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1 | /* |
2 | * LPCM codecs for PCM format found in Blu-ray PCM streams | |
3 | * Copyright (c) 2009, 2013 Christian Schmidt | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * PCM codec for Blu-ray PCM audio tracks | |
25 | */ | |
26 | ||
27 | #include "libavutil/channel_layout.h" | |
28 | #include "avcodec.h" | |
29 | #include "bytestream.h" | |
30 | #include "internal.h" | |
31 | ||
32 | /* | |
33 | * Channel Mapping according to | |
34 | * Blu-ray Disc Read-Only Format Version 1 | |
35 | * Part 3: Audio Visual Basic Specifications | |
36 | * mono M1 X | |
37 | * stereo L R | |
38 | * 3/0 L R C X | |
39 | * 2/1 L R S X | |
40 | * 3/1 L R C S | |
41 | * 2/2 L R LS RS | |
42 | * 3/2 L R C LS RS X | |
43 | * 3/2+lfe L R C LS RS lfe | |
44 | * 3/4 L R C LS Rls Rrs RS X | |
45 | * 3/4+lfe L R C LS Rls Rrs RS lfe | |
46 | */ | |
47 | ||
48 | /** | |
49 | * Parse the header of a LPCM frame read from a Blu-ray MPEG-TS stream | |
50 | * @param avctx the codec context | |
51 | * @param header pointer to the first four bytes of the data packet | |
52 | */ | |
53 | static int pcm_bluray_parse_header(AVCodecContext *avctx, | |
54 | const uint8_t *header) | |
55 | { | |
56 | static const uint8_t bits_per_samples[4] = { 0, 16, 20, 24 }; | |
57 | static const uint32_t channel_layouts[16] = { | |
58 | 0, AV_CH_LAYOUT_MONO, 0, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_SURROUND, | |
59 | AV_CH_LAYOUT_2_1, AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_2_2, | |
60 | AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1, AV_CH_LAYOUT_7POINT0, | |
61 | AV_CH_LAYOUT_7POINT1, 0, 0, 0, 0 | |
62 | }; | |
63 | static const uint8_t channels[16] = { | |
64 | 0, 1, 0, 2, 3, 3, 4, 4, 5, 6, 7, 8, 0, 0, 0, 0 | |
65 | }; | |
66 | uint8_t channel_layout = header[2] >> 4; | |
67 | ||
68 | if (avctx->debug & FF_DEBUG_PICT_INFO) | |
69 | av_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n", | |
70 | header[0], header[1], header[2], header[3]); | |
71 | ||
72 | /* get the sample depth and derive the sample format from it */ | |
73 | avctx->bits_per_coded_sample = bits_per_samples[header[3] >> 6]; | |
74 | if (!(avctx->bits_per_coded_sample == 16 || avctx->bits_per_coded_sample == 24)) { | |
75 | av_log(avctx, AV_LOG_ERROR, "unsupported sample depth (%d)\n", avctx->bits_per_coded_sample); | |
76 | return AVERROR_INVALIDDATA; | |
77 | } | |
78 | avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16 | |
79 | : AV_SAMPLE_FMT_S32; | |
80 | if (avctx->sample_fmt == AV_SAMPLE_FMT_S32) | |
81 | avctx->bits_per_raw_sample = avctx->bits_per_coded_sample; | |
82 | ||
83 | /* get the sample rate. Not all values are used. */ | |
84 | switch (header[2] & 0x0f) { | |
85 | case 1: | |
86 | avctx->sample_rate = 48000; | |
87 | break; | |
88 | case 4: | |
89 | avctx->sample_rate = 96000; | |
90 | break; | |
91 | case 5: | |
92 | avctx->sample_rate = 192000; | |
93 | break; | |
94 | default: | |
95 | avctx->sample_rate = 0; | |
96 | av_log(avctx, AV_LOG_ERROR, "reserved sample rate (%d)\n", | |
97 | header[2] & 0x0f); | |
98 | return AVERROR_INVALIDDATA; | |
99 | } | |
100 | ||
101 | /* | |
102 | * get the channel number (and mapping). Not all values are used. | |
103 | * It must be noted that the number of channels in the MPEG stream can | |
104 | * differ from the actual meaningful number, e.g. mono audio still has two | |
105 | * channels, one being empty. | |
106 | */ | |
107 | avctx->channel_layout = channel_layouts[channel_layout]; | |
108 | avctx->channels = channels[channel_layout]; | |
109 | if (!avctx->channels) { | |
110 | av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n", | |
111 | channel_layout); | |
112 | return AVERROR_INVALIDDATA; | |
