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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * Alias PIX image decoder |
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| 3 | * Copyright (C) 2014 Vittorio Giovara |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" |
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| 23 | |||
| 24 | #include "avcodec.h" |
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| 25 | #include "bytestream.h" |
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| 26 | #include "internal.h" |
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| 27 | |||
| 28 | #define ALIAS_HEADER_SIZE 10 |
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| 29 | |||
| 30 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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| 31 | AVPacket *avpkt) |
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| 32 | { |
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| 33 | AVFrame *f = data; |
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| 34 | GetByteContext gb; |
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| 35 | int width, height, ret, bits_pixel, pixel; |
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| 36 | uint8_t *out_buf; |
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| 37 | uint8_t count; |
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| 38 | int x, y; |
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| 39 | |||
| 40 | bytestream2_init(&gb, avpkt->data, avpkt->size); |
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| 41 | |||
| 42 | if (bytestream2_get_bytes_left(&gb) < ALIAS_HEADER_SIZE) { |
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| 43 | av_log(avctx, AV_LOG_ERROR, "Header too small %d.\n", avpkt->size); |
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| 44 | return AVERROR_INVALIDDATA; |
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| 45 | } |
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| 46 | |||
| 47 | width = bytestream2_get_be16u(&gb); |
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| 48 | height = bytestream2_get_be16u(&gb); |
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| 49 | bytestream2_skipu(&gb, 4); // obsolete X, Y offset |
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| 50 | bits_pixel = bytestream2_get_be16u(&gb); |
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| 51 | |||
| 52 | if (bits_pixel == 24) |
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| 53 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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| 54 | else if (bits_pixel == 8) |
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| 55 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
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| 56 | else { |
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| 57 | av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n"); |
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| 58 | return AVERROR_INVALIDDATA; |
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| 59 | } |
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| 60 | |||
| 61 | ret = ff_set_dimensions(avctx, width, height); |
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| 62 | if (ret < 0) |
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| 63 | return ret; |
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| 64 | |||
| 65 | ret = ff_get_buffer(avctx, f, 0); |
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| 66 | if (ret < 0) |
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| 67 | return ret; |
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| 68 | |||
| 69 | f->pict_type = AV_PICTURE_TYPE_I; |
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| 70 | f->key_frame = 1; |
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| 71 | |||
| 72 | x = 0; |
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| 73 | y = 1; |
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| 74 | out_buf = f->data[0]; |
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| 75 | while (bytestream2_get_bytes_left(&gb) > 0) { |
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| 76 | int i; |
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| 77 | |||
| 78 | /* set buffer at the right position at every new line */ |
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| 79 | if (x == avctx->width) { |
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| 80 | x = 0; |
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| 81 | out_buf = f->data[0] + f->linesize[0] * y++; |
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| 82 | if (y > avctx->height) { |
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| 83 | av_log(avctx, AV_LOG_ERROR, |
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| 84 | "Ended frame decoding with %d bytes left.\n", |
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| 85 | bytestream2_get_bytes_left(&gb)); |
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| 86 | return AVERROR_INVALIDDATA; |
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| 87 | } |
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| 88 | } |
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| 89 | |||
| 90 | /* read packet and copy data */ |
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| 91 | count = bytestream2_get_byteu(&gb); |
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| 92 | if (!count || x + count > avctx->width) { |
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| 93 | av_log(avctx, AV_LOG_ERROR, "Invalid run length %d.\n", count); |
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| 94 | return AVERROR_INVALIDDATA; |
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| 95 | } |
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| 96 | |||
| 97 | if (avctx->pix_fmt == AV_PIX_FMT_BGR24) { |
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| 98 | pixel = bytestream2_get_be24(&gb); |
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| 99 | for (i = 0; i < count; i++) { |
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| 100 | AV_WB24(out_buf, pixel); |
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| 101 | out_buf += 3; |
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| 102 | } |
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| 103 | } else { // AV_PIX_FMT_GRAY8 |
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| 104 | pixel = bytestream2_get_byte(&gb); |
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| 105 | for (i = 0; i < count; i++) |
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| 106 | *out_buf++ = pixel; |
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| 107 | } |
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| 108 | |||
| 109 | x += i; |
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| 110 | } |
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| 111 | |||
| 112 | if (x != width || y != height) { |
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| 113 | av_log(avctx, AV_LOG_ERROR, "Picture stopped at %d,%d.\n", x, y); |
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| 114 | return AVERROR_INVALIDDATA; |
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| 115 | } |
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| 116 | |||
| 117 | *got_frame = 1; |
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| 118 | return avpkt->size; |
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| 119 | } |
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| 120 | |||
| 121 | AVCodec ff_alias_pix_decoder = { |
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| 122 | .name = "alias_pix", |
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| 123 | .long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"), |
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| 124 | .type = AVMEDIA_TYPE_VIDEO, |
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| 125 | .id = AV_CODEC_ID_ALIAS_PIX, |
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| 126 | .decode = decode_frame, |
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| 127 | .capabilities = AV_CODEC_CAP_DR1, |
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| 128 | }; |