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FFmpeg/libavformat/nutenc.c

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  1. /*

  2.  * nut muxer

  3.  * Copyright (c) 2004-2007 Michael Niedermayer

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include <stdint.h>

  23. 

  24. #include "libavutil/intreadwrite.h"

  25. #include "libavutil/mathematics.h"

  26. #include "libavutil/tree.h"

  27. #include "libavutil/dict.h"

  28. #include "libavcodec/mpegaudiodata.h"

  29. #include "nut.h"

  30. #include "internal.h"

  31. #include "avio_internal.h"

  32. #include "riff.h"

  33. 

  34. static int find_expected_header(AVCodecContext *c, int size, int key_frame,

  35.                                 uint8_t out[64])

  36. {

  37.     int sample_rate = c->sample_rate;

  38. 

  39.     if (size > 4096)

  40.         return 0;

  41. 

  42.     AV_WB24(out, 1);

  43. 

  44.     if (c->codec_id == AV_CODEC_ID_MPEG4) {

  45.         if (key_frame) {

  46.             return 3;

  47.         } else {

  48.             out[3] = 0xB6;

  49.             return 4;

  50.         }

  51.     } else if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO ||

  52.                c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {

  53.         return 3;

  54.     } else if (c->codec_id == AV_CODEC_ID_H264) {

  55.         return 3;

  56.     } else if (c->codec_id == AV_CODEC_ID_MP3 ||

  57.                c->codec_id == AV_CODEC_ID_MP2) {

  58.         int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;

  59.         int layer           = c->codec_id == AV_CODEC_ID_MP3 ? 3 : 2;

  60.         unsigned int header = 0xFFF00000;

  61. 

  62.         lsf           = sample_rate < (24000 + 32000) / 2;

  63.         mpeg25        = sample_rate < (12000 + 16000) / 2;

  64.         sample_rate <<= lsf + mpeg25;

  65.         if (sample_rate < (32000 + 44100) / 2)

  66.             sample_rate_index = 2;

  67.         else if (sample_rate < (44100 + 48000) / 2)

  68.             sample_rate_index = 0;

  69.         else

  70.             sample_rate_index = 1;

  71. 

  72.         sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);

  73. 

  74.         for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) {

  75.             frame_size =

  76.                 avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1];

  77.             frame_size = (frame_size * 144000) / (sample_rate << lsf) +

  78.                 (bitrate_index & 1);

  79. 

  80.             if (frame_size == size)

  81.                 break;

  82.         }

  83. 

  84.         header |= (!lsf) << 19;

  85.         header |= (4 - layer) << 17;

  86.         header |= 1 << 16; //no crc

  87.         AV_WB32(out, header);

  88.         if (size <= 0)

  89.             return 2;  //we guess there is no crc, if there is one the user clearly does not care about overhead

  90.         if (bitrate_index == 30)

  91.             return -1;  //something is wrong ...

  92. 

  93.         header |= (bitrate_index >> 1) << 12;

  94.         header |= sample_rate_index << 10;

  95.         header |= (bitrate_index & 1) << 9;

  96. 

  97.         return 2; //FIXME actually put the needed ones in build_elision_headers()

  98.         //return 3; //we guess that the private bit is not set

  99. //FIXME the above assumptions should be checked, if these turn out false too often something should be done

  100.     }

  101.     return 0;

  102. }

  103. 

  104. static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size,

  105.                            int frame_type)

  106. {

  107.     NUTContext *nut = s->priv_data;

  108.     uint8_t out[64];

  109.     int i;

  110.     int len = find_expected_header(c, size, frame_type, out);

  111. 

  112.     for (i = 1; i < nut->header_count; i++) {

  113.         if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) {

  114.             return i;

  115.         }

  116.     }

  117. 

  118.     return 0;

  119. }

  120. 

  121. static void build_elision_headers(AVFormatContext *s)

  122. {

  123.     NUTContext *nut = s->priv_data;

  124.     int i;

  125.     //FIXME this is lame

  126.     //FIXME write a 2pass mode to find the maximal headers

  127.     static const uint8_t headers[][5] = {

  128.         { 3, 0x00, 0x00, 0x01 },

  129.         { 4, 0x00, 0x00, 0x01, 0xB6},

  130.         { 2, 0xFF, 0xFA }, //mp3+crc

  131.         { 2, 0xFF, 0xFB }, //mp3

  132.         { 2, 0xFF, 0xFC }, //mp2+crc

  133.         { 2, 0xFF, 0xFD }, //mp2

  134.     };

  135. 

  136.     nut->header_count = 7;

  137.     for (i = 1; i < nut->header_count; i++) {

  138.         nut->header_len[i] = headers[i - 1][0];

  139.         nut->header[i]     = &headers[i - 1][1];

  140.     }

  141. }

  142. 

