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  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 "internal.h"
  30. #include "riff.h"
  31. #include <libnut.h>
  32.  
  33. #define ID_STRING "nut/multimedia container"
  34. #define ID_LENGTH (strlen(ID_STRING) + 1)
  35.  
  36. typedef struct {
  37.     nut_context_tt * nut;
  38.     nut_stream_header_tt * s;
  39. } NUTContext;
  40.  
  41. static const AVCodecTag nut_tags[] = {
  42.     { AV_CODEC_ID_MPEG4,  MKTAG('m', 'p', '4', 'v') },
  43.     { AV_CODEC_ID_MP3,    MKTAG('m', 'p', '3', ' ') },
  44.     { AV_CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
  45.     { 0, 0 },
  46. };
  47.  
  48. #if CONFIG_LIBNUT_MUXER
  49. static int av_write(void * h, size_t len, const uint8_t * buf) {
  50.     AVIOContext * bc = h;
  51.     avio_write(bc, buf, len);
  52.     //avio_flush(bc);
  53.     return len;
  54. }
  55.  
  56. static int nut_write_header(AVFormatContext * avf) {
  57.     NUTContext * priv = avf->priv_data;
  58.     AVIOContext * bc = avf->pb;
  59.     nut_muxer_opts_tt mopts = {
  60.         .output = {
  61.             .priv = bc,
  62.             .write = av_write,
  63.         },
  64.         .alloc = { av_malloc, av_realloc, av_free },
  65.         .write_index = 1,
  66.         .realtime_stream = 0,
  67.         .max_distance = 32768,
  68.         .fti = NULL,
  69.     };
  70.     nut_stream_header_tt * s;
  71.     int i;
  72.  
  73.     priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s);
  74.     if(!s)
  75.         return AVERROR(ENOMEM);
  76.  
  77.     for (i = 0; i < avf->nb_streams; i++) {
  78.         AVCodecContext * codec = avf->streams[i]->codec;
  79.         int j;
  80.         int fourcc = 0;
  81.         int num, denom, ssize;
  82.  
  83.         s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
  84.  
  85.         if (codec->codec_tag) fourcc = codec->codec_tag;
  86.         else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id);
  87.  
  88.         if (!fourcc) {
  89.             if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
  90.             if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
  91.         }
  92.  
  93.         s[i].fourcc_len = 4;
  94.         s[i].fourcc = av_malloc(s[i].fourcc_len);
  95.         for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
  96.  
  97.         ff_parse_specific_params(codec, &num, &ssize, &denom);
  98.         avpriv_set_pts_info(avf->streams[i], 60, denom, num);
  99.  
  100.         s[i].time_base.num = denom;
  101.         s[i].time_base.den = num;
  102.  
  103.         s[i].fixed_fps = 0;
  104.         s[i].decode_delay = codec->has_b_frames;
  105.         s[i].codec_specific_len = codec->extradata_size;
  106.         s[i].codec_specific = codec->extradata;
  107.  
  108.         if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
  109.             s[i].width = codec->width;
  110.             s[i].height = codec->height;
  111.             s[i].sample_width = 0;
  112.             s[i].sample_height = 0;
  113.             s[i].colorspace_type = 0;
  114.         } else {
  115.             s[i].samplerate_num = codec->sample_rate;
  116.             s[i].samplerate_denom = 1;
  117.             s[i].channel_count = codec->channels;
  118.         }
  119.     }
  120.  
  121.     s[avf->nb_streams].type = -1;
  122.     priv->nut = nut_muxer_init(&mopts, s, NULL);
  123.  
  124.     return 0;
  125. }
  126.  
  127. static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
  128.     NUTContext * priv = avf->priv_data;
  129.     nut_packet_tt p;
  130.  
  131.     p.len = pkt->size;
  132.     p.stream = pkt->stream_index;
  133.     p.pts = pkt->pts;
  134.     p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
  135.     p.next_pts = 0;
  136.  
  137.     nut_write_frame_reorder(priv->nut, &p, pkt->data);
  138.  
  139.     return 0;
  140. }
  141.  
  142. static int nut_write_trailer(AVFormatContext * avf) {
  143.     AVIOContext * bc = avf->pb;
  144.     NUTContext * priv = avf->priv_data;
  145.     int i;
  146.  
  147.     nut_muxer_uninit_reorder(priv->nut);
  148.     avio_flush(bc);
  149.  
  150.     for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
  151.     av_freep(&priv->s);
  152.  
  153.     return 0;
  154. }
  155.  
  156. AVOutputFormat ff_libnut_muxer = {
  157.     .name              = "libnut",
  158.     .long_name         = "nut format",
  159.     .mime_type         = "video/x-nut",
  160.     .extensions        = "nut",
  161.     .priv_data_size    = sizeof(NUTContext),
  162.     .audio_codec       = AV_CODEC_ID_VORBIS,
  163.     .video_codec       = AV_CODEC_ID_MPEG4,
  164.     .write_header      = nut_write_header,
  165.     .write_packet      = nut_write_packet,
  166.     .write_trailer     = nut_write_trailer,
  167.     .flags             = AVFMT_GLOBALHEADER,
  168. };
  169. #endif /* CONFIG_LIBNUT_MUXER */
  170.  
