1/* 2 * Dirac decoder support via libdirac library 3 * Copyright (c) 2005 BBC, Andrew Kennedy <dirac at rd dot bbc dot co dot uk> 4 * Copyright (c) 2006-2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com > 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/** 24* @file libavcodec/libdiracdec.c 25* Dirac decoder support via libdirac library; more details about the Dirac 26* project can be found at http://dirac.sourceforge.net/. 27* The libdirac_decoder library implements Dirac specification version 2.2 28* (http://dirac.sourceforge.net/specification.html). 29*/ 30 31#include "libdirac.h" 32 33#undef NDEBUG 34#include <assert.h> 35 36#include <libdirac_decoder/dirac_parser.h> 37 38/** contains a single frame returned from Dirac */ 39typedef struct FfmpegDiracDecoderParams 40{ 41 /** decoder handle */ 42 dirac_decoder_t* p_decoder; 43 44 /** buffer to hold decoded frame */ 45 unsigned char* p_out_frame_buf; 46} FfmpegDiracDecoderParams; 47 48 49/** 50* returns FFmpeg chroma format 51*/ 52static enum PixelFormat GetFfmpegChromaFormat(dirac_chroma_t dirac_pix_fmt) 53{ 54 int num_formats = sizeof(ffmpeg_dirac_pixel_format_map) / 55 sizeof(ffmpeg_dirac_pixel_format_map[0]); 56 int idx; 57 58 for (idx = 0; idx < num_formats; ++idx) { 59 if (ffmpeg_dirac_pixel_format_map[idx].dirac_pix_fmt == dirac_pix_fmt) { 60 return ffmpeg_dirac_pixel_format_map[idx].ff_pix_fmt; 61 } 62 } 63 return PIX_FMT_NONE; 64} 65 66static av_cold int libdirac_decode_init(AVCodecContext *avccontext) 67{ 68 69 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data ; 70 p_dirac_params->p_decoder = dirac_decoder_init(avccontext->debug); 71 72 if (!p_dirac_params->p_decoder) 73 return -1; 74 75 return 0 ; 76} 77 78static int libdirac_decode_frame(AVCodecContext *avccontext, 79 void *data, int *data_size, 80 const uint8_t *buf, int buf_size) 81{ 82 83 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 84 AVPicture *picture = data; 85 AVPicture pic; 86 int pict_size; 87 unsigned char *buffer[3]; 88 89 *data_size = 0; 90 91 if (buf_size>0) { 92 /* set data to decode into buffer */ 93 dirac_buffer (p_dirac_params->p_decoder, buf, buf+buf_size); 94 if ((buf[4] &0x08) == 0x08 && (buf[4] & 0x03)) 95 avccontext->has_b_frames = 1; 96 } 97 while (1) { 98 /* parse data and process result */ 99 DecoderState state = dirac_parse (p_dirac_params->p_decoder); 100 switch (state) 101 { 102 case STATE_BUFFER: 103 return buf_size; 104 105 case STATE_SEQUENCE: 106 { 107 /* tell FFmpeg about sequence details */ 108 dirac_sourceparams_t *src_params = 109 &p_dirac_params->p_decoder->src_params; 110 111 if (avcodec_check_dimensions(avccontext, src_params->width, 112 src_params->height) < 0) { 113 av_log(avccontext, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", 114 src_params->width, src_params->height); 115 avccontext->height = avccontext->width = 0; 116 return -1; 117 } 118 119 avccontext->height = src_params->height; 120 avccontext->width = src_params->width; 121 122 avccontext->pix_fmt = GetFfmpegChromaFormat(src_params->chroma); 123 if (avccontext->pix_fmt == PIX_FMT_NONE) { 124 av_log (avccontext, AV_LOG_ERROR, 125 "Dirac chroma format %d not supported currently\n", 126 src_params->chroma); 127 return -1; 128 } 129 130 avccontext->time_base.den = src_params->frame_rate.numerator; 131 avccontext->time_base.num = src_params->frame_rate.denominator; 132 133 /* calculate output dimensions */ 134 avpicture_fill(&pic, NULL, avccontext->pix_fmt, 135 avccontext->width, avccontext->height); 136 137 pict_size = avpicture_get_size(avccontext->pix_fmt, 138 avccontext->width, 139 avccontext->height); 140 141 /* allocate output buffer */ 142 if (p_dirac_params->p_out_frame_buf == NULL) 143 p_dirac_params->p_out_frame_buf = av_malloc (pict_size); 144 buffer[0] = p_dirac_params->p_out_frame_buf; 145 buffer[1] = p_dirac_params->p_out_frame_buf + 146 pic.linesize[0] * avccontext->height; 147 buffer[2] = buffer[1] + 148 pic.linesize[1] * src_params->chroma_height; 149 150 /* tell Dirac about output destination */ 151 dirac_set_buf(p_dirac_params->p_decoder, buffer, NULL); 152 break; 153 } 154 case STATE_SEQUENCE_END: 155 break; 156 157 case STATE_PICTURE_AVAIL: 158 /* fill picture with current buffer data from Dirac */ 159 avpicture_fill(picture, p_dirac_params->p_out_frame_buf, 160 avccontext->pix_fmt, 161 avccontext->width, avccontext->height); 162 *data_size = sizeof(AVPicture); 163 return buf_size; 164 165 case STATE_INVALID: 166 return -1; 167 168 default: 169 break; 170 } 171 } 172 173 return buf_size; 174} 175 176 177static av_cold int libdirac_decode_close(AVCodecContext *avccontext) 178{ 179 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 180 dirac_decoder_close (p_dirac_params->p_decoder); 181 182 av_freep(&p_dirac_params->p_out_frame_buf); 183 184 return 0 ; 185} 186 187static void libdirac_flush (AVCodecContext *avccontext) 188{ 189 /* Got a seek request. We will need free memory held in the private 190 * context and free the current Dirac decoder handle and then open 191 * a new decoder handle. */ 192 libdirac_decode_close (avccontext); 193 libdirac_decode_init (avccontext); 194 return; 195} 196 197 198 199AVCodec libdirac_decoder = { 200 "libdirac", 201 CODEC_TYPE_VIDEO, 202 CODEC_ID_DIRAC, 203 sizeof(FfmpegDiracDecoderParams), 204 libdirac_decode_init, 205 NULL, 206 libdirac_decode_close, 207 libdirac_decode_frame, 208 CODEC_CAP_DELAY, 209 .flush = libdirac_flush, 210 .long_name = NULL_IF_CONFIG_SMALL("libdirac Dirac 2.2"), 211} ; 212