Libav 0.7.1
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00001 /* 00002 * Dirac decoder support via Schroedinger libraries 00003 * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com > 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00030 #include "libavutil/imgutils.h" 00031 #include "avcodec.h" 00032 #include "libdirac_libschro.h" 00033 #include "libschroedinger.h" 00034 00035 #undef NDEBUG 00036 #include <assert.h> 00037 00038 00039 #include <schroedinger/schro.h> 00040 #include <schroedinger/schrodebug.h> 00041 #include <schroedinger/schrovideoformat.h> 00042 00044 typedef struct FfmpegSchroDecoderParams { 00046 SchroVideoFormat *format; 00047 00049 SchroFrameFormat frame_format; 00050 00052 SchroDecoder* decoder; 00053 00055 FfmpegDiracSchroQueue dec_frame_queue; 00056 00058 int eos_signalled; 00059 00061 int eos_pulled; 00062 00064 AVPicture dec_pic; 00065 } FfmpegSchroDecoderParams; 00066 00067 typedef struct FfmpegSchroParseUnitContext { 00068 const uint8_t *buf; 00069 int buf_size; 00070 } FfmpegSchroParseUnitContext; 00071 00072 00073 static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf, 00074 void *priv); 00075 00076 static void FfmpegSchroParseContextInit(FfmpegSchroParseUnitContext *parse_ctx, 00077 const uint8_t *buf, int buf_size) 00078 { 00079 parse_ctx->buf = buf; 00080 parse_ctx->buf_size = buf_size; 00081 } 00082 00083 static SchroBuffer* FfmpegFindNextSchroParseUnit(FfmpegSchroParseUnitContext *parse_ctx) 00084 { 00085 SchroBuffer *enc_buf = NULL; 00086 int next_pu_offset = 0; 00087 unsigned char *in_buf; 00088 00089 if (parse_ctx->buf_size < 13 || 00090 parse_ctx->buf[0] != 'B' || 00091 parse_ctx->buf[1] != 'B' || 00092 parse_ctx->buf[2] != 'C' || 00093 parse_ctx->buf[3] != 'D') 00094 return NULL; 00095 00096 next_pu_offset = (parse_ctx->buf[5] << 24) + 00097 (parse_ctx->buf[6] << 16) + 00098 (parse_ctx->buf[7] << 8) + 00099 parse_ctx->buf[8]; 00100 00101 if (next_pu_offset == 0 && 00102 SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4])) 00103 next_pu_offset = 13; 00104 00105 if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset) 00106 return NULL; 00107 00108 in_buf = av_malloc(next_pu_offset); 00109 memcpy(in_buf, parse_ctx->buf, next_pu_offset); 00110 enc_buf = schro_buffer_new_with_data(in_buf, next_pu_offset); 00111 enc_buf->free = libschroedinger_decode_buffer_free; 00112 enc_buf->priv = in_buf; 00113 00114 parse_ctx->buf += next_pu_offset; 00115 parse_ctx->buf_size -= next_pu_offset; 00116 00117 return enc_buf; 00118 } 00119 00123 static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt) 00124 { 00125 int num_formats = sizeof(ffmpeg_schro_pixel_format_map) / 00126 sizeof(ffmpeg_schro_pixel_format_map[0]); 00127 int idx; 00128 00129 for (idx = 0; idx < num_formats; ++idx) 00130 if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) 00131 return ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt; 00132 return PIX_FMT_NONE; 00133 } 00134 00135 static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext) 00136 { 00137 00138 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 00139 /* First of all, initialize our supporting libraries. */ 00140 schro_init(); 00141 00142 schro_debug_set_level(avccontext->debug); 00143 p_schro_params->decoder = schro_decoder_new(); 00144 schro_decoder_set_skip_ratio(p_schro_params->decoder, 1); 00145 00146 if (!p_schro_params->decoder) 00147 return -1; 00148 00149 /* Initialize the decoded frame