| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "codec_internal.h" | ||
| 24 | #include "decode.h" | ||
| 25 | #include "libavutil/imgutils.h" | ||
| 26 | |||
| 27 | typedef struct { | ||
| 28 | int interlace; | ||
| 29 | int tff; | ||
| 30 | } AVRnContext; | ||
| 31 | |||
| 32 | 2 | static av_cold int init(AVCodecContext *avctx) | |
| 33 | { | ||
| 34 | 2 | AVRnContext *a = avctx->priv_data; | |
| 35 | int ret; | ||
| 36 | |||
| 37 |
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2 | if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) |
| 38 | ✗ | return ret; | |
| 39 | |||
| 40 | 2 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; | |
| 41 | |||
| 42 |
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2 | if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) { |
| 43 | 2 | int ndx = avctx->extradata[4] + 4; | |
| 44 | 2 | a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4); | |
| 45 |
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2 | if(a->interlace) { |
| 46 | 2 | a->tff = avctx->extradata[ndx + 24] == 1; | |
| 47 | } | ||
| 48 | } | ||
| 49 | |||
| 50 | 2 | return 0; | |
| 51 | } | ||
| 52 | |||
| 53 | 2 | static int decode_frame(AVCodecContext *avctx, AVFrame *p, | |
| 54 | int *got_frame, AVPacket *avpkt) | ||
| 55 | { | ||
| 56 | 2 | AVRnContext *a = avctx->priv_data; | |
| 57 | 2 | const uint8_t *buf = avpkt->data; | |
| 58 | 2 | int buf_size = avpkt->size; | |
| 59 | int y, ret, true_height; | ||
| 60 | |||
| 61 | 2 | true_height = buf_size / (2*avctx->width); | |
| 62 | |||
| 63 |
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2 | if(buf_size < 2*avctx->width * avctx->height) { |
| 64 | ✗ | av_log(avctx, AV_LOG_ERROR, "packet too small\n"); | |
| 65 | ✗ | return AVERROR_INVALIDDATA; | |
| 66 | } | ||
| 67 | |||
| 68 |
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2 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 69 | ✗ | return ret; | |
| 70 | |||
| 71 |
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2 | if(a->interlace) { |
| 72 | 2 | buf += (true_height - avctx->height)*avctx->width; | |
| 73 |
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488 | for(y = 0; y < avctx->height-1; y+=2) { |
| 74 | 486 | memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width); | |
| 75 | 486 | memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width); | |
| 76 | 486 | buf += 2*avctx->width; | |
| 77 | } | ||
| 78 | } else { | ||
| 79 | ✗ | buf += (true_height - avctx->height)*avctx->width*2; | |
| 80 | ✗ | for(y = 0; y < avctx->height; y++) { | |
| 81 | ✗ | memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width); | |
| 82 | ✗ | buf += 2*avctx->width; | |
| 83 | } | ||
| 84 | } | ||
| 85 | |||
| 86 | 2 | *got_frame = 1; | |
| 87 | 2 | return buf_size; | |
| 88 | } | ||
| 89 | |||
| 90 | const FFCodec ff_avrn_decoder = { | ||
| 91 | .p.name = "avrn", | ||
| 92 | CODEC_LONG_NAME("Avid AVI Codec"), | ||
| 93 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 94 | .p.id = AV_CODEC_ID_AVRN, | ||
| 95 | .priv_data_size = sizeof(AVRnContext), | ||
| 96 | .init = init, | ||
| 97 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 98 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 99 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 100 | }; | ||
| 101 |