FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pcm-bluray.c
Date: 2022-07-07 01:21:54
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Lines: 0 147 0.0%
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Line Branch Exec Source
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 "codec_internal.h"
31 #include "internal.h"
32
33 /*
34 * Channel Mapping according to
35 * Blu-ray Disc Read-Only Format Version 1
36 * Part 3: Audio Visual Basic Specifications
37 * mono M1 X
38 * stereo L R
39 * 3/0 L R C X
40 * 2/1 L R S X
41 * 3/1 L R C S
42 * 2/2 L R LS RS
43 * 3/2 L R C LS RS X
44 * 3/2+lfe L R C LS RS lfe
45 * 3/4 L R C LS Rls Rrs RS X
46 * 3/4+lfe L R C LS Rls Rrs RS lfe
47 */
48
49 /**
50 * Parse the header of a LPCM frame read from a Blu-ray MPEG-TS stream
51 * @param avctx the codec context
52 * @param header pointer to the first four bytes of the data packet
53 */
54 static int pcm_bluray_parse_header(AVCodecContext *avctx,
55 const uint8_t *header)
56 {
57 static const uint8_t bits_per_samples[4] = { 0, 16, 20, 24 };
58 static const AVChannelLayout channel_layouts[16] = {
59 { 0 }, AV_CHANNEL_LAYOUT_MONO, { 0 },
60 AV_CHANNEL_LAYOUT_STEREO, AV_CHANNEL_LAYOUT_SURROUND, AV_CHANNEL_LAYOUT_2_1,
61 AV_CHANNEL_LAYOUT_4POINT0, AV_CHANNEL_LAYOUT_2_2, AV_CHANNEL_LAYOUT_5POINT0,
62 AV_CHANNEL_LAYOUT_5POINT1, AV_CHANNEL_LAYOUT_7POINT0, AV_CHANNEL_LAYOUT_7POINT1,
63 { 0 }, { 0 }, { 0 }, { 0 },
64 };
65 uint8_t channel_layout = header[2] >> 4;
66
67 if (avctx->debug & FF_DEBUG_PICT_INFO)
68 ff_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n",
69 header[0], header[1], header[2], header[3]);
70
71 /* get the sample depth and derive the sample format from it */
72 avctx->bits_per_coded_sample = bits_per_samples[header[3] >> 6];
73 if (!(avctx->bits_per_coded_sample == 16 || avctx->bits_per_coded_sample == 24)) {
74 av_log(avctx, AV_LOG_ERROR, "unsupported sample depth (%d)\n", avctx->bits_per_coded_sample);
75 return AVERROR_INVALIDDATA;
76 }
77 avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16
78 : AV_SAMPLE_FMT_S32;
79 if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
80 avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
81
82 /* get the sample rate. Not all values are used. */
83 switch (header[2] & 0x0f) {
84 case 1:
85 avctx->sample_rate = 48000;
86 break;
87 case 4:
88 avctx->sample_rate = 96000;
89 break;
90 case 5:
91 avctx->sample_rate = 192000;
92 break;
93 default:
94 avctx->sample_rate = 0;
95 av_log(avctx, AV_LOG_ERROR, "reserved sample rate (%d)\n",
96 header[2] & 0x0f);
97 return AVERROR_INVALIDDATA;
98 }
99
100 /*
101 * get the channel number (and mapping). Not all values are used.
102 * It must be noted that the number of channels in the MPEG stream can
103 * differ from the actual meaningful number, e.g. mono audio still has two
104 * channels, one being empty.
