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libavformat/libnut.c

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00001 /*
00002  * NUT (de)muxing via libnut
00003  * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #include "avformat.h"
00029 #include "riff.h"
00030 #include <libnut.h>
00031 
00032 #define ID_STRING "nut/multimedia container"
00033 #define ID_LENGTH (strlen(ID_STRING) + 1)
00034 
00035 typedef struct {
00036     nut_context_tt * nut;
00037     nut_stream_header_tt * s;
00038 } NUTContext;
00039 
00040 static const AVCodecTag nut_tags[] = {
00041     { CODEC_ID_MPEG4,  MKTAG('m', 'p', '4', 'v') },
00042     { CODEC_ID_MP3,    MKTAG('m', 'p', '3', ' ') },
00043     { CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
00044     { 0, 0 },
00045 };
00046 
00047 #if CONFIG_LIBNUT_MUXER
00048 static int av_write(void * h, size_t len, const uint8_t * buf) {
00049     ByteIOContext * bc = h;
00050     put_buffer(bc, buf, len);
00051     //put_flush_packet(bc);
00052     return len;
00053 }
00054 
00055 static int nut_write_header(AVFormatContext * avf) {
00056     NUTContext * priv = avf->priv_data;
00057     ByteIOContext * bc = avf->pb;
00058     nut_muxer_opts_tt mopts = {
00059         .output = {
00060             .priv = bc,
00061             .write = av_write,
00062         },
00063         .alloc = { av_malloc, av_realloc, av_free },
00064         .write_index = 1,
00065         .realtime_stream = 0,
00066         .max_distance = 32768,
00067         .fti = NULL,
00068     };
00069     nut_stream_header_tt * s;
00070     int i;
00071 
00072     priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s);
00073 
00074     for (i = 0; i < avf->nb_streams; i++) {
00075         AVCodecContext * codec = avf->streams[i]->codec;
00076         int j;
00077         int fourcc = 0;
00078         int num, denom, ssize;
00079 
00080         s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
00081 
00082         if (codec->codec_tag) fourcc = codec->codec_tag;
00083         else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id);
00084 
00085         if (!fourcc) {
00086             if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
00087             if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
00088         }
00089 
00090         s[i].fourcc_len = 4;
00091         s[i].fourcc = av_malloc(s[i].fourcc_len);
00092         for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
00093 
00094         ff_parse_specific_params(codec, &num, &ssize, &denom);
00095         av_set_pts_info(avf->streams[i], 60, denom, num);
00096 
00097         s[i].time_base.num = denom;
00098         s[i].time_base.den = num;
00099 
00100         s[i].fixed_fps = 0;
00101         s[i].decode_delay = codec->has_b_frames;
00102         s[i].codec_specific_len = codec->extradata_size;
00103         s[i].codec_specific = codec->extradata;
00104 
00105         if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00106             s[i].width = codec->width;
00107             s[i].height = codec->height;
00108             s[i].sample_width = 0;
00109             s[i].sample_height = 0;
00110             s[i].colorspace_type = 0;
00111         } else {
00112             s[i].samplerate_num = codec->sample_rate;
00113             s[i].samplerate_denom = 1;
00114             s[i].channel_count = codec->channels;
00115         }
00116     }
00117 
00118     s[avf->nb_streams].type = -1;
00119     priv->nut = nut_muxer_init(&mopts, s, NULL);
00120 
00121     return 0;
00122 }
00123 
00124 static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
00125     NUTContext * priv = avf->priv_data;
00126     nut_packet_tt p;
00127 
00128     p.len = pkt->size;
00129     p.stream = pkt->stream_index;
00130     p.pts = pkt->pts;
00131     p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
00132     p.next_pts = 0;
00133 
00134     nut_write_frame_reorder(priv->nut, &p, pkt->data);
00135 
00136     return 0;
00137 }
00138 
00139 static int nut_write_trailer(AVFormatContext * avf) {
00140     ByteIOContext * bc = avf->pb;
00141     NUTContext * priv = avf->priv_data;
00142     int i;
00143 
00144     nut_muxer_uninit_reorder(priv->nut);
00145     put_flush_packet(bc);
00146 
00147     for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
00148     av_freep(&priv->s);
00149 
00150     return 0;
00151 }
00152 
00153 AVOutputFormat libnut_muxer = {
00154     "libnut",
00155     "nut format",
00156     "video/x-nut",
00157     "nut",
00158     sizeof(NUTContext),
00159     CODEC_ID_VORBIS,
00160     CODEC_ID_MPEG4,
00161     nut_write_header,
00162     nut_write_packet,
00163     nut_write_trailer,
00164     .flags = AVFMT_GLOBALHEADER,
00165 };
00166 #endif /* CONFIG_LIBNUT_MUXER */
00167 
00168 static int nut_probe(AVProbeData *p) {
00169     if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
