/* * AAC decoder wrapper * Copyright (c) 2012 Martin Storsjo * * 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 <fdk-aac/aacdecoder_lib.h> #include "libavutil/channel_layout.h" #include "libavutil/common.h" #include "libavutil/opt.h" #include "avcodec.h" #include "internal.h" enum ConcealMethod { CONCEAL_METHOD_DEFAULT = -1, CONCEAL_METHOD_SPECTRAL_MUTING = 0, CONCEAL_METHOD_NOISE_SUBSTITUTION = 1, CONCEAL_METHOD_ENERGY_INTERPOLATION = 2, CONCEAL_METHOD_NB, }; typedef struct FDKAACDecContext { const AVClass *class; HANDLE_AACDECODER handle; int initialized; enum ConcealMethod conceal_method; } FDKAACDecContext; #define OFFSET(x) offsetof(FDKAACDecContext, x) #define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM static const AVOption fdk_aac_dec_options[] = { { "conceal", "Error concealment method", OFFSET(conceal_method), AV_OPT_TYPE_INT, { .i64 = CONCEAL_METHOD_DEFAULT }, CONCEAL_METHOD_DEFAULT, CONCEAL_METHOD_NB - 1, AD, "conceal" }, { "default", "Default", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_DEFAULT }, INT_MIN, INT_MAX, AD, "conceal" }, { "spectral", "Spectral muting", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_SPECTRAL_MUTING }, INT_MIN, INT_MAX, AD, "conceal" }, { "noise", "Noise Substitution", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_NOISE_SUBSTITUTION }, INT_MIN, INT_MAX, AD, "conceal" }, { "energy", "Energy Interpolation", 0, AV_OPT_TYPE_CONST, { .i64 = CONCEAL_METHOD_ENERGY_INTERPOLATION }, INT_MIN, INT_MAX, AD, "conceal" }, { NULL } }; static const AVClass fdk_aac_dec_class = { "libfdk-aac decoder", av_default_item_name, fdk_aac_dec_options, LIBAVUTIL_VERSION_INT }; static int get_stream_info(AVCodecContext *avctx) { FDKAACDecContext *s = avctx->priv_data; CStreamInfo *info = aacDecoder_GetStreamInfo(s->handle); int channel_counts[9] = { 0 }; int i, ch_error = 0; uint64_t ch_layout = 0; if (!info) { av_log(avctx, AV_LOG_ERROR, "Unable to get stream info\n"); return AVERROR_UNKNOWN; } if (info->sampleRate <= 0) { av_log(avctx, AV_LOG_ERROR, "Stream info not initialized\n"); return AVERROR_UNKNOWN; } avctx->sample_rate = info->sampleRate; avctx->frame_size = info->frameSize; for (i = 0; i < info->numChannels; i++) { AUDIO_CHANNEL_TYPE ctype = info->pChannelType[i]; if (ctype <= ACT_NONE || ctype > ACT_TOP) { av_log(avctx, AV_LOG_WARNING, "unknown channel type\n"); break; } channel_counts[ctype]++; } av_log(avctx, AV_LOG_DEBUG, "%d channels - front:%d side:%d back:%d lfe:%d top:%d\n", info->numChannels, channel_counts[ACT_FRONT], channel_counts[ACT_SIDE], channel_counts[ACT_BACK], channel_counts[ACT_LFE], channel_counts[ACT_FRONT_TOP] + channel_counts[ACT_SIDE_TOP] + channel_counts[ACT_BACK_TOP] + channel_counts[ACT_TOP]); switch (channel_counts[ACT_FRONT]) { case 4: ch_layout |= AV_CH_LAYOUT_STEREO | AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER; break; case 3: ch_layout |= AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER; break; case 2: ch_layout |= AV_CH_LAYOUT_STEREO; break; case 1: ch_layout |= AV_CH_FRONT_CENTER; break; default: av_log(avctx, AV_LOG_WARNING, "unsupported number of front channels: %d\n", channel_counts[ACT_FRONT]); ch_error = 1; break; } if (channel_counts[ACT_SIDE] > 0) { if (channel_counts[ACT_SIDE] == 2) { ch_layout |= AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT; } else { av_log(avctx, AV_LOG_WARNING, "unsupported number of side channels: %d\n", channel_counts[ACT_SIDE]); ch_error = 1; } } if (channel_counts[ACT_BACK] > 0) { switch (channel_counts[ACT_BACK]) { case 3: ch_layout |= AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT | AV_CH_BACK_CENTER; break; case 2: ch_layout |= AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT; break; case 1: ch_layout |= AV_CH_BACK_CENTER; break; default: av_log(avctx, AV_LOG_WARNING, "unsupported number of