105 */
106 av_channel_layout_uninit(&avctx->ch_layout);
107 avctx->ch_layout = channel_layouts[channel_layout];
108 if (!avctx->ch_layout.nb_channels) {
109 av_log(avctx, AV_LOG_ERROR, "reserved channel configuration (%d)\n",
110 channel_layout);
111 return AVERROR_INVALIDDATA;
112 }
113
114 avctx->bit_rate = FFALIGN(avctx->ch_layout.nb_channels, 2) * avctx->sample_rate *
115 avctx->bits_per_coded_sample;
116
117 if (avctx->debug & FF_DEBUG_PICT_INFO)
118 ff_dlog(avctx,
119 "pcm_bluray_parse_header: %d channels, %d bits per sample, %d Hz, %"PRId64" bit/s\n",
120 avctx->ch_layout.nb_channels, avctx->bits_per_coded_sample,
121 avctx->sample_rate, avctx->bit_rate);
122 return 0;
123 }
124
125 static int pcm_bluray_decode_frame(AVCodecContext *avctx, AVFrame *frame,
126 int *got_frame_ptr, AVPacket *avpkt)
127 {
128 const uint8_t *src = avpkt->data;
129 int buf_size = avpkt->size;
130 GetByteContext gb;
131 int num_source_channels, channel, retval;
132 int sample_size, samples;
133 int16_t *dst16;
134 int32_t *dst32;
135
136 if (buf_size < 4) {
137 av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n");
138 return AVERROR_INVALIDDATA;
139 }
140
141 if ((retval = pcm_bluray_parse_header(avctx, src)))
142 return retval;
143 src += 4;
144 buf_size -= 4;
145
146 bytestream2_init(&gb, src, buf_size);
147
148 /* There's always an even number of channels in the source */
149 num_source_channels = FFALIGN(avctx->ch_layout.nb_channels, 2);
150 sample_size = (num_source_channels *
151 (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
152 samples = buf_size / sample_size;
153
154 /* get output buffer */
155 frame->nb_samples = samples;
156 if ((retval = ff_get_buffer(avctx, frame, 0)) < 0)
157 return retval;
158 dst16 = (int16_t *)frame->data[0];
159 dst32 = (int32_t *)frame->data[0];
160
161 if (samples) {
162 switch (avctx->ch_layout.u.mask) {
163 /* cases with same number of source and coded channels */
164 case AV_CH_LAYOUT_STEREO:
165 case AV_CH_LAYOUT_4POINT0:
166 case AV_CH_LAYOUT_2_2:
167 samples *= num_source_channels;
168 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
169 #if HAVE_BIGENDIAN
170 bytestream2_get_buffer(&gb, dst16, buf_size);
171 #else
172 do {
173 *dst16++ = bytestream2_get_be16u(&gb);
174 } while (--samples);
175 #endif
176 } else {
177 do {
178 *dst32++ = bytestream2_get_be24u(&gb) << 8;
179 } while (--samples);
180 }
181 break;
182 /* cases where number of source channels = coded channels + 1 */
183 case AV_CH_LAYOUT_MONO:
184 case AV_CH_LAYOUT_SURROUND:
185 case AV_CH_LAYOUT_2_1:
186 case AV_CH_LAYOUT_5POINT0:
187 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
188 do {
189 #if HAVE_BIGENDIAN
190 bytestream2_get_buffer(&gb, dst16, avctx->ch_layout.nb_channels * 2);
191 dst16 += avctx->ch_layout.nb_channels;
192 #else
193 channel = avctx->ch_layout.nb_channels;
194 do {
195 *dst16++ = bytestream2_get_be16u(&gb);
196 } while (--channel);
197 #endif
198 bytestream2_skip(&gb, 2);
199 } while (--samples);
200 } else {
201 do {
202 channel = avctx->ch_layout.nb_channels;
203 do {
204 *dst32++ = bytestream2_get_be24u(&gb) << 8;
205 } while (--channel);
206 bytestream2_skip(&gb, 3);
207 } while (--samples);
208 }
209 break;
210 /* remapping: L, R, C, LBack, RBack, LF */
211 case AV_CH_LAYOUT_5POINT1:
212 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
