-/*
- * AMR Audio decoder stub
- * Copyright (c) 2003 the ffmpeg project
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- /** @file
- * Adaptive Multi-Rate (AMR) Audio decoder stub.
- *
- * This code implements both an AMR-NarrowBand (AMR-NB) and an AMR-WideBand
- * (AMR-WB) audio encoder/decoder through external reference code from
- * http://www.3gpp.org/. The license of the code from 3gpp is unclear so you
- * have to download the code separately.
- *
- * \section AMR-NB
- *
- * The float version (default) can be downloaded from:
- * http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-610.zip
- *
- * \subsection Specification
- * The specification for AMR-NB can be found in TS 26.071
- * (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
- * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
- *
- * \section AMR-WB
- *
- * The reference code can be downloaded from:
- * http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-600.zip
- *
- * \subsection Specification
- * The specification for AMR-WB can be found in TS 26.171
- * (http://www.3gpp.org/ftp/Specs/html-info/26171.htm) and some other
- * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
- *
- */
-
-#include "avcodec.h"
-
-static void amr_decode_fix_avctx(AVCodecContext *avctx)
-{
- const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
-
- if (!avctx->sample_rate)
- avctx->sample_rate = 8000 * is_amr_wb;
-
- if (!avctx->channels)
- avctx->channels = 1;
-
- avctx->frame_size = 160 * is_amr_wb;
- avctx->sample_fmt = SAMPLE_FMT_S16;
-}
-
-#if CONFIG_LIBAMR_NB
-
-#include <amrnb/interf_dec.h>
-#include <amrnb/interf_enc.h>
-
-static const char nb_bitrate_unsupported[] =
- "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
-
-typedef struct AMR_bitrates {
- int rate;
- enum Mode mode;
-} AMR_bitrates;
-
-/* Match desired bitrate */
-static int getBitrateMode(int bitrate)
-{
- /* make the correspondance between bitrate and mode */
- AMR_bitrates rates[] = { { 4750, MR475},
- { 5150, MR515},
- { 5900, MR59},
- { 6700, MR67},
- { 7400, MR74},
- { 7950, MR795},
- {10200, MR102},
- {12200, MR122}, };
- int i;
-
- for (i = 0; i < 8; i++)
- if (rates[i].rate == bitrate)
- return rates[i].mode;
- /* no bitrate matching, return an error */
- return -1;
-}
-
-typedef struct AMRContext {
- int frameCount;
- void *decState;
- int *enstate;
- int enc_bitrate;
-} AMRContext;
-
-static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
-{
- AMRContext *s = avctx->priv_data;
-
- s->frameCount = 0;
- s->decState = Decoder_Interface_init();
- if (!s->decState) {
- av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
- return -1;
- }
-
- amr_decode_fix_avctx(avctx);
-
- if (avctx->channels > 1) {
- av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
- return -1;
- }
-
- return 0;
-}
-
-static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
-{
- AMRContext *s = avctx->priv_data;
-
- Decoder_Interface_exit(s->decState);
- return 0;
-}
-
-static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
- int *data_size, AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- AMRContext *s = avctx->priv_data;
- const uint8_t *amrData = buf;
- static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
- enum Mode dec_mode;
- int packet_size;
-
- /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
- buf, buf_size, s->frameCount); */
-
- dec_mode = (buf[0] >> 3) & 0x000F;
- packet_size = block_size[dec_mode] + 1;
-
- if (packet_size > buf_size) {
- av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
- buf_size, packet_size);
- return -1;
- }
-
- s->frameCount++;
- /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
- packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
- /* call decoder */
- Decoder_Interface_Decode(s->decState, amrData, data, 0);
- *data_size = 160 * 2;
-
- return packet_size;
-}
-
-AVCodec libamr_nb_decoder = {
- "libamr_nb",
- CODEC_TYPE_AUDIO,
- CODEC_ID_AMR_NB,
- sizeof(AMRContext),
- amr_nb_decode_init,
- NULL,
