1/* 2 * NUT (de)muxing via libnut 3 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * NUT demuxing and muxing via libnut. 25 * @author Oded Shimon <ods15@ods15.dyndns.org> 26 */ 27 28#include "avformat.h" 29#include "riff.h" 30#include <libnut.h> 31 32#define ID_STRING "nut/multimedia container" 33#define ID_LENGTH (strlen(ID_STRING) + 1) 34 35typedef struct { 36 nut_context_tt * nut; 37 nut_stream_header_tt * s; 38} NUTContext; 39 40static const AVCodecTag nut_tags[] = { 41 { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') }, 42 { CODEC_ID_MP3, MKTAG('m', 'p', '3', ' ') }, 43 { CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') }, 44 { 0, 0 }, 45}; 46 47#if CONFIG_LIBNUT_MUXER 48static int av_write(void * h, size_t len, const uint8_t * buf) { 49 ByteIOContext * bc = h; 50 put_buffer(bc, buf, len); 51 //put_flush_packet(bc); 52 return len; 53} 54 55static int nut_write_header(AVFormatContext * avf) { 56 NUTContext * priv = avf->priv_data; 57 ByteIOContext * bc = avf->pb; 58 nut_muxer_opts_tt mopts = { 59 .output = { 60 .priv = bc, 61 .write = av_write, 62 }, 63 .alloc = { av_malloc, av_realloc, av_free }, 64 .write_index = 1, 65 .realtime_stream = 0, 66 .max_distance = 32768, 67 .fti = NULL, 68 }; 69 nut_stream_header_tt * s; 70 int i; 71 72 priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s); 73 74 for (i = 0; i < avf->nb_streams; i++) { 75 AVCodecContext * codec = avf->streams[i]->codec; 76 int j; 77 int fourcc = 0; 78 int num, denom, ssize; 79 80 s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS; 81 82 if (codec->codec_tag) fourcc = codec->codec_tag; 83 else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id); 84 85 if (!fourcc) { 86 if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id); 87 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id); 88 } 89 90 s[i].fourcc_len = 4; 91 s[i].fourcc = av_malloc(s[i].fourcc_len); 92 for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF; 93 94 ff_parse_specific_params(codec, &num, &ssize, &denom); 95 av_set_pts_info(avf->streams[i], 60, denom, num); 96 97 s[i].time_base.num = denom; 98 s[i].time_base.den = num; 99 100 s[i].fixed_fps = 0; 101 s[i].decode_delay = codec->has_b_frames; 102 s[i].codec_specific_len = codec->extradata_size; 103 s[i].codec_specific = codec->extradata; 104 105 if (codec->codec_type == AVMEDIA_TYPE_VIDEO) { 106 s[i].width = codec->width; 107 s[i].height = codec->height; 108 s[i].sample_width = 0; 109 s[i].sample_height = 0; 110 s[i].colorspace_type = 0; 111 } else { 112 s[i].samplerate_num = codec->sample_rate; 113 s[i].samplerate_denom = 1; 114 s[i].channel_count = codec->channels; 115 } 116 } 117 118 s[avf->nb_streams].type = -1; 119 priv->nut = nut_muxer_init(&mopts, s, NULL); 120 121 return 0; 122} 123 124static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) { 125 NUTContext * priv = avf->priv_data; 126 nut_packet_tt p; 127 128 p.len = pkt->size; 129 p.stream = pkt->stream_index; 130 p.pts = pkt->pts; 131 p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0; 132 p.next_pts = 0; 133 134 nut_write_frame_reorder(priv->nut, &p, pkt->data); 135 136 return 0; 137} 138 139static int nut_write_trailer(AVFormatContext * avf) { 140 ByteIOContext * bc = avf->pb; 141 NUTContext * priv = avf->priv_data; 142 int i; 143 144 nut_muxer_uninit_reorder(priv->nut); 145 put_flush_packet(bc); 146 147 for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc); 148 av_freep(&priv->s); 149 150 return 0; 151} 152 153AVOutputFormat libnut_muxer = { 154 "libnut", 155 "nut format", 156 "video/x-nut", 157 "nut", 158 sizeof(NUTContext), 159 CODEC_ID_VORBIS, 160 CODEC_ID_MPEG4, 161 nut_write_header, 162 nut_write_packet, 163 nut_write_trailer, 164 .flags = AVFMT_GLOBALHEADER, 165}; 166#endif /* CONFIG_LIBNUT_MUXER */ 167 168static int nut_probe(AVProbeData *p) { 169 if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX; 