diff options
Diffstat (limited to 'libavformat/libnut.c')
-rw-r--r-- | libavformat/libnut.c | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/libavformat/libnut.c b/libavformat/libnut.c new file mode 100644 index 0000000..be8f3cb --- /dev/null +++ b/libavformat/libnut.c @@ -0,0 +1,324 @@ +/* + * 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 "internal.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[] = { + { AV_CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') }, + { AV_CODEC_ID_MP3, MKTAG('m', 'p', '3', ' ') }, + { AV_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) { + AVIOContext * bc = h; + avio_write(bc, buf, len); + //avio_flush(bc); + return len; +} + +static int nut_write_header(AVFormatContext * avf) { + NUTContext * priv = avf->priv_data; + AVIOContext * 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); + if(!s) + return AVERROR(ENOMEM); + + 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); + avpriv_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) { + AVIOContext * bc = avf->pb; + NUTContext * priv = avf->priv_data; + int i; + + nut_muxer_uninit_reorder(priv->nut); + avio_flush(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 = { + .name = "libnut", + .long_name = "nut format", + .mime_type = "video/x-nut", + .extensions = "nut", + .priv_data_size = sizeof(NUTContext), + .audio_codec = AV_CODEC_ID_VORBIS, + .video_codec = AV_CODEC_ID_MPEG4, + .write_header = nut_write_header, + .write_packet = nut_write_packet, + .write_trailer = 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) { + AVIOContext * bc = h; + return avio_read(bc, buf, len); +} + +static off_t av_seek(void * h, long long pos, int whence) { + AVIOContext * bc = h; + if (whence == SEEK_END) { + pos = avio_size(bc) + pos; + whence = SEEK_SET; + } + return avio_seek(bc, pos, whence); +} + +static int nut_read_header(AVFormatContext * avf) { + NUTContext * priv = avf->priv_data; + AVIOContext * 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(!nut) + return -1; + + 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); + priv->nut = NULL; + return -1; + } + + priv->s = s; + + for (i = 0; s[i].type != -1 && i < 2; i++) { + AVStream * st = avformat_new_stream(avf, NULL); + int j; + + if (!st) + return AVERROR(ENOMEM); + + 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) { + if(ff_alloc_extradata(st->codec, st->codec->extradata_size)){ + nut_demuxer_uninit(nut); + priv->nut = NULL; + return AVERROR(ENOMEM); + } + memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size); + } + + avpriv_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 == AV_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 == AV_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 == AV_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 = avio_tell(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 = { + .name = "libnut", + .long_name = NULL_IF_CONFIG_SMALL("NUT format"), + .priv_data_size = sizeof(NUTContext), + .read_probe = nut_probe, + .read_header = nut_read_header, + .read_packet = nut_read_packet, + .read_close = nut_read_close, + .read_seek = nut_read_seek, + .extensions = "nut", +}; |