  171. static int nut_probe(AVProbeData *p) {
  172.     if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
  173.  
  174.     return 0;
  175. }
  176.  
  177. static size_t av_read(void * h, size_t len, uint8_t * buf) {
  178.     AVIOContext * bc = h;
  179.     return avio_read(bc, buf, len);
  180. }
  181.  
  182. static off_t av_seek(void * h, long long pos, int whence) {
  183.     AVIOContext * bc = h;
  184.     if (whence == SEEK_END) {
  185.         pos = avio_size(bc) + pos;
  186.         whence = SEEK_SET;
  187.     }
  188.     return avio_seek(bc, pos, whence);
  189. }
  190.  
  191. static int nut_read_header(AVFormatContext * avf) {
  192.     NUTContext * priv = avf->priv_data;
  193.     AVIOContext * bc = avf->pb;
  194.     nut_demuxer_opts_tt dopts = {
  195.         .input = {
  196.             .priv = bc,
  197.             .seek = av_seek,
  198.             .read = av_read,
  199.             .eof = NULL,
  200.             .file_pos = 0,
  201.         },
  202.         .alloc = { av_malloc, av_realloc, av_free },
  203.         .read_index = 1,
  204.         .cache_syncpoints = 1,
  205.     };
  206.     nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
  207.     nut_stream_header_tt * s;
  208.     int ret, i;
  209.  
  210.     if(!nut)
  211.         return -1;
  212.  
  213.     if ((ret = nut_read_headers(nut, &s, NULL))) {
  214.         av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
  215.         nut_demuxer_uninit(nut);
  216.         priv->nut = NULL;
  217.         return -1;
  218.     }
  219.  
  220.     priv->s = s;
  221.  
  222.     for (i = 0; s[i].type != -1 && i < 2; i++) {
  223.         AVStream * st = avformat_new_stream(avf, NULL);
  224.         int j;
  225.  
  226.         if (!st)
  227.             return AVERROR(ENOMEM);
  228.  
  229.         for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8);
  230.  
  231.         st->codec->has_b_frames = s[i].decode_delay;
  232.  
  233.         st->codec->extradata_size = s[i].codec_specific_len;
  234.         if (st->codec->extradata_size) {
  235.             if(ff_alloc_extradata(st->codec, st->codec->extradata_size)){
  236.                 nut_demuxer_uninit(nut);
  237.                 priv->nut = NULL;
  238.                 return AVERROR(ENOMEM);
  239.             }
  240.             memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
  241.         }
  242.  
  243.         avpriv_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den);
  244.         st->start_time = 0;
  245.         st->duration = s[i].max_pts;
  246.  
  247.         st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag);
  248.  
  249.         switch(s[i].type) {
  250.         case NUT_AUDIO_CLASS:
  251.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  252.             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);
  253.  
  254.             st->codec->channels = s[i].channel_count;
  255.             st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom;
  256.             break;
  257.         case NUT_VIDEO_CLASS:
  258.             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  259.             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);
  260.  
  261.             st->codec->width = s[i].width;
  262.             st->codec->height = s[i].height;
  263.             st->sample_aspect_ratio.num = s[i].sample_width;
  264.             st->sample_aspect_ratio.den = s[i].sample_height;
  265.             break;
  266.         }
  267.         if (st->codec->codec_id == AV_CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
  268.     }
  269.  
  270.     return 0;
  271. }
  272.  
  273. static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
  274.     NUTContext * priv = avf->priv_data;
  275.     nut_packet_tt pd;
  276.     int ret;
  277.  
  278.     ret = nut_read_next_packet(priv->nut, &pd);
  279.  
  280.     if (ret || av_new_packet(pkt, pd.len) < 0) {
  281.         if (ret != NUT_ERR_EOF)
  282.             av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
  283.         return -1;
  284.     }
  285.  
  286.     if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY;
  287.     pkt->pts = pd.pts;
  288.     pkt->stream_index = pd.stream;
  289.     pkt->pos = avio_tell(avf->pb);
  290.  
  291.     ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
  292.  
  293.     return ret;
  294. }
  295.  
  296. static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
  297.     NUTContext * priv = avf->priv_data;
  298.     int active_streams[] = { stream_index, -1 };
  299.     double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den;
  300.  
  301.     if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
  302.  
  303.     return 0;
  304. }
  305.  
  306. static int nut_read_close(AVFormatContext *s) {
  307.     NUTContext * priv = s->priv_data;
  308.  
  309.     nut_demuxer_uninit(priv->nut);
  310.  
  311.     return 0;
  312. }
  313.  
  314. AVInputFormat ff_libnut_demuxer = {
  315.     .name           = "libnut",
  316.     .long_name      = NULL_IF_CONFIG_SMALL("NUT format"),
  317.     .priv_data_size = sizeof(NUTContext),
  318.     .read_probe     = nut_probe,
  319.     .read_header    = nut_read_header,
  320.     .read_packet    = nut_read_packet,
  321.     .read_close     = nut_read_close,
  322.     .read_seek      = nut_read_seek,
  323.     .extensions     = "nut",
  324. };
  325.