1/* 2 * AMR Audio encoder stub 3 * Copyright (c) 2003 the ffmpeg project 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#include <vo-amrwbenc/enc_if.h> 23#include <stdio.h> 24#include <stdlib.h> 25 26#include "libavutil/avstring.h" 27#include "libavutil/internal.h" 28#include "libavutil/mem.h" 29#include "libavutil/opt.h" 30#include "avcodec.h" 31#include "internal.h" 32 33#define MAX_PACKET_SIZE (1 + (477 + 7) / 8) 34 35typedef struct AMRWBContext { 36 AVClass *av_class; 37 void *state; 38 int mode; 39 int last_bitrate; 40 int allow_dtx; 41} AMRWBContext; 42 43static const AVOption options[] = { 44 { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRWBContext, allow_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM }, 45 { NULL } 46}; 47 48static const AVClass amrwb_class = { 49 "libvo_amrwbenc", av_default_item_name, options, LIBAVUTIL_VERSION_INT 50}; 51 52static int get_wb_bitrate_mode(int bitrate, void *log_ctx) 53{ 54 /* make the correspondance between bitrate and mode */ 55 static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250, 56 19850, 23050, 23850 }; 57 int i, best = -1, min_diff = 0; 58 char log_buf[200]; 59 60 for (i = 0; i < 9; i++) { 61 if (rates[i] == bitrate) 62 return i; 63 if (best < 0 || abs(rates[i] - bitrate) < min_diff) { 64 best = i; 65 min_diff = abs(rates[i] - bitrate); 66 } 67 } 68 /* no bitrate matching exactly, log a warning */ 69 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of "); 70 for (i = 0; i < 9; i++) 71 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f); 72 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f); 73 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf); 74 75 return best; 76} 77 78static av_cold int amr_wb_encode_init(AVCodecContext *avctx) 79{ 80 AMRWBContext *s = avctx->priv_data; 81 82 if (avctx->sample_rate != 16000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) { 83 av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n"); 84 return AVERROR(ENOSYS); 85 } 86 87 if (avctx->channels != 1) { 88 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); 89 return AVERROR(ENOSYS); 90 } 91 92 s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx); 93 s->last_bitrate = avctx->bit_rate; 94 95 avctx->frame_size = 320; 96 avctx->delay = 80; 97 98 s->state = E_IF_init(); 99 100 return 0; 101} 102 103static int amr_wb_encode_close(AVCodecContext *avctx) 104{ 105 AMRWBContext *s = avctx->priv_data; 106 107 E_IF_exit(s->state); 108 return 0; 109} 110 111static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, 112 const AVFrame *frame, int *got_packet_ptr) 113{ 114 AMRWBContext *s = avctx->priv_data; 115 const int16_t *samples = (const int16_t *)frame->data[0]; 116 int size, ret; 117 118 if ((ret = ff_alloc_packet2(avctx, avpkt, MAX_PACKET_SIZE)) < 0) 119 return ret; 120 121 if (s->last_bitrate != avctx->bit_rate) { 122 s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx); 123 s->last_bitrate = avctx->bit_rate; 124 } 125 size = E_IF_encode(s->state, s->mode, samples, avpkt->data, s->allow_dtx); 126 if (size <= 0 || size > MAX_PACKET_SIZE) { 127 av_log(avctx, AV_LOG_ERROR, "Error encoding frame\n"); 128 return AVERROR(EINVAL); 129 } 130 131 if (frame->pts != AV_NOPTS_VALUE) 132 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay); 133 134 avpkt->size = size; 135 *got_packet_ptr = 1; 136 return 0; 137} 138 139AVCodec ff_libvo_amrwbenc_encoder = { 140 .name = "libvo_amrwbenc", 141 .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AMR-WB " 142 "(Adaptive Multi-Rate Wide-Band)"), 143 .type = AVMEDIA_TYPE_AUDIO, 144 .id = AV_CODEC_ID_AMR_WB, 145 .priv_data_size = sizeof(AMRWBContext), 146 .init = amr_wb_encode_init, 147 .encode2 = amr_wb_encode_frame, 148 .close = amr_wb_encode_close, 149 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, 150 AV_SAMPLE_FMT_NONE }, 151 .priv_class = &amrwb_class, 152}; 153