  143. static void build_frame_code(AVFormatContext *s)

  144. {

  145.     NUTContext *nut = s->priv_data;

  146.     int key_frame, index, pred, stream_id;

  147.     int start = 1;

  148.     int end   = 254;

  149.     int keyframe_0_esc = s->nb_streams > 2;

  150.     int pred_table[10];

  151.     FrameCode *ft;

  152. 

  153.     ft            = &nut->frame_code[start];

  154.     ft->flags     = FLAG_CODED;

  155.     ft->size_mul  = 1;

  156.     ft->pts_delta = 1;

  157.     start++;

  158. 

  159.     if (keyframe_0_esc) {

  160.         /* keyframe = 0 escape */

  161.         FrameCode *ft = &nut->frame_code[start];

  162.         ft->flags    = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;

  163.         ft->size_mul = 1;

  164.         start++;

  165.     }

  166. 

  167.     for (stream_id = 0; stream_id < s->nb_streams; stream_id++) {

  168.         int start2 = start + (end - start) * stream_id       / s->nb_streams;

  169.         int end2   = start + (end - start) * (stream_id + 1) / s->nb_streams;

  170.         AVCodecContext *codec = s->streams[stream_id]->codec;

  171.         int is_audio          = codec->codec_type == AVMEDIA_TYPE_AUDIO;

  172.         int intra_only        = /*codec->intra_only || */ is_audio;

  173.         int pred_count;

  174. 

  175.         for (key_frame = 0; key_frame < 2; key_frame++) {

  176.             if (!intra_only || !keyframe_0_esc || key_frame != 0) {

  177.                 FrameCode *ft = &nut->frame_code[start2];

  178.                 ft->flags     = FLAG_KEY * key_frame;

  179.                 ft->flags    |= FLAG_SIZE_MSB | FLAG_CODED_PTS;

  180.                 ft->stream_id = stream_id;

  181.                 ft->size_mul  = 1;

  182.                 if (is_audio)

  183.                     ft->header_idx = find_header_idx(s, codec, -1, key_frame);

  184.                 start2++;

  185.             }

  186.         }

  187. 

  188.         key_frame = intra_only;

  189.         if (is_audio) {

  190.             int frame_bytes = codec->frame_size * (int64_t)codec->bit_rate /

  191.                               (8 * codec->sample_rate);

  192.             int pts;

  193.             for (pts = 0; pts < 2; pts++)

  194.                 for (pred = 0; pred < 2; pred++) {

  195.                     FrameCode *ft = &nut->frame_code[start2];

  196.                     ft->flags      = FLAG_KEY * key_frame;

  197.                     ft->stream_id  = stream_id;

  198.                     ft->size_mul   = frame_bytes + 2;

  199.                     ft->size_lsb   = frame_bytes + pred;

  200.                     ft->pts_delta  = pts;

  201.                     ft->header_idx = find_header_idx(s, codec, frame_bytes + pred, key_frame);

  202.                     start2++;

  203.                 }

  204.         } else {

  205.             FrameCode *ft = &nut->frame_code[start2];

  206.             ft->flags     = FLAG_KEY | FLAG_SIZE_MSB;

  207.             ft->stream_id = stream_id;

  208.             ft->size_mul  = 1;

  209.             ft->pts_delta = 1;

  210.             start2++;

  211.         }

  212. 

  213.         if (codec->has_b_frames) {

  214.             pred_count    = 5;

  215.             pred_table[0] = -2;

  216.             pred_table[1] = -1;

  217.             pred_table[2] = 1;

  218.             pred_table[3] = 3;

  219.             pred_table[4] = 4;

  220.         } else if (codec->codec_id == AV_CODEC_ID_VORBIS) {

  221.             pred_count    = 3;

  222.             pred_table[0] = 2;

  223.             pred_table[1] = 9;

  224.             pred_table[2] = 16;

  225.         } else {

  226.             pred_count    = 1;

  227.             pred_table[0] = 1;

  228.         }

  229. 

  230.         for (pred = 0; pred < pred_count; pred++) {

  231.             int start3 = start2 + (end2 - start2) * pred / pred_count;

  232.             int end3   = start2 + (end2 - start2) * (pred + 1) / pred_count;

  233. 

  234.             for (index = start3; index < end3; index++) {

  235.                 FrameCode *ft = &nut->frame_code[index];

  236.                 ft->flags     = FLAG_KEY * key_frame;

  237.                 ft->flags    |= FLAG_SIZE_MSB;

  238.                 ft->stream_id = stream_id;

  239. //FIXME use single byte size and pred from last

  240.                 ft->size_mul  = end3 - start3;

  241.                 ft->size_lsb  = index - start3;

  242.                 ft->pts_delta = pred_table[pred];

  243.                 if (is_audio)

  244.                     ft->header_idx = find_header_idx(s, codec, -1, key_frame);

  245.             }

  246.         }

  247.     }

  248.     memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'],

  249.             sizeof(FrameCode) * (255 - 'N'));

  250.     nut->frame_code[0].flags       =

  251.         nut->frame_code[255].flags =

  252.         nut->frame_code['N'].flags = FLAG_INVALID;

  253. }

  254. 

