diff options
Diffstat (limited to 'ffmpeg/libavcodec/libopencore-amr.c')
| -rw-r--r-- | ffmpeg/libavcodec/libopencore-amr.c | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/libopencore-amr.c b/ffmpeg/libavcodec/libopencore-amr.c new file mode 100644 index 0000000..c991106 --- /dev/null +++ b/ffmpeg/libavcodec/libopencore-amr.c @@ -0,0 +1,379 @@ +/* + * 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 + */ + +#include "libavutil/avstring.h" +#include "libavutil/channel_layout.h" +#include "libavutil/common.h" +#include "libavutil/opt.h" +#include "avcodec.h" +#include "audio_frame_queue.h" +#include "internal.h" + +static int amr_decode_fix_avctx(AVCodecContext *avctx) +{ + const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB); + + if (!avctx->sample_rate) + avctx->sample_rate = 8000 * is_amr_wb; + + if (avctx->channels > 1) { + avpriv_report_missing_feature(avctx, "multi-channel AMR"); + return AVERROR_PATCHWELCOME; + } + + avctx->channels = 1; + avctx->channel_layout = AV_CH_LAYOUT_MONO; + avctx->sample_fmt = AV_SAMPLE_FMT_S16; + return 0; +} + +#if CONFIG_LIBOPENCORE_AMRNB + +#include <opencore-amrnb/interf_dec.h> +#include <opencore-amrnb/interf_enc.h> + +typedef struct AMRContext { + AVClass *av_class; + void *dec_state; + void *enc_state; + int enc_bitrate; + int enc_mode; + int enc_dtx; + int enc_last_frame; + AudioFrameQueue afq; +} AMRContext; + +#if CONFIG_LIBOPENCORE_AMRNB_DECODER +static av_cold int amr_nb_decode_init(AVCodecContext *avctx) +{ + AMRContext *s = avctx->priv_data; + int ret; + + if ((ret = amr_decode_fix_avctx(avctx)) < 0) + return ret; + + s->dec_state = Decoder_Interface_init(); + if (!s->dec_state) { + av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n"); + return -1; + } + + return 0; +} + +static av_cold int amr_nb_decode_close(AVCodecContext *avctx) +{ + AMRContext *s = avctx->priv_data; + + Decoder_Interface_exit(s->dec_state); + + return 0; +} + +static int amr_nb_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame_ptr, AVPacket *avpkt) +{ + AVFrame *frame = data; + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + AMRContext *s = avctx->priv_data; + 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, ret; + + av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n", + buf, buf_size, avctx->frame_number); + + /* get output buffer */ + frame->nb_samples = 160; + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + 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 AVERROR_INVALIDDATA; + } + + av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n", + packet_size, buf[0], buf[1], buf[2], buf[3]); + /* call decoder */ + Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0); + + *got_frame_ptr = 1; + + return packet_size; +} + +AVCodec ff_libopencore_amrnb_decoder = { + .name = "libopencore_amrnb", + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_AMR_NB, + .priv_data_size = sizeof(AMRContext), + .init = amr_nb_decode_init, + .close = amr_nb_decode_close, + .decode = amr_nb_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"), +}; +#endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */ + +#if CONFIG_LIBOPENCORE_AMRNB_ENCODER +/* Common code for fixed and float version*/ +typedef struct AMR_bitrates { + int rate; + enum Mode mode; +} AMR_bitrates; + +/* Match desired bitrate */ +static int get_bitrate_mode(int bitrate, void *log_ctx) +{ + /* make the correspondance between bitrate and mode */ + static const AMR_bitrates rates[] = { + { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 }, + { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 } + }; + int i, best = -1, min_diff = 0; + char log_buf[200]; + + for (i = 0; i < 8; i++) { + if (rates[i].rate == bitrate) + return rates[i].mode; + if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) { + best = i; + min_diff = abs(rates[i].rate - bitrate); + } + } + /* no bitrate matching exactly, log a warning */ + snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of "); + for (i = 0; i < 8; i++) + av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f); + av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f); + av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf); + + return best; +} + +static const AVOption options[] = { + { "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 }, + { NULL } +}; + +static const AVClass class = { + "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT +}; + +static av_cold int amr_nb_encode_init(AVCodecContext *avctx) +{ + AMRContext *s = avctx->priv_data; + + if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) { + av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); + return AVERROR(ENOSYS); + } + + if (avctx->channels != 1) { + av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); + return AVERROR(ENOSYS); + } + + avctx->frame_size = 160; + avctx->delay = 50; + ff_af_queue_init(avctx, &s->afq); + + s->enc_state = Encoder_Interface_init(s->enc_dtx); + if (!s->enc_state) { + av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n"); + av_freep(&avctx->coded_frame); + return -1; + } + + s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); + s->enc_bitrate = avctx->bit_rate; + + return 0; +} + +static av_cold int amr_nb_encode_close(AVCodecContext *avctx) +{ + AMRContext *s = avctx->priv_data; + + Encoder_Interface_exit(s->enc_state); + ff_af_queue_close(&s->afq); + return 0; +} + +static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, + const AVFrame *frame, int *got_packet_ptr) +{ + AMRContext *s = avctx->priv_data; + int written, ret; + int16_t *flush_buf = NULL; + const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL; + + if (s->enc_bitrate != avctx->bit_rate) { + s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); + s->enc_bitrate = avctx->bit_rate; + } + + if ((ret = ff_alloc_packet2(avctx, avpkt, 32)) < 0) + return ret; + + if (frame) { + if (frame->nb_samples < avctx->frame_size) { + flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf)); + if (!flush_buf) + return AVERROR(ENOMEM); + memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf)); + samples = flush_buf; + if (frame->nb_samples < avctx->frame_size - avctx->delay) + s->enc_last_frame = -1; + } + if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) { + av_freep(&flush_buf); + return ret; + } + } else { + if (s->enc_last_frame < 0) + return 0; + flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf)); + if (!flush_buf) + return AVERROR(ENOMEM); + samples = flush_buf; + s->enc_last_frame = -1; + } + + written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples, + avpkt->data, 0); + av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n", + written, s->enc_mode, avpkt->data[0]); + + /* Get the next frame pts/duration */ + ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, + &avpkt->duration); + + avpkt->size = written; + *got_packet_ptr = 1; + av_freep(&flush_buf); + return 0; +} + +AVCodec ff_libopencore_amrnb_encoder = { + .name = "libopencore_amrnb", + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_AMR_NB, + .priv_data_size = sizeof(AMRContext), + .init = amr_nb_encode_init, + .encode2 = amr_nb_encode_frame, + .close = amr_nb_encode_close, + .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME, + .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, + AV_SAMPLE_FMT_NONE }, + .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"), + .priv_class = &class, +}; +#endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */ + +#endif /* CONFIG_LIBOPENCORE_AMRNB */ + +/* -----------AMR wideband ------------*/ +#if CONFIG_LIBOPENCORE_AMRWB_DECODER + +#include <opencore-amrwb/dec_if.h> +#include <opencore-amrwb/if_rom.h> + +typedef struct AMRWBContext { + void *state; +} AMRWBContext; + +static av_cold int amr_wb_decode_init(AVCodecContext *avctx) +{ + AMRWBContext *s = avctx->priv_data; + int ret; + + if ((ret = amr_decode_fix_avctx(avctx)) < 0) + return ret; + + s->state = D_IF_init(); + + return 0; +} + +static int amr_wb_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame_ptr, AVPacket *avpkt) +{ + AVFrame *frame = data; + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + AMRWBContext *s = avctx->priv_data; + int mode, ret; + 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}; + + /* get output buffer */ + frame->nb_samples = 320; + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + mode = (buf[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 AVERROR_INVALIDDATA; + } + if (!packet_size) { + av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n"); + return AVERROR_INVALIDDATA; + } + + D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame); + + *got_frame_ptr = 1; + + return packet_size; +} + +static int amr_wb_decode_close(AVCodecContext *avctx) +{ + AMRWBContext *s = avctx->priv_data; + + D_IF_exit(s->state); + return 0; +} + +AVCodec ff_libopencore_amrwb_decoder = { + .name = "libopencore_amrwb", + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_AMR_WB, + .priv_data_size = sizeof(AMRWBContext), + .init = amr_wb_decode_init, + .close = amr_wb_decode_close, + .decode = amr_wb_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"), +}; + +#endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */ |