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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 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. #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 "libavutil/avassert.h"

  29. #include "libavutil/time.h"

  30. #include "libavutil/opt.h"

  31. #include "libavcodec/bytestream.h"

  32. #include "libavcodec/mpegaudiodata.h"

  33. #include "nut.h"

  34. #include "internal.h"

  35. #include "avio_internal.h"

  36. #include "riff.h"

  37. 

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

  39.                                 uint8_t out[64])

  40. {

  41.     int sample_rate = c->sample_rate;

  42. 

  43.     if (size > 4096)

  44.         return 0;

  45. 

  46.     AV_WB24(out, 1);

  47. 

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

  49.         if (key_frame) {

  50.             return 3;

  51.         } else {

  52.             out[3] = 0xB6;

  53.             return 4;

  54.         }

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

  56.                c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {

  57.         return 3;

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

  59.         return 3;

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

  61.                c->codec_id == AV_CODEC_ID_MP2) {

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

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

  64.         unsigned int header = 0xFFF00000;

  65. 

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

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

  68.         sample_rate <<= lsf + mpeg25;

  69.         if      (sample_rate < (32000 + 44100) / 2) sample_rate_index = 2;

  70.         else if (sample_rate < (44100 + 48000) / 2) sample_rate_index = 0;

  71.         else                                        sample_rate_index = 1;

  72. 

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

  74. 

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

  76.             frame_size =

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

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

  79.                 (bitrate_index & 1);

  80. 

  81.             if (frame_size == size)

  82.                 break;

  83.         }

  84. 

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

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

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

  88.         AV_WB32(out, header);

  89.         if (size <= 0)

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

  91.         if (bitrate_index == 30)

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

  93. 

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

  95.         header |= sample_rate_index << 10;

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

  97. 

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

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

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

  101.     }

  102.     return 0;

  103. }

  104. 

  105. static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, 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.         int frame_size = 0;

  175. 

  176.         if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  177.             frame_size = av_get_audio_frame_duration(codec, 0);

  178.             if (codec->codec_id == AV_CODEC_ID_VORBIS && !frame_size)

  179.                 frame_size = 64;

  180.         } else {

  181.             AVRational f = av_div_q(codec->time_base, *nut->stream[stream_id].time_base);

  182.             if (f.den == 1 && f.num>0)

  183.                 frame_size = f.num;

  184.         }

  185.         if (!frame_size)

  186.             frame_size = 1;

  187. 

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

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

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

  191.                 ft->flags     = FLAG_KEY * key_frame;

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

  193.                 ft->stream_id = stream_id;

  194.                 ft->size_mul  = 1;

  195.                 if (is_audio)

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

  197.                 start2++;

  198.             }

  199.         }

  200. 

  201.         key_frame = intra_only;

  202. #if 1

  203.         if (is_audio) {

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

  205.                               (8 * codec->sample_rate);

  206.             int pts;

  207.             for (pts = 0; pts < 2; pts++) {

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

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

  210.                     ft->flags      = FLAG_KEY * key_frame;

  211.                     ft->stream_id  = stream_id;

  212.                     ft->size_mul   = frame_bytes + 2;

  213.                     ft->size_lsb   = frame_bytes + pred;

  214.                     ft->pts_delta  = pts * frame_size;

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

  216.                     start2++;

  217.                 }

  218.             }

  219.         } else {

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

  221.             ft->flags     = FLAG_KEY | FLAG_SIZE_MSB;

  222.             ft->stream_id = stream_id;

  223.             ft->size_mul  = 1;

  224.             ft->pts_delta = frame_size;

  225.             start2++;

  226.         }

  227. #endif

  228. 

  229.         if (codec->has_b_frames) {

  230.             pred_count    = 5;

  231.             pred_table[0] = -2;

  232.             pred_table[1] = -1;

  233.             pred_table[2] = 1;

  234.             pred_table[3] = 3;

  235.             pred_table[4] = 4;

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

  237.             pred_count    = 3;

  238.             pred_table[0] = 2;

  239.             pred_table[1] = 9;

  240.             pred_table[2] = 16;

  241.         } else {

  242.             pred_count    = 1;

  243.             pred_table[0] = 1;

  244.         }

  245. 

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

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

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

  249. 

  250.             pred_table[pred] *= frame_size;

  251. 

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

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

  254.                 ft->flags     = FLAG_KEY * key_frame;

  255.                 ft->flags    |= FLAG_SIZE_MSB;

  256.                 ft->stream_id = stream_id;

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

  258.                 ft->size_mul  = end3 - start3;

  259.                 ft->size_lsb  = index - start3;

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

  261.                 if (is_audio)

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

  263.             }

  264.         }

  265.     }

  266.     memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'], sizeof(FrameCode) * (255 - 'N'));

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

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

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

  270. }

  271. 

