/* * NUT (de)muxing via libnut * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * NUT demuxing and muxing via libnut. * @author Oded Shimon <ods15@ods15.dyndns.org> */ #include "avformat.h" #include "riff.h" #include <libnut.h> #define ID_STRING "nut/multimedia container" #define ID_LENGTH (strlen(ID_STRING) + 1) typedef struct { nut_context_tt * nut; nut_stream_header_tt * s; } NUTContext; static const AVCodecTag nut_tags[] = { { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') }, { CODEC_ID_MP3, MKTAG('m', 'p', '3', ' ') }, { CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') }, { 0, 0 }, }; #if CONFIG_LIBNUT_MUXER static int av_write(void * h, size_t len, const uint8_t * buf) { ByteIOContext * bc = h; put_buffer(bc, buf, len); //put_flush_packet(bc); return len; } static int nut_write_header(AVFormatContext * avf) { NUTContext * priv = avf->priv_data; ByteIOContext * bc = avf->pb; nut_muxer_opts_tt mopts = { .output = { .priv = bc, .write = av_write, }, .alloc = { av_malloc, av_realloc, av_free }, .write_index = 1, .realtime_stream = 0, .max_distance = 32768, .fti = NULL, }; nut_stream_header_tt * s; int i; priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s); for (i = 0; i < avf->nb_streams; i++) { AVCodecContext * codec = avf->streams[i]->codec; int j; int fourcc = 0; int num, denom, ssize; s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS; if (codec->codec_tag) fourcc = codec->codec_tag; else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id); if (!fourcc) { if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id); if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id); } s[i].fourcc_len = 4; s[i].fourcc = av_malloc(s[i].fourcc_len); for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF; ff_parse_specific_params(codec, &num, &ssize, &denom); av_set_pts_info(avf->streams[i], 60, denom, num); s[i].time_base.num = denom; s[i].time_base.den = num; s[i].fixed_fps = 0; s[i].decode_delay = codec->has_b_frames; s[i].codec_specific_len = codec->extradata_size; s[i].codec_specific = codec->extradata; if (codec->codec_type == AVMEDIA_TYPE_VIDEO) { s[i].width = codec->width; s[i].height = codec->height; s[i].sample_width = 0; s[i].sample_height = 0; s[i].colorspace_type = 0; } else { s[i].samplerate_num = codec->sample_rate; s[i].samplerate_denom = 1; s[i].channel_count = codec->channels; } } s[avf->nb_streams].type = -1; priv->nut = nut_muxer_init(&mopts, s, NULL); return 0; } static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) { NUTContext * priv = avf->priv_data; nut_packet_tt p; p.len = pkt->size; p.stream = pkt->stream_index; p.pts = pkt->pts; p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0; p.next_pts = 0; nut_write_frame_reorder(priv->nut, &p, pkt->data); return 0; } static int nut_write_trailer(AVFormatContext * avf) { ByteIOContext * bc = avf->pb; NUTContext * priv = avf->priv_data; int i; nut_muxer_uninit_reorder(priv->nut); put_flush_packet(bc); for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc); av_freep(&priv->s); return 0; } AVOutputFormat ff_libnut_muxer = { "libnut", "nut format", "video/x-nut", "nut", sizeof(NUTContext), CODEC_ID_VORBIS, CODEC_ID_MPEG4, nut_write_header, nut_write_packet, nut_write_trailer, .flags = AVFMT_GLOBALHEADER, }; #endif /* CONFIG_LIBNUT_MUXER */ static int nut_probe(AVProbeData *p) { if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX; return 0; } static size_t av_read(void * h, size_t len, uint8_t * buf) { ByteIOContext * bc = h; return get_buffer(bc, buf, len); } static off_t av_seek(void * h, long long pos, int whence) { ByteIOContext * bc = h; if (whence == SEEK_END) { pos = url_fsize(bc) + pos; whence = SEEK_SET; } return url_fseek(bc, pos, whence); } static int nut_read_header(AVFormatContext * avf, AVFormatParameters * ap) { NUTContext * priv = avf->priv_data; ByteIOContext * bc = avf->pb; nut_demuxer_opts_tt dopts = { .input = { .priv = bc, .seek = av_seek, .read = av_read, .eof = NULL, .file_pos = 0, }, .alloc = { av_malloc, av_realloc, av_free }, .read_index = 1, .cache_syncpoints = 1, }; nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts); nut_stream_header_tt * s; int ret, i; if ((ret = nut_read_headers(nut, &s, NULL))) { av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret)); nut_demuxer_uninit(nut); return -1; } priv->s = s; for (i = 0; s[i].type != -1 && i < 2; i++) { AVStream * st = av_new_stream(avf, i); int j; for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8); st->codec->has_b_frames = s[i].decode_delay; st->codec->extradata_size = s[i].codec_specific_len; if (st->codec->extradata_size) { st->codec->extradata = av_mallocz(st->codec->extradata_size); memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size); } av_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den); st->start_time = 0; st->duration = s[i].max_pts; st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag); switch(s[i].type) { case NUT_AUDIO_CLASS: st->codec->codec_type = AVMEDIA_TYPE_AUDIO; if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, st->codec->codec_tag); st->codec->channels = s[i].channel_count; st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom; break; case NUT_VIDEO_CLASS: st->codec->codec_type = AVMEDIA_TYPE_VIDEO; if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag); st->codec->width = s[i].width; st->codec->height = s[i].height; st->sample_aspect_ratio.num = s[i].sample_width; st->sample_aspect_ratio.den = s[i].sample_height; break; } if (st->codec->codec_id == CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n"); } return 0; } static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) { NUTContext * priv = avf->priv_data; nut_packet_tt pd; int ret; ret = nut_read_next_packet(priv->nut, &pd); if (ret || av_new_packet(pkt, pd.len) < 0) { if (ret != NUT_ERR_EOF) av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret)); return -1; } if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY; pkt->pts = pd.pts; pkt->stream_index = pd.stream; pkt->pos = url_ftell(avf->pb); ret = nut_read_frame(priv->nut, &pd.len, pkt->data); return ret; } static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) { NUTContext * priv = avf->priv_data; int active_streams[] = { stream_index, -1 }; double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den; if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1; return 0; } static int nut_read_close(AVFormatContext *s) { NUTContext * priv = s->priv_data; nut_demuxer_uninit(priv->nut); return 0; } AVInputFormat ff_libnut_demuxer = { "libnut", NULL_IF_CONFIG_SMALL("NUT format"), sizeof(NUTContext), nut_probe, nut_read_header, nut_read_packet, nut_read_close, nut_read_seek, .extensions = "nut", };