lavc: add libdcadec decoder

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 205 insertions, 0 deletions

diff --git a/libavcodec/libdcadec.c b/libavcodec/libdcadec.c
new file mode 100644
index 0000000000..3ab3b1a652
--- /dev/null
+++ b/libavcodec/libdcadec.c
@@ -0,0 +1,205 @@
+/*
+ * libdcadec decoder wrapper
+ * Copyright (C) 2015 Hendrik Leppkes
+ *
+ * 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 <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;
+} DCADecContext;
+
+static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
+                               int *got_frame_ptr, AVPacket *avpkt)
+{
+    DCADecContext *s = avctx->priv_data;
+    AVFrame *frame = data;
+    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);
+
+        if ((ret = ff_dca_convert_bitstream(avpkt->data, avpkt->size, s->buffer, s->buffer_size)) < 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_UNKNOWN;
+    }
+    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_UNKNOWN;
+    }
+
+    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 <= 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;
+
+    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;
+
+    s->ctx = dcadec_context_create(0);
+    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),
+};