FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bitpacked.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 0 55 0.0%
Branches: 0 32 0.0%

Line Branch Exec Source
1 /*
2 * Unpack bit-packed streams to formats supported by FFmpeg
3 * Copyright (c) 2017 Savoir-faire Linux, Inc
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 /* Development sponsored by CBC/Radio-Canada */
23
24 /**
25 * @file
26 * Bitpacked
27 */
28
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "get_bits.h"
32 #include "libavutil/imgutils.h"
33
34 struct BitpackedContext {
35 int (*decode)(AVCodecContext *avctx, AVFrame *frame,
36 const AVPacket *pkt);
37 };
38
39 /* For this format, it's a simple passthrough */
40 static int bitpacked_decode_uyvy422(AVCodecContext *avctx, AVFrame *frame,
41 const AVPacket *avpkt)
42 {
43 int ret;
44
45 /* there is no need to copy as the data already match
46 * a known pixel format */
47 frame->buf[0] = av_buffer_ref(avpkt->buf);
48 ret = av_image_fill_arrays(frame->data, frame->linesize, avpkt->data,
49 avctx->pix_fmt, avctx->width, avctx->height, 1);
50 if (ret < 0) {
51 av_buffer_unref(&frame->buf[0]);
52 return ret;
53 }
54
55 return 0;
56 }
57
58 static int bitpacked_decode_yuv422p10(AVCodecContext *avctx, AVFrame *frame,
59 const AVPacket *avpkt)
60 {
61 uint64_t frame_size = (uint64_t)avctx->width * (uint64_t)avctx->height * 20;
62 uint64_t packet_size = (uint64_t)avpkt->size * 8;
63 GetBitContext bc;
64 uint16_t *y, *u, *v;
65 int ret, i, j;
66
67 ret = ff_get_buffer(avctx, frame, 0);
68 if (ret < 0)
69 return ret;
70
71 if (frame_size > packet_size)
72 return AVERROR_INVALIDDATA;
73
74 if (avctx->width % 2)
75 return AVERROR_PATCHWELCOME;
76
77 ret = init_get_bits(&bc, avpkt->data, avctx->width * avctx->height * 20);
78 if (ret)
79 return ret;
80
81 for (i = 0; i < avctx->height; i++) {
82 y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
83 u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
84 v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);
85
86 for (j = 0; j < avctx->width; j += 2) {
87 *u++ = get_bits(&bc, 10);
88 *y++ = get_bits(&bc, 10);
89 *v++ = get_bits(&bc, 10);
90 *y++ = get_bits(&bc, 10);
91 }
92 }
93
94 return 0;
95 }
96
97 static av_cold int bitpacked_init_decoder(AVCodecContext *avctx)
98 {
99 struct BitpackedContext *bc = avctx->priv_data;
100
101 if (!avctx->codec_tag || !avctx->width || !avctx->height)
102 return AVERROR_INVALIDDATA;
103
104 if (avctx->codec_tag == MKTAG('U', 'Y', 'V', 'Y')) {
105 if (avctx->bits_per_coded_sample == 16 &&
106 avctx->pix_fmt == AV_PIX_FMT_UYVY422)
107 bc->decode = bitpacked_decode_uyvy422;
108 else if (avctx->bits_per_coded_sample == 20 &&
109 avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
110 bc->decode = bitpacked_decode_yuv422p10;
111 else
112 return AVERROR_INVALIDDATA;
113 } else {
114 return AVERROR_INVALIDDATA;
115 }
116
117 return 0;
118 }
119
120 static int bitpacked_decode(AVCodecContext *avctx, void *data, int *got_frame,
121 AVPacket *avpkt)
122 {
123 struct BitpackedContext *bc = avctx->priv_data;
124 int buf_size = avpkt->size;
125 AVFrame *frame = data;
126 int res;
127
128 frame->pict_type = AV_PICTURE_TYPE_I;
129 frame->key_frame = 1;
130
131 res = bc->decode(avctx, frame, avpkt);
132 if (res)
133 return res;
134
135 *got_frame = 1;
136 return buf_size;
137
138 }
139
140 const AVCodec ff_bitpacked_decoder = {
141 .name = "bitpacked",
142 .long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
143 .type = AVMEDIA_TYPE_VIDEO,
144 .id = AV_CODEC_ID_BITPACKED,
145 .priv_data_size = sizeof(struct BitpackedContext),
146 .init = bitpacked_init_decoder,
147 .decode = bitpacked_decode,
148 .capabilities = AV_CODEC_CAP_EXPERIMENTAL,
149 .codec_tags = (const uint32_t []){
150 MKTAG('U', 'Y', 'V', 'Y'),
151 FF_CODEC_TAGS_END,
152 },
153 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
154 };
155