From f502ff3f61dfdc7c4180b6a24cec6237c38bc148 Mon Sep 17 00:00:00 2001 From: Martin Storsjö Date: Tue, 29 Dec 2009 16:48:09 +0200 Subject: Add support for AMR-WB encoding via libvo-amrwbenc MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The wrapper code is based on the libamr wrapper removed in SVN rev 19365. Signed-off-by: Martin Storsjö --- libavcodec/libvo-amrwbenc.c | 127 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 libavcodec/libvo-amrwbenc.c (limited to 'libavcodec/libvo-amrwbenc.c') diff --git a/libavcodec/libvo-amrwbenc.c b/libavcodec/libvo-amrwbenc.c new file mode 100644 index 0000000000..6f26d9b8af --- /dev/null +++ b/libavcodec/libvo-amrwbenc.c @@ -0,0 +1,127 @@ +/* + * AMR Audio encoder stub + * Copyright (c) 2003 the ffmpeg project + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +#include "avcodec.h" + +static const char wb_bitrate_unsupported[] = + "bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, " + "18.25k, 19.85k, 23.05k, or 23.85k\n"; + +typedef struct AMRWB_bitrates { + int rate; + int mode; +} AMRWB_bitrates; + +typedef struct AMRWBContext { + void *state; + int mode; + int allow_dtx; +} AMRWBContext; + +static int getWBBitrateMode(int bitrate) +{ + /* make the correspondance between bitrate and mode */ + AMRWB_bitrates rates[] = { { 6600, 0}, + { 8850, 1}, + {12650, 2}, + {14250, 3}, + {15850, 4}, + {18250, 5}, + {19850, 6}, + {23050, 7}, + {23850, 8}, }; + int i; + + for (i = 0; i < 9; i++) + if (rates[i].rate == bitrate) + return rates[i].mode; + /* no bitrate matching, return an error */ + return -1; +} + +static av_cold int amr_wb_encode_init(AVCodecContext *avctx) +{ + AMRWBContext *s = avctx->priv_data; + + if (avctx->sample_rate != 16000) { + av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n"); + return -1; + } + + if (avctx->channels != 1) { + av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); + return -1; + } + + if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) { + av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported); + return -1; + } + + avctx->frame_size = 320; + avctx->coded_frame = avcodec_alloc_frame(); + + s->state = E_IF_init(); + s->allow_dtx = 0; + + return 0; +} + +static int amr_wb_encode_close(AVCodecContext *avctx) +{ + AMRWBContext *s = avctx->priv_data; + + E_IF_exit(s->state); + av_freep(&avctx->coded_frame); + return 0; +} + +static int amr_wb_encode_frame(AVCodecContext *avctx, + unsigned char *frame/*out*/, + int buf_size, void *data/*in*/) +{ + AMRWBContext *s = avctx->priv_data; + int size; + + if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) { + av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported); + return -1; + } + size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx); + return size; +} + +AVCodec ff_libvo_amrwbenc_encoder = { + "libvo_amrwbenc", + CODEC_TYPE_AUDIO, + CODEC_ID_AMR_WB, + sizeof(AMRWBContext), + amr_wb_encode_init, + amr_wb_encode_frame, + amr_wb_encode_close, + NULL, + .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("libvo-amrwbenc Adaptive Multi-Rate " + "(AMR) Wide-Band"), +}; + -- cgit v1.2.3