  255. static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc,

  256.                    uint64_t val)

  257. {

  258.     val *= nut->time_base_count;

  259.     val += time_base - nut->time_base;

  260.     ff_put_v(bc, val);

  261. }

  262. /**

  263.  * Store a string as vb.

  264.  */

  265. static void put_str(AVIOContext *bc, const char *string)

  266. {

  267.     int len = strlen(string);

  268. 

  269.     ff_put_v(bc, len);

  270.     avio_write(bc, string, len);

  271. }

  272. 

  273. static void put_s(AVIOContext *bc, int64_t val)

  274. {

  275.     ff_put_v(bc, 2 * FFABS(val) - (val > 0));

  276. }

  277. 

  278. #ifdef TRACE

  279. static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file,

  280.                                   const char *func, int line)

  281. {

  282.     av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);

  283. 

  284.     ff_put_v(bc, v);

  285. }

  286. 

  287. static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file,

  288.                                const char *func, int line)

  289. {

  290.     av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);

  291. 

  292.     put_s(bc, v);

  293. }

  294. #define ff_put_v(bc, v)  ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)

  295. #define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)

  296. #endif

  297. 

  298. //FIXME remove calculate_checksum

  299. static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc,

  300.                        int calculate_checksum, uint64_t startcode)

  301. {

  302.     uint8_t *dyn_buf = NULL;

  303.     int dyn_size     = avio_close_dyn_buf(dyn_bc, &dyn_buf);

  304.     int forw_ptr     = dyn_size + 4 * calculate_checksum;

  305. 

  306.     if (forw_ptr > 4096)

  307.         ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  308.     avio_wb64(bc, startcode);

  309.     ff_put_v(bc, forw_ptr);

  310.     if (forw_ptr > 4096)

  311.         avio_wl32(bc, ffio_get_checksum(bc));

  312. 

  313.     if (calculate_checksum)

  314.         ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  315.     avio_write(bc, dyn_buf, dyn_size);

  316.     if (calculate_checksum)

  317.         avio_wl32(bc, ffio_get_checksum(bc));

  318. 

  319.     av_free(dyn_buf);

  320. }

  321. 

  322. static void write_mainheader(NUTContext *nut, AVIOContext *bc)

  323. {

  324.     int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields,

  325.         tmp_head_idx;

  326.     int64_t tmp_match;

  327. 

  328.     ff_put_v(bc, NUT_VERSION);

  329.     ff_put_v(bc, nut->avf->nb_streams);

  330.     ff_put_v(bc, nut->max_distance);

  331.     ff_put_v(bc, nut->time_base_count);

  332. 

  333.     for (i = 0; i < nut->time_base_count; i++) {

  334.         ff_put_v(bc, nut->time_base[i].num);

  335.         ff_put_v(bc, nut->time_base[i].den);

  336.     }

  337. 

  338.     tmp_pts      = 0;

  339.     tmp_mul      = 1;

  340.     tmp_stream   = 0;

  341.     tmp_match    = 1 - (1LL << 62);

  342.     tmp_head_idx = 0;

  343.     for (i = 0; i < 256; ) {

  344.         tmp_fields = 0;

  345.         tmp_size   = 0;

  346. //        tmp_res=0;

  347.         if (tmp_pts != nut->frame_code[i].pts_delta)

  348.             tmp_fields = 1;

  349.         if (tmp_mul != nut->frame_code[i].size_mul)

  350.             tmp_fields = 2;

  351.         if (tmp_stream != nut->frame_code[i].stream_id)

  352.             tmp_fields = 3;

  353.         if (tmp_size != nut->frame_code[i].size_lsb)

  354.             tmp_fields = 4;

  355. //        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;

  356.         if (tmp_head_idx != nut->frame_code[i].header_idx)

  357.             tmp_fields = 8;

  358. 

  359.         tmp_pts    = nut->frame_code[i].pts_delta;

  360.         tmp_flags  = nut->frame_code[i].flags;

  361.         tmp_stream = nut->frame_code[i].stream_id;

  362.         tmp_mul    = nut->frame_code[i].size_mul;

  363.         tmp_size   = nut->frame_code[i].size_lsb;

  364. //        tmp_res   = nut->frame_code[i].res;

  365.         tmp_head_idx = nut->frame_code[i].header_idx;

  366. 

