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https://github.com/FFmpeg/FFmpeg.git
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449 lines
12 KiB
C
449 lines
12 KiB
C
/*
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* AMR Audio decoder stub
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* Copyright (c) 2003 the ffmpeg project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/** @file
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* Adaptive Multi-Rate (AMR) Audio decoder stub.
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*
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* This code implements both an AMR-NarrowBand (AMR-NB) and an AMR-WideBand
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* (AMR-WB) audio encoder/decoder through external reference code from
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* http://www.3gpp.org/. The license of the code from 3gpp is unclear so you
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* have to download the code separately.
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*
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* \section AMR-NB
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*
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* The float version (default) can be downloaded from:
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* http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-610.zip
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*
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* \subsection Specification
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* The specification for AMR-NB can be found in TS 26.071
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* (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
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* info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
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*
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* \section AMR-WB
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*
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* The reference code can be downloaded from:
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* http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-600.zip
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*
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* \subsection Specification
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* The specification for AMR-WB can be found in TS 26.171
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* (http://www.3gpp.org/ftp/Specs/html-info/26171.htm) and some other
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* info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
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*
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*/
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#include "avcodec.h"
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static void amr_decode_fix_avctx(AVCodecContext *avctx)
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{
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const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
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if (!avctx->sample_rate)
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avctx->sample_rate = 8000 * is_amr_wb;
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if (!avctx->channels)
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avctx->channels = 1;
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avctx->frame_size = 160 * is_amr_wb;
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avctx->sample_fmt = SAMPLE_FMT_S16;
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}
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#if CONFIG_LIBAMR_NB
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#include <amrnb/interf_dec.h>
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#include <amrnb/interf_enc.h>
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static const char nb_bitrate_unsupported[] =
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"bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
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typedef struct AMR_bitrates {
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int rate;
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enum Mode mode;
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} AMR_bitrates;
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/* Match desired bitrate */
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static int getBitrateMode(int bitrate)
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{
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/* make the correspondance between bitrate and mode */
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AMR_bitrates rates[] = { { 4750, MR475},
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{ 5150, MR515},
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{ 5900, MR59},
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{ 6700, MR67},
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{ 7400, MR74},
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{ 7950, MR795},
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{10200, MR102},
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{12200, MR122}, };
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int i;
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for (i = 0; i < 8; i++)
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if (rates[i].rate == bitrate)
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return rates[i].mode;
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/* no bitrate matching, return an error */
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return -1;
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}
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typedef struct AMRContext {
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int frameCount;
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void *decState;
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int *enstate;
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int enc_bitrate;
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} AMRContext;
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static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
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{
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AMRContext *s = avctx->priv_data;
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s->frameCount = 0;
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s->decState = Decoder_Interface_init();
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if (!s->decState) {
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av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
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return -1;
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}
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amr_decode_fix_avctx(avctx);
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if (avctx->channels > 1) {
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av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
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return -1;
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}
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return 0;
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}
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static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
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{
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AMRContext *s = avctx->priv_data;
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Decoder_Interface_exit(s->decState);
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return 0;
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}
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static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AMRContext *s = avctx->priv_data;
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const uint8_t *amrData = buf;
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static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
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enum Mode dec_mode;
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int packet_size;
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/* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
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buf, buf_size, s->frameCount); */
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dec_mode = (buf[0] >> 3) & 0x000F;
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packet_size = block_size[dec_mode] + 1;
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if (packet_size > buf_size) {
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av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
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buf_size, packet_size);
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return -1;
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}
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s->frameCount++;
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/* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
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packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
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/* call decoder */
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Decoder_Interface_Decode(s->decState, amrData, data, 0);
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*data_size = 160 * 2;
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return packet_size;
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}
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AVCodec libamr_nb_decoder = {
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"libamr_nb",
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CODEC_TYPE_AUDIO,
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CODEC_ID_AMR_NB,
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sizeof(AMRContext),
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amr_nb_decode_init,
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NULL,
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amr_nb_decode_close,
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amr_nb_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
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};
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static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
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{
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AMRContext *s = avctx->priv_data;
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s->frameCount = 0;
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if (avctx->sample_rate != 8000) {
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av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
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return -1;
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}
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if (avctx->channels != 1) {
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av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
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return -1;
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}
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avctx->frame_size = 160;
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avctx->coded_frame = avcodec_alloc_frame();
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s->enstate=Encoder_Interface_init(0);
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if (!s->enstate) {
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av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
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return -1;
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}
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if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
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av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
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return -1;
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}
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return 0;
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}
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static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
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{
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AMRContext *s = avctx->priv_data;
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Encoder_Interface_exit(s->enstate);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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static int amr_nb_encode_frame(AVCodecContext *avctx,
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unsigned char *frame/*out*/,
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int buf_size, void *data/*in*/)
