blob: 22c1c08bcf1502adc4154aa79101e95aef3b4811
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 | ff_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 | ff_dlog(avctx, |
120 | "pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %"PRId64" bit/s\n", |
121 | avctx->channels, avctx->bits_per_coded_sample, |
122 | avctx->sample_rate, (int64_t)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 | ff_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 = AV_CODEC_CAP_DR1, |
311 | .sample_fmts = (const enum AVSampleFormat[]){ |
312 | AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE |
313 | }, |
314 | }; |
315 |