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ffmpeg/libavcodec/libdcadec.c

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/*
* libdcadec decoder wrapper
* Copyright (C) 2015 Hendrik Leppkes
*
* 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 <libdcadec/dca_context.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "dca.h"
#include "dca_syncwords.h"
#include "internal.h"
typedef struct DCADecContext {
struct dcadec_context *ctx;
uint8_t *buffer;
int buffer_size;
int downmix_warned;
} DCADecContext;
static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
DCADecContext *s = avctx->priv_data;
AVFrame *frame = data;
struct dcadec_exss_info *exss;
int ret, i, k;
int **samples, nsamples, channel_mask, sample_rate, bits_per_sample, profile;
uint32_t mrk;
uint8_t *input = avpkt->data;
int input_size = avpkt->size;
/* convert bytestream syntax to RAW BE format if required */
if (input_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Input size too small\n");
return AVERROR_INVALIDDATA;
}
mrk = AV_RB32(input);
if (mrk != DCA_SYNCWORD_CORE_BE && mrk != DCA_SYNCWORD_SUBSTREAM) {
s->buffer = av_fast_realloc(s->buffer, &s->buffer_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!s->buffer)
return AVERROR(ENOMEM);
for (i = 0, ret = AVERROR_INVALIDDATA; i < input_size - 3 && ret < 0; i++)
ret = avpriv_dca_convert_bitstream(input + i, input_size - i, s->buffer, s->buffer_size);
if (ret < 0)
return ret;
input = s->buffer;
input_size = ret;
}
if ((ret = dcadec_context_parse(s->ctx, input, input_size)) < 0) {
av_log(avctx, AV_LOG_ERROR, "dcadec_context_parse() failed: %d (%s)\n", -ret, dcadec_strerror(ret));
return AVERROR_EXTERNAL;
}
if ((ret = dcadec_context_filter(s->ctx, &samples, &nsamples, &channel_mask,
&sample_rate, &bits_per_sample, &profile)) < 0) {
av_log(avctx, AV_LOG_ERROR, "dcadec_context_filter() failed: %d (%s)\n", -ret, dcadec_strerror(ret));
return AVERROR_EXTERNAL;
}
avctx->channels = av_get_channel_layout_nb_channels(channel_mask);
avctx->channel_layout = channel_mask;
avctx->sample_rate = sample_rate;
if (bits_per_sample == 16)
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
else if (bits_per_sample > 16 && bits_per_sample <= 24)
avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
else {
av_log(avctx, AV_LOG_ERROR, "Unsupported number of bits per sample: %d\n",
bits_per_sample);
return AVERROR(ENOSYS);
}
avctx->bits_per_raw_sample = bits_per_sample;
switch (profile) {
case DCADEC_PROFILE_DS:
avctx->profile = FF_PROFILE_DTS;
break;
case DCADEC_PROFILE_DS_96_24:
avctx->profile = FF_PROFILE_DTS_96_24;
break;
case DCADEC_PROFILE_DS_ES:
avctx->profile = FF_PROFILE_DTS_ES;
break;
case DCADEC_PROFILE_HD_HRA:
avctx->profile = FF_PROFILE_DTS_HD_HRA;
break;
case DCADEC_PROFILE_HD_MA:
avctx->profile = FF_PROFILE_DTS_HD_MA;
break;
case DCADEC_PROFILE_EXPRESS:
avctx->profile = FF_PROFILE_DTS_EXPRESS;
break;
case DCADEC_PROFILE_UNKNOWN:
default:
avctx->profile = FF_PROFILE_UNKNOWN;
break;
}
/* bitrate is only meaningful if there are no HD extensions, as they distort the bitrate */
if (profile == DCADEC_PROFILE_DS || profile == DCADEC_PROFILE_DS_96_24 || profile == DCADEC_PROFILE_DS_ES) {
struct dcadec_core_info *info = dcadec_context_get_core_info(s->ctx);
avctx->bit_rate = info->bit_rate;
dcadec_context_free_core_info(info);
} else
avctx->bit_rate = 0;
#if HAVE_STRUCT_DCADEC_EXSS_INFO_MATRIX_ENCODING
if (exss = dcadec_context_get_exss_info(s->ctx)) {
enum AVMatrixEncoding matrix_encoding = AV_MATRIX_ENCODING_NONE;
if (!s->downmix_warned) {
uint64_t layout = avctx->request_channel_layout;
