yading@11: /*
yading@11:  * NUT (de)muxing via libnut
yading@11:  * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * NUT demuxing and muxing via libnut.
yading@11:  * @author Oded Shimon <ods15@ods15.dyndns.org>
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "riff.h"
yading@11: #include <libnut.h>
yading@11: 
yading@11: #define ID_STRING "nut/multimedia container"
yading@11: #define ID_LENGTH (strlen(ID_STRING) + 1)
yading@11: 
yading@11: typedef struct {
yading@11:     nut_context_tt * nut;
yading@11:     nut_stream_header_tt * s;
yading@11: } NUTContext;
yading@11: 
yading@11: static const AVCodecTag nut_tags[] = {
yading@11:     { AV_CODEC_ID_MPEG4,  MKTAG('m', 'p', '4', 'v') },
yading@11:     { AV_CODEC_ID_MP3,    MKTAG('m', 'p', '3', ' ') },
yading@11:     { AV_CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
yading@11:     { 0, 0 },
yading@11: };
yading@11: 
yading@11: #if CONFIG_LIBNUT_MUXER
yading@11: static int av_write(void * h, size_t len, const uint8_t * buf) {
yading@11:     AVIOContext * bc = h;
yading@11:     avio_write(bc, buf, len);
yading@11:     //avio_flush(bc);
yading@11:     return len;
yading@11: }
yading@11: 
yading@11: static int nut_write_header(AVFormatContext * avf) {
yading@11:     NUTContext * priv = avf->priv_data;
yading@11:     AVIOContext * bc = avf->pb;
yading@11:     nut_muxer_opts_tt mopts = {
yading@11:         .output = {
yading@11:             .priv = bc,
yading@11:             .write = av_write,
yading@11:         },
yading@11:         .alloc = { av_malloc, av_realloc, av_free },
yading@11:         .write_index = 1,
yading@11:         .realtime_stream = 0,
yading@11:         .max_distance = 32768,
yading@11:         .fti = NULL,
yading@11:     };
yading@11:     nut_stream_header_tt * s;
yading@11:     int i;
yading@11: 
yading@11:     priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s);
yading@11:     if(!s)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     for (i = 0; i < avf->nb_streams; i++) {
yading@11:         AVCodecContext * codec = avf->streams[i]->codec;
yading@11:         int j;
yading@11:         int fourcc = 0;
yading@11:         int num, denom, ssize;
yading@11: 
yading@11:         s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
yading@11: 
yading@11:         if (codec->codec_tag) fourcc = codec->codec_tag;
yading@11:         else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id);
yading@11: 
yading@11:         if (!fourcc) {
yading@11:             if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
yading@11:             if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
yading@11:         }
yading@11: 
yading@11:         s[i].fourcc_len = 4;
yading@11:         s[i].fourcc = av_malloc(s[i].fourcc_len);
yading@11:         for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
yading@11: 
yading@11:         ff_parse_specific_params(codec, &num, &ssize, &denom);
yading@11:         avpriv_set_pts_info(avf->streams[i], 60, denom, num);
yading@11: 
yading@11:         s[i].time_base.num = denom;
yading@11:         s[i].time_base.den = num;
yading@11: 
yading@11:         s[i].fixed_fps = 0;
yading@11:         s[i].decode_delay = codec->has_b_frames;
yading@11:         s[i].codec_specific_len = codec->extradata_size;
yading@11:         s[i].codec_specific = codec->extradata;
yading@11: 
yading@11:         if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
yading@11:             s[i].width = codec->width;
yading@11:             s[i].height = codec->height;
yading@11:             s[i].sample_width = 0;
yading@11:             s[i].sample_height = 0;
yading@11:             s[i].colorspace_type = 0;
yading@11:         } else {
yading@11:             s[i].samplerate_num = codec->sample_rate;
yading@11:             s[i].samplerate_denom = 1;
yading@11:             s[i].channel_count = codec->channels;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     s[avf->nb_streams].type = -1;
yading@11:     priv->nut = nut_muxer_init(&mopts, s, NULL);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
yading@11:     NUTContext * priv = avf->priv_data;
yading@11:     nut_packet_tt p;
yading@11: 
yading@11:     p.len = pkt->size;
yading@11:     p.stream = pkt->stream_index;
yading@11:     p.pts = pkt->pts;
yading@11:     p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
yading@11:     p.next_pts = 0;
yading@11: 
yading@11:     nut_write_frame_reorder(priv->nut, &p, pkt->data);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nut_write_trailer(AVFormatContext * avf) {
yading@11:     AVIOContext * bc = avf->pb;
yading@11:     NUTContext * priv = avf->priv_data;
yading@11:     int i;
yading@11: 
yading@11:     nut_muxer_uninit_reorder(priv->nut);
yading@11:     avio_flush(bc);
yading@11: 
yading@11:     for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
yading@11:     av_freep(&priv->s);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVOutputFormat ff_libnut_muxer = {
yading@11:     .name              = "libnut",
yading@11:     .long_name         = "nut format",
yading@11:     .mime_type         = "video/x-nut",
yading@11:     .extensions        = "nut",
yading@11:     .priv_data_size    = sizeof(NUTContext),
yading@11:     .audio_codec       = AV_CODEC_ID_VORBIS,
yading@11:     .video_codec       = AV_CODEC_ID_MPEG4,
yading@11:     .write_header      = nut_write_header,
yading@11:     .write_packet      = nut_write_packet,
yading@11:     .write_trailer     = nut_write_trailer,
yading@11:     .flags             = AVFMT_GLOBALHEADER,
yading@11: };
