1/* 2 * Raw Video Decoder 3 * Copyright (c) 2001 Fabrice Bellard 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/** 23 * @file libavcodec/rawdec.c 24 * Raw Video Decoder 25 */ 26 27#include "avcodec.h" 28#include "raw.h" 29 30typedef struct RawVideoContext { 31 unsigned char * buffer; /* block of memory for holding one frame */ 32 int length; /* number of bytes in buffer */ 33 int flip; 34 AVFrame pic; ///< AVCodecContext.coded_frame 35} RawVideoContext; 36 37static const PixelFormatTag pixelFormatBpsAVI[] = { 38 { PIX_FMT_PAL8, 4 }, 39 { PIX_FMT_PAL8, 8 }, 40 { PIX_FMT_RGB555, 15 }, 41 { PIX_FMT_RGB555, 16 }, 42 { PIX_FMT_BGR24, 24 }, 43 { PIX_FMT_RGB32, 32 }, 44 { PIX_FMT_NONE, 0 }, 45}; 46 47static const PixelFormatTag pixelFormatBpsMOV[] = { 48 /* FIXME fix swscaler to support those */ 49 /* http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/chapter_4_section_2.html */ 50 { PIX_FMT_PAL8, 4 }, 51 { PIX_FMT_PAL8, 8 }, 52 { PIX_FMT_BGR555, 16 }, 53 { PIX_FMT_RGB24, 24 }, 54 { PIX_FMT_BGR32_1, 32 }, 55 { PIX_FMT_NONE, 0 }, 56}; 57 58static enum PixelFormat findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc) 59{ 60 while (tags->pix_fmt >= 0) { 61 if (tags->fourcc == fourcc) 62 return tags->pix_fmt; 63 tags++; 64 } 65 return PIX_FMT_YUV420P; 66} 67 68static av_cold int raw_init_decoder(AVCodecContext *avctx) 69{ 70 RawVideoContext *context = avctx->priv_data; 71 72 if (avctx->codec_tag == MKTAG('r','a','w',' ')) 73 avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_coded_sample); 74 else if (avctx->codec_tag) 75 avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag); 76 else if (avctx->bits_per_coded_sample) 77 avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_coded_sample); 78 79 context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); 80 context->buffer = av_malloc(context->length); 81 context->pic.pict_type = FF_I_TYPE; 82 context->pic.key_frame = 1; 83 84 avctx->coded_frame= &context->pic; 85 86 if (!context->buffer) 87 return -1; 88 89 if(avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) 90 context->flip=1; 91 92 return 0; 93} 94 95static void flip(AVCodecContext *avctx, AVPicture * picture){ 96 picture->data[0] += picture->linesize[0] * (avctx->height-1); 97 picture->linesize[0] *= -1; 98} 99 100static int raw_decode(AVCodecContext *avctx, 101 void *data, int *data_size, 102 const uint8_t *buf, int buf_size) 103{ 104 RawVideoContext *context = avctx->priv_data; 105 106 AVFrame * frame = (AVFrame *) data; 107 AVPicture * picture = (AVPicture *) data; 108 109 frame->interlaced_frame = avctx->coded_frame->interlaced_frame; 110 frame->top_field_first = avctx->coded_frame->top_field_first; 111 112 //4bpp raw in avi and mov (yes this is ugly ...) 113 if(avctx->bits_per_coded_sample == 4 && avctx->pix_fmt==PIX_FMT_PAL8 && 114 (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){ 115 int i; 116 for(i=256*2; i+1 < context->length>>1; i++){ 117 context->buffer[2*i+0]= buf[i-256*2]>>4; 118 context->buffer[2*i+1]= buf[i-256*2]&15; 119 } 120 buf= context->buffer + 256*4; 121 buf_size= context->length - 256*4; 122 } 123 124 if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0)) 125 return -1; 126 127 avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height); 128 if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){ 129 frame->data[1]= context->buffer; 130 } 131 if (avctx->palctrl && avctx->palctrl->palette_changed) { 132 memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE); 133 avctx->palctrl->palette_changed = 0; 134 } 135 136 if(context->flip) 137 flip(avctx, picture); 138 139 if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2')) 140 { 141 // swap fields 142 unsigned char *tmp = picture->data[1]; 143 picture->data[1] = picture->data[2]; 144 picture->data[2] = tmp; 145 } 146 147 *data_size = sizeof(AVPicture); 148 return buf_size; 149} 150 151static av_cold int raw_close_decoder(AVCodecContext *avctx) 152{ 153 RawVideoContext *context = avctx->priv_data; 154 155 av_freep(&context->buffer); 156 return 0; 157} 158 159AVCodec rawvideo_decoder = { 160 "rawvideo", 161 CODEC_TYPE_VIDEO, 162 CODEC_ID_RAWVIDEO, 163 sizeof(RawVideoContext), 164 raw_init_decoder, 165 NULL, 166 raw_close_decoder, 167 raw_decode, 168 .long_name = NULL_IF_CONFIG_SMALL("raw video"), 169}; 170