  272. static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val)

  273. {

  274.     val *= nut->time_base_count;

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

  276.     ff_put_v(bc, val);

  277. }

  278. /**

  279.  * Store a string as vb.

  280.  */

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

  282. {

  283.     int len = strlen(string);

  284. 

  285.     ff_put_v(bc, len);

  286.     avio_write(bc, string, len);

  287. }

  288. 

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

  290. {

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

  292. }

  293. 

  294. #ifdef TRACE

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

  296.                                   const char *func, int line)

  297. {

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

  299. 

  300.     ff_put_v(bc, v);

  301. }

  302. 

  303. static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file, const char *func, int line)

  304. {

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

  306. 

  307.     put_s(bc, v);

  308. }

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

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

  311. #endif

  312. 

  313. //FIXME remove calculate_checksum

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

  315.                        int calculate_checksum, uint64_t startcode)

  316. {

  317.     uint8_t *dyn_buf = NULL;

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

  319.     int forw_ptr     = dyn_size + 4 * calculate_checksum;

  320. 

  321.     if (forw_ptr > 4096)

  322.         ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  323.     avio_wb64(bc, startcode);

  324.     ff_put_v(bc, forw_ptr);

  325.     if (forw_ptr > 4096)

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

  327. 

  328.     if (calculate_checksum)

  329.         ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  330.     avio_write(bc, dyn_buf, dyn_size);

  331.     if (calculate_checksum)

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

  333. 

  334.     av_free(dyn_buf);

  335. }

  336. 

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

  338. {

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

  340.         tmp_head_idx;

  341.     int64_t tmp_match;

  342. 

  343.     ff_put_v(bc, nut->version);

  344.     if (nut->version > 3)

  345.         ff_put_v(bc, nut->minor_version = 1);

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

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

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

  349. 

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

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

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

  353.     }

  354. 

  355.     tmp_pts      = 0;

  356.     tmp_mul      = 1;

  357.     tmp_stream   = 0;

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

  359.     tmp_head_idx = 0;

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

  361.         tmp_fields = 0;

  362.         tmp_size   = 0;

  363. //        tmp_res=0;

  364.         if (tmp_pts      != nut->frame_code[i].pts_delta ) tmp_fields = 1;

  365.         if (tmp_mul      != nut->frame_code[i].size_mul  ) tmp_fields = 2;

  366.         if (tmp_stream   != nut->frame_code[i].stream_id ) tmp_fields = 3;

  367.         if (tmp_size     != nut->frame_code[i].size_lsb  ) tmp_fields = 4;

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

  369.         if (tmp_head_idx != nut->frame_code[i].header_idx) tmp_fields = 8;

  370. 

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

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

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

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

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

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

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

  378. 

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

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

  381.                 j--;

  382.                 continue;

  383.             }

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

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

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

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

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

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

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

  391.                 break;

  392.         }

  393.         if (j != tmp_mul - tmp_size)

  394.             tmp_fields = 6;

  395. 

  396.         ff_put_v(bc, tmp_flags);

  397.         ff_put_v(bc, tmp_fields);

  398.         if (tmp_fields > 0) put_s(bc, tmp_pts);

  399.         if (tmp_fields > 1) ff_put_v(bc, tmp_mul);

  400.         if (tmp_fields > 2) ff_put_v(bc, tmp_stream);

  401.         if (tmp_fields > 3) ff_put_v(bc, tmp_size);

  402.         if (tmp_fields > 4) ff_put_v(bc, 0 /*tmp_res*/);

  403.         if (tmp_fields > 5) ff_put_v(bc, j);

  404.         if (tmp_fields > 6) ff_put_v(bc, tmp_match);

  405.         if (tmp_fields > 7) ff_put_v(bc, tmp_head_idx);

  406.     }

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

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

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

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

  411.     }

  412.     // flags had been effectively introduced in version 4

  413.     if (nut->version > 3)

  414.         ff_put_v(bc, nut->flags);

  415. }

  416. 

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

  418.                               AVStream *st, int i)

  419. {

  420.     NUTContext *nut       = avctx->priv_data;

  421.     AVCodecContext *codec = st->codec;

  422. 

  423.     ff_put_v(bc, i);

  424.     switch (codec->codec_type) {

  425.     case AVMEDIA_TYPE_VIDEO:    ff_put_v(bc, 0); break;

  426.     case AVMEDIA_TYPE_AUDIO:    ff_put_v(bc, 1); break;

  427.     case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;

  428.     default:                    ff_put_v(bc, 3); break;

  429.     }

  430.     ff_put_v(bc, 4);

  431.     if (codec->codec_tag) {

  432.         avio_wl32(bc, codec->codec_tag);

  433.     } else {

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

  435.         return AVERROR(EINVAL);

  436.     }

  437. 

