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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
/*
* LPCM codecs for PCM formats found in Blu-ray m2ts streams
*
* 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 "libavutil/channel_layout.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "encode.h"
typedef struct BlurayPCMEncContext {
uint16_t header; // Header added to every frame
} BlurayPCMEncContext;
static av_cold int pcm_bluray_encode_init(AVCodecContext *avctx)
{
BlurayPCMEncContext *s = avctx->priv_data;
uint8_t ch_layout;
int quant, freq, frame_size;
switch (avctx->sample_fmt) {
case AV_SAMPLE_FMT_S16:
avctx->bits_per_coded_sample = 16;
frame_size = 240;
quant = 1;
break;
case AV_SAMPLE_FMT_S32:
frame_size = 360;
avctx->bits_per_coded_sample = 24;
quant = 3;
break;
default:
return AVERROR_BUG;
}
switch (avctx->sample_rate) {
case 48000:
freq = 1;
break;
case 96000:
freq = 4;
break;
case 192000:
freq = 5;
break;
default:
return AVERROR_BUG;
}
switch (av_channel_layout_subset(&avctx->ch_layout, ~(uint64_t)0)) {
case AV_CH_LAYOUT_MONO:
ch_layout = 1;
break;
case AV_CH_LAYOUT_STEREO:
ch_layout = 3;
break;
case AV_CH_LAYOUT_SURROUND:
ch_layout = 4;
break;
case AV_CH_LAYOUT_2_1:
ch_layout = 5;
break;
case AV_CH_LAYOUT_4POINT0:
ch_layout = 6;
break;
case AV_CH_LAYOUT_2_2:
ch_layout = 7;
break;
case AV_CH_LAYOUT_5POINT0:
ch_layout = 8;
break;
case AV_CH_LAYOUT_5POINT1:
ch_layout = 9;
break;
case AV_CH_LAYOUT_7POINT0:
ch_layout = 10;
break;
case AV_CH_LAYOUT_7POINT1:
ch_layout = 11;
break;
default:
return AVERROR_BUG;
}
s->header = (((ch_layout << 4) | freq) << 8) | (quant << 6);
avctx->frame_size = frame_size;
return 0;
}
static int pcm_bluray_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
BlurayPCMEncContext *s = avctx->priv_data;
int sample_size, samples, channel, num_dest_channels;
const int16_t *src16;
const int32_t *src32;
unsigned pkt_size;
PutByteContext pb;
int ret;
num_dest_channels = FFALIGN(avctx->ch_layout.nb_channels, 2);
sample_size = (num_dest_channels *
(avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
samples = frame->nb_samples;
pkt_size = sample_size * samples + 4;
if ((ret = ff_get_encode_buffer(avctx, avpkt, pkt_size, 0)) < 0)
return ret;
AV_WB16(avpkt->data, pkt_size - 4);
AV_WB16(avpkt->data + 2, s->header);
src16 = (const int16_t *)frame->data[0];
src32 = (const int32_t *)frame->data[0];
bytestream2_init_writer(&pb, avpkt->data + 4, avpkt->size - 4);
switch (avctx->ch_layout.u.mask) {
/* cases with same number of source and coded channels */
case AV_CH_LAYOUT_STEREO:
case AV_CH_LAYOUT_4POINT0:
case AV_CH_LAYOUT_2_2:
samples *= num_dest_channels;
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
#if HAVE_BIGENDIAN
bytestream2_put_bufferu(&pb, frame->data[0], samples * 2);
#else
do {
bytestream2_put_be16u(&pb, *src16++);
} while (--samples);
#endif
} else {
do {
bytestream2_put_be24u(&pb, (*src32++) >> 8);
} while (--samples);
}
break;
/* cases where number of source channels = coded channels + 1 */
case AV_CH_LAYOUT_MONO:
case AV_CH_LAYOUT_SURROUND:
case AV_CH_LAYOUT_2_1:
case AV_CH_LAYOUT_5POINT0:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
#if HAVE_BIGENDIAN
bytestream2_put_bufferu(&pb, (const uint8_t *)src16, avctx->ch_layout.nb_channels * 2);
src16 += avctx->ch_layout.nb_channels;
#else
channel = avctx->ch_layout.nb_channels;
do {
bytestream2_put_be16u(&pb, *src16++);
} while (--channel);
#endif
bytestream2_put_ne16(&pb, 0);
} while (--samples);
