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ffmpeg/libavcodec/libfdk-aacdec.c
Omer Osman 1e9a93bfca libfdk-aacdec: Decode the first AAC frame to reliably identify the bitstream 
For implicit signaling cases (as possible for Spectral Band Replication
and Parametric Stereo Tools), the decoder must decode the first frame to
correctly identify the stream configuration (as called from
avformat_find_stream_info). The mechanism for this is built-in and only
requires adding CODEC_CAP_CHANNEL_CONF to the libfdk-aacdec AVCodec
struct.

Signed-off-by: Omer Osman <omer.osman@iis.fraunhofer.de>
Signed-off-by: Martin Storsjö <martin@martin.st>
2014-07-07 22:09:15 +03:00

304 lines
9.9 KiB
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/*
* AAC decoder wrapper
* Copyright (c) 2012 Martin Storsjo
*
* This file is part of Libav.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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_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_NOISE_SUBSTITUTION }, CONCEAL_METHOD_SPECTRAL_MUTING, CONCEAL_METHOD_NB - 1, 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 ((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 | CODEC_CAP_CHANNEL_CONF,
.priv_class = &fdk_aac_dec_class,
};
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