yading@10: /*
yading@10:  * AMR Audio decoder stub
yading@10:  * Copyright (c) 2003 the ffmpeg project
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "avcodec.h"
yading@10: #include "audio_frame_queue.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: static int amr_decode_fix_avctx(AVCodecContext *avctx)
yading@10: {
yading@10:     const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
yading@10: 
yading@10:     if (!avctx->sample_rate)
yading@10:         avctx->sample_rate = 8000 * is_amr_wb;
yading@10: 
yading@10:     if (avctx->channels > 1) {
yading@10:         avpriv_report_missing_feature(avctx, "multi-channel AMR");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     avctx->channels       = 1;
yading@10:     avctx->channel_layout = AV_CH_LAYOUT_MONO;
yading@10:     avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #if CONFIG_LIBOPENCORE_AMRNB
yading@10: 
yading@10: #include <opencore-amrnb/interf_dec.h>
yading@10: #include <opencore-amrnb/interf_enc.h>
yading@10: 
yading@10: typedef struct AMRContext {
yading@10:     AVClass *av_class;
yading@10:     void *dec_state;
yading@10:     void *enc_state;
yading@10:     int   enc_bitrate;
yading@10:     int   enc_mode;
yading@10:     int   enc_dtx;
yading@10:     int   enc_last_frame;
yading@10:     AudioFrameQueue afq;
yading@10: } AMRContext;
yading@10: 
yading@10: #if CONFIG_LIBOPENCORE_AMRNB_DECODER
yading@10: static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     AMRContext *s  = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = amr_decode_fix_avctx(avctx)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     s->dec_state   = Decoder_Interface_init();
yading@10:     if (!s->dec_state) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     AMRContext *s = avctx->priv_data;
yading@10: 
yading@10:     Decoder_Interface_exit(s->dec_state);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                                int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame     = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     AMRContext *s      = avctx->priv_data;
yading@10:     static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
yading@10:     enum Mode dec_mode;
yading@10:     int packet_size, ret;
yading@10: 
yading@10:     av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
yading@10:             buf, buf_size, avctx->frame_number);
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = 160;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     dec_mode    = (buf[0] >> 3) & 0x000F;
yading@10:     packet_size = block_size[dec_mode] + 1;
yading@10: 
yading@10:     if (packet_size > buf_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
yading@10:                buf_size, packet_size);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
yading@10:               packet_size, buf[0], buf[1], buf[2], buf[3]);
yading@10:     /* call decoder */
yading@10:     Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return packet_size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_libopencore_amrnb_decoder = {
yading@10:     .name           = "libopencore_amrnb",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_AMR_NB,
yading@10:     .priv_data_size = sizeof(AMRContext),
yading@10:     .init           = amr_nb_decode_init,
yading@10:     .close          = amr_nb_decode_close,
yading@10:     .decode         = amr_nb_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
yading@10: };
yading@10: #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
yading@10: 
yading@10: #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
yading@10: /* Common code for fixed and float version*/
yading@10: typedef struct AMR_bitrates {
yading@10:     int       rate;
yading@10:     enum Mode mode;
yading@10: } AMR_bitrates;
yading@10: 
yading@10: /* Match desired bitrate */
yading@10: static int get_bitrate_mode(int bitrate, void *log_ctx)
yading@10: {
yading@10:     /* make the correspondance between bitrate and mode */
yading@10:     static const AMR_bitrates rates[] = {
yading@10:         { 4750, MR475 }, { 5150, MR515 }, {  5900, MR59  }, {  6700, MR67  },
yading@10:         { 7400, MR74 },  { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
yading@10:     };
yading@10:     int i, best = -1, min_diff = 0;
yading@10:     char log_buf[200];
yading@10: 
yading@10:     for (i = 0; i < 8; i++) {
yading@10:         if (rates[i].rate == bitrate)
yading@10:             return rates[i].mode;
yading@10:         if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
yading@10:             best     = i;
yading@10:             min_diff = abs(rates[i].rate - bitrate);
yading@10:         }
yading@10:     }
yading@10:     /* no bitrate matching exactly, log a warning */
yading@10:     snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
yading@10:     for (i = 0; i < 8; i++)
yading@10:         av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate    / 1000.f);
yading@10:     av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
yading@10:     av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
yading@10: 
yading@10:     return best;
yading@10: }
yading@10: 
yading@10: static const AVOption options[] = {
yading@10:     { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVClass class = {
yading@10:     "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
yading@10: };
yading@10: 
yading@10: static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     AMRContext *s = avctx->priv_data;
yading@10: 
yading@10:     if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
yading@10:         return AVERROR(ENOSYS);
yading@10:     }
yading@10: 
yading@10:     if (avctx->channels != 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
yading@10:         return AVERROR(ENOSYS);
yading@10:     }
yading@10: 
yading@10:     avctx->frame_size  = 160;
yading@10:     avctx->delay       =  50;