213 do {
214 dst16[0] = bytestream2_get_be16u(&gb);
215 dst16[1] = bytestream2_get_be16u(&gb);
216 dst16[2] = bytestream2_get_be16u(&gb);
217 dst16[4] = bytestream2_get_be16u(&gb);
218 dst16[5] = bytestream2_get_be16u(&gb);
219 dst16[3] = bytestream2_get_be16u(&gb);
220 dst16 += 6;
221 } while (--samples);
222 } else {
223 do {
224 dst32[0] = bytestream2_get_be24u(&gb) << 8;
225 dst32[1] = bytestream2_get_be24u(&gb) << 8;
226 dst32[2] = bytestream2_get_be24u(&gb) << 8;
227 dst32[4] = bytestream2_get_be24u(&gb) << 8;
228 dst32[5] = bytestream2_get_be24u(&gb) << 8;
229 dst32[3] = bytestream2_get_be24u(&gb) << 8;
230 dst32 += 6;
231 } while (--samples);
232 }
233 break;
234 /* remapping: L, R, C, LSide, LBack, RBack, RSide, <unused> */
235 case AV_CH_LAYOUT_7POINT0:
236 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
237 do {
238 dst16[0] = bytestream2_get_be16u(&gb);
239 dst16[1] = bytestream2_get_be16u(&gb);
240 dst16[2] = bytestream2_get_be16u(&gb);
241 dst16[5] = bytestream2_get_be16u(&gb);
242 dst16[3] = bytestream2_get_be16u(&gb);
243 dst16[4] = bytestream2_get_be16u(&gb);
244 dst16[6] = bytestream2_get_be16u(&gb);
245 dst16 += 7;
246 bytestream2_skip(&gb, 2);
247 } while (--samples);
248 } else {
249 do {
250 dst32[0] = bytestream2_get_be24u(&gb) << 8;
251 dst32[1] = bytestream2_get_be24u(&gb) << 8;
252 dst32[2] = bytestream2_get_be24u(&gb) << 8;
253 dst32[5] = bytestream2_get_be24u(&gb) << 8;
254 dst32[3] = bytestream2_get_be24u(&gb) << 8;
255 dst32[4] = bytestream2_get_be24u(&gb) << 8;
256 dst32[6] = bytestream2_get_be24u(&gb) << 8;
257 dst32 += 7;
258 bytestream2_skip(&gb, 3);
259 } while (--samples);
260 }
261 break;
262 /* remapping: L, R, C, LSide, LBack, RBack, RSide, LF */
263 case AV_CH_LAYOUT_7POINT1:
264 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
265 do {
266 dst16[0] = bytestream2_get_be16u(&gb);
267 dst16[1] = bytestream2_get_be16u(&gb);
268 dst16[2] = bytestream2_get_be16u(&gb);
269 dst16[6] = bytestream2_get_be16u(&gb);
270 dst16[4] = bytestream2_get_be16u(&gb);
271 dst16[5] = bytestream2_get_be16u(&gb);
272 dst16[7] = bytestream2_get_be16u(&gb);
273 dst16[3] = bytestream2_get_be16u(&gb);
274 dst16 += 8;
275 } while (--samples);
276 } else {
277 do {
278 dst32[0] = bytestream2_get_be24u(&gb) << 8;
279 dst32[1] = bytestream2_get_be24u(&gb) << 8;
280 dst32[2] = bytestream2_get_be24u(&gb) << 8;
281 dst32[6] = bytestream2_get_be24u(&gb) << 8;
282 dst32[4] = bytestream2_get_be24u(&gb) << 8;
283 dst32[5] = bytestream2_get_be24u(&gb) << 8;
284 dst32[7] = bytestream2_get_be24u(&gb) << 8;
285 dst32[3] = bytestream2_get_be24u(&gb) << 8;
286 dst32 += 8;
287 } while (--samples);
288 }
289 break;
290 }
291 }
292
293 *got_frame_ptr = 1;
294
295 retval = bytestream2_tell(&gb);
296 if (avctx->debug & FF_DEBUG_BITSTREAM)
297 ff_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n",
298 retval, buf_size);
299 return retval + 4;
300 }
301
302 const FFCodec ff_pcm_bluray_decoder = {
303 .p.name = "pcm_bluray",
304 .p.long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
305 .p.type = AVMEDIA_TYPE_AUDIO,
306 .p.id = AV_CODEC_ID_PCM_BLURAY,
307 FF_CODEC_DECODE_CB(pcm_bluray_decode_frame),
308 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
309 .p.sample_fmts = (const enum AVSampleFormat[]){
310 AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE
311 },
312 };
313