Add a libfdk-aac decoder

This can be useful for decoding AAC object types that are not supported
by the native AAC decoder, e.g. AAC-LD and AAC-ELD.

1 files changed, 299 insertions, 0 deletions

diff --git a/libavcodec/libfdk-aacdec.c b/libavcodec/libfdk-aacdec.c
new file mode 100644
index 0000000000..201286f2d8
--- /dev/null
+++ b/libavcodec/libfdk-aacdec.c
@@ -0,0 +1,299 @@
+/*
+ * AAC decoder wrapper
+ * Copyright (c) 2012 Martin Storsjo
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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) {
+            av_log(avctx, AV_LOG_ERROR, "ff_get_buffer() failed\n");
+            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) {
+            av_log(avctx, AV_LOG_ERROR, "ff_get_buffer() failed\n");
+            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,
+};