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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * AVRn decoder |
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| 3 | * Copyright (c) 2012 Michael Niedermayer |
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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 "avcodec.h" |
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| 23 | #include "internal.h" |
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| 24 | #include "mjpeg.h" |
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| 25 | #include "mjpegdec.h" |
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| 26 | #include "libavutil/imgutils.h" |
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| 27 | |||
| 28 | typedef struct { |
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| 29 | MJpegDecodeContext mjpeg_ctx; |
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| 30 | int is_mjpeg; |
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| 31 | int interlace; //FIXME use frame.interlaced_frame |
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| 32 | int tff; |
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| 33 | } AVRnContext; |
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| 34 | |||
| 35 | static av_cold int init(AVCodecContext *avctx) |
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| 36 | { |
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| 37 | AVRnContext *a = avctx->priv_data; |
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| 38 | int ret; |
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| 39 | |||
| 40 | // Support "Resolution 1:1" for Avid AVI Codec |
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| 41 | a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3); |
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| 42 | |||
| 43 | if(!a->is_mjpeg && avctx->lowres) { |
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| 44 | av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n"); |
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| 45 | return AVERROR(EINVAL); |
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| 46 | } |
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| 47 | |||
| 48 | if(a->is_mjpeg) |
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| 49 | return ff_mjpeg_decode_init(avctx); |
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| 50 | |||
| 51 | if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) |
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| 52 | return ret; |
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| 53 | |||
| 54 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
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| 55 | |||
| 56 | if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) { |
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| 57 | int ndx = avctx->extradata[4] + 4; |
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| 58 | a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4); |
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| 59 | if(a->interlace) { |
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| 60 | a->tff = avctx->extradata[ndx + 24] == 1; |
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| 61 | } |
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| 62 | } |
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| 63 | |||
| 64 | return 0; |
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| 65 | } |
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| 66 | |||
| 67 | static av_cold int end(AVCodecContext *avctx) |
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| 68 | { |
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| 69 | AVRnContext *a = avctx->priv_data; |
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| 70 | |||
| 71 | if(a->is_mjpeg) |
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| 72 | ff_mjpeg_decode_end(avctx); |
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| 73 | |||
| 74 | return 0; |
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| 75 | } |
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| 76 | |||
| 77 | static int decode_frame(AVCodecContext *avctx, void *data, |
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| 78 | int *got_frame, AVPacket *avpkt) |
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| 79 | { |
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| 80 | AVRnContext *a = avctx->priv_data; |
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| 81 | AVFrame *p = data; |
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| 82 | const uint8_t *buf = avpkt->data; |
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| 83 | int buf_size = avpkt->size; |
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| 84 | int y, ret, true_height; |
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| 85 | |||
| 86 | if(a->is_mjpeg) |
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| 87 | return ff_mjpeg_decode_frame(avctx, data, got_frame, avpkt); |
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| 88 | |||
| 89 | true_height = buf_size / (2*avctx->width); |
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| 90 | |||
| 91 | if(buf_size < 2*avctx->width * avctx->height) { |
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| 92 | av_log(avctx, AV_LOG_ERROR, "packet too small\n"); |
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| 93 | return AVERROR_INVALIDDATA; |
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| 94 | } |
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| 95 | |||
| 96 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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| 97 | return ret; |
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| 98 | p->pict_type= AV_PICTURE_TYPE_I; |
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| 99 | p->key_frame= 1; |
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| 100 | |||
| 101 | if(a->interlace) { |
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| 102 | buf += (true_height - avctx->height)*avctx->width; |
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| 103 | for(y = 0; y < avctx->height-1; y+=2) { |
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| 104 | memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width); |
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| 105 | memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width); |
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| 106 | buf += 2*avctx->width; |
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| 107 | } |
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| 108 | } else { |
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| 109 | buf += (true_height - avctx->height)*avctx->width*2; |
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| 110 | for(y = 0; y < avctx->height; y++) { |
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| 111 | memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width); |
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| 112 | buf += 2*avctx->width; |
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| 113 | } |
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| 114 | } |
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| 115 | |||
| 116 | *got_frame = 1; |
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| 117 | return buf_size; |
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| 118 | } |
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| 119 | |||
| 120 | AVCodec ff_avrn_decoder = { |
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| 121 | .name = "avrn", |
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| 122 | .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"), |
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| 123 | .type = AVMEDIA_TYPE_VIDEO, |
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| 124 | .id = AV_CODEC_ID_AVRN, |
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| 125 | .priv_data_size = sizeof(AVRnContext), |
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| 126 | .init = init, |
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| 127 | .close = end, |
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| 128 | .decode = decode_frame, |
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| 129 | .capabilities = CODEC_CAP_DR1, |
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| 130 | .max_lowres = 3, |
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| 131 | }; |