| 1 | /*
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| 2 | * Interface to libfaac for aac encoding
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| 3 | * Copyright (c) 2002 Gildas Bazin <[email protected]>
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU Lesser General Public
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| 7 | * License as published by the Free Software Foundation; either
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| 8 | * version 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This library is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | * Lesser General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU Lesser General Public
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| 16 | * License along with this library; if not, write to the Free Software
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| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 18 | */
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| 19 |
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| 20 | /**
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| 21 | * @file faacaudio.c
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| 22 | * Interface to libfaac for aac encoding.
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| 23 | */
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| 24 |
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| 25 | #include "avcodec.h"
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| 26 | #include <faac.h>
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| 27 |
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| 28 | typedef struct FaacAudioContext {
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| 29 | faacEncHandle faac_handle;
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| 30 | } FaacAudioContext;
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| 31 |
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| 32 | static int Faac_encode_init(AVCodecContext *avctx)
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| 33 | {
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| 34 | FaacAudioContext *s = avctx->priv_data;
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| 35 | faacEncConfigurationPtr faac_cfg;
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| 36 | unsigned long samples_input, max_bytes_output;
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| 37 |
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| 38 | /* number of channels */
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| 39 | if (avctx->channels < 1 || avctx->channels > 6)
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| 40 | return -1;
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| 41 |
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| 42 | s->faac_handle = faacEncOpen(avctx->sample_rate,
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| 43 | avctx->channels,
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| 44 | &samples_input, &max_bytes_output);
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| 45 |
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| 46 | /* check faac version */
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| 47 | faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
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| 48 | if (faac_cfg->version != FAAC_CFG_VERSION) {
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| 49 | av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
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| 50 | faacEncClose(s->faac_handle);
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| 51 | return -1;
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| 52 | }
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| 53 |
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| 54 | /* put the options in the configuration struct */
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| 55 | faac_cfg->aacObjectType = LOW;
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| 56 | faac_cfg->mpegVersion = MPEG4;
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| 57 | faac_cfg->useTns = 0;
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| 58 | faac_cfg->allowMidside = 1;
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| 59 | faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
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| 60 | faac_cfg->bandWidth = avctx->cutoff;
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| 61 | if(avctx->flags & CODEC_FLAG_QSCALE) {
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| 62 | faac_cfg->bitRate = 0;
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| 63 | faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
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| 64 | }
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| 65 | faac_cfg->outputFormat = 1;
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| 66 | faac_cfg->inputFormat = FAAC_INPUT_16BIT;
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| 67 |
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| 68 | avctx->frame_size = samples_input / avctx->channels;
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| 69 |
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| 70 | avctx->coded_frame= avcodec_alloc_frame();
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| 71 | avctx->coded_frame->key_frame= 1;
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| 72 |
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| 73 | /* Set decoder specific info */
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| 74 | avctx->extradata_size = 0;
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| 75 | if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
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| 76 |
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| 77 | unsigned char *buffer;
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| 78 | unsigned long decoder_specific_info_size;
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| 79 |
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| 80 | if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
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| 81 | &decoder_specific_info_size)) {
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| 82 | avctx->extradata = buffer;
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| 83 | avctx->extradata_size = decoder_specific_info_size;
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| 84 | faac_cfg->outputFormat = 0;
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| 85 | }
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| 86 | }
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| 87 |
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| 88 | if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
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| 89 | av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
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| 90 | return -1;
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| 91 | }
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| 92 |
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| 93 | return 0;
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| 94 | }
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| 95 |
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| 96 | int Faac_encode_frame(AVCodecContext *avctx,
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| 97 | unsigned char *frame, int buf_size, void *data)
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| 98 | {
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| 99 | FaacAudioContext *s = avctx->priv_data;
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| 100 | int bytes_written;
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| 101 |
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| 102 | bytes_written = faacEncEncode(s->faac_handle,
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| 103 | data,
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| 104 | avctx->frame_size * avctx->channels,
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| 105 | frame,
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| 106 | buf_size);
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| 107 |
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| 108 | return bytes_written;
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| 109 | }
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| 110 |
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| 111 | int Faac_encode_close(AVCodecContext *avctx)
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| 112 | {
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| 113 | FaacAudioContext *s = avctx->priv_data;
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| 114 |
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| 115 | av_freep(&avctx->coded_frame);
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| 116 |
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| 117 | //if (avctx->extradata_size) free(avctx->extradata);
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| 118 |
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| 119 | faacEncClose(s->faac_handle);
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| 120 | return 0;
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| 121 | }
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| 122 |
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| 123 | AVCodec faac_encoder = {
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| 124 | "aac",
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| 125 | CODEC_TYPE_AUDIO,
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| 126 | CODEC_ID_AAC,
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| 127 | sizeof(FaacAudioContext),
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| 128 | Faac_encode_init,
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| 129 | Faac_encode_frame,
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| 130 | Faac_encode_close
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| 131 | };
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