| 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 | |
| 35 | typedef struct AMRWBContext { |
| 36 | AVClass *av_class; |
| 37 | void *state; |
| 38 | int mode; |
| 39 | int last_bitrate; |
| 40 | int allow_dtx; |
| 41 | } AMRWBContext; |
| 42 | |
| 43 | static 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 | |
| 48 | static const AVClass amrwb_class = { |
| 49 | "libvo_amrwbenc", av_default_item_name, options, LIBAVUTIL_VERSION_INT |
| 50 | }; |
| 51 | |
| 52 | static 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 | |
| 78 | static 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 | |
| 103 | static 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 | |
| 111 | static 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 | |
| 139 | AVCodec 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 | }; |