113 | } | |
114 | ||
115 | avctx->bit_rate = FFALIGN(avctx->channels, 2) * avctx->sample_rate * | |
116 | avctx->bits_per_coded_sample; | |
117 | ||
118 | if (avctx->debug & FF_DEBUG_PICT_INFO) | |
119 | av_dlog(avctx, | |
120 | "pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %d bit/s\n", | |
121 | avctx->channels, avctx->bits_per_coded_sample, | |
122 | avctx->sample_rate, avctx->bit_rate); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int pcm_bluray_decode_frame(AVCodecContext *avctx, void *data, | |
127 | int *got_frame_ptr, AVPacket *avpkt) | |
128 | { | |
129 | AVFrame *frame = data; | |
130 | const uint8_t *src = avpkt->data; | |
131 | int buf_size = avpkt->size; | |
132 | GetByteContext gb; | |
133 | int num_source_channels, channel, retval; | |
134 | int sample_size, samples; | |
135 | int16_t *dst16; | |
136 | int32_t *dst32; | |
137 | ||
138 | if (buf_size < 4) { | |
139 | av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n"); | |
140 | return AVERROR_INVALIDDATA; | |
141 | } | |
142 | ||
143 | if ((retval = pcm_bluray_parse_header(avctx, src))) | |
144 | return retval; | |
145 | src += 4; | |
146 | buf_size -= 4; | |
147 | ||
148 | bytestream2_init(&gb, src, buf_size); | |
149 | ||
150 | /* There's always an even number of channels in the source */ | |
151 | num_source_channels = FFALIGN(avctx->channels, 2); | |
152 | sample_size = (num_source_channels * | |
153 | (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3; | |
154 | samples = buf_size / sample_size; | |
155 | ||
156 | /* get output buffer */ | |
157 | frame->nb_samples = samples; | |
158 | if ((retval = ff_get_buffer(avctx, frame, 0)) < 0) | |
159 | return retval; | |
160 | dst16 = (int16_t *)frame->data[0]; | |
161 | dst32 = (int32_t *)frame->data[0]; | |
162 | ||
163 | if (samples) { | |
164 | switch (avctx->channel_layout) { | |
165 | /* cases with same number of source and coded channels */ | |
166 | case AV_CH_LAYOUT_STEREO: | |
167 | case AV_CH_LAYOUT_4POINT0: | |
168 | case AV_CH_LAYOUT_2_2: | |
169 | samples *= num_source_channels; | |
170 | if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
171 | #if HAVE_BIGENDIAN | |
172 | bytestream2_get_buffer(&gb, dst16, buf_size); | |
173 | #else | |
174 | do { | |
175 | *dst16++ = bytestream2_get_be16u(&gb); | |
176 | } while (--samples); | |
177 | #endif | |
178 | } else { | |
179 | do { | |
180 | *dst32++ = bytestream2_get_be24u(&gb) << 8; | |
181 | } while (--samples); | |
182 | } | |
183 | break; | |
184 | /* cases where number of source channels = coded channels + 1 */ | |
185 | case AV_CH_LAYOUT_MONO: | |
186 | case AV_CH_LAYOUT_SURROUND: | |
187 | case AV_CH_LAYOUT_2_1: | |
188 | case AV_CH_LAYOUT_5POINT0: | |
189 | if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
190 | do { | |
191 | #if HAVE_BIGENDIAN | |
192 | bytestream2_get_buffer(&gb, dst16, avctx->channels * 2); | |
193 | dst16 += avctx->channels; | |
194 | #else | |
195 | channel = avctx->channels; | |
196 | do { | |
197 | *dst16++ = bytestream2_get_be16u(&gb); | |
198 | } while (--channel); | |
199 | #endif | |
200 | bytestream2_skip(&gb, 2); | |
201 | } while (--samples); | |
202 | } else { | |
203 | do { | |
204 | channel = avctx->channels; | |
205 | do { | |
206 | *dst32++ = bytestream2_get_be24u(&gb) << 8; | |
207 | } while (--channel); | |
208 | bytestream2_skip(&gb, 3); | |
209 | } while (--samples); | |
210 | } | |
211 | break; | |
212 | /* remapping: L, R, C, LBack, RBack, LF */ | |
213 | case AV_CH_LAYOUT_5POINT1: | |
214 | if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
215 | do { | |
216 | dst16[0] = bytestream2_get_be16u(&gb); | |
217 | dst16[1] = bytestream2_get_be16u(&gb); | |
218 | dst16[2] = bytestream2_get_be16u(&gb); | |
