1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* 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/avassert.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 = avpriv_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_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;
av_assert0(bits_per_sample >= 16);
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),
};
|