  367.         for (j = 0; i < 256; j++, i++) {

  368.             if (i == 'N') {

  369.                 j--;

  370.                 continue;

  371.             }

  372.             if (nut->frame_code[i].pts_delta  != tmp_pts      ||

  373.                 nut->frame_code[i].flags      != tmp_flags    ||

  374.                 nut->frame_code[i].stream_id  != tmp_stream   ||

  375.                 nut->frame_code[i].size_mul   != tmp_mul      ||

  376.                 nut->frame_code[i].size_lsb   != tmp_size + j ||

  377. //              nut->frame_code[i].res        != tmp_res      ||

  378.                 nut->frame_code[i].header_idx != tmp_head_idx)

  379.                 break;

  380.         }

  381.         if (j != tmp_mul - tmp_size)

  382.             tmp_fields = 6;

  383. 

  384.         ff_put_v(bc, tmp_flags);

  385.         ff_put_v(bc, tmp_fields);

  386.         if (tmp_fields > 0)

  387.             put_s(bc, tmp_pts);

  388.         if (tmp_fields > 1)

  389.             ff_put_v(bc, tmp_mul);

  390.         if (tmp_fields > 2)

  391.             ff_put_v(bc, tmp_stream);

  392.         if (tmp_fields > 3)

  393.             ff_put_v(bc, tmp_size);

  394.         if (tmp_fields > 4)

  395.             ff_put_v(bc, 0 /*tmp_res*/);

  396.         if (tmp_fields > 5)

  397.             ff_put_v(bc, j);

  398.         if (tmp_fields > 6)

  399.             ff_put_v(bc, tmp_match);

  400.         if (tmp_fields > 7)

  401.             ff_put_v(bc, tmp_head_idx);

  402.     }

  403.     ff_put_v(bc, nut->header_count - 1);

  404.     for (i = 1; i < nut->header_count; i++) {

  405.         ff_put_v(bc, nut->header_len[i]);

  406.         avio_write(bc, nut->header[i], nut->header_len[i]);

  407.     }

  408. }

  409. 

  410. static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc,

  411.                               AVStream *st, int i)

  412. {

  413.     NUTContext *nut       = avctx->priv_data;

  414.     AVCodecContext *codec = st->codec;

  415.     unsigned codec_tag    = av_codec_get_tag(ff_nut_codec_tags, codec->codec_id);

  416. 

  417.     ff_put_v(bc, i);

  418.     switch (codec->codec_type) {

  419.     case AVMEDIA_TYPE_VIDEO:

  420.         ff_put_v(bc, 0);

  421.         break;

  422.     case AVMEDIA_TYPE_AUDIO:

  423.         ff_put_v(bc, 1);

  424.         break;

  425.     case AVMEDIA_TYPE_SUBTITLE:

  426.         ff_put_v(bc, 2);

  427.         break;

  428.     default:

  429.         ff_put_v(bc, 3);

  430.         break;

  431.     }

  432.     ff_put_v(bc, 4);

  433. 

  434.     if (!codec_tag || codec->codec_id == AV_CODEC_ID_RAWVIDEO)

  435.         codec_tag = codec->codec_tag;

  436. 

  437.     if (codec_tag) {

  438.         avio_wl32(bc, codec_tag);

  439.     } else {

  440.         av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);

  441.         return AVERROR(EINVAL);

  442.     }

  443. 

  444.     ff_put_v(bc, nut->stream[i].time_base - nut->time_base);

  445.     ff_put_v(bc, nut->stream[i].msb_pts_shift);

  446.     ff_put_v(bc, nut->stream[i].max_pts_distance);

  447.     ff_put_v(bc, codec->has_b_frames);

  448.     avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */

  449. 

  450.     ff_put_v(bc, codec->extradata_size);

  451.     avio_write(bc, codec->extradata, codec->extradata_size);

  452. 

  453.     switch (codec->codec_type) {

  454.     case AVMEDIA_TYPE_AUDIO:

  455.         ff_put_v(bc, codec->sample_rate);

  456.         ff_put_v(bc, 1);

  457.         ff_put_v(bc, codec->channels);

  458.         break;

  459.     case AVMEDIA_TYPE_VIDEO:

  460.         ff_put_v(bc, codec->width);

  461.         ff_put_v(bc, codec->height);

  462. 

  463.         if (st->sample_aspect_ratio.num <= 0 ||

  464.             st->sample_aspect_ratio.den <= 0) {

  465.             ff_put_v(bc, 0);

  466.             ff_put_v(bc, 0);

  467.         } else {

  468.             ff_put_v(bc, st->sample_aspect_ratio.num);

  469.             ff_put_v(bc, st->sample_aspect_ratio.den);

  470.         }

  471.         ff_put_v(bc, 0); /* csp type -- unknown */

  472.         break;

  473.     default:

  474.         break;

  475.     }

  476.     return 0;

  477. }

  478. 