yading@11: #endif /* CONFIG_LIBNUT_MUXER */
yading@11: 
yading@11: static int nut_probe(AVProbeData *p) {
yading@11:     if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static size_t av_read(void * h, size_t len, uint8_t * buf) {
yading@11:     AVIOContext * bc = h;
yading@11:     return avio_read(bc, buf, len);
yading@11: }
yading@11: 
yading@11: static off_t av_seek(void * h, long long pos, int whence) {
yading@11:     AVIOContext * bc = h;
yading@11:     if (whence == SEEK_END) {
yading@11:         pos = avio_size(bc) + pos;
yading@11:         whence = SEEK_SET;
yading@11:     }
yading@11:     return avio_seek(bc, pos, whence);
yading@11: }
yading@11: 
yading@11: static int nut_read_header(AVFormatContext * avf) {
yading@11:     NUTContext * priv = avf->priv_data;
yading@11:     AVIOContext * bc = avf->pb;
yading@11:     nut_demuxer_opts_tt dopts = {
yading@11:         .input = {
yading@11:             .priv = bc,
yading@11:             .seek = av_seek,
yading@11:             .read = av_read,
yading@11:             .eof = NULL,
yading@11:             .file_pos = 0,
yading@11:         },
yading@11:         .alloc = { av_malloc, av_realloc, av_free },
yading@11:         .read_index = 1,
yading@11:         .cache_syncpoints = 1,
yading@11:     };
yading@11:     nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
yading@11:     nut_stream_header_tt * s;
yading@11:     int ret, i;
yading@11: 
yading@11:     if(!nut)
yading@11:         return -1;
yading@11: 
yading@11:     if ((ret = nut_read_headers(nut, &s, NULL))) {
yading@11:         av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
yading@11:         nut_demuxer_uninit(nut);
yading@11:         priv->nut = NULL;
yading@11:         return -1;
yading@11:     }
yading@11: 
yading@11:     priv->s = s;
yading@11: 
yading@11:     for (i = 0; s[i].type != -1 && i < 2; i++) {
yading@11:         AVStream * st = avformat_new_stream(avf, NULL);
yading@11:         int j;
yading@11: 
yading@11:         for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8);
yading@11: 
yading@11:         st->codec->has_b_frames = s[i].decode_delay;
yading@11: 
yading@11:         st->codec->extradata_size = s[i].codec_specific_len;
yading@11:         if (st->codec->extradata_size) {
yading@11:             st->codec->extradata = av_mallocz(st->codec->extradata_size);
yading@11:             if(!st->codec->extradata){
yading@11:                 nut_demuxer_uninit(nut);
yading@11:                 priv->nut = NULL;
yading@11:                 return AVERROR(ENOMEM);
yading@11:             }
yading@11:             memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
yading@11:         }
yading@11: 
yading@11:         avpriv_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den);
yading@11:         st->start_time = 0;
yading@11:         st->duration = s[i].max_pts;
yading@11: 
yading@11:         st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag);
yading@11: 
yading@11:         switch(s[i].type) {
yading@11:         case NUT_AUDIO_CLASS:
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:             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);
yading@11: 
yading@11:             st->codec->channels = s[i].channel_count;
yading@11:             st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom;
yading@11:             break;
yading@11:         case NUT_VIDEO_CLASS:
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:             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);
yading@11: 
yading@11:             st->codec->width = s[i].width;
yading@11:             st->codec->height = s[i].height;
yading@11:             st->sample_aspect_ratio.num = s[i].sample_width;
yading@11:             st->sample_aspect_ratio.den = s[i].sample_height;
yading@11:             break;
yading@11:         }
yading@11:         if (st->codec->codec_id == AV_CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
yading@11:     NUTContext * priv = avf->priv_data;
yading@11:     nut_packet_tt pd;
yading@11:     int ret;
yading@11: 
yading@11:     ret = nut_read_next_packet(priv->nut, &pd);
yading@11: 
yading@11:     if (ret || av_new_packet(pkt, pd.len) < 0) {
yading@11:         if (ret != NUT_ERR_EOF)
yading@11:             av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
yading@11:         return -1;
yading@11:     }
yading@11: 
yading@11:     if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY;
yading@11:     pkt->pts = pd.pts;
yading@11:     pkt->stream_index = pd.stream;
yading@11:     pkt->pos = avio_tell(avf->pb);
yading@11: 
yading@11:     ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
yading@11:     NUTContext * priv = avf->priv_data;
yading@11:     int active_streams[] = { stream_index, -1 };
yading@11:     double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den;
yading@11: 
yading@11:     if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nut_read_close(AVFormatContext *s) {
yading@11:     NUTContext * priv = s->priv_data;
yading@11: 
yading@11:     nut_demuxer_uninit(priv->nut);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_libnut_demuxer = {
yading@11:     .name           = "libnut",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("NUT format"),
yading@11:     .priv_data_size = sizeof(NUTContext),
yading@11:     .read_probe     = nut_probe,
yading@11:     .read_header    = nut_read_header,
yading@11:     .read_packet    = nut_read_packet,
yading@11:     .read_close     = nut_read_close,
yading@11:     .read_seek      = nut_read_seek,
yading@11:     .extensions     = "nut",
yading@11: };