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