GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/s302m.c Lines: 53 106 50.0 %
Date: 2020-09-25 14:59:26 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/intreadwrite.h"
24
#include "libavutil/opt.h"
25
#include "libavutil/log.h"
26
#include "avcodec.h"
27
#include "internal.h"
28
#include "mathops.h"
29
30
#define AES3_HEADER_LEN 4
31
32
typedef struct S302Context {
33
    AVClass *class;
34
    int non_pcm_mode;
35
} S302Context;
36
37
260
static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
38
                                    int buf_size)
39
{
40
    uint32_t h;
41
    int frame_size, channels, bits;
42
43
260
    if (buf_size <= AES3_HEADER_LEN) {
44
        av_log(avctx, AV_LOG_ERROR, "frame is too short\n");
45
        return AVERROR_INVALIDDATA;
46
    }
47
48
    /*
49
     * AES3 header :
50
     * size:            16
51
     * number channels   2
52
     * channel_id        8
53
     * bits per samples  2
54
     * alignments        4
55
     */
56
57
260
    h = AV_RB32(buf);
58
260
    frame_size =  (h >> 16) & 0xffff;
59
260
    channels   = ((h >> 14) & 0x0003) * 2 +  2;
60
260
    bits       = ((h >>  4) & 0x0003) * 4 + 16;
61
62

260
    if (AES3_HEADER_LEN + frame_size != buf_size || bits > 24) {
63
1
        av_log(avctx, AV_LOG_ERROR, "frame has invalid header\n");
64
1
        return AVERROR_INVALIDDATA;
65
    }
66
67
    /* Set output properties */
68
259
    avctx->bits_per_raw_sample = bits;
69
259
    if (bits > 16)
70
        avctx->sample_fmt = AV_SAMPLE_FMT_S32;
71
    else
72
259
        avctx->sample_fmt = AV_SAMPLE_FMT_S16;
73
74
259
    avctx->channels    = channels;
75

259
    switch(channels) {
76
259
        case 2:
77
259
            avctx->channel_layout = AV_CH_LAYOUT_STEREO;
78
259
            break;
79
        case 4:
80
            avctx->channel_layout = AV_CH_LAYOUT_QUAD;
81
            break;
82
        case 6:
83
            avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK;
84
            break;
85
        case 8:
86
            avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX;
87
    }
88
89
259
    return frame_size;
90
}
91
92
260
static int s302m_decode_frame(AVCodecContext *avctx, void *data,
93
                              int *got_frame_ptr, AVPacket *avpkt)
94
{
95
260
    S302Context *s = avctx->priv_data;
96
260
    AVFrame *frame     = data;
97
260
    const uint8_t *buf = avpkt->data;
98
260
    int buf_size       = avpkt->size;
99
    int block_size, ret;
100
    int i;
101
260
    int non_pcm_data_type = -1;
102
103
260
    int frame_size = s302m_parse_frame_header(avctx, buf, buf_size);
104
260
    if (frame_size < 0)
105
1
        return frame_size;
106
107
259
    buf_size -= AES3_HEADER_LEN;
108
259
    buf      += AES3_HEADER_LEN;
109
110
    /* get output buffer */
111
259
    block_size = (avctx->bits_per_raw_sample + 4) / 4;
112
259
    frame->nb_samples = 2 * (buf_size / block_size) / avctx->channels;
113
259
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
114
        return ret;
115
116
259
    avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_raw_sample + 4) +
117
259
                      32 * 48000 / frame->nb_samples;
118
259
    buf_size = (frame->nb_samples * avctx->channels / 2) * block_size;
119
120
259
    if (avctx->bits_per_raw_sample == 24) {
121
        uint32_t *o = (uint32_t *)frame->data[0];
122
        for (; buf_size > 6; buf_size -= 7) {
123
            *o++ = ((unsigned)ff_reverse[buf[2]]        << 24) |
124
                   (ff_reverse[buf[1]]        << 16) |
125
                   (ff_reverse[buf[0]]        <<  8);
126
            *o++ = ((unsigned)ff_reverse[buf[6] & 0xf0] << 28) |
127
                   (ff_reverse[buf[5]]        << 20) |
128
                   (ff_reverse[buf[4]]        << 12) |
129
                   (ff_reverse[buf[3] & 0x0f] <<  4);
130
            buf += 7;
131
        }
132
        o = (uint32_t *)frame->data[0];
133
        if (avctx->channels == 2)
134
            for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
135
                if (o[i] || o[i+1] || o[i+2] || o[i+3])
136
                    break;
137
                if (o[i+4] == 0x96F87200U && o[i+5] == 0xA54E1F00) {
138
                    non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
139
                    break;
140
                }
141
            }
142
259
    } else if (avctx->bits_per_raw_sample == 20) {
143
        uint32_t *o = (uint32_t *)frame->data[0];
144
        for (; buf_size > 5; buf_size -= 6) {
145
            *o++ = ((unsigned)ff_reverse[buf[2] & 0xf0] << 28) |
146
                   (ff_reverse[buf[1]]        << 20) |
147
                   (ff_reverse[buf[0]]        << 12);
148
            *o++ = ((unsigned)ff_reverse[buf[5] & 0xf0] << 28) |
149
                   (ff_reverse[buf[4]]        << 20) |
150
                   (ff_reverse[buf[3]]        << 12);
151
            buf += 6;
152
        }
153
        o = (uint32_t *)frame->data[0];
154
        if (avctx->channels == 2)
155
            for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
156
                if (o[i] || o[i+1] || o[i+2] || o[i+3])
157
                    break;
158
                if (o[i+4] == 0x6F872000U && o[i+5] == 0x54E1F000) {
159
                    non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
160
                    break;
161
                }
162
            }
163
    } else {
164
259
        uint16_t *o = (uint16_t *)frame->data[0];
165
288896
        for (; buf_size > 4; buf_size -= 5) {
166
288637
            *o++ = (ff_reverse[buf[1]]        <<  8) |
167
288637
                    ff_reverse[buf[0]];
168
288637
            *o++ = (ff_reverse[buf[4] & 0xf0] << 12) |
169
288637
                   (ff_reverse[buf[3]]        <<  4) |
170
288637
                   (ff_reverse[buf[2]]        >>  4);
171
288637
            buf += 5;
172
        }
173
259
        o = (uint16_t *)frame->data[0];
174
259
        if (avctx->channels == 2)
175
259
            for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
176