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{
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AMRContext *s = avctx->priv_data;
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int written;
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if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
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av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
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return -1;
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}
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written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
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frame, 0);
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/* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
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written, s->enc_bitrate, frame[0] ); */
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return written;
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}
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AVCodec libamr_nb_encoder = {
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"libamr_nb",
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CODEC_TYPE_AUDIO,
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CODEC_ID_AMR_NB,
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sizeof(AMRContext),
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amr_nb_encode_init,
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amr_nb_encode_frame,
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amr_nb_encode_close,
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NULL,
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.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
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.long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
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};
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#endif
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/* -----------AMR wideband ------------*/
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#if CONFIG_LIBAMR_WB
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#ifdef _TYPEDEF_H
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//To avoid duplicate typedefs from typedef in amr-nb
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#define typedef_h
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#endif
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#include <amrwb/dec_if.h>
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#include <amrwb/if_rom.h>
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static const char wb_bitrate_unsupported[] =
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"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";
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typedef struct AMRWB_bitrates {
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int rate;
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int mode;
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} AMRWB_bitrates;
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typedef struct AMRWBContext {
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int frameCount;
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void *state;
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int mode;
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Word16 allow_dtx;
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} AMRWBContext;
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#if CONFIG_LIBAMR_WB_ENCODER
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#include <amrwb/enc_if.h>
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static int getWBBitrateMode(int bitrate)
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{
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/* make the correspondance between bitrate and mode */
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AMRWB_bitrates rates[] = { { 6600, 0},
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{ 8850, 1},
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{12650, 2},
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{14250, 3},
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{15850, 4},
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{18250, 5},
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{19850, 6},
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{23050, 7},
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{23850, 8}, };
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int i;
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for (i = 0; i < 9; i++)
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if (rates[i].rate == bitrate)
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return rates[i].mode;
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/* no bitrate matching, return an error */
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return -1;
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}
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static av_cold int amr_wb_encode_init(AVCodecContext *avctx)
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{
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AMRWBContext *s = avctx->priv_data;
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s->frameCount = 0;
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if (avctx->sample_rate != 16000) {
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av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
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return -1;
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}
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if (avctx->channels != 1) {
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av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
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return -1;
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}
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if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) {
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av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
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return -1;
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}
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avctx->frame_size = 320;
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avctx->coded_frame = avcodec_alloc_frame();
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s->state = E_IF_init();
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s->allow_dtx = 0;
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return 0;
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}
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static int amr_wb_encode_close(AVCodecContext *avctx)
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{
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AMRWBContext *s = avctx->priv_data;
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E_IF_exit(s->state);
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av_freep(&avctx->coded_frame);
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s->frameCount++;
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return 0;
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}
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static int amr_wb_encode_frame(AVCodecContext *avctx,
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unsigned char *frame/*out*/,
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int buf_size, void *data/*in*/)
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{
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AMRWBContext *s = avctx->priv_data;
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int size;
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if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) {
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av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
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return -1;
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}
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size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx);
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return size;
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}
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AVCodec libamr_wb_encoder = {
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"libamr_wb",
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CODEC_TYPE_AUDIO,
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CODEC_ID_AMR_WB,
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sizeof(AMRWBContext),
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amr_wb_encode_init,
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amr_wb_encode_frame,
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amr_wb_encode_close,
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NULL,
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.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
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.long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
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};
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#endif
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static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
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{
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AMRWBContext *s = avctx->priv_data;
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s->frameCount = 0;
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s->state = D_IF_init();
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amr_decode_fix_avctx(avctx);
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if (avctx->channels > 1) {
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av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
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return -1;
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}
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return 0;
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}
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static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AMRWBContext *s = avctx->priv_data;
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const uint8_t *amrData = buf;
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int mode;
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int packet_size;
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static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
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if (!buf_size)
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/* nothing to do */
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return 0;
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mode = (amrData[0] >> 3) & 0x000F;
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packet_size = block_size[mode];
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if (packet_size > buf_size) {
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av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
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buf_size, packet_size + 1);
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return -1;
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}
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s->frameCount++;
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D_IF_decode(s->state, amrData, data, _good_frame);
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*data_size = 320 * 2;
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return packet_size;
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}
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static int amr_wb_decode_close(AVCodecContext *avctx)
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{
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AMRWBContext *s = avctx->priv_data;
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D_IF_exit(s->state);
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return 0;
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}
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AVCodec libamr_wb_decoder = {
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"libamr_wb",
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CODEC_TYPE_AUDIO,
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CODEC_ID_AMR_WB,
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sizeof(AMRWBContext),
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amr_wb_decode_init,
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NULL,
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amr_wb_decode_close,
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amr_wb_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
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};
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#endif //CONFIG_LIBAMR_WB
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