219 | dst16[4] = bytestream2_get_be16u(&gb); | |
220 | dst16[5] = bytestream2_get_be16u(&gb); | |
221 | dst16[3] = bytestream2_get_be16u(&gb); | |
222 | dst16 += 6; | |
223 | } while (--samples); | |
224 | } else { | |
225 | do { | |
226 | dst32[0] = bytestream2_get_be24u(&gb) << 8; | |
227 | dst32[1] = bytestream2_get_be24u(&gb) << 8; | |
228 | dst32[2] = bytestream2_get_be24u(&gb) << 8; | |
229 | dst32[4] = bytestream2_get_be24u(&gb) << 8; | |
230 | dst32[5] = bytestream2_get_be24u(&gb) << 8; | |
231 | dst32[3] = bytestream2_get_be24u(&gb) << 8; | |
232 | dst32 += 6; | |
233 | } while (--samples); | |
234 | } | |
235 | break; | |
236 | /* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */ | |
237 | case AV_CH_LAYOUT_7POINT0: | |
238 | if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
239 | do { | |
240 | dst16[0] = bytestream2_get_be16u(&gb); | |
241 | dst16[1] = bytestream2_get_be16u(&gb); | |
242 | dst16[2] = bytestream2_get_be16u(&gb); | |
243 | dst16[5] = bytestream2_get_be16u(&gb); | |
244 | dst16[3] = bytestream2_get_be16u(&gb); | |
245 | dst16[4] = bytestream2_get_be16u(&gb); | |
246 | dst16[6] = bytestream2_get_be16u(&gb); | |
247 | dst16 += 7; | |
248 | bytestream2_skip(&gb, 2); | |
249 | } while (--samples); | |
250 | } else { | |
251 | do { | |
252 | dst32[0] = bytestream2_get_be24u(&gb) << 8; | |
253 | dst32[1] = bytestream2_get_be24u(&gb) << 8; | |
254 | dst32[2] = bytestream2_get_be24u(&gb) << 8; | |
255 | dst32[5] = bytestream2_get_be24u(&gb) << 8; | |
256 | dst32[3] = bytestream2_get_be24u(&gb) << 8; | |
257 | dst32[4] = bytestream2_get_be24u(&gb) << 8; | |
258 | dst32[6] = bytestream2_get_be24u(&gb) << 8; | |
259 | dst32 += 7; | |
260 | bytestream2_skip(&gb, 3); | |
261 | } while (--samples); | |
262 | } | |
263 | break; | |
264 | /* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */ | |
265 | case AV_CH_LAYOUT_7POINT1: | |
266 | if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) { | |
267 | do { | |
268 | dst16[0] = bytestream2_get_be16u(&gb); | |
269 | dst16[1] = bytestream2_get_be16u(&gb); | |
270 | dst16[2] = bytestream2_get_be16u(&gb); | |
271 | dst16[6] = bytestream2_get_be16u(&gb); | |
272 | dst16[4] = bytestream2_get_be16u(&gb); | |
273 | dst16[5] = bytestream2_get_be16u(&gb); | |
274 | dst16[7] = bytestream2_get_be16u(&gb); | |
275 | dst16[3] = bytestream2_get_be16u(&gb); | |
276 | dst16 += 8; | |
277 | } while (--samples); | |
278 | } else { | |
279 | do { | |
280 | dst32[0] = bytestream2_get_be24u(&gb) << 8; | |
281 | dst32[1] = bytestream2_get_be24u(&gb) << 8; | |
282 | dst32[2] = bytestream2_get_be24u(&gb) << 8; | |
283 | dst32[6] = bytestream2_get_be24u(&gb) << 8; | |
284 | dst32[4] = bytestream2_get_be24u(&gb) << 8; | |
285 | dst32[5] = bytestream2_get_be24u(&gb) << 8; | |
286 | dst32[7] = bytestream2_get_be24u(&gb) << 8; | |
287 | dst32[3] = bytestream2_get_be24u(&gb) << 8; | |
288 | dst32 += 8; | |
289 | } while (--samples); | |
290 | } | |
291 | break; | |
292 | } | |
293 | } | |
294 | ||
295 | *got_frame_ptr = 1; | |
296 | ||
297 | retval = bytestream2_tell(&gb); | |
298 | if (avctx->debug & FF_DEBUG_BITSTREAM) | |
299 | av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n", | |
300 | retval, buf_size); | |
301 | return retval + 4; | |
302 | } | |
303 | ||
304 | AVCodec ff_pcm_bluray_decoder = { | |
305 | .name = "pcm_bluray", | |
306 | .long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"), | |
307 | .type = AVMEDIA_TYPE_AUDIO, | |
308 | .id = AV_CODEC_ID_PCM_BLURAY, | |
309 | .decode = pcm_bluray_decode_frame, | |
310 | .capabilities = CODEC_CAP_DR1, | |
311 | .sample_fmts = (const enum AVSampleFormat[]){ | |
312 | AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE | |
313 | }, | |
314 | }; |