if (((layout == AV_CH_LAYOUT_STEREO_DOWNMIX || layout == AV_CH_LAYOUT_STEREO) && !exss->embedded_stereo) ||
( layout == AV_CH_LAYOUT_5POINT1 && !exss->embedded_6ch))
av_log(avctx, AV_LOG_WARNING, "%s downmix was requested but no custom coefficients are available, "
"this may result in clipping\n",
layout == AV_CH_LAYOUT_5POINT1 ? "5.1" : "Stereo");
s->downmix_warned = 1;
}
switch(exss->matrix_encoding) {
case DCADEC_MATRIX_ENCODING_SURROUND:
matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
break;
case DCADEC_MATRIX_ENCODING_HEADPHONE:
matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
break;
}
dcadec_context_free_exss_info(exss);
if (matrix_encoding != AV_MATRIX_ENCODING_NONE &&
(ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
return ret;
}
#endif
frame->nb_samples = nsamples;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
for (i = 0; i < avctx->channels; i++) {
if (frame->format == AV_SAMPLE_FMT_S16P) {
int16_t *plane = (int16_t *)frame->extended_data[i];
for (k = 0; k < nsamples; k++)
plane[k] = samples[i][k];
} else {
int32_t *plane = (int32_t *)frame->extended_data[i];
int shift = 32 - bits_per_sample;
for (k = 0; k < nsamples; k++)
plane[k] = samples[i][k] << shift;
}
}
*got_frame_ptr = 1;
return avpkt->size;
}
static av_cold void dcadec_flush(AVCodecContext *avctx)
{
DCADecContext *s = avctx->priv_data;
dcadec_context_clear(s->ctx);
}
static av_cold int dcadec_close(AVCodecContext *avctx)
{
DCADecContext *s = avctx->priv_data;
dcadec_context_destroy(s->ctx);
s->ctx = NULL;
av_freep(&s->buffer);
return 0;
}
static av_cold int dcadec_init(AVCodecContext *avctx)
{
DCADecContext *s = avctx->priv_data;
int flags = 0;
/* Affects only lossy DTS profiles. DTS-HD MA is always bitexact */
if (avctx->flags & CODEC_FLAG_BITEXACT)
flags |= DCADEC_FLAG_CORE_BIT_EXACT;
if (avctx->request_channel_layout > 0 && avctx->request_channel_layout != AV_CH_LAYOUT_NATIVE) {
switch (avctx->request_channel_layout) {
case AV_CH_LAYOUT_STEREO:
case AV_CH_LAYOUT_STEREO_DOWNMIX:
/* libdcadec ignores the 2ch flag if used alone when no custom downmix coefficients
are available, silently outputting a 5.1 downmix if possible instead.
Using both the 2ch and 6ch flags together forces a 2ch downmix using default
coefficients in such cases. This matches the behavior of the 6ch flag when used
alone, where a 5.1 downmix is generated if possible, regardless of custom
coefficients being available or not. */
flags |= DCADEC_FLAG_KEEP_DMIX_2CH | DCADEC_FLAG_KEEP_DMIX_6CH;
break;
case AV_CH_LAYOUT_5POINT1:
flags |= DCADEC_FLAG_KEEP_DMIX_6CH;
break;
default:
av_log(avctx, AV_LOG_WARNING, "Invalid request_channel_layout\n");
break;
}
}
s->ctx = dcadec_context_create(flags);
if (!s->ctx)
return AVERROR(ENOMEM);
avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
avctx->bits_per_raw_sample = 24;
return 0;
}
static const AVProfile profiles[] = {
{ FF_PROFILE_DTS, "DTS" },
{ FF_PROFILE_DTS_ES, "DTS-ES" },
{ FF_PROFILE_DTS_96_24, "DTS 96/24" },
{ FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },
{ FF_PROFILE_DTS_HD_MA, "DTS-HD MA" },
{ FF_PROFILE_DTS_EXPRESS, "DTS Express" },
{ FF_PROFILE_UNKNOWN },
};
AVCodec ff_libdcadec_decoder = {
.name = "libdcadec",
.long_name = NULL_IF_CONFIG_SMALL("dcadec DCA decoder"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_DTS,
.priv_data_size = sizeof(DCADecContext),
.init = dcadec_init,
.decode = dcadec_decode_frame,
.close = dcadec_close,
.flush = dcadec_flush,
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_CHANNEL_CONF,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE },
.profiles = NULL_IF_CONFIG_SMALL(profiles),
};
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