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

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

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

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

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

  443. 

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

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

  446. 

  447.     switch (codec->codec_type) {

  448.     case AVMEDIA_TYPE_AUDIO:

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

  450.         ff_put_v(bc, 1);

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

  452.         break;

  453.     case AVMEDIA_TYPE_VIDEO:

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

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

  456. 

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

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

  459.             ff_put_v(bc, 0);

  460.             ff_put_v(bc, 0);

  461.         } else {

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

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

  464.         }

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

  466.         break;

  467.     default:

  468.         break;

  469.     }

  470.     return 0;

  471. }

  472. 

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

  474. {

  475.     put_str(bc, type);

  476.     put_s(bc, -1);

  477.     put_str(bc, value);

  478.     return 1;

  479. }

  480. 

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

  482. {

  483.     AVFormatContext *s   = nut->avf;

  484.     AVDictionaryEntry *t = NULL;

  485.     AVIOContext *dyn_bc;

  486.     uint8_t *dyn_buf = NULL;

  487.     int count        = 0, dyn_size;

  488.     int ret          = avio_open_dyn_buf(&dyn_bc);

  489.     if (ret < 0)

  490.         return ret;

  491. 

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

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

  494. 

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

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

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

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

  499. 

  500.     ff_put_v(bc, count);

  501. 

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

  503.     avio_write(bc, dyn_buf, dyn_size);

  504.     av_free(dyn_buf);

  505.     return 0;

  506. }

  507. 

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

  509.     AVFormatContext *s= nut->avf;

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

  511.     AVDictionaryEntry *t = NULL;

  512.     AVIOContext *dyn_bc;

  513.     uint8_t *dyn_buf=NULL;

  514.     int count=0, dyn_size, i;

  515.     int ret = avio_open_dyn_buf(&dyn_bc);

  516.     if (ret < 0)

  517.         return ret;

  518. 

  519.     while ((t = av_dict_get(st->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))

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

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

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

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

  524.     }

  525.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  526.         uint8_t buf[256];

  527.         snprintf(buf, sizeof(buf), "%d/%d", st->codec->time_base.den, st->codec->time_base.num);

  528.         count += add_info(dyn_bc, "r_frame_rate", buf);

  529.     }

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

  531. 

  532.     if (count) {

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

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

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

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

  537. 

  538.         ff_put_v(bc, count);

  539. 

  540.         avio_write(bc, dyn_buf, dyn_size);

  541.     }

  542. 

  543.     av_free(dyn_buf);

  544.     return count;

  545. }

  546. 

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

  548. {

  549.     AVIOContext *dyn_bc;

  550.     uint8_t *dyn_buf     = NULL;

  551.     AVDictionaryEntry *t = NULL;

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

  553.     int ret, dyn_size, count = 0;

  554. 

  555.     ret = avio_open_dyn_buf(&dyn_bc);

  556.     if (ret < 0)

  557.         return ret;

  558. 

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

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

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

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

  563. 

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

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

  566. 

  567.     ff_put_v(bc, count);

  568. 

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

  570.     avio_write(bc, dyn_buf, dyn_size);

  571.     av_freep(&dyn_buf);

  572.     return 0;

  573. }

  574. 

  575. static int write_index(NUTContext *nut, AVIOContext *bc) {

  576.     int i;

  577.     Syncpoint dummy= { .pos= 0 };

  578.     Syncpoint *next_node[2] = { NULL };

  579.     int64_t startpos = avio_tell(bc);

  580.     int64_t payload_size;

  581. 

  582.     put_tt(nut, nut->max_pts_tb, bc, nut->max_pts);

  583. 

  584.     ff_put_v(bc, nut->sp_count);

  585. 

  586.     for (i=0; i<nut->sp_count; i++) {

  587.         av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, (void**)next_node);

  588.         ff_put_v(bc, (next_node[1]->pos >> 4) - (dummy.pos>>4));

  589.         dummy.pos = next_node[1]->pos;

  590.     }

  591. 

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

  593.         StreamContext *nus= &nut->stream[i];

  594.         int64_t last_pts= -1;

  595.         int j, k;

  596.         for (j=0; j<nut->sp_count; j++) {

  597.             int flag;

  598.             int n = 0;

  599. 

  600.             if (j && nus->keyframe_pts[j] == nus->keyframe_pts[j-1]) {

  601.