259
                if (o[i] || o[i+1] || o[i+2] || o[i+3])
177
                    break;
178
                if (o[i+4] == 0xF872U && o[i+5] == 0x4E1F) {
179
                    non_pcm_data_type = (o[i+6] & 0x1F);
180
                    break;
181
                }
182
            }
183
    }
184
185
259
    if (non_pcm_data_type != -1) {
186
        if (s->non_pcm_mode == 3) {
187
            av_log(avctx, AV_LOG_ERROR,
188
                   "S302 non PCM mode with data type %d not supported\n",
189
                   non_pcm_data_type);
190
            return AVERROR_PATCHWELCOME;
191
        }
192
        if (s->non_pcm_mode & 1) {
193
            return avpkt->size;
194
        }
195
    }
196
197
259
    avctx->sample_rate = 48000;
198
199
259
    *got_frame_ptr = 1;
200
201
259
    return avpkt->size;
202
}
203
204
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_DECODING_PARAM
205
static const AVOption s302m_options[] = {
206
    {"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"},
207
    {"copy"        , "Pass NON-PCM through unchanged"     , 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 3, FLAGS, "non_pcm_mode"},
208
    {"drop"        , "Drop NON-PCM"                       , 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 3, FLAGS, "non_pcm_mode"},
209
    {"decode_copy" , "Decode if possible else passthrough", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 3, FLAGS, "non_pcm_mode"},
210
    {"decode_drop" , "Decode if possible else drop"       , 0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 3, FLAGS, "non_pcm_mode"},
211
    {NULL}
212
};
213
214
static const AVClass s302m_class = {
215
    .class_name = "SMPTE 302M Decoder",
216
    .item_name  = av_default_item_name,
217
    .option     = s302m_options,
218
    .version    = LIBAVUTIL_VERSION_INT,
219
};
220
221
AVCodec ff_s302m_decoder = {
222
    .name           = "s302m",
223
    .long_name      = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
224
    .type           = AVMEDIA_TYPE_AUDIO,
225
    .id             = AV_CODEC_ID_S302M,
226
    .priv_data_size = sizeof(S302Context),
227
    .decode         = s302m_decode_frame,
228
    .capabilities   = AV_CODEC_CAP_DR1,
229
    .priv_class     = &s302m_class,
230
};