiles, |
| 138 | .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, |
| 139 | AV_CH_LAYOUT_STEREO, |
| 140 | 0 }, |
| 141 | }; |