Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Forward Uncompressed |
||
| 3 | * |
||
| 4 | * Copyright (c) 2009 Reimar Döffinger |
||
| 5 | * |
||
| 6 | * This file is part of FFmpeg. |
||
| 7 | * |
||
| 8 | * FFmpeg is free software; you can redistribute it and/or |
||
| 9 | * modify it under the terms of the GNU Lesser General Public |
||
| 10 | * License as published by the Free Software Foundation; either |
||
| 11 | * version 2.1 of the License, or (at your option) any later version. |
||
| 12 | * |
||
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||
| 16 | * Lesser General Public License for more details. |
||
| 17 | * |
||
| 18 | * You should have received a copy of the GNU Lesser General Public |
||
| 19 | * License along with FFmpeg; if not, write to the Free Software |
||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||
| 21 | */ |
||
| 22 | |||
| 23 | #include "avcodec.h" |
||
| 24 | #include "bytestream.h" |
||
| 25 | #include "internal.h" |
||
| 26 | #include "libavutil/opt.h" |
||
| 27 | |||
| 28 | typedef struct { |
||
| 29 | AVClass *av_class; |
||
| 30 | int change_field_order; |
||
| 31 | } FRWUContext; |
||
| 32 | |||
| 33 | static av_cold int decode_init(AVCodecContext *avctx) |
||
| 34 | { |
||
| 35 | if (avctx->width & 1) { |
||
| 36 | av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n"); |
||
| 37 | return AVERROR(EINVAL); |
||
| 38 | } |
||
| 39 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
||
| 40 | |||
| 41 | return 0; |
||
| 42 | } |
||
| 43 | |||
| 44 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
||
| 45 | AVPacket *avpkt) |
||
| 46 | { |
||
| 47 | FRWUContext *s = avctx->priv_data; |
||
| 48 | int field, ret; |
||
| 49 | AVFrame *pic = data; |
||
| 50 | const uint8_t *buf = avpkt->data; |
||
| 51 | const uint8_t *buf_end = buf + avpkt->size; |
||
| 52 | |||
| 53 | if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) { |
||
| 54 | av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n"); |
||
| 55 | return AVERROR_INVALIDDATA; |
||
| 56 | } |
||
| 57 | if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) { |
||
| 58 | av_log(avctx, AV_LOG_ERROR, "incorrect marker\n"); |
||
| 59 | return AVERROR_INVALIDDATA; |
||
| 60 | } |
||
| 61 | |||
| 62 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
||
| 63 | return ret; |
||
| 64 | |||
| 65 | pic->pict_type = AV_PICTURE_TYPE_I; |
||
| 66 | pic->key_frame = 1; |
||
| 67 | |||
| 68 | for (field = 0; field < 2; field++) { |
||
| 69 | int i; |
||
| 70 | int field_h = (avctx->height + !field) >> 1; |
||
| 71 | int field_size, min_field_size = avctx->width * 2 * field_h; |
||
| 72 | uint8_t *dst = pic->data[0]; |
||
| 73 | if (buf_end - buf < 8) |
||
| 74 | return AVERROR_INVALIDDATA; |
||
| 75 | buf += 4; // flags? 0x80 == bottom field maybe? |
||
| 76 | field_size = bytestream_get_le32(&buf); |
||
| 77 | if (field_size < min_field_size) { |
||
| 78 | av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size); |
||
| 79 | return AVERROR_INVALIDDATA; |
||
| 80 | } |
||
| 81 | if (buf_end - buf < field_size) { |
||
| 82 | av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf)); |
||
| 83 | return AVERROR_INVALIDDATA; |
||
| 84 | } |
||
| 85 | if (field ^ s->change_field_order) { |
||
| 86 | dst += pic->linesize[0]; |
||
| 87 | } else if (s->change_field_order) { |
||
| 88 | dst += 2 * pic->linesize[0]; |
||
| 89 | } |
||
| 90 | for (i = 0; i < field_h; i++) { |
||
| 91 | if (s->change_field_order && field && i == field_h - 1) |
||
| 92 | dst = pic->data[0]; |
||
| 93 | memcpy(dst, buf, avctx->width * 2); |
||
| 94 | buf += avctx->width * 2; |
||
| 95 | dst += pic->linesize[0] << 1; |
||
| 96 | } |
||
| 97 | buf += field_size - min_field_size; |
||
| 98 | } |
||
| 99 | |||
| 100 | *got_frame = 1; |
||
| 101 | |||
| 102 | return avpkt->size; |
||
| 103 | } |
||
| 104 | |||
| 105 | static const AVOption frwu_options[] = { |
||
| 106 | {"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), FF_OPT_TYPE_INT, |
||
| 107 | {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM}, |
||
| 108 | {NULL} |
||
| 109 | }; |
||
| 110 | |||
| 111 | static const AVClass frwu_class = { |
||
| 112 | .class_name = "frwu Decoder", |
||
| 113 | .item_name = av_default_item_name, |
||
| 114 | .option = frwu_options, |
||
| 115 | .version = LIBAVUTIL_VERSION_INT, |
||
| 116 | }; |
||
| 117 | |||
| 118 | AVCodec ff_frwu_decoder = { |
||
| 119 | .name = "frwu", |
||
| 120 | .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), |
||
| 121 | .type = AVMEDIA_TYPE_VIDEO, |
||
| 122 | .id = AV_CODEC_ID_FRWU, |
||
| 123 | .priv_data_size = sizeof(FRWUContext), |
||
| 124 | .init = decode_init, |
||
| 125 | .decode = decode_frame, |
||
| 126 | .capabilities = CODEC_CAP_DR1, |
||
| 127 | .priv_class = &frwu_class, |
||
| 128 | }; |