FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/s302m.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 53 111 47.7%
Branches: 17 81 21.0%

Line Branch Exec Source
1 /*
2 * SMPTE 302M decoder
3 * Copyright (c) 2008 Laurent Aimar <fenrir@videolan.org>
4 * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "libavutil/channel_layout.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/log.h"
27 #include "libavutil/reverse.h"
28 #include "avcodec.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31
32 #define AES3_HEADER_LEN 4
33
34 typedef struct S302Context {
35 AVClass *class;
36 int non_pcm_mode;
37 } S302Context;
38
39 260 static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
40 int buf_size)
41 {
42 uint32_t h;
43 int frame_size, channels, bits;
44
45
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260 if (buf_size <= AES3_HEADER_LEN) {
46 av_log(avctx, AV_LOG_ERROR, "frame is too short\n");
47 return AVERROR_INVALIDDATA;
48 }
49
50 /*
51 * AES3 header :
52 * size: 16
53 * number channels 2
54 * channel_id 8
55 * bits per samples 2
56 * alignments 4
57 */
58
59 260 h = AV_RB32(buf);
60 260 frame_size = (h >> 16) & 0xffff;
61 260 channels = ((h >> 14) & 0x0003) * 2 + 2;
62 260 bits = ((h >> 4) & 0x0003) * 4 + 16;
63
64
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260 if (AES3_HEADER_LEN + frame_size != buf_size || bits > 24) {
65 1 av_log(avctx, AV_LOG_ERROR, "frame has invalid header\n");
66 1 return AVERROR_INVALIDDATA;
67 }
68
69 /* Set output properties */
70 259 avctx->bits_per_raw_sample = bits;
71
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259 if (bits > 16)
72 avctx->sample_fmt = AV_SAMPLE_FMT_S32;
73 else
74 259 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
75
76 259 av_channel_layout_uninit(&avctx->ch_layout);
77
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259 switch(channels) {
78 259 case 2:
79 259 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
80 259 break;
81 case 4:
82 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD;
83 break;
84 case 6:
85 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1_BACK;
86 break;
87 case 8:
88 av_channel_layout_from_mask(&avctx->ch_layout,
89 AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX);
90 break;
91 default:
92 avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
93 avctx->ch_layout.nb_channels = channels;
94 break;
95 }
96
97 259 return frame_size;
98 }
99
100 260 static int s302m_decode_frame(AVCodecContext *avctx, AVFrame *frame,
101 int *got_frame_ptr, AVPacket *avpkt)
102 {
103 260 S302Context *s = avctx->priv_data;
104 260 const uint8_t *buf = avpkt->data;
105 260 int buf_size = avpkt->size;
106 int block_size, ret, channels;
107 int i;
108 260 int non_pcm_data_type = -1;
109
110 260 int frame_size = s302m_parse_frame_header(avctx, buf, buf_size);
111
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260 if (frame_size < 0)
112 1 return frame_size;
113
114 259 buf_size -= AES3_HEADER_LEN;
115 259 buf += AES3_HEADER_LEN;
116
117 /* get output buffer */
118 259 block_size = (avctx->bits_per_raw_sample + 4) / 4;
119 259 channels = avctx->ch_layout.nb_channels;
120 259 frame->nb_samples = 2 * (buf_size / block_size) / channels;
121
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259 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
122 return ret;
123
124 259 avctx->bit_rate = 48000 * channels * (avctx->bits_per_raw_sample + 4) +
125 259 32 * 48000 / frame->nb_samples;
126 259 buf_size = (frame->nb_samples * channels / 2) * block_size;
127
128
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259 if (avctx->bits_per_raw_sample == 24) {
129 uint32_t *o = (uint32_t *)frame->data[0];
130 for (; buf_size > 6; buf_size -= 7) {
131 *o++ = ((unsigned)ff_reverse[buf[2]] << 24) |
132 (ff_reverse[buf[1]] << 16) |
133 (ff_reverse[buf[0]] << 8);
134 *o++ = ((unsigned)ff_reverse[buf[6] & 0xf0] << 28) |