00170 
00171     return 0;
00172 }
00173 
00174 static size_t av_read(void * h, size_t len, uint8_t * buf) {
00175     ByteIOContext * bc = h;
00176     return get_buffer(bc, buf, len);
00177 }
00178 
00179 static off_t av_seek(void * h, long long pos, int whence) {
00180     ByteIOContext * bc = h;
00181     if (whence == SEEK_END) {
00182         pos = url_fsize(bc) + pos;
00183         whence = SEEK_SET;
00184     }
00185     return url_fseek(bc, pos, whence);
00186 }
00187 
00188 static int nut_read_header(AVFormatContext * avf, AVFormatParameters * ap) {
00189     NUTContext * priv = avf->priv_data;
00190     ByteIOContext * bc = avf->pb;
00191     nut_demuxer_opts_tt dopts = {
00192         .input = {
00193             .priv = bc,
00194             .seek = av_seek,
00195             .read = av_read,
00196             .eof = NULL,
00197             .file_pos = 0,
00198         },
00199         .alloc = { av_malloc, av_realloc, av_free },
00200         .read_index = 1,
00201         .cache_syncpoints = 1,
00202     };
00203     nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
00204     nut_stream_header_tt * s;
00205     int ret, i;
00206 
00207     if ((ret = nut_read_headers(nut, &s, NULL))) {
00208         av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
00209         nut_demuxer_uninit(nut);
00210         return -1;
00211     }
00212 
00213     priv->s = s;
00214 
00215     for (i = 0; s[i].type != -1 && i < 2; i++) {
00216         AVStream * st = av_new_stream(avf, i);
00217         int j;
00218 
00219         for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8);
00220 
00221         st->codec->has_b_frames = s[i].decode_delay;
00222 
00223         st->codec->extradata_size = s[i].codec_specific_len;
00224         if (st->codec->extradata_size) {
00225             st->codec->extradata = av_mallocz(st->codec->extradata_size);
00226             memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
00227         }
00228 
00229         av_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den);
00230         st->start_time = 0;
00231         st->duration = s[i].max_pts;
00232 
00233         st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag);
00234 
00235         switch(s[i].type) {
00236         case NUT_AUDIO_CLASS:
00237             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00238             if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, st->codec->codec_tag);
00239 
00240             st->codec->channels = s[i].channel_count;
00241             st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom;
00242             break;
00243         case NUT_VIDEO_CLASS:
00244             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00245             if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
00246 
00247             st->codec->width = s[i].width;
00248             st->codec->height = s[i].height;
00249             st->sample_aspect_ratio.num = s[i].sample_width;
00250             st->sample_aspect_ratio.den = s[i].sample_height;
00251             break;
00252         }
00253         if (st->codec->codec_id == CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
00254     }
00255 
00256     return 0;
00257 }
00258 
00259 static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
00260     NUTContext * priv = avf->priv_data;
00261     nut_packet_tt pd;
00262     int ret;
00263 
00264     ret = nut_read_next_packet(priv->nut, &pd);
00265 
00266     if (ret || av_new_packet(pkt, pd.len) < 0) {
00267         if (ret != NUT_ERR_EOF)
00268             av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
00269         return -1;
00270     }
00271 
00272     if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY;
00273     pkt->pts = pd.pts;
00274     pkt->stream_index = pd.stream;
00275     pkt->pos = url_ftell(avf->pb);
00276 
00277     ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
00278 
00279     return ret;
00280 }
00281 
00282 static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
00283     NUTContext * priv = avf->priv_data;
00284     int active_streams[] = { stream_index, -1 };
00285     double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den;
00286 
00287     if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
00288 
00289     return 0;
00290 }
00291 
00292 static int nut_read_close(AVFormatContext *s) {
00293     NUTContext * priv = s->priv_data;
00294 
00295     nut_demuxer_uninit(priv->nut);
00296 
00297     return 0;
00298 }
00299 
00300 AVInputFormat libnut_demuxer = {
00301     "libnut",
00302     NULL_IF_CONFIG_SMALL("NUT format"),
00303     sizeof(NUTContext),
00304     nut_probe,
00305     nut_read_header,
00306     nut_read_packet,
00307     nut_read_close,
00308     nut_read_seek,
00309     .extensions = "nut",
00310 };

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