| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Winnov WNV1 codec | ||
| 3 | * Copyright (c) 2005 Konstantin Shishkov | ||
| 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 | * Winnov WNV1 codec. | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/thread.h" | ||
| 28 | |||
| 29 | #define BITSTREAM_READER_LE | ||
| 30 | #include "avcodec.h" | ||
| 31 | #include "codec_internal.h" | ||
| 32 | #include "decode.h" | ||
| 33 | #include "get_bits.h" | ||
| 34 | |||
| 35 | static const uint8_t code_tab[16][2] = { | ||
| 36 | { 7, 1 }, { 8, 3 }, { 6, 3 }, { 9, 4 }, { 5, 4 }, { 10, 5 }, { 4, 5 }, | ||
| 37 | { 11, 6 }, { 3, 6 }, { 12, 7 }, { 2, 7 }, { 13, 8 }, { 1, 8 }, { 14, 9 }, | ||
| 38 | { 0, 9 }, { 15, 8 } | ||
| 39 | }; | ||
| 40 | |||
| 41 | #define CODE_VLC_BITS 9 | ||
| 42 | static VLCElem code_vlc[1 << CODE_VLC_BITS]; | ||
| 43 | |||
| 44 | /* returns modified base_value */ | ||
| 45 | 3302400 | static inline int wnv1_get_code(GetBitContext *gb, int shift, int base_value) | |
| 46 | { | ||
| 47 | 3302400 | int v = get_vlc2(gb, code_vlc, CODE_VLC_BITS, 1); | |
| 48 | |||
| 49 |
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3302400 | if (v == 8) |
| 50 | 70676 | return get_bits(gb, 8 - shift) << shift; | |
| 51 | else | ||
| 52 | 3231724 | return base_value + v * (1 << shift); | |
| 53 | } | ||
| 54 | |||
| 55 | 86 | static int decode_frame(AVCodecContext *avctx, AVFrame *p, | |
| 56 | int *got_frame, AVPacket *avpkt) | ||
| 57 | { | ||
| 58 | 86 | const uint8_t *buf = avpkt->data; | |
| 59 | 86 | int buf_size = avpkt->size; | |
| 60 | GetBitContext gb; | ||
| 61 | unsigned char *Y,*U,*V; | ||
| 62 | int i, j, ret, shift; | ||
| 63 | 86 | int prev_y = 0, prev_u = 0, prev_v = 0; | |
| 64 | |||
| 65 |
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86 | if (buf_size < 8 + avctx->height * (avctx->width/2)/8) { |
| 66 | ✗ | av_log(avctx, AV_LOG_ERROR, "Packet size %d is too small\n", buf_size); | |
| 67 | ✗ | return AVERROR_INVALIDDATA; | |
| 68 | } | ||
| 69 | |||
| 70 |
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86 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 71 | ✗ | return ret; | |
| 72 | 86 | p->flags |= AV_FRAME_FLAG_KEY; | |
| 73 | |||
| 74 |
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86 | if ((ret = init_get_bits8(&gb, buf + 8, buf_size - 8)) < 0) |
| 75 | ✗ | return ret; | |
| 76 | |||
| 77 |
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86 | if (buf[2] >> 4 == 6) |
| 78 | 86 | shift = 2; | |
| 79 | else { | ||
| 80 | ✗ | shift = 8 - (buf[2] >> 4); | |
| 81 | ✗ | if (shift > 4) { | |
| 82 | ✗ | avpriv_request_sample(avctx, | |
| 83 | "Unknown WNV1 frame header value %i", | ||
| 84 | ✗ | buf[2] >> 4); | |
| 85 | ✗ | shift = 4; | |
| 86 | } | ||
| 87 | ✗ | if (shift < 1) { | |
| 88 | ✗ | avpriv_request_sample(avctx, | |
| 89 | "Unknown WNV1 frame header value %i", | ||
| 90 | ✗ | buf[2] >> 4); | |
| 91 | ✗ | shift = 1; | |
| 92 | } | ||
| 93 | } | ||
| 94 | |||
| 95 | 86 | Y = p->data[0]; | |
| 96 | 86 | U = p->data[1]; | |
| 97 | 86 | V = p->data[2]; | |
| 98 |
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10406 | for (j = 0; j < avctx->height; j++) { |
| 99 |
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835920 | for (i = 0; i < avctx->width / 2; i++) { |
| 100 | 825600 | Y[i * 2] = wnv1_get_code(&gb, shift, prev_y); | |
| 101 | 825600 | prev_u = U[i] = wnv1_get_code(&gb, shift, prev_u); | |
| 102 | 825600 | prev_y = Y[(i * 2) + 1] = wnv1_get_code(&gb, shift, Y[i * 2]); | |
| 103 | 825600 | prev_v = V[i] = wnv1_get_code(&gb, shift, prev_v); | |
| 104 | } | ||
| 105 | 10320 | Y += p->linesize[0]; | |
| 106 | 10320 | U += p->linesize[1]; | |
| 107 | 10320 | V += p->linesize[2]; | |
| 108 | } | ||
| 109 | |||
| 110 | |||
| 111 | 86 | *got_frame = 1; | |
| 112 | |||
| 113 | 86 | return buf_size; | |
| 114 | } | ||
| 115 | |||
| 116 | 1 | static av_cold void wnv1_init_static(void) | |
| 117 | { | ||
| 118 | 1 | VLC_INIT_STATIC_TABLE_FROM_LENGTHS(code_vlc, CODE_VLC_BITS, 16, | |
| 119 | &code_tab[0][1], 2, | ||
| 120 | &code_tab[0][0], 2, 1, | ||
| 121 | -7, VLC_INIT_OUTPUT_LE); | ||
| 122 | 1 | } | |
| 123 | |||
| 124 | 2 | static av_cold int decode_init(AVCodecContext *avctx) | |
| 125 | { | ||
| 126 | static AVOnce init_static_once = AV_ONCE_INIT; | ||
| 127 | |||
| 128 |
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2 | if (avctx->width <= 1) |
| 129 | ✗ | return AVERROR_INVALIDDATA; | |
| 130 | |||
| 131 | 2 | avctx->pix_fmt = AV_PIX_FMT_YUV422P; | |
| 132 | |||
| 133 | 2 | ff_thread_once(&init_static_once, wnv1_init_static); | |
| 134 | |||
| 135 | 2 | return 0; | |
| 136 | } | ||
| 137 | |||
| 138 | const FFCodec ff_wnv1_decoder = { | ||
| 139 | .p.name = "wnv1", | ||
| 140 | CODEC_LONG_NAME("Winnov WNV1"), | ||
| 141 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 142 | .p.id = AV_CODEC_ID_WNV1, | ||
| 143 | .init = decode_init, | ||
| 144 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 145 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 146 | }; | ||
| 147 |