4f9f52558feafa3ce7d4052b85db0120d097868a
[libav.git] / libavcodec / pcm-mpeg.c
1 /*
2 * LPCM codecs for PCM formats found in MPEG streams
3 * Copyright (c) 2009 Christian Schmidt
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 /**
23 * @file
24 * PCM codecs for encodings found in MPEG streams (DVD/Blu-ray)
25 */
26
27 #include "libavutil/channel_layout.h"
28 #include "avcodec.h"
29 #include "bytestream.h"
30
31 /*
32 * Channel Mapping according to
33 * Blu-ray Disc Read-Only Format Version 1
34 * Part 3: Audio Visual Basic Specifications
35 * mono M1 X
36 * stereo L R
37 * 3/0 L R C X
38 * 2/1 L R S X
39 * 3/1 L R C S
40 * 2/2 L R LS RS
41 * 3/2 L R C LS RS X
42 * 3/2+lfe L R C LS RS lfe
43 * 3/4 L R C LS Rls Rrs RS X
44 * 3/4+lfe L R C LS Rls Rrs RS lfe
45 */
46
47 /**
48 * Parse the header of a LPCM frame read from a MPEG-TS stream
49 * @param avctx the codec context
50 * @param header pointer to the first four bytes of the data packet
51 */
52 static int pcm_bluray_parse_header(AVCodecContext *avctx,
53 const uint8_t *header)
54 {
55 static const uint8_t bits_per_samples[4] = { 0, 16, 20, 24 };
56 static const uint32_t channel_layouts[16] = {
57 0, AV_CH_LAYOUT_MONO, 0, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_SURROUND,
58 AV_CH_LAYOUT_2_1, AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_2_2, AV_CH_LAYOUT_5POINT0,
59 AV_CH_LAYOUT_5POINT1, AV_CH_LAYOUT_7POINT0, AV_CH_LAYOUT_7POINT1, 0, 0, 0, 0
60 };
61 static const uint8_t channels[16] = {
62 0, 1, 0, 2, 3, 3, 4, 4, 5, 6, 7, 8, 0, 0, 0, 0
63 };
64 uint8_t channel_layout = header[2] >> 4;
65
66 if (avctx->debug & FF_DEBUG_PICT_INFO)
67 av_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n",
68 header[0], header[1], header[2], header[3]);
69
70 /* get the sample depth and derive the sample format from it */
71 avctx->bits_per_coded_sample = bits_per_samples[header[3] >> 6];
72 if (!avctx->bits_per_coded_sample) {
73 av_log(avctx, AV_LOG_ERROR, "reserved sample depth (0)\n");
74 return -1;
75 }
76 avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16 :
77 AV_SAMPLE_FMT_S32;
78 avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
79
80 /* get the sample rate. Not all values are used. */
81 switch (header[2] & 0x0f) {
82 case 1:
83 avctx->sample_rate = 48000;
84 break;
85 case 4:
86 avctx->sample_rate = 96000;
87 break;
88 case 5:
89 avctx->sample_rate = 192000;
90 break;
91 default:
92 avctx->sample_rate = 0;
93 av_log(avctx, AV_LOG_ERROR, "reserved sample rate (%d)\n",
94 header[2] & 0x0f);
95 return -1;
96 }
97
98 /*
99 * get the channel number (and mapping). Not all values are used.
100 * It must be noted that the number of channels in the MPEG stream can
101 * differ from the actual meaningful number, e.g. mono audio still has two
102 * channels, one being empty.