yading@10:     ff_af_queue_init(avctx, &s->afq);
yading@10: 
yading@10:     s->enc_state = Encoder_Interface_init(s->enc_dtx);
yading@10:     if (!s->enc_state) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
yading@10:         av_freep(&avctx->coded_frame);
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
yading@10:     s->enc_bitrate = avctx->bit_rate;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     AMRContext *s = avctx->priv_data;
yading@10: 
yading@10:     Encoder_Interface_exit(s->enc_state);
yading@10:     ff_af_queue_close(&s->afq);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
yading@10:                                const AVFrame *frame, int *got_packet_ptr)
yading@10: {
yading@10:     AMRContext *s = avctx->priv_data;
yading@10:     int written, ret;
yading@10:     int16_t *flush_buf = NULL;
yading@10:     const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
yading@10: 
yading@10:     if (s->enc_bitrate != avctx->bit_rate) {
yading@10:         s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
yading@10:         s->enc_bitrate = avctx->bit_rate;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, avpkt, 32)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (frame) {
yading@10:         if (frame->nb_samples < avctx->frame_size) {
yading@10:             flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
yading@10:             if (!flush_buf)
yading@10:                 return AVERROR(ENOMEM);
yading@10:             memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
yading@10:             samples = flush_buf;
yading@10:             if (frame->nb_samples < avctx->frame_size - avctx->delay)
yading@10:                 s->enc_last_frame = -1;
yading@10:         }
yading@10:         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
yading@10:             av_freep(&flush_buf);
yading@10:             return ret;
yading@10:         }
yading@10:     } else {
yading@10:         if (s->enc_last_frame < 0)
yading@10:             return 0;
yading@10:         flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
yading@10:         if (!flush_buf)
yading@10:             return AVERROR(ENOMEM);
yading@10:         samples = flush_buf;
yading@10:         s->enc_last_frame = -1;
yading@10:     }
yading@10: 
yading@10:     written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
yading@10:                                        avpkt->data, 0);
yading@10:     av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
yading@10:             written, s->enc_mode, avpkt->data[0]);
yading@10: 
yading@10:     /* Get the next frame pts/duration */
yading@10:     ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
yading@10:                        &avpkt->duration);
yading@10: 
yading@10:     avpkt->size = written;
yading@10:     *got_packet_ptr = 1;
yading@10:     av_freep(&flush_buf);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_libopencore_amrnb_encoder = {
yading@10:     .name           = "libopencore_amrnb",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_AMR_NB,
yading@10:     .priv_data_size = sizeof(AMRContext),
yading@10:     .init           = amr_nb_encode_init,
yading@10:     .encode2        = amr_nb_encode_frame,
yading@10:     .close          = amr_nb_encode_close,
yading@10:     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
yading@10:     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
yading@10:                                                      AV_SAMPLE_FMT_NONE },
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
yading@10:     .priv_class     = &class,
yading@10: };
yading@10: #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
yading@10: 
yading@10: #endif /* CONFIG_LIBOPENCORE_AMRNB */
yading@10: 
yading@10: /* -----------AMR wideband ------------*/
yading@10: #if CONFIG_LIBOPENCORE_AMRWB_DECODER
yading@10: 
yading@10: #include <opencore-amrwb/dec_if.h>
yading@10: #include <opencore-amrwb/if_rom.h>
yading@10: 
yading@10: typedef struct AMRWBContext {
yading@10:     void  *state;
yading@10: } AMRWBContext;
yading@10: 
yading@10: static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     AMRWBContext *s = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = amr_decode_fix_avctx(avctx)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     s->state        = D_IF_init();
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                                int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame     = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     AMRWBContext *s    = avctx->priv_data;
yading@10:     int mode, ret;
yading@10:     int packet_size;
yading@10:     static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = 320;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     mode        = (buf[0] >> 3) & 0x000F;
yading@10:     packet_size = block_size[mode];
yading@10: 
yading@10:     if (packet_size > buf_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
yading@10:                buf_size, packet_size + 1);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (!packet_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return packet_size;
yading@10: }
yading@10: 
yading@10: static int amr_wb_decode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     AMRWBContext *s = avctx->priv_data;
yading@10: 
yading@10:     D_IF_exit(s->state);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_libopencore_amrwb_decoder = {
yading@10:     .name           = "libopencore_amrwb",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_AMR_WB,
yading@10:     .priv_data_size = sizeof(AMRWBContext),
yading@10:     .init           = amr_wb_decode_init,
yading@10:     .close          = amr_wb_decode_close,
yading@10:     .decode         = amr_wb_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
yading@10: };
yading@10: 
yading@10: #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */