Libav
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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 FFmpeg. 00007 * 00008 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00031 #include "libdirac.h" 00032 00033 #undef NDEBUG 00034 #include <assert.h> 00035 00036 #include <libdirac_decoder/dirac_parser.h> 00037 00039 typedef struct FfmpegDiracDecoderParams { 00041 dirac_decoder_t* p_decoder; 00042 00044 unsigned char* p_out_frame_buf; 00045 } FfmpegDiracDecoderParams; 00046 00047 00051 static enum PixelFormat GetFfmpegChromaFormat(dirac_chroma_t dirac_pix_fmt) 00052 { 00053 int num_formats = sizeof(ffmpeg_dirac_pixel_format_map) / 00054 sizeof(ffmpeg_dirac_pixel_format_map[0]); 00055 int idx; 00056 00057 for (idx = 0; idx < num_formats; ++idx) 00058 if (ffmpeg_dirac_pixel_format_map[idx].dirac_pix_fmt == dirac_pix_fmt) 00059 return ffmpeg_dirac_pixel_format_map[idx].ff_pix_fmt; 00060 return PIX_FMT_NONE; 00061 } 00062 00063 static av_cold int libdirac_decode_init(AVCodecContext *avccontext) 00064 { 00065 00066 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 00067 p_dirac_params->p_decoder = dirac_decoder_init(avccontext->debug); 00068 00069 if (!p_dirac_params->p_decoder) 00070 return -1; 00071 00072 return 0; 00073 } 00074 00075 static int libdirac_decode_frame(AVCodecContext *avccontext, 00076 void *data, int *data_size, 00077 AVPacket *avpkt) 00078 { 00079 const uint8_t *buf = avpkt->data; 00080 int buf_size = avpkt->size; 00081 00082 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 00083 AVPicture *picture = data; 00084 AVPicture pic; 00085 int pict_size; 00086 unsigned char *buffer[3]; 00087 00088 *data_size = 0; 00089 00090 if (buf_size > 0) { 00091 /* set data to decode into buffer */ 00092 dirac_buffer(p_dirac_params->p_decoder, buf, buf + buf_size); 00093 if ((buf[4] & 0x08) == 0x08 && (buf[4] & 0x03)) 00094 avccontext->has_b_frames = 1; 00095 } 00096 while (1) { 00097 /* parse data and process result */ 00098 DecoderState state = dirac_parse(p_dirac_params->p_decoder); 00099 switch (state) { 00100 case STATE_BUFFER: 00101 return buf_size; 00102 00103 case STATE_SEQUENCE: 00104 { 00105 /* tell FFmpeg about sequence details */ 00106 dirac_sourceparams_t *src_params = &p_dirac_params->p_decoder->src_params; 00107 00108 if (avcodec_check_dimensions(avccontext, src_params->width, 00109 src_params->height) < 0) { 00110 av_log(avccontext, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", 00111 src_params->width, src_params->height); 00112 avccontext->height = avccontext->width = 0; 00113 return -1; 00114 } 00115 00116 avccontext->height = src_params->height; 00117 avccontext->width = src_params->width; 00118 00119 avccontext->pix_fmt = GetFfmpegChromaFormat(src_params->chroma); 00120 if (avccontext->pix_fmt == PIX_FMT_NONE) { 00121 av_log(avccontext, AV_LOG_ERROR, 00122 "Dirac chroma format %d not supported currently\n", 00123 src_params->chroma); 00124 return -1; 00125 } 00126 00127 avccontext->time_base.den = src_params->frame_rate.numerator; 00128 avccontext->time_base.num = src_params->frame_rate.denominator; 00129 00130 /* calculate output dimensions */ 00131 avpicture_fill(&pic, NULL, avccontext->pix_fmt, 00132 avccontext->width, avccontext->height); 00133 00134 pict_size = avpicture_get_size(avccontext->pix_fmt, 00135 avccontext->width, 00136 avccontext->height); 00137 00138 /* allocate output buffer */ 00139 if (!p_dirac_params->p_out_frame_buf) 00140 p_dirac_params->p_out_frame_buf = av_malloc(pict_size); 00141 buffer[0] = p_dirac_params->p_out_frame_buf; 00142 buffer[1] = p_dirac_params->p_out_frame_buf + 00143 pic.linesize[0] * avccontext->height; 00144 buffer[2] = buffer[1] + 00145 pic.linesize[1] * src_params->chroma_height; 00146 00147 /* tell Dirac about output destination */ 00148 dirac_set_buf(p_dirac_params->p_decoder, buffer, NULL); 00149 break; 00150 } 00151 case STATE_SEQUENCE_END: 00152 break; 00153 00154 case STATE_PICTURE_AVAIL: 00155 /* fill picture with current buffer data from Dirac */ 00156 avpicture_fill(picture, p_dirac_params->p_out_frame_buf, 00157 avccontext->pix_fmt, 00158 avccontext->width, avccontext->height); 00159 *data_size = sizeof(AVPicture); 00160 return buf_size; 00161 00162 case STATE_INVALID: 00163 return -1; 00164 00165 default: 00166 break; 00167 } 00168 } 00169 00170 return buf_size; 00171 } 00172 00173 00174 static av_cold int libdirac_decode_close(AVCodecContext *avccontext) 00175 { 00176 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data; 00177 dirac_decoder_close(p_dirac_params->p_decoder); 00178 00179 av_freep(&p_dirac_params->p_out_frame_buf); 00180 00181 return 0; 00182 } 00183 00184 static void libdirac_flush(AVCodecContext *avccontext) 00185 { 00186 /* Got a seek request. We will need free memory held in the private 00187 * context and free the current Dirac decoder handle and then open 00188 * a new decoder handle. */ 00189 libdirac_decode_close(avccontext); 00190 libdirac_decode_init(avccontext); 00191 return; 00192 } 00193 00194 00195 00196 AVCodec libdirac_decoder = { 00197 "libdirac", 00198 AVMEDIA_TYPE_VIDEO, 00199 CODEC_ID_DIRAC, 00200 sizeof(FfmpegDiracDecoderParams), 00201 libdirac_decode_init, 00202 NULL, 00203 libdirac_decode_close, 00204 libdirac_decode_frame, 00205 CODEC_CAP_DELAY, 00206 .flush = libdirac_flush, 00207 .long_name = NULL_IF_CONFIG_SMALL("libdirac Dirac 2.2"), 00208 };