queue. */ 00150 ff_dirac_schro_queue_init(&p_schro_params->dec_frame_queue); 00151 return 0; 00152 } 00153 00154 static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf, 00155 void *priv) 00156 { 00157 av_freep(&priv); 00158 } 00159 00160 static void libschroedinger_decode_frame_free(void *frame) 00161 { 00162 schro_frame_unref(frame); 00163 } 00164 00165 static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext) 00166 { 00167 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 00168 SchroDecoder *decoder = p_schro_params->decoder; 00169 00170 p_schro_params->format = schro_decoder_get_video_format(decoder); 00171 00172 /* Tell Libav about sequence details. */ 00173 if (av_image_check_size(p_schro_params->format->width, p_schro_params->format->height, 00174 0, avccontext) < 0) { 00175 av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n", 00176 p_schro_params->format->width, p_schro_params->format->height); 00177 avccontext->height = avccontext->width = 0; 00178 return; 00179 } 00180 avccontext->height = p_schro_params->format->height; 00181 avccontext->width = p_schro_params->format->width; 00182 avccontext->pix_fmt = GetFfmpegChromaFormat(p_schro_params->format->chroma_format); 00183 00184 if (ff_get_schro_frame_format(p_schro_params->format->chroma_format, 00185 &p_schro_params->frame_format) == -1) { 00186 av_log(avccontext, AV_LOG_ERROR, 00187 "This codec currently only supports planar YUV 4:2:0, 4:2:2 " 00188 "and 4:4:4 formats.\n"); 00189 return; 00190 } 00191 00192 avccontext->time_base.den = p_schro_params->format->frame_rate_numerator; 00193 avccontext->time_base.num = p_schro_params->format->frame_rate_denominator; 00194 00195 if (!p_schro_params->dec_pic.data[0]) 00196 avpicture_alloc(&p_schro_params->dec_pic, 00197 avccontext->pix_fmt, 00198 avccontext->width, 00199 avccontext->height); 00200 } 00201 00202 static int libschroedinger_decode_frame(AVCodecContext *avccontext, 00203 void *data, int *data_size, 00204 AVPacket *avpkt) 00205 { 00206 const uint8_t *buf = avpkt->data; 00207 int buf_size = avpkt->size; 00208 00209 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 00210 SchroDecoder *decoder = p_schro_params->decoder; 00211 SchroVideoFormat *format; 00212 AVPicture *picture = data; 00213 SchroBuffer *enc_buf; 00214 SchroFrame* frame; 00215 int state; 00216 int go = 1; 00217 int outer = 1; 00218 FfmpegSchroParseUnitContext parse_ctx; 00219 00220 *data_size = 0; 00221 00222 FfmpegSchroParseContextInit(&parse_ctx, buf, buf_size); 00223 if (!buf_size) { 00224 if (!p_schro_params->eos_signalled) { 00225 state = schro_decoder_push_end_of_stream(decoder); 00226 p_schro_params->eos_signalled = 1; 00227 } 00228 } 00229 00230 /* Loop through all the individual parse units in the input buffer */ 00231 do { 00232 if ((enc_buf = FfmpegFindNextSchroParseUnit(&parse_ctx))) { 00233 /* Push buffer into decoder. */ 00234 if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) && 00235 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0) 00236 avccontext->has_b_frames = 1; 00237 state = schro_decoder_push(decoder, enc_buf); 00238 if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT) 00239 libschroedinger_handle_first_access_unit(avccontext); 00240 go = 1; 00241 } else 00242 outer = 0; 00243 format = p_schro_params->format; 00244 00245 while (go) { 00246 /* Parse data and process result. */ 00247 state = schro_decoder_wait(decoder); 00248 switch (state) { 00249 case