| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Alias PIX image decoder | ||
| 3 | * Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com> | ||
| 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 | #include "libavutil/intreadwrite.h" | ||
| 23 | |||
| 24 | #include "avcodec.h" | ||
| 25 | #include "bytestream.h" | ||
| 26 | #include "codec_internal.h" | ||
| 27 | #include "decode.h" | ||
| 28 | |||
| 29 | #define ALIAS_HEADER_SIZE 10 | ||
| 30 | |||
| 31 | 8 | static int decode_frame(AVCodecContext *avctx, AVFrame *f, | |
| 32 | int *got_frame, AVPacket *avpkt) | ||
| 33 | { | ||
| 34 | GetByteContext gb; | ||
| 35 | int width, height, ret, bits_pixel, pixel; | ||
| 36 | uint8_t *out_buf; | ||
| 37 | uint8_t count; | ||
| 38 | int x, y; | ||
| 39 | |||
| 40 | 8 | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
| 41 | |||
| 42 |
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8 | if (bytestream2_get_bytes_left(&gb) < ALIAS_HEADER_SIZE) { |
| 43 | ✗ | av_log(avctx, AV_LOG_ERROR, "Header too small %d.\n", avpkt->size); | |
| 44 | ✗ | return AVERROR_INVALIDDATA; | |
| 45 | } | ||
| 46 | |||
| 47 | 8 | width = bytestream2_get_be16u(&gb); | |
| 48 | 8 | height = bytestream2_get_be16u(&gb); | |
| 49 | 8 | bytestream2_skipu(&gb, 4); // obsolete X, Y offset | |
| 50 | 8 | bits_pixel = bytestream2_get_be16u(&gb); | |
| 51 | |||
| 52 |
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8 | if (bits_pixel == 24) |
| 53 | 4 | avctx->pix_fmt = AV_PIX_FMT_BGR24; | |
| 54 |
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4 | else if (bits_pixel == 8) |
| 55 | 4 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; | |
| 56 | else { | ||
| 57 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n"); | |
| 58 | ✗ | return AVERROR_INVALIDDATA; | |
| 59 | } | ||
| 60 | |||
| 61 | 8 | ret = ff_set_dimensions(avctx, width, height); | |
| 62 |
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8 | if (ret < 0) |
| 63 | ✗ | return ret; | |
| 64 | |||
| 65 |
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8 | if (bytestream2_get_bytes_left(&gb) < width*height / 255) |
| 66 | ✗ | return AVERROR_INVALIDDATA; | |
| 67 | |||
| 68 | 8 | ret = ff_get_buffer(avctx, f, 0); | |
| 69 |
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8 | if (ret < 0) |
| 70 | ✗ | return ret; | |
| 71 | |||
| 72 | 8 | f->pict_type = AV_PICTURE_TYPE_I; | |
| 73 | 8 | f->flags |= AV_FRAME_FLAG_KEY; | |
| 74 | |||
| 75 | 8 | x = 0; | |
| 76 | 8 | y = 1; | |
| 77 | 8 | out_buf = f->data[0]; | |
| 78 |
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120804 | while (bytestream2_get_bytes_left(&gb) > 0) { |
| 79 | int i; | ||
| 80 | |||
| 81 | /* set buffer at the right position at every new line */ | ||
| 82 |
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120796 | if (x == avctx->width) { |
| 83 | 632 | x = 0; | |
| 84 | 632 | out_buf = f->data[0] + f->linesize[0] * y++; | |
| 85 |
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632 | if (y > avctx->height) { |
| 86 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
| 87 | "Ended frame decoding with %d bytes left.\n", | ||
| 88 | bytestream2_get_bytes_left(&gb)); | ||
| 89 | ✗ | return AVERROR_INVALIDDATA; | |
| 90 | } | ||
| 91 | } | ||
| 92 | |||
| 93 | /* read packet and copy data */ | ||
| 94 | 120796 | count = bytestream2_get_byteu(&gb); | |
| 95 |
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120796 | if (!count || x + count > avctx->width) { |
| 96 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid run length %d.\n", count); | |
| 97 | ✗ | return AVERROR_INVALIDDATA; | |
| 98 | } | ||
| 99 | |||
| 100 |
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120796 | if (avctx->pix_fmt == AV_PIX_FMT_BGR24) { |
| 101 | 63080 | pixel = bytestream2_get_be24(&gb); | |
| 102 |
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126596 | for (i = 0; i < count; i++) { |
| 103 | 63516 | AV_WB24(out_buf, pixel); | |
| 104 | 63516 | out_buf += 3; | |
| 105 | } | ||
| 106 | } else { // AV_PIX_FMT_GRAY8 | ||
| 107 | 57716 | pixel = bytestream2_get_byte(&gb); | |
| 108 |
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122192 | for (i = 0; i < count; i++) |
| 109 | 64476 | *out_buf++ = pixel; | |
| 110 | } | ||
| 111 | |||
| 112 | 120796 | x += i; | |
| 113 | } | ||
| 114 | |||
| 115 |
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8 | if (x != width || y != height) { |
| 116 | ✗ | av_log(avctx, AV_LOG_ERROR, "Picture stopped at %d,%d.\n", x, y); | |
| 117 | ✗ | return AVERROR_INVALIDDATA; | |
| 118 | } | ||
| 119 | |||
| 120 | 8 | *got_frame = 1; | |
| 121 | 8 | return avpkt->size; | |
| 122 | } | ||
| 123 | |||
| 124 | const FFCodec ff_alias_pix_decoder = { | ||
| 125 | .p.name = "alias_pix", | ||
| 126 | CODEC_LONG_NAME("Alias/Wavefront PIX image"), | ||
| 127 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 128 | .p.id = AV_CODEC_ID_ALIAS_PIX, | ||
| 129 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 130 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 131 | }; | ||
| 132 |