170 171 return 0; 172} 173 174static size_t av_read(void * h, size_t len, uint8_t * buf) { 175 ByteIOContext * bc = h; 176 return get_buffer(bc, buf, len); 177} 178 179static off_t av_seek(void * h, long long pos, int whence) { 180 ByteIOContext * bc = h; 181 if (whence == SEEK_END) { 182 pos = url_fsize(bc) + pos; 183 whence = SEEK_SET; 184 } 185 return url_fseek(bc, pos, whence); 186} 187 188static int nut_read_header(AVFormatContext * avf, AVFormatParameters * ap) { 189 NUTContext * priv = avf->priv_data; 190 ByteIOContext * bc = avf->pb; 191 nut_demuxer_opts_tt dopts = { 192 .input = { 193 .priv = bc, 194 .seek = av_seek, 195 .read = av_read, 196 .eof = NULL, 197 .file_pos = 0, 198 }, 199 .alloc = { av_malloc, av_realloc, av_free }, 200 .read_index = 1, 201 .cache_syncpoints = 1, 202 }; 203 nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts); 204 nut_stream_header_tt * s; 205 int ret, i; 206 207 if ((ret = nut_read_headers(nut, &s, NULL))) { 208 av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret)); 209 nut_demuxer_uninit(nut); 210 return -1; 211 } 212 213 priv->s = s; 214 215 for (i = 0; s[i].type != -1 && i < 2; i++) { 216 AVStream * st = av_new_stream(avf, i); 217 int j; 218 219 for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8); 220 221 st->codec->has_b_frames = s[i].decode_delay; 222 223 st->codec->extradata_size = s[i].codec_specific_len; 224 if (st->codec->extradata_size) { 225 st->codec->extradata = av_mallocz(st->codec->extradata_size); 226 memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size); 227 } 228 229 av_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den); 230 st->start_time = 0; 231 st->duration = s[i].max_pts; 232 233 st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag); 234 235 switch(s[i].type) { 236 case NUT_AUDIO_CLASS: 237 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 238 if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, st->codec->codec_tag); 239 240 st->codec->channels = s[i].channel_count; 241 st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom; 242 break; 243 case NUT_VIDEO_CLASS: 244 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 245 if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag); 246 247 st->codec->width = s[i].width; 248 st->codec->height = s[i].height; 249 st->sample_aspect_ratio.num = s[i].sample_width; 250 st->sample_aspect_ratio.den = s[i].sample_height; 251 break; 252 } 253 if (st->codec->codec_id == CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n"); 254 } 255 256 return 0; 257} 258 259static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) { 260 NUTContext * priv = avf->priv_data; 261 nut_packet_tt pd; 262 int ret; 263 264 ret = nut_read_next_packet(priv->nut, &pd); 265 266 if (ret || av_new_packet(pkt, pd.len) < 0) { 267 if (ret != NUT_ERR_EOF) 268 av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret)); 269 return -1; 270 } 271 272 if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY; 273 pkt->pts = pd.pts; 274 pkt->stream_index = pd.stream; 275 pkt->pos = url_ftell(avf->pb); 276 277 ret = nut_read_frame(priv->nut, &pd.len, pkt->data); 278 279 return ret; 280} 281 282static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) { 283 NUTContext * priv = avf->priv_data; 284 int active_streams[] = { stream_index, -1 }; 285 double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den; 286 287 if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1; 288 289 return 0; 290} 291 292static int nut_read_close(AVFormatContext *s) { 293 NUTContext * priv = s->priv_data; 294 295 nut_demuxer_uninit(priv->nut); 296 297 return 0; 298} 299 300AVInputFormat libnut_demuxer = { 301 "libnut", 302 NULL_IF_CONFIG_SMALL("NUT format"), 303 sizeof(NUTContext), 304 nut_probe, 305 nut_read_header, 306 nut_read_packet, 307 nut_read_close, 308 nut_read_seek, 309 .extensions = "nut", 310}; 311