2 * AMR Audio encoder stub
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <vo-amrwbenc/enc_if.h>
25 #include "libavutil/avstring.h"
27 typedef struct AMRWBContext {
34 static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
36 /* make the correspondance between bitrate and mode */
37 static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250,
38 19850, 23050, 23850 };
39 int i, best = -1, min_diff = 0;
42 for (i = 0; i < 9; i++) {
43 if (rates[i] == bitrate)
45 if (best < 0 || abs(rates[i] - bitrate) < min_diff) {
47 min_diff = abs(rates[i] - bitrate);
50 /* no bitrate matching exactly, log a warning */
51 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
52 for (i = 0; i < 9; i++)
53 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f);
54 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f);
55 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
60 static av_cold int amr_wb_encode_init(AVCodecContext *avctx)
62 AMRWBContext *s = avctx->priv_data;
64 if (avctx->sample_rate != 16000) {
65 av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
66 return AVERROR(ENOSYS);
69 if (avctx->channels != 1) {
70 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
71 return AVERROR(ENOSYS);
74 s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
75 s->last_bitrate = avctx->bit_rate;
77 avctx->frame_size = 320;
78 avctx->coded_frame = avcodec_alloc_frame();
80 s->state = E_IF_init();
86 static int amr_wb_encode_close(AVCodecContext *avctx)
88 AMRWBContext *s = avctx->priv_data;
91 av_freep(&avctx->coded_frame);
95 static int amr_wb_encode_frame(AVCodecContext *avctx,
96 unsigned char *frame/*out*/,
97 int buf_size, void *data/*in*/)
99 AMRWBContext *s = avctx->priv_data;
102 if (s->last_bitrate != avctx->bit_rate) {
103 s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
104 s->last_bitrate = avctx->bit_rate;
106 size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx);
110 AVCodec ff_libvo_amrwbenc_encoder = {
114 sizeof(AMRWBContext),
119 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
120 .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn Adaptive Multi-Rate "