Libav 0.7.1
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00001 /* 00002 * Dirac decoder support via libdirac library 00003 * Copyright (c) 2005 BBC, Andrew Kennedy <dirac at rd dot bbc dot co dot uk> 00004 * Copyright (c) 2006-2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com > 00005 * 00006 * This file is part of Libav. 00007 * 00008 * Libav is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * Libav is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with Libav; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00031 #include "libavutil/imgutils.h" 00032 #include "libdirac.h" 00033 00034 #undef NDEBUG 00035 #include <assert.h> 00036 00037 #include <libdirac_decoder/dirac_parser.h> 00038 00040 typedef struct FfmpegDiracDecoderParams { 00042 dirac_decoder_t* p_decoder; 00043 00045 unsigned char* p_out_frame_buf; 00046 } FfmpegDiracDecoderParams; 00047 00048 00052 static enum PixelFormat GetFfmpegChromaFormat(dirac_chroma_t dirac_pix_fmt) 00053 { 00054 int num_formats = sizeof(ffmpeg_dirac_pixel_format_map) / 00055 sizeof(ffmpeg_dirac_pixel_format_map[0]); 00056 int idx; 00057 00058 for (idx = 0; idx < num_formats; ++idx) 00059 if (ffmpeg_dirac_pixel_format_map[idx].dirac_pix_fmt == dirac_pix_fmt) 00060 return ffmpeg_dirac_pixel_format_map[idx].ff_pix_fmt; 00061 return PIX_FMT_NONE; 00062 } 00063 00064 static av_cold int libdirac_decode_init(AVCodecContext *avccontext) 00065 { 00066 00067 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 00068 p_dirac_params->p_decoder = dirac_decoder_init(avccontext->debug); 00069 00070 if (!p_dirac_params->p_decoder) 00071 return -1; 00072 00073 return 0; 00074 } 00075 00076 static int libdirac_decode_frame(AVCodecContext *avccontext, 00077 void *data, int *data_size, 00078 AVPacket *avpkt) 00079 { 00080 const uint8_t *buf = avpkt->data; 00081 int buf_size = avpkt->size; 00082 00083 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 00084 AVPicture *picture = data; 00085 AVPicture pic; 00086 int pict_size; 00087 unsigned char *buffer[3]; 00088 00089 *data_size = 0; 00090 00091 if (buf_size > 0) { 00092 /* set data to decode into buffer */ 00093 dirac_buffer(p_dirac_params->p_decoder, buf, buf + buf_size); 00094 if ((buf[4] & 0x08) == 0x08 && (buf[4] & 0x03)) 00095 avccontext->has_b_frames = 1; 00096 } 00097 while (1) { 00098 /* parse data and process result */ 00099 DecoderState state = dirac_parse(p_dirac_params->p_decoder); 00100 switch (state) { 00101 case STATE_BUFFER: 00102 return buf_size; 00103 00104 case STATE_SEQUENCE: 00105 { 00106 /* tell Libav about sequence details */ 00107 dirac_sourceparams_t *src_params = &p_dirac_params->p_decoder->src_params; 00108 00109 if (av_image_check_size(src_params->width, src_params->height, 00110 0, avccontext) < 0) { 00111 av_log(avccontext, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", 00112 src_params->width, src_params->height); 00113 avccontext->height = avccontext->width = 0; 00114 return -1; 00115 } 00116 00117 avccontext->height = src_params->height; 00118 avccontext->width = src_params->width; 00119 00120 avccontext->pix_fmt = GetFfmpegChromaFormat(src_params->chroma); 00121 if (avccontext->pix_fmt == PIX_FMT_NONE) { 00122 av_log(avccontext, AV_LOG_ERROR, 00123 "Dirac chroma format %d not supported currently\n", 00124 src_params->chroma); 00125 return -1; 00126 } 00127 00128 avccontext->time_base.den = src_params->frame_rate.numerator; 00129 avccontext->time_base.num = src_params->frame_rate.denominator; 00130 00131 /* calculate output dimensions */ 00132 avpicture_fill(&pic, NULL, avccontext->pix_fmt, 00133 avccontext->width, avccontext->height); 00134 00135 pict_size = avpicture_get_size(avccontext->pix_fmt, 00136 avccontext->width, 00137 avccontext->height); 00138 00139 /* allocate output buffer */ 00140 if (!p_dirac_params->p_out_frame_buf) 00141 p_dirac_params->p_out_frame_buf = av_malloc(pict_size); 00142 buffer[0] = p_dirac_params->p_out_frame_buf; 00143 buffer[1] = p_dirac_params->p_out_frame_buf + 00144 pic.linesize[0] * avccontext->height; 00145 buffer[2] = buffer[1] + 00146 pic.linesize[1] * src_params->chroma_height; 00147 00148 /* tell Dirac about output destination */ 00149 dirac_set_buf(p_dirac_params->p_decoder, buffer, NULL); 00150 break; 00151 } 00152 case STATE_SEQUENCE_END: 00153 break; 00154 00155 case STATE_PICTURE_AVAIL: 00156 /* fill picture with current buffer data from Dirac */ 00157 avpicture_fill(picture, p_dirac_params->p_out_frame_buf, 00158 avccontext->pix_fmt, 00159 avccontext->width, avccontext->height); 00160 *data_size = sizeof(AVPicture); 00161 return buf_size; 00162 00163 case STATE_INVALID: 00164 return -1; 00165 00166 default: 00167 break; 00168 } 00169 } 00170 00171 return buf_size; 00172 } 00173 00174 00175 static av_cold int libdirac_decode_close(AVCodecContext *avccontext) 00176 { 00177 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 00178 dirac_decoder_close(p_dirac_params->p_decoder); 00179 00180 av_freep(&p_dirac_params->p_out_frame_buf); 00181 00182 return 0; 00183 } 00184 00185 static void libdirac_flush(AVCodecContext *avccontext) 00186 { 00187 /* Got a seek request. We will need free memory held in the private 00188 * context and free the current Dirac decoder handle and then open 00189 * a new decoder handle. */ 00190 libdirac_decode_close(avccontext); 00191 libdirac_decode_init(avccontext); 00192 return; 00193 } 00194 00195 00196 00197 AVCodec ff_libdirac_decoder = { 00198 "libdirac", 00199 AVMEDIA_TYPE_VIDEO, 00200 CODEC_ID_DIRAC, 00201 sizeof(FfmpegDiracDecoderParams), 00202 libdirac_decode_init, 00203 NULL, 00204 libdirac_decode_close, 00205 libdirac_decode_frame, 00206 CODEC_CAP_DELAY, 00207 .flush = libdirac_flush, 00208 .long_name = NULL_IF_CONFIG_SMALL("libdirac Dirac 2.2"), 00209 };