103 */
104 avctx->channel_layout = channel_layouts[channel_layout];
105 avctx->channels = channels[channel_layout];
106 if (!avctx->channels) {
107 av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n",
108 channel_layout);
109 return -1;
110 }
111
112 avctx->bit_rate = FFALIGN(avctx->channels, 2) * avctx->sample_rate *
113 avctx->bits_per_coded_sample;
114
115 if (avctx->debug & FF_DEBUG_PICT_INFO)
116 av_dlog(avctx,
117 "pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %d bit/s\n",
118 avctx->channels, avctx->bits_per_coded_sample,
119 avctx->sample_rate, avctx->bit_rate);
120 return 0;
121 }
122
123 typedef struct PCMBRDecode {
124 AVFrame frame;
125 } PCMBRDecode;
126
127 static av_cold int pcm_bluray_decode_init(AVCodecContext * avctx)
128 {
129 PCMBRDecode *s = avctx->priv_data;
130
131 avcodec_get_frame_defaults(&s->frame);
132 avctx->coded_frame = &s->frame;
133
134 return 0;
135 }
136
137 static int pcm_bluray_decode_frame(AVCodecContext *avctx, void *data,
138 int *got_frame_ptr, AVPacket *avpkt)
139 {
140 const uint8_t *src = avpkt->data;
141 int buf_size = avpkt->size;
142 PCMBRDecode *s = avctx->priv_data;
143 GetByteContext gb;
144 int num_source_channels, channel, retval;
145 int sample_size, samples;
146 int16_t *dst16;
147 int32_t *dst32;
148
149 if (buf_size < 4) {
150 av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n");
151 return -1;
152 }
153
154 if (pcm_bluray_parse_header(avctx, src))
155 return -1;
156 src += 4;
157 buf_size -= 4;
158
159 bytestream2_init(&gb, src, buf_size);
160
161 /* There's always an even number of channels in the source */
162 num_source_channels = FFALIGN(avctx->channels, 2);
163 sample_size = (num_source_channels * (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
164 samples = buf_size / sample_size;
165
166 /* get output buffer */
167 s->frame.nb_samples = samples;
168 if ((retval = avctx->get_buffer(avctx, &s->frame)) < 0) {
169 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
170 return retval;
171 }
172 dst16 = (int16_t *)s->frame.data[0];
173 dst32 = (int32_t *)s->frame.data[0];
174
175 if (samples) {
176 switch (avctx->channel_layout) {
177 /* cases with same number of source and coded channels */
178 case AV_CH_LAYOUT_STEREO:
179 case AV_CH_LAYOUT_4POINT0:
180 case AV_CH_LAYOUT_2_2:
181 samples *= num_source_channels;
182 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
183 #if HAVE_BIGENDIAN
184 bytestream2_get_buffer(&gb, dst16, buf_size);
185 #else
186 do {
187 *dst16++ = bytestream2_get_be16u(&gb);
188 } while (--samples);
189 #endif
190 } else {
191 do {
192 *dst32++ = bytestream2_get_be24u(&gb) << 8;
193 } while (--samples);
194 }
195 break;
196 /* cases where number of source channels = coded channels + 1 */
197 case AV_CH_LAYOUT_MONO:
198 case AV_CH_LAYOUT_SURROUND:
199 case AV_CH_LAYOUT_2_1:
200 case AV_CH_LAYOUT_5POINT0:
201 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
202 do {
203 #if HAVE_BIGENDIAN
204 bytestream2_get_buffer(&gb, dst16, avctx->channels * 2);
205 dst16 += avctx->channels;
206 #else
207 channel = avctx->channels;
208 do {
209 *dst16++ = bytestream2_get_be16u(&gb);
210 } while (--channel);
211 #endif
212 bytestream2_skip(&gb, 2);
213 } while (--samples);
214 } else {
215 do {
216 channel = avctx->channels;
217 do {
218 *dst32++ = bytestream2_get_be24u(&gb) << 8;
219 } while (--channel);
220 bytestream2_skip(&gb, 3);
221 } while (--samples);
222 }
223 break;
224 /* remapping: L, R, C, LBack, RBack, LF */
225 case AV_CH_LAYOUT_5POINT1:
226 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
227 do {
228 dst16[0] = bytestream2_get_be16u(&gb);
229 dst16[1] = bytestream2_get_be16u(&gb);
230 dst16[2] = bytestream2_get_be16u(&gb);
231 dst16[4] = bytestream2_get_be16u(&gb);
232 dst16[5] = bytestream2_get_be16u(&gb);
233 dst16[3] = bytestream2_get_be16u(&gb);
234 dst16 += 6;
235 } while (--samples);
236 } else {
237 do {
238 dst32[0] = bytestream2_get_be24u(&gb) << 8;
239 dst32[1] = bytestream2_get_be24u(&gb) << 8;
240 dst32[2] = bytestream2_get_be24u(&gb) << 8;
241 dst32[4] = bytestream2_get_be24u(&gb) << 8;
242 dst32[5] = bytestream2_get_be24u(&gb) << 8;
243 dst32[3] = bytestream2_get_be24u(&gb) << 8;
244 dst32 += 6;
245 } while (--samples);
246 }
247 break;
248 /* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */
249 case AV_CH_LAYOUT_7POINT0:
250 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
251 do {
252 dst16[0] = bytestream2_get_be16u(&gb);
253 dst16[1] = bytestream2_get_be16u(&gb);
254 dst16[2] = bytestream2_get_be16u(&gb);
255 dst16[5] = bytestream2_get_be16u(&gb);
256 dst16[3] = bytestream2_get_be16u(&gb);
257 dst16[4] = bytestream2_get_be16u(&gb);
258 dst16[6] = bytestream2_get_be16u(&gb);
259 dst16 += 7;
260 bytestream2_skip(&gb, 2);
261 } while (--samples);
262 } else {
263 do {
264 dst32[0] = bytestream2_get_be24u(&gb) << 8;
265 dst32[1] = bytestream2_get_be24u(&gb) << 8;
266 dst32[2] = bytestream2_get_be24u(&gb) << 8;
267 dst32[5] = bytestream2_get_be24u(&gb) << 8;
268 dst32[3] = bytestream2_get_be24u(&gb) << 8;
269 dst32[4] = bytestream2_get_be24u(&gb) << 8;
270 dst32[6] = bytestream2_get_be24u(&gb) << 8;
271 dst32 += 7;
272 bytestream2_skip(&gb, 3);
273 } while (--samples);
274 }
275 break;
276 /* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */
277 case AV_CH_LAYOUT_7POINT1:
278 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
279 do {
280 dst16[0] = bytestream2_get_be16u(&gb);
281 dst16[1] = bytestream2_get_be16u(&gb);
282 dst16[2] = bytestream2_get_be16u(&gb);
283 dst16[6] = bytestream2_get_be16u(&gb);
284 dst16[4] = bytestream2_get_be16u(&gb);
285 dst16[5] = bytestream2_get_be16u(&gb);
286 dst16[7] = bytestream2_get_be16u(&gb);
287 dst16[3] = bytestream2_get_be16u(&gb);
288 dst16 += 8;
289 } while (--samples);
290 } else {
291 do {
292 dst32[0] = bytestream2_get_be24u(&gb) << 8;
293 dst32[1] = bytestream2_get_be24u(&gb) << 8;
294 dst32[2] = bytestream2_get_be24u(&gb) << 8;
295 dst32[6] = bytestream2_get_be24u(&gb) << 8;
296 dst32[4] = bytestream2_get_be24u(&gb) << 8;
297 dst32[5] = bytestream2_get_be24u(&gb) << 8;
298 dst32[7] = bytestream2_get_be24u(&gb) << 8;
299 dst32[3] = bytestream2_get_be24u(&gb) << 8;
300 dst32 += 8;
301 } while (--samples);
302 }
303 break;
304 }
305 }
306
307 *got_frame_ptr = 1;
308 *(AVFrame *)data = s->frame;
309
310 retval = bytestream2_tell(&gb);
311 if (avctx->debug & FF_DEBUG_BITSTREAM)
312 av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n",
313 retval, buf_size);
314 return retval + 4;
315 }
316
317 AVCodec ff_pcm_bluray_decoder = {
318 .name = "pcm_bluray",
319 .type = AVMEDIA_TYPE_AUDIO,
320 .id = AV_CODEC_ID_PCM_BLURAY,
321 .priv_data_size = sizeof(PCMBRDecode),
322 .init = pcm_bluray_decode_init,
323 .decode = pcm_bluray_decode_frame,
324 .capabilities = CODEC_CAP_DR1,
325 .sample_fmts = (const enum AVSampleFormat[]){
326 AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE
327 },
328 .long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
329 };