|
| 1 | +/** |
| 2 | + * @file video_decompress/i420.c |
| 3 | + * @author Martin Pulec <pulec@cesnet.cz> |
| 4 | + * |
| 5 | + * implementation of I420->UYVY "decompression", because for the planar |
| 6 | + * format there is no line decoder and when the display iw unable to display |
| 7 | + * I420 directly, it is not possible to present it. |
| 8 | + * |
| 9 | + * As this is implementation is quite short, it can also hold as a decompress |
| 10 | + * module template. |
| 11 | + */ |
| 12 | +/* |
| 13 | + * Copyright (c) 2024 CESNET z.s.p.o. |
| 14 | + * All rights reserved. |
| 15 | + * |
| 16 | + * Redistribution and use in source and binary forms, with or without |
| 17 | + * modification, is permitted provided that the following conditions |
| 18 | + * are met: |
| 19 | + * |
| 20 | + * 1. Redistributions of source code must retain the above copyright |
| 21 | + * notice, this list of conditions and the following disclaimer. |
| 22 | + * |
| 23 | + * 2. Redistributions in binary form must reproduce the above copyright |
| 24 | + * notice, this list of conditions and the following disclaimer in the |
| 25 | + * documentation and/or other materials provided with the distribution. |
| 26 | + * |
| 27 | + * 3. Neither the name of CESNET nor the names of its contributors may be |
| 28 | + * used to endorse or promote products derived from this software without |
| 29 | + * specific prior written permission. |
| 30 | + * |
| 31 | + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS |
| 32 | + * "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, |
| 33 | + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| 34 | + * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 35 | + * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| 36 | + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 37 | + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 38 | + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 39 | + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 40 | + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 41 | + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
| 42 | + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 43 | + */ |
| 44 | + |
| 45 | +#include <assert.h> |
| 46 | +#include <stdbool.h> |
| 47 | +#include <stdlib.h> |
| 48 | + |
| 49 | +#include "lib_common.h" |
| 50 | +#include "types.h" |
| 51 | +#include "video_codec.h" |
| 52 | +#include "video_decompress.h" |
| 53 | + |
| 54 | +struct i420_decompress_state { |
| 55 | + struct video_desc desc; |
| 56 | +}; |
| 57 | + |
| 58 | +static void * |
| 59 | +i420_decompress_init(void) |
| 60 | +{ |
| 61 | + return malloc(sizeof(struct i420_decompress_state)); |
| 62 | +} |
| 63 | + |
| 64 | +static int |
| 65 | +i420_decompress_reconfigure(void *state, struct video_desc desc, int rshift, |
| 66 | + int gshift, int bshift, int pitch, |
| 67 | + codec_t out_codec) |
| 68 | +{ |
| 69 | + (void) rshift, (void) gshift, (void) bshift; |
| 70 | + assert(out_codec == UYVY); |
| 71 | + assert(pitch == (int) desc.width * 2); // implement other ir needed |
| 72 | + struct i420_decompress_state *s = state; |
| 73 | + s->desc = desc; |
| 74 | + return true; |
| 75 | +} |
| 76 | + |
| 77 | +static decompress_status |
| 78 | +i420_decompress(void *state, unsigned char *dst, unsigned char *buffer, |
| 79 | + unsigned int src_len, int frame_seq, |
| 80 | + struct video_frame_callbacks *callbacks, |
| 81 | + struct pixfmt_desc *internal_prop) |
| 82 | +{ |
| 83 | + (void) src_len, (void) frame_seq, (void) callbacks, |
| 84 | + (void) internal_prop; |
| 85 | + struct i420_decompress_state *s = state; |
| 86 | + i420_8_to_uyvy((int) s->desc.width, (int) s->desc.height, buffer, dst); |
| 87 | + return DECODER_GOT_FRAME; |
| 88 | +} |
| 89 | + |
| 90 | +static int |
| 91 | +i420_decompress_get_property(void *state, int property, void *val, size_t *len) |
| 92 | +{ |
| 93 | + (void) state; |
| 94 | + |
| 95 | + if (property == DECOMPRESS_PROPERTY_ACCEPTS_CORRUPTED_FRAME) { |
| 96 | + assert(*len >= sizeof(int)); |
| 97 | + *(int *) val = true; |
| 98 | + *len = sizeof(int); |
| 99 | + return true; |
| 100 | + } |
| 101 | + return false; |
| 102 | +} |
| 103 | + |
| 104 | +static void |
| 105 | +i420_decompress_done(void *state) |
| 106 | +{ |
| 107 | + free(state); |
| 108 | +} |
| 109 | + |
| 110 | +static int |
| 111 | +i420_decompress_get_priority(codec_t compression, struct pixfmt_desc internal, |
| 112 | + codec_t ugc) |
| 113 | +{ |
| 114 | + (void) internal; |
| 115 | + enum { |
| 116 | + PRIO_NA = -1, |
| 117 | + PRIO_NORMAL = 500, |
| 118 | + }; |
| 119 | + // probing (ugc==VC_NONE) is skipped (optional, not necessary) |
| 120 | + return compression == I420 && ugc == UYVY ? PRIO_NORMAL : PRIO_NA; |
| 121 | +} |
| 122 | + |
| 123 | +static const struct video_decompress_info i420_info = { |
| 124 | + i420_decompress_init, i420_decompress_reconfigure, |
| 125 | + i420_decompress, i420_decompress_get_property, |
| 126 | + i420_decompress_done, i420_decompress_get_priority, |
| 127 | +}; |
| 128 | + |
| 129 | +REGISTER_MODULE(i420, &i420_info, LIBRARY_CLASS_VIDEO_DECOMPRESS, |
| 130 | + VIDEO_DECOMPRESS_ABI_VERSION); |
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