135 (ff_reverse[buf[5]] << 20) |
136 (ff_reverse[buf[4]] << 12) |
137 (ff_reverse[buf[3] & 0x0f] << 4);
138 buf += 7;
139 }
140 o = (uint32_t *)frame->data[0];
141 if (channels == 2)
142 for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
143 if (o[i] || o[i+1] || o[i+2] || o[i+3])
144 break;
145 if (o[i+4] == 0x96F87200U && o[i+5] == 0xA54E1F00) {
146 non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
147 break;
148 }
149 }
150
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259 } else if (avctx->bits_per_raw_sample == 20) {
151 uint32_t *o = (uint32_t *)frame->data[0];
152 for (; buf_size > 5; buf_size -= 6) {
153 *o++ = ((unsigned)ff_reverse[buf[2] & 0xf0] << 28) |
154 (ff_reverse[buf[1]] << 20) |
155 (ff_reverse[buf[0]] << 12);
156 *o++ = ((unsigned)ff_reverse[buf[5] & 0xf0] << 28) |
157 (ff_reverse[buf[4]] << 20) |
158 (ff_reverse[buf[3]] << 12);
159 buf += 6;
160 }
161 o = (uint32_t *)frame->data[0];
162 if (channels == 2)
163 for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
164 if (o[i] || o[i+1] || o[i+2] || o[i+3])
165 break;
166 if (o[i+4] == 0x6F872000U && o[i+5] == 0x54E1F000) {
167 non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
168 break;
169 }
170 }
171 } else {
172 259 uint16_t *o = (uint16_t *)frame->data[0];
173
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288896 for (; buf_size > 4; buf_size -= 5) {
174 288637 *o++ = (ff_reverse[buf[1]] << 8) |
175 288637 ff_reverse[buf[0]];
176 288637 *o++ = (ff_reverse[buf[4] & 0xf0] << 12) |
177 288637 (ff_reverse[buf[3]] << 4) |
178 288637 (ff_reverse[buf[2]] >> 4);
179 288637 buf += 5;
180 }
181 259 o = (uint16_t *)frame->data[0];
182
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259 if (channels == 2)
183
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259 for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
184
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259 if (o[i] || o[i+1] || o[i+2] || o[i+3])
185 break;
186 if (o[i+4] == 0xF872U && o[i+5] == 0x4E1F) {
187 non_pcm_data_type = (o[i+6] & 0x1F);
188 break;
189 }
190 }
191 }
192
193
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259 if (non_pcm_data_type != -1) {
194 if (s->non_pcm_mode == 3) {
195 av_log(avctx, AV_LOG_ERROR,
196 "S302 non PCM mode with data type %d not supported\n",
197 non_pcm_data_type);
198 return AVERROR_PATCHWELCOME;
199 }
200 if (s->non_pcm_mode & 1) {
201 return avpkt->size;
202 }
203 }
204
205 259 avctx->sample_rate = 48000;
206
207 259 *got_frame_ptr = 1;
208
209 259 return avpkt->size;
210 }
211
212 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_DECODING_PARAM
213 static const AVOption s302m_options[] = {
214 {"non_pcm_mode", "Chooses what to do with NON-PCM", offsetof(S302Context, non_pcm_mode), AV_OPT_TYPE_INT, {.i64 = 3}, 0, 3, FLAGS, "non_pcm_mode"},
215 {"copy" , "Pass NON-PCM through unchanged" , 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 3, FLAGS, "non_pcm_mode"},
216 {"drop" , "Drop NON-PCM" , 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 3, FLAGS, "non_pcm_mode"},
217 {"decode_copy" , "Decode if possible else passthrough", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 3, FLAGS, "non_pcm_mode"},
218 {"decode_drop" , "Decode if possible else drop" , 0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 3, FLAGS, "non_pcm_mode"},
219 {NULL}
220 };
221
222 static const AVClass s302m_class = {
223 .class_name = "SMPTE 302M Decoder",
224 .item_name = av_default_item_name,
225 .option = s302m_options,
226 .version = LIBAVUTIL_VERSION_INT,
227 };
228
229 const FFCodec ff_s302m_decoder = {
230 .p.name = "s302m",
231 CODEC_LONG_NAME("SMPTE 302M"),
232 .p.type = AVMEDIA_TYPE_AUDIO,
233 .p.id = AV_CODEC_ID_S302M,
234 .p.priv_class = &s302m_class,
235 .priv_data_size = sizeof(S302Context),
236 FF_CODEC_DECODE_CB(s302m_decode_frame),
237 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
238 AV_CODEC_CAP_DR1,
239 };
240