| 1 | /* |
| 2 | * AVRn decoder |
| 3 | * Copyright (c) 2012 Michael Niedermayer |
| 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 "avcodec.h" |
| 23 | #include "internal.h" |
| 24 | #include "mjpeg.h" |
| 25 | #include "mjpegdec.h" |
| 26 | #include "libavutil/imgutils.h" |
| 27 | |
| 28 | typedef struct { |
| 29 | MJpegDecodeContext mjpeg_ctx; |
| 30 | int is_mjpeg; |
| 31 | int interlace; //FIXME use frame.interlaced_frame |
| 32 | int tff; |
| 33 | } AVRnContext; |
| 34 | |
| 35 | static av_cold int init(AVCodecContext *avctx) |
| 36 | { |
| 37 | AVRnContext *a = avctx->priv_data; |
| 38 | int ret; |
| 39 | |
| 40 | // Support "Resolution 1:1" for Avid AVI Codec |
| 41 | a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3); |
| 42 | |
| 43 | if(!a->is_mjpeg && avctx->lowres) { |
| 44 | av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n"); |
| 45 | return AVERROR(EINVAL); |
| 46 | } |
| 47 | |
| 48 | if(a->is_mjpeg) |
| 49 | return ff_mjpeg_decode_init(avctx); |
| 50 | |
| 51 | if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) |
| 52 | return ret; |
| 53 | |
| 54 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
| 55 | |
| 56 | if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) { |
| 57 | int ndx = avctx->extradata[4] + 4; |
| 58 | a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4); |
| 59 | if(a->interlace) { |
| 60 | a->tff = avctx->extradata[ndx + 24] == 1; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static av_cold int end(AVCodecContext *avctx) |
| 68 | { |
| 69 | AVRnContext *a = avctx->priv_data; |
| 70 | |
| 71 | if(a->is_mjpeg) |
| 72 | ff_mjpeg_decode_end(avctx); |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static int decode_frame(AVCodecContext *avctx, void *data, |
| 78 | int *got_frame, AVPacket *avpkt) |
| 79 | { |
| 80 | AVRnContext *a = avctx->priv_data; |
| 81 | AVFrame *p = data; |
| 82 | const uint8_t *buf = avpkt->data; |
| 83 | int buf_size = avpkt->size; |
| 84 | int y, ret, true_height; |
| 85 | |
| 86 | if(a->is_mjpeg) |
| 87 | return ff_mjpeg_decode_frame(avctx, data, got_frame, avpkt); |
| 88 | |
| 89 | true_height = buf_size / (2*avctx->width); |
| 90 | |
| 91 | if(buf_size < 2*avctx->width * avctx->height) { |
| 92 | av_log(avctx, AV_LOG_ERROR, "packet too small\n"); |
| 93 | return AVERROR_INVALIDDATA; |
| 94 | } |
| 95 | |
| 96 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 97 | return ret; |
| 98 | p->pict_type= AV_PICTURE_TYPE_I; |
| 99 | p->key_frame= 1; |
| 100 | |
| 101 | if(a->interlace) { |
| 102 | buf += (true_height - avctx->height)*avctx->width; |
| 103 | for(y = 0; y < avctx->height-1; y+=2) { |
| 104 | memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width); |
| 105 | memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width); |
| 106 | buf += 2*avctx->width; |
| 107 | } |
| 108 | } else { |
| 109 | buf += (true_height - avctx->height)*avctx->width*2; |
| 110 | for(y = 0; y < avctx->height; y++) { |
| 111 | memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width); |
| 112 | buf += 2*avctx->width; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | *got_frame = 1; |
| 117 | return buf_size; |
| 118 | } |
| 119 | |
| 120 | AVCodec ff_avrn_decoder = { |
| 121 | .name = "avrn", |
| 122 | .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"), |
| 123 | .type = AVMEDIA_TYPE_VIDEO, |
| 124 | .id = AV_CODEC_ID_AVRN, |
| 125 | .priv_data_size = sizeof(AVRnContext), |
| 126 | .init = init, |
| 127 | .close = end, |
| 128 | .decode = decode_frame, |
| 129 | .capabilities = CODEC_CAP_DR1, |
| 130 | .max_lowres = 3, |
| 131 | }; |