- amr_nb_decode_close,
- amr_nb_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
-};
-
-static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
-{
- AMRContext *s = avctx->priv_data;
-
- s->frameCount = 0;
-
- if (avctx->sample_rate != 8000) {
- av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
- return -1;
- }
-
- if (avctx->channels != 1) {
- av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
- return -1;
- }
-
- avctx->frame_size = 160;
- avctx->coded_frame = avcodec_alloc_frame();
-
- s->enstate=Encoder_Interface_init(0);
- if (!s->enstate) {
- av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
- return -1;
- }
-
- if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
- av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
- return -1;
- }
-
- return 0;
-}
-
-static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
-{
- AMRContext *s = avctx->priv_data;
-
- Encoder_Interface_exit(s->enstate);
- av_freep(&avctx->coded_frame);
- return 0;
-}
-
-static int amr_nb_encode_frame(AVCodecContext *avctx,
- unsigned char *frame/*out*/,
- int buf_size, void *data/*in*/)
-{
- AMRContext *s = avctx->priv_data;
- int written;
-
- if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
- av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
- return -1;
- }
-
- written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
- frame, 0);
- /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
- written, s->enc_bitrate, frame[0] ); */
-
- return written;
-}
-
-AVCodec libamr_nb_encoder = {
- "libamr_nb",
- CODEC_TYPE_AUDIO,
- CODEC_ID_AMR_NB,
- sizeof(AMRContext),
- amr_nb_encode_init,
- amr_nb_encode_frame,
- amr_nb_encode_close,
- NULL,
- .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
- .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
-};
-
-#endif
-
-/* -----------AMR wideband ------------*/
-#if CONFIG_LIBAMR_WB
-
-#ifdef _TYPEDEF_H
-//To avoid duplicate typedefs from typedef in amr-nb
-#define typedef_h
-#endif
-
-#include <amrwb/dec_if.h>
-#include <amrwb/if_rom.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 {
- int frameCount;
- void *state;
- int mode;
- Word16 allow_dtx;
-} AMRWBContext;
-
-#if CONFIG_LIBAMR_WB_ENCODER
-
-#include <amrwb/enc_if.h>
-
-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;
-
- s->frameCount = 0;
-
- 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);
- s->frameCount++;
- 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 libamr_wb_encoder = {
- "libamr_wb",
- 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("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
-};
-
-#endif
-
-static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
-{
- AMRWBContext *s = avctx->priv_data;
-
- s->frameCount = 0;
- s->state = D_IF_init();
-
- amr_decode_fix_avctx(avctx);
-
- if (avctx->channels > 1) {
- av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
- return -1;
- }
-
- return 0;
-}
-
-static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
- int *data_size, AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- AMRWBContext *s = avctx->priv_data;
- const uint8_t *amrData = buf;
- int mode;
- int packet_size;
- static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
-
- if (!buf_size)
- /* nothing to do */
- return 0;
-
- mode = (amrData[0] >> 3) & 0x000F;
- packet_size = block_size[mode];
-
- if (packet_size > buf_size) {
- av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
- buf_size, packet_size + 1);
- return -1;
- }
-
- s->frameCount++;
- D_IF_decode(s->state, amrData, data, _good_frame);
- *data_size = 320 * 2;
- return packet_size;
-}
-
-static int amr_wb_decode_close(AVCodecContext *avctx)
-{
- AMRWBContext *s = avctx->priv_data;
-
- D_IF_exit(s->state);
- return 0;
-}
-
-AVCodec libamr_wb_decoder = {
- "libamr_wb",
- CODEC_TYPE_AUDIO,
- CODEC_ID_AMR_WB,
- sizeof(AMRWBContext),
- amr_wb_decode_init,
- NULL,
- amr_wb_decode_close,
- amr_wb_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
-};
-
-#endif //CONFIG_LIBAMR_WB