  479. static int add_info(AVIOContext *bc, const char *type, const char *value)

  480. {

  481.     put_str(bc, type);

  482.     put_s(bc, -1);

  483.     put_str(bc, value);

  484.     return 1;

  485. }

  486. 

  487. static int write_globalinfo(NUTContext *nut, AVIOContext *bc)

  488. {

  489.     AVFormatContext *s   = nut->avf;

  490.     AVDictionaryEntry *t = NULL;

  491.     AVIOContext *dyn_bc;

  492.     uint8_t *dyn_buf = NULL;

  493.     int count        = 0, dyn_size;

  494.     int ret          = avio_open_dyn_buf(&dyn_bc);

  495.     if (ret < 0)

  496.         return ret;

  497. 

  498.     while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))

  499.         count += add_info(dyn_bc, t->key, t->value);

  500. 

  501.     ff_put_v(bc, 0); //stream_if_plus1

  502.     ff_put_v(bc, 0); //chapter_id

  503.     ff_put_v(bc, 0); //timestamp_start

  504.     ff_put_v(bc, 0); //length

  505. 

  506.     ff_put_v(bc, count);

  507. 

  508.     dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);

  509.     avio_write(bc, dyn_buf, dyn_size);

  510.     av_free(dyn_buf);

  511.     return 0;

  512. }

  513. 

  514. static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){

  515.     AVFormatContext *s= nut->avf;

  516.     AVStream* st = s->streams[stream_id];

  517.     AVIOContext *dyn_bc;

  518.     uint8_t *dyn_buf=NULL;

  519.     int count=0, dyn_size, i;

  520.     int ret = avio_open_dyn_buf(&dyn_bc);

  521.     if(ret < 0)

  522.         return ret;

  523. 

  524.     for (i=0; ff_nut_dispositions[i].flag; ++i) {

  525.         if (st->disposition & ff_nut_dispositions[i].flag)

  526.             count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);

  527.     }

  528.     dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);

  529. 

  530.     if (count) {

  531.         ff_put_v(bc, stream_id + 1); //stream_id_plus1

  532.         ff_put_v(bc, 0); //chapter_id

  533.         ff_put_v(bc, 0); //timestamp_start

  534.         ff_put_v(bc, 0); //length

  535. 

  536.         ff_put_v(bc, count);

  537. 

  538.         avio_write(bc, dyn_buf, dyn_size);

  539.     }

  540. 

  541.     av_free(dyn_buf);

  542.     return count;

  543. }

  544. 

  545. static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)

  546. {

  547.     AVIOContext *dyn_bc;

  548.     uint8_t *dyn_buf     = NULL;

  549.     AVDictionaryEntry *t = NULL;

  550.     AVChapter *ch        = nut->avf->chapters[id];

  551.     int ret, dyn_size, count = 0;

  552. 

  553.     ret = avio_open_dyn_buf(&dyn_bc);

  554.     if (ret < 0)

  555.         return ret;

  556. 

  557.     ff_put_v(bc, 0);                                        // stream_id_plus1

  558.     put_s(bc, id + 1);                                      // chapter_id

  559.     put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start

  560.     ff_put_v(bc, ch->end - ch->start);                      // chapter_len

  561. 

  562.     while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))

  563.         count += add_info(dyn_bc, t->key, t->value);

  564. 

  565.     ff_put_v(bc, count);

  566. 

  567.     dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);

  568.     avio_write(bc, dyn_buf, dyn_size);

  569.     av_freep(&dyn_buf);

  570.     return 0;

  571. }

  572. 

  573. static int write_headers(AVFormatContext *avctx, AVIOContext *bc)

  574. {

  575.     NUTContext *nut = avctx->priv_data;

  576.     AVIOContext *dyn_bc;

  577.     int i, ret;

  578. 

  579.     ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);

  580. 

  581.     ret = avio_open_dyn_buf(&dyn_bc);

  582.     if (ret < 0)

  583.         return ret;

  584.     write_mainheader(nut, dyn_bc);

  585.     put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);

  586. 

  587.     for (i = 0; i < nut->avf->nb_streams; i++) {

  588.         ret = avio_open_dyn_buf(&dyn_bc);

  589.         if (ret < 0)

  590.             return ret;

  591.         ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i);

  592.         if (ret < 0)

  593.             return ret;

  594.         put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);

  595.     }

  596. 

  597.     ret = avio_open_dyn_buf(&dyn_bc);

  598.     if (ret < 0)

  599.         return ret;

  600.     write_globalinfo(nut, dyn_bc);

  601.     put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);

  602. 