} else {
do {
channel = avctx->ch_layout.nb_channels;
do {
bytestream2_put_be24u(&pb, (*src32++) >> 8);
} while (--channel);
bytestream2_put_ne24(&pb, 0);
} while (--samples);
}
break;
/* remapping: L, R, C, LBack, RBack, LF */
case AV_CH_LAYOUT_5POINT1:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
bytestream2_put_be16u(&pb, src16[0]);
bytestream2_put_be16u(&pb, src16[1]);
bytestream2_put_be16u(&pb, src16[2]);
bytestream2_put_be16u(&pb, src16[4]);
bytestream2_put_be16u(&pb, src16[5]);
bytestream2_put_be16u(&pb, src16[3]);
src16 += 6;
} while (--samples);
} else {
do {
bytestream2_put_be24u(&pb, src32[0] >> 8);
bytestream2_put_be24u(&pb, src32[1] >> 8);
bytestream2_put_be24u(&pb, src32[2] >> 8);
bytestream2_put_be24u(&pb, src32[4] >> 8);
bytestream2_put_be24u(&pb, src32[5] >> 8);
bytestream2_put_be24u(&pb, src32[3] >> 8);
src32 += 6;
} while (--samples);
}
break;
/* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */
case AV_CH_LAYOUT_7POINT0:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
bytestream2_put_be16u(&pb, src16[0]);
bytestream2_put_be16u(&pb, src16[1]);
bytestream2_put_be16u(&pb, src16[2]);
bytestream2_put_be16u(&pb, src16[5]);
bytestream2_put_be16u(&pb, src16[3]);
bytestream2_put_be16u(&pb, src16[4]);
bytestream2_put_be16u(&pb, src16[6]);
src16 += 7;
bytestream2_put_ne16(&pb, 0);
} while (--samples);
} else {
do {
bytestream2_put_be24u(&pb, src32[0] >> 8);
bytestream2_put_be24u(&pb, src32[1] >> 8);
bytestream2_put_be24u(&pb, src32[2] >> 8);
bytestream2_put_be24u(&pb, src32[5] >> 8);
bytestream2_put_be24u(&pb, src32[3] >> 8);
bytestream2_put_be24u(&pb, src32[4] >> 8);
bytestream2_put_be24u(&pb, src32[6] >> 8);
src32 += 7;
bytestream2_put_ne24(&pb, 0);
} while (--samples);
}
break;
/* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */
case AV_CH_LAYOUT_7POINT1:
if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
do {
bytestream2_put_be16u(&pb, src16[0]);
bytestream2_put_be16u(&pb, src16[1]);
bytestream2_put_be16u(&pb, src16[2]);
bytestream2_put_be16u(&pb, src16[6]);
bytestream2_put_be16u(&pb, src16[4]);
bytestream2_put_be16u(&pb, src16[5]);
bytestream2_put_be16u(&pb, src16[7]);
bytestream2_put_be16u(&pb, src16[3]);
src16 += 8;
} while (--samples);
} else {
do {
bytestream2_put_be24u(&pb, src32[0]);
bytestream2_put_be24u(&pb, src32[1]);
bytestream2_put_be24u(&pb, src32[2]);
bytestream2_put_be24u(&pb, src32[6]);
bytestream2_put_be24u(&pb, src32[4]);
bytestream2_put_be24u(&pb, src32[5]);
bytestream2_put_be24u(&pb, src32[7]);
bytestream2_put_be24u(&pb, src32[3]);
src32 += 8;
} while (--samples);
}
break;
default:
return AVERROR_BUG;
}
*got_packet_ptr = 1;
return 0;
}
const FFCodec ff_pcm_bluray_encoder = {
.p.name = "pcm_bluray",
CODEC_LONG_NAME("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_PCM_BLURAY,
.priv_data_size = sizeof(BlurayPCMEncContext),
.init = pcm_bluray_encode_init,
FF_CODEC_ENCODE_CB(pcm_bluray_encode_frame),
.p.supported_samplerates = (const int[]) { 48000, 96000, 192000, 0 },
.p.ch_layouts = (const AVChannelLayout[]) {
AV_CHANNEL_LAYOUT_MONO,
AV_CHANNEL_LAYOUT_STEREO,
AV_CHANNEL_LAYOUT_SURROUND,
AV_CHANNEL_LAYOUT_2_1,
AV_CHANNEL_LAYOUT_4POINT0,
AV_CHANNEL_LAYOUT_2_2,
AV_CHANNEL_LAYOUT_5POINT0,
AV_CHANNEL_LAYOUT_5POINT1,
AV_CHANNEL_LAYOUT_7POINT0,
AV_CHANNEL_LAYOUT_7POINT1,
{ 0 } },
.p.sample_fmts = (const enum AVSampleFormat[]) {
AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE },
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
};
|
