libavcodec/libdcadec.c

   1 /*
   2  * libdcadec decoder wrapper
   3  * Copyright (C) 2015 Hendrik Leppkes
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <libdcadec/dca_context.h>
  23
  24 #include "libavutil/channel_layout.h"
  25 #include "libavutil/common.h"
  26 #include "libavutil/opt.h"
  27
  28 #include "avcodec.h"
  29 #include "dca.h"
  30 #include "dca_syncwords.h"
  31 #include "internal.h"
  32
  33 typedef struct DCADecContext {
  34     struct dcadec_context *ctx;
  35     uint8_t *buffer;
  36     int buffer_size;
  37 } DCADecContext;
  38
  39 static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
  40                                int *got_frame_ptr, AVPacket *avpkt)
  41 {
  42     DCADecContext *s = avctx->priv_data;
  43     AVFrame *frame = data;
  44     int ret, i, k;
  45     int **samples, nsamples, channel_mask, sample_rate, bits_per_sample, profile;
  46     uint32_t mrk;
  47     uint8_t *input = avpkt->data;
  48     int input_size = avpkt->size;
  49
  50     /* convert bytestream syntax to RAW BE format if required */
  51     if (input_size < 8) {
  52         av_log(avctx, AV_LOG_ERROR, "Input size too small\n");
  53         return AVERROR_INVALIDDATA;
  54     }
  55     mrk = AV_RB32(input);
  56     if (mrk != DCA_SYNCWORD_CORE_BE && mrk != DCA_SYNCWORD_SUBSTREAM) {
  57         s->buffer = av_fast_realloc(s->buffer, &s->buffer_size, avpkt->size + AV_INPUT_BUFFER_PADDING_SIZE);
  58         if (!s->buffer)
  59             return AVERROR(ENOMEM);
  60
  61         if ((ret = ff_dca_convert_bitstream(avpkt->data, avpkt->size, s->buffer, s->buffer_size)) < 0)
  62             return ret;
  63
  64         input      = s->buffer;
  65         input_size = ret;
  66     }
  67
  68     if ((ret = dcadec_context_parse(s->ctx, input, input_size)) < 0) {
  69         av_log(avctx, AV_LOG_ERROR, "dcadec_context_parse() failed: %d (%s)\n", -ret, dcadec_strerror(ret));
  70         return AVERROR_UNKNOWN;
  71     }
  72     if ((ret = dcadec_context_filter(s->ctx, &samples, &nsamples, &channel_mask,
  73                                      &sample_rate, &bits_per_sample, &profile)) < 0) {
  74         av_log(avctx, AV_LOG_ERROR, "dcadec_context_filter() failed: %d (%s)\n", -ret, dcadec_strerror(ret));
  75         return AVERROR_UNKNOWN;
  76     }
  77
  78     avctx->channels       = av_get_channel_layout_nb_channels(channel_mask);
  79     avctx->channel_layout = channel_mask;
  80     avctx->sample_rate    = sample_rate;
  81
  82     if (bits_per_sample == 16)
  83         avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
  84     else if (bits_per_sample <= 24)
  85         avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
  86     else {
  87         av_log(avctx, AV_LOG_ERROR, "Unsupported number of bits per sample: %d\n",
  88                bits_per_sample);
  89         return AVERROR(ENOSYS);
  90     }
  91
  92     avctx->bits_per_raw_sample = bits_per_sample;
  93
  94     switch (profile) {
  95     case DCADEC_PROFILE_DS:
  96         avctx->profile = FF_PROFILE_DTS;
  97         break;
  98     case DCADEC_PROFILE_DS_96_24:
  99         avctx->profile = FF_PROFILE_DTS_96_24;
 100         break;
 101     case DCADEC_PROFILE_DS_ES:
 102         avctx->profile = FF_PROFILE_DTS_ES;
 103         break;
 104     case DCADEC_PROFILE_HD_HRA:
 105         avctx->profile = FF_PROFILE_DTS_HD_HRA;
 106         break;
 107     case DCADEC_PROFILE_HD_MA:
 108         avctx->profile = FF_PROFILE_DTS_HD_MA;
 109         break;
 110     case DCADEC_PROFILE_EXPRESS:
 111         avctx->profile = FF_PROFILE_DTS_EXPRESS;
 112         break;
 113     case DCADEC_PROFILE_UNKNOWN:
 114     default:
 115         avctx->profile = FF_PROFILE_UNKNOWN;
 116         break;
 117     }
 118
 119     /* bitrate is only meaningful if there are no HD extensions, as they distort the bitrate */
 120     if (profile == DCADEC_PROFILE_DS || profile == DCADEC_PROFILE_DS_96_24 || profile == DCADEC_PROFILE_DS_ES) {
 121         struct dcadec_core_info *info = dcadec_context_get_core_info(s->ctx);
 122         avctx->bit_rate = info->bit_rate;
 123         dcadec_context_free_core_info(info);
 124     } else
 125         avctx->bit_rate = 0;
 126
 127     frame->nb_samples = nsamples;
 128     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
 129         return ret;
 130
 131     for (i = 0; i < avctx->channels; i++) {
 132         if (frame->format == AV_SAMPLE_FMT_S16P) {
 133             int16_t *plane = (int16_t *)frame->extended_data[i];
 134             for (k = 0; k < nsamples; k++)
 135                 plane[k] = samples[i][k];
 136         } else {
 137             int32_t *plane = (int32_t *)frame->extended_data[i];
 138             int shift = 32 - bits_per_sample;
 139             for (k = 0; k < nsamples; k++)
 140                 plane[k] = samples[i][k] << shift;
 141         }
 142     }
 143
 144     *got_frame_ptr = 1;
 145
 146     return avpkt->size;
 147 }
 148
 149 static av_cold void dcadec_flush(AVCodecContext *avctx)
 150 {
 151     DCADecContext *s = avctx->priv_data;
 152     dcadec_context_clear(s->ctx);
 153 }
 154
 155 static av_cold int dcadec_close(AVCodecContext *avctx)
 156 {
 157     DCADecContext *s = avctx->priv_data;
 158
 159     dcadec_context_destroy(s->ctx);
 160     s->ctx = NULL;
 161
 162     av_freep(&s->buffer);
 163
 164     return 0;
 165 }
 166
 167 static av_cold int dcadec_init(AVCodecContext *avctx)
 168 {
 169     DCADecContext *s = avctx->priv_data;
 170
 171     s->ctx = dcadec_context_create(0);
 172     if (!s->ctx)
 173         return AVERROR(ENOMEM);
 174
 175     avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
 176     avctx->bits_per_raw_sample = 24;
 177
 178     return 0;
 179 }
 180
 181 static const AVProfile profiles[] = {
 182     { FF_PROFILE_DTS,         "DTS"         },
 183     { FF_PROFILE_DTS_ES,      "DTS-ES"      },
 184     { FF_PROFILE_DTS_96_24,   "DTS 96/24"   },
 185     { FF_PROFILE_DTS_HD_HRA,  "DTS-HD HRA"  },
 186     { FF_PROFILE_DTS_HD_MA,   "DTS-HD MA"   },
 187     { FF_PROFILE_DTS_EXPRESS, "DTS Express" },
 188     { FF_PROFILE_UNKNOWN },
 189 };
 190
 191 AVCodec ff_libdcadec_decoder = {
 192     .name           = "libdcadec",
 193     .long_name      = NULL_IF_CONFIG_SMALL("dcadec DCA decoder"),
 194     .type           = AVMEDIA_TYPE_AUDIO,
 195     .id             = AV_CODEC_ID_DTS,
 196     .priv_data_size = sizeof(DCADecContext),
 197     .init           = dcadec_init,
 198     .decode         = dcadec_decode_frame,
 199     .close          = dcadec_close,
 200     .flush          = dcadec_flush,
 201     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
 202     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_S16P,
 203                                                       AV_SAMPLE_FMT_NONE },
 204     .profiles       = NULL_IF_CONFIG_SMALL(profiles),
 205     .wrapper_name   = "libdcadec",
 206 };