  603.     for (i = 0; i < nut->avf->nb_streams; i++) {

  604.         ret = avio_open_dyn_buf(&dyn_bc);

  605.         if (ret < 0)

  606.             return ret;

  607.         ret = write_streaminfo(nut, dyn_bc, i);

  608.         if (ret < 0)

  609.             return ret;

  610.         if (ret > 0)

  611.             put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);

  612.         else {

  613.             uint8_t *buf;

  614.             avio_close_dyn_buf(dyn_bc, &buf);

  615.             av_free(buf);

  616.         }

  617.     }

  618. 

  619.     for (i = 0; i < nut->avf->nb_chapters; i++) {

  620.         ret = avio_open_dyn_buf(&dyn_bc);

  621.         if (ret < 0)

  622.             return ret;

  623.         ret = write_chapter(nut, dyn_bc, i);

  624.         if (ret < 0) {

  625.             uint8_t *buf;

  626.             avio_close_dyn_buf(dyn_bc, &buf);

  627.             av_freep(&buf);

  628.             return ret;

  629.         }

  630.         put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);

  631.     }

  632. 

  633.     nut->last_syncpoint_pos = INT_MIN;

  634.     nut->header_count++;

  635.     return 0;

  636. }

  637. 

  638. static int nut_write_header(AVFormatContext *s)

  639. {

  640.     NUTContext *nut = s->priv_data;

  641.     AVIOContext *bc = s->pb;

  642.     int i, j, ret;

  643. 

  644.     nut->avf = s;

  645. 

  646.     nut->stream = av_mallocz(sizeof(StreamContext) * s->nb_streams);

  647.     if (s->nb_chapters)

  648.         nut->chapter = av_mallocz(sizeof(ChapterContext) * s->nb_chapters);

  649.     nut->time_base = av_mallocz(sizeof(AVRational) * (s->nb_streams +

  650.                                                       s->nb_chapters));

  651.     if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) {

  652.         av_freep(&nut->stream);

  653.         av_freep(&nut->chapter);

  654.         av_freep(&nut->time_base);

  655.         return AVERROR(ENOMEM);

  656.     }

  657. 

  658.     for (i = 0; i < s->nb_streams; i++) {

  659.         AVStream *st = s->streams[i];

  660.         int ssize;

  661.         AVRational time_base;

  662.         ff_parse_specific_params(st->codec, &time_base.den, &ssize,

  663.                                  &time_base.num);

  664. 

  665.         avpriv_set_pts_info(st, 64, time_base.num, time_base.den);

  666. 

  667.         for (j = 0; j < nut->time_base_count; j++)

  668.             if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) {

  669.                 break;

  670.             }

  671.         nut->time_base[j]        = time_base;

  672.         nut->stream[i].time_base = &nut->time_base[j];

  673.         if (j == nut->time_base_count)

  674.             nut->time_base_count++;

  675. 

  676.         if (INT64_C(1000) * time_base.num >= time_base.den)

  677.             nut->stream[i].msb_pts_shift = 7;

  678.         else

  679.             nut->stream[i].msb_pts_shift = 14;

  680.         nut->stream[i].max_pts_distance =

  681.             FFMAX(time_base.den, time_base.num) / time_base.num;

  682.     }

  683. 

  684.     for (i = 0; i < s->nb_chapters; i++) {

  685.         AVChapter *ch = s->chapters[i];

  686. 

  687.         for (j = 0; j < nut->time_base_count; j++)

  688.             if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))

  689.                 break;

  690. 

  691.         nut->time_base[j]         = ch->time_base;

  692.         nut->chapter[i].time_base = &nut->time_base[j];

  693.         if (j == nut->time_base_count)

  694.             nut->time_base_count++;

  695.     }

  696. 

  697.     nut->max_distance = MAX_DISTANCE;

  698.     build_elision_headers(s);

  699.     build_frame_code(s);

  700.     assert(nut->frame_code['N'].flags == FLAG_INVALID);

  701. 

  702.     avio_write(bc, ID_STRING, strlen(ID_STRING));

  703.     avio_w8(bc, 0);

  704. 

  705.     if ((ret = write_headers(s, bc)) < 0)

  706.         return ret;

  707. 

  708.     avio_flush(bc);

  709. 

  710.     //FIXME index

  711. 

  712.     return 0;

  713. }

  714. 

  715. static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc,

  716.                             AVPacket *pkt)

  717. {

  718.     int flags = 0;

  719. 