SCHRO_DECODER_FIRST_ACCESS_UNIT: 00250 libschroedinger_handle_first_access_unit(avccontext); 00251 break; 00252 00253 case SCHRO_DECODER_NEED_BITS: 00254 /* Need more input data - stop iterating over what we have. */ 00255 go = 0; 00256 break; 00257 00258 case SCHRO_DECODER_NEED_FRAME: 00259 /* Decoder needs a frame - create one and push it in. */ 00260 frame = ff_create_schro_frame(avccontext, 00261 p_schro_params->frame_format); 00262 schro_decoder_add_output_picture(decoder, frame); 00263 break; 00264 00265 case SCHRO_DECODER_OK: 00266 /* Pull a frame out of the decoder. */ 00267 frame = schro_decoder_pull(decoder); 00268 00269 if (frame) 00270 ff_dirac_schro_queue_push_back(&p_schro_params->dec_frame_queue, 00271 frame); 00272 break; 00273 case SCHRO_DECODER_EOS: 00274 go = 0; 00275 p_schro_params->eos_pulled = 1; 00276 schro_decoder_reset(decoder); 00277 outer = 0; 00278 break; 00279 00280 case SCHRO_DECODER_ERROR: 00281 return -1; 00282 break; 00283 } 00284 } 00285 } while (outer); 00286 00287 /* Grab next frame to be returned from the top of the queue. */ 00288 frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue); 00289 00290 if (frame) { 00291 memcpy(p_schro_params->dec_pic.data[0], 00292 frame->components[0].data, 00293 frame->components[0].length); 00294 00295 memcpy(p_schro_params->dec_pic.data[1], 00296 frame->components[1].data, 00297 frame->components[1].length); 00298 00299 memcpy(p_schro_params->dec_pic.data[2], 00300 frame->components[2].data, 00301 frame->components[2].length); 00302 00303 /* Fill picture with current buffer data from Schroedinger. */ 00304 avpicture_fill(picture, p_schro_params->dec_pic.data[0], 00305 avccontext->pix_fmt, 00306 avccontext->width, avccontext->height); 00307 00308 *data_size = sizeof(AVPicture); 00309 00310 /* Now free the frame resources. */ 00311 libschroedinger_decode_frame_free(frame); 00312 } 00313 return buf_size; 00314 } 00315 00316 00317 static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext) 00318 { 00319 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 00320 /* Free the decoder. */ 00321 schro_decoder_free(p_schro_params->decoder); 00322 av_freep(&p_schro_params->format); 00323 00324 avpicture_free(&p_schro_params->dec_pic); 00325 00326 /* Free data in the output frame queue. */ 00327 ff_dirac_schro_queue_free(&p_schro_params->dec_frame_queue, 00328 libschroedinger_decode_frame_free); 00329 00330 return 0; 00331 } 00332 00333 static void libschroedinger_flush(AVCodecContext *avccontext) 00334 { 00335 /* Got a seek request. Free the decoded frames queue and then reset 00336 * the decoder */ 00337 FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; 00338 00339 /* Free data in the output frame queue. */ 00340 ff_dirac_schro_queue_free(&p_schro_params->dec_frame_queue, 00341 libschroedinger_decode_frame_free); 00342 00343 ff_dirac_schro_queue_init(&p_schro_params->dec_frame_queue); 00344 schro_decoder_reset(p_schro_params->decoder); 00345 p_schro_params->eos_pulled = 0; 00346 p_schro_params->eos_signalled = 0; 00347 } 00348 00349 AVCodec ff_libschroedinger_decoder = { 00350 "libschroedinger", 00351 AVMEDIA_TYPE_VIDEO, 00352 CODEC_ID_DIRAC, 00353 sizeof(FfmpegSchroDecoderParams), 00354 libschroedinger_decode_init, 00355 NULL, 00356 libschroedinger_decode_close, 00357 libschroedinger_decode_frame, 00358 CODEC_CAP_DELAY, 00359 .flush = libschroedinger_flush, 00360 .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"), 00361 };