back channels: %d\n", channel_counts[ACT_BACK]); ch_error = 1; break; } } if (channel_counts[ACT_LFE] > 0) { if (channel_counts[ACT_LFE] == 1) { ch_layout |= AV_CH_LOW_FREQUENCY; } else { av_log(avctx, AV_LOG_WARNING, "unsupported number of LFE channels: %d\n", channel_counts[ACT_LFE]); ch_error = 1; } } if (!ch_error && av_get_channel_layout_nb_channels(ch_layout) != info->numChannels) { av_log(avctx, AV_LOG_WARNING, "unsupported channel configuration\n"); ch_error = 1; } if (ch_error) avctx->channel_layout = 0; else avctx->channel_layout = ch_layout; avctx->channels = info->numChannels; return 0; } static av_cold int fdk_aac_decode_close(AVCodecContext *avctx) { FDKAACDecContext *s = avctx->priv_data; if (s->handle) aacDecoder_Close(s->handle); return 0; } static av_cold int fdk_aac_decode_init(AVCodecContext *avctx) { FDKAACDecContext *s = avctx->priv_data; AAC_DECODER_ERROR err; s->handle = aacDecoder_Open(avctx->extradata_size ? TT_MP4_RAW : TT_MP4_ADTS, 1); if (!s->handle) { av_log(avctx, AV_LOG_ERROR, "Error opening decoder\n"); return AVERROR_UNKNOWN; } if (avctx->extradata_size) { if ((err = aacDecoder_ConfigRaw(s->handle, &avctx->extradata, &avctx->extradata_size)) != AAC_DEC_OK) { av_log(avctx, AV_LOG_ERROR, "Unable to set extradata\n"); return AVERROR_INVALIDDATA; } } if (s->conceal_method != CONCEAL_METHOD_DEFAULT) { if ((err = aacDecoder_SetParam(s->handle, AAC_CONCEAL_METHOD, s->conceal_method)) != AAC_DEC_OK) { av_log(avctx, AV_LOG_ERROR, "Unable to set error concealment method\n"); return AVERROR_UNKNOWN; } } avctx->sample_fmt = AV_SAMPLE_FMT_S16; return 0; } static int fdk_aac_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) { FDKAACDecContext *s = avctx->priv_data; AVFrame *frame = data; int ret; AAC_DECODER_ERROR err; UINT valid = avpkt->size; uint8_t *buf, *tmpptr = NULL; int buf_size; err = aacDecoder_Fill(s->handle, &avpkt->data, &avpkt->size, &valid); if (err != AAC_DEC_OK) { av_log(avctx, AV_LOG_ERROR, "aacDecoder_Fill() failed: %x\n", err); return AVERROR_INVALIDDATA; } if (s->initialized) { frame->nb_samples = avctx->frame_size; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; buf = frame->extended_data[0]; buf_size = avctx->channels * frame->nb_samples * av_get_bytes_per_sample(avctx->sample_fmt); } else { buf_size = 50 * 1024; buf = tmpptr = av_malloc(buf_size); if (!buf) return AVERROR(ENOMEM); } err = aacDecoder_DecodeFrame(s->handle, (INT_PCM *) buf, buf_size, 0); if (err == AAC_DEC_NOT_ENOUGH_BITS) { ret = avpkt->size - valid; goto end; } if (err != AAC_DEC_OK) { av_log(avctx, AV_LOG_ERROR, "aacDecoder_DecodeFrame() failed: %x\n", err); ret = AVERROR_UNKNOWN; goto end; } if (!s->initialized) { if ((ret = get_stream_info(avctx)) < 0) goto end; s->initialized = 1; frame->nb_samples = avctx->frame_size; } if (tmpptr) { frame->nb_samples = avctx->frame_size; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) goto end; memcpy(frame->extended_data[0], tmpptr, avctx->channels * avctx->frame_size * av_get_bytes_per_sample(avctx->sample_fmt)); } *got_frame_ptr = 1; ret = avpkt->size - valid; end: av_free(tmpptr); return ret; } static av_cold void fdk_aac_decode_flush(AVCodecContext *avctx) { FDKAACDecContext *s = avctx->priv_data; AAC_DECODER_ERROR err; if (!s->handle) return; if ((err = aacDecoder_SetParam(s->handle, AAC_TPDEC_CLEAR_BUFFER, 1)) != AAC_DEC_OK) av_log(avctx, AV_LOG_WARNING, "failed to clear buffer when flushing\n"); } AVCodec ff_libfdk_aac_decoder = { .name = "libfdk_aac", .long_name = NULL_IF_CONFIG_SMALL("Fraunhofer FDK AAC"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_AAC, .priv_data_size = sizeof(FDKAACDecContext), .init = fdk_aac_decode_init, .decode = fdk_aac_decode_frame, .close = fdk_aac_decode_close, .flush = fdk_aac_decode_flush, .capabilities = CODEC_CAP_DR1, .priv_class = &fdk_aac_dec_class, };