  720.     if (pkt->flags & AV_PKT_FLAG_KEY)

  721.         flags |= FLAG_KEY;

  722.     if (pkt->stream_index != fc->stream_id)

  723.         flags |= FLAG_STREAM_ID;

  724.     if (pkt->size / fc->size_mul)

  725.         flags |= FLAG_SIZE_MSB;

  726.     if (pkt->pts - nus->last_pts != fc->pts_delta)

  727.         flags |= FLAG_CODED_PTS;

  728.     if (pkt->size > 2 * nut->max_distance)

  729.         flags |= FLAG_CHECKSUM;

  730.     if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance)

  731.         flags |= FLAG_CHECKSUM;

  732.     if (pkt->size < nut->header_len[fc->header_idx] ||

  733.         (pkt->size > 4096 && fc->header_idx)        ||

  734.         memcmp(pkt->data, nut->header[fc->header_idx],

  735.                nut->header_len[fc->header_idx]))

  736.         flags |= FLAG_HEADER_IDX;

  737. 

  738.     return flags | (fc->flags & FLAG_CODED);

  739. }

  740. 

  741. static int find_best_header_idx(NUTContext *nut, AVPacket *pkt)

  742. {

  743.     int i;

  744.     int best_i   = 0;

  745.     int best_len = 0;

  746. 

  747.     if (pkt->size > 4096)

  748.         return 0;

  749. 

  750.     for (i = 1; i < nut->header_count; i++)

  751.         if (pkt->size >= nut->header_len[i]

  752.             && nut->header_len[i] > best_len

  753.             && !memcmp(pkt->data, nut->header[i], nut->header_len[i])) {

  754.             best_i   = i;

  755.             best_len = nut->header_len[i];

  756.         }

  757.     return best_i;

  758. }

  759. 

  760. static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)

  761. {

  762.     NUTContext *nut    = s->priv_data;

  763.     StreamContext *nus = &nut->stream[pkt->stream_index];

  764.     AVIOContext *bc    = s->pb, *dyn_bc;

  765.     FrameCode *fc;

  766.     int64_t coded_pts;

  767.     int best_length, frame_code, flags, needed_flags, i, header_idx,

  768.         best_header_idx;

  769.     int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);

  770.     int store_sp  = 0;

  771.     int ret;

  772. 

  773.     if (pkt->pts < 0) {

  774.         av_log(s, AV_LOG_ERROR,

  775.                "Negative pts not supported stream %d, pts %"PRId64"\n",

  776.                pkt->stream_index, pkt->pts);

  777.         return AVERROR_INVALIDDATA;

  778.     }

  779. 

  780.     if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc))

  781.         write_headers(s, bc);

  782. 

  783.     if (key_frame && !(nus->last_flags & FLAG_KEY))

  784.         store_sp = 1;

  785. 

  786.     if (pkt->size + 30 /*FIXME check*/ + avio_tell(bc) >=

  787.         nut->last_syncpoint_pos + nut->max_distance)

  788.         store_sp = 1;

  789. 

  790. //FIXME: Ensure store_sp is 1 in the first place.

  791. 

  792.     if (store_sp) {

  793.         Syncpoint *sp, dummy = { .pos = INT64_MAX };

  794. 

  795.         ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);

  796.         for (i = 0; i < s->nb_streams; i++) {

  797.             AVStream *st   = s->streams[i];

  798.             int64_t dts_tb = av_rescale_rnd(pkt->dts,

  799.                 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,

  800.                 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,

  801.                 AV_ROUND_DOWN);

  802.             int index = av_index_search_timestamp(st, dts_tb,

  803.                                                   AVSEEK_FLAG_BACKWARD);

  804.             if (index >= 0)

  805.                 dummy.pos = FFMIN(dummy.pos, st->index_entries[index].pos);

  806.         }

  807.         if (dummy.pos == INT64_MAX)

  808.             dummy.pos = 0;

  809.         sp = av_tree_find(nut->syncpoints, &dummy, (void *)ff_nut_sp_pos_cmp,

  810.                           NULL);

  811. 

  812.         nut->last_syncpoint_pos = avio_tell(bc);

  813.         ret                     = avio_open_dyn_buf(&dyn_bc);

  814.         if (ret < 0)

  815.             return ret;

  816.         put_tt(nut, nus->time_base, dyn_bc, pkt->dts);

  817.         ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos) >> 4 : 0);

  818.         put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);

  819. 

  820.         if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts)) < 0)

  821.             return ret;

  822.     }

  823.     assert(nus->last_pts != AV_NOPTS_VALUE);

  824. 

  825.     coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1);

  826.     if (ff_lsb2full(nus, coded_pts) != pkt->pts)

  827.         coded_pts = pkt->pts + (1 << nus->msb_pts_shift);

  828. 

  829.     best_header_idx = find_best_header_idx(nut, pkt);

  830. 

  831.     best_length = INT_MAX;

  832.     frame_code  = -1;

  833.     for (i = 0; i < 256; i++) {

  834.         int length    = 0;

  835.         FrameCode *fc = &nut->frame_code[i];

  836.         int flags     = fc->flags;

  837. 

  838.         if (flags & FLAG_INVALID)

  839.             continue;

  840.         needed_flags = get_needed_flags(nut, nus, fc, pkt);

  841. 

  842.         if (flags & FLAG_CODED) {

  843.             length++;

  844.             flags = needed_flags;

  845.         }

  846. 

  847.         if ((flags & needed_flags) != needed_flags)

  848.             continue;

  849. 

  850.         if ((flags ^ needed_flags) & FLAG_KEY)

  851.             continue;

  852. 

  853.         if (flags & FLAG_STREAM_ID)

  854.             length += ff_get_v_length(pkt->stream_index);

  855. 

  856.         if (pkt->size % fc->size_mul != fc->size_lsb)

  857.             continue;

  858.         if (flags & FLAG_SIZE_MSB)

  859.             length += ff_get_v_length(pkt->size / fc->size_mul);

  860. 

  861.         if (flags & FLAG_CHECKSUM)

  862.             length += 4;

  863. 

  864.         if (flags & FLAG_CODED_PTS)

  865.             length += ff_get_v_length(coded_pts);

  866. 

  867.         if ((flags & FLAG_CODED)

  868.             && nut->header_len[best_header_idx] >

  869.             nut->header_len[fc->header_idx] + 1) {

  870.             flags |= FLAG_HEADER_IDX;

  871.         }

  872. 

  873.         if (flags & FLAG_HEADER_IDX) {

  874.             length += 1 - nut->header_len[best_header_idx];

  875.         } else {

  876.             length -= nut->header_len[fc->header_idx];

  877.         }

  878. 

  879.         length *= 4;

  880.         length += !(flags & FLAG_CODED_PTS);

  881.         length += !(flags & FLAG_CHECKSUM);

  882. 

  883.         if (length < best_length) {

  884.             best_length = length;

  885.             frame_code  = i;

  886.         }

  887.     }

  888.     assert(frame_code != -1);

  889.     fc           = &nut->frame_code[frame_code];

  890.     flags        = fc->flags;

  891.     needed_flags = get_needed_flags(nut, nus, fc, pkt);

  892.     header_idx   = fc->header_idx;

  893. 

  894.     ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  895.     avio_w8(bc, frame_code);

  896.     if (flags & FLAG_CODED) {

  897.         ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED));

  898.         flags = needed_flags;

  899.     }

  900.     if (flags & FLAG_STREAM_ID)

  901.         ff_put_v(bc, pkt->stream_index);

  902.     if (flags & FLAG_CODED_PTS)

  903.         ff_put_v(bc, coded_pts);

  904.     if (flags & FLAG_SIZE_MSB)

  905.         ff_put_v(bc, pkt->size / fc->size_mul);

  906.     if (flags & FLAG_HEADER_IDX)

  907.         ff_put_v(bc, header_idx = best_header_idx);

  908. 

  909.     if (flags & FLAG_CHECKSUM)

  910.         avio_wl32(bc, ffio_get_checksum(bc));

  911.     else

  912.         ffio_get_checksum(bc);

  913. 

  914.     avio_write(bc, pkt->data + nut->header_len[header_idx],

  915.                pkt->size - nut->header_len[header_idx]);

  916.     nus->last_flags = flags;

  917.     nus->last_pts   = pkt->pts;

  918. 

  919.     //FIXME just store one per syncpoint

  920.     if (flags & FLAG_KEY)

  921.         av_add_index_entry(

  922.             s->streams[pkt->stream_index],

  923.             nut->last_syncpoint_pos,

  924.             pkt->pts,

  925.             0,

  926.             0,

  927.             AVINDEX_KEYFRAME);

  928. 

  929.     return 0;

  930. }

  931. 

  932. static int nut_write_trailer(AVFormatContext *s)

  933. {

  934.     NUTContext *nut = s->priv_data;

  935.     AVIOContext *bc = s->pb;

  936. 

  937.     while (nut->header_count < 3)

  938.         write_headers(s, bc);

  939. 

  940.     ff_nut_free_sp(nut);

  941.     av_freep(&nut->stream);

  942.     av_freep(&nut->chapter);

  943.     av_freep(&nut->time_base);

  944. 

  945.     return 0;

  946. }

  947. 

  948. AVOutputFormat ff_nut_muxer = {

  949.     .name           = "nut",

  950.     .long_name      = NULL_IF_CONFIG_SMALL("NUT"),

  951.     .mime_type      = "video/x-nut",

  952.     .extensions     = "nut",

  953.     .priv_data_size = sizeof(NUTContext),

  954.     .audio_codec    = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :

  955.                       CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,

  956.     .video_codec    = AV_CODEC_ID_MPEG4,

  957.     .write_header   = nut_write_header,

  958.     .write_packet   = nut_write_packet,

  959.     .write_trailer  = nut_write_trailer,

  960.     .flags          = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,

  961.     .codec_tag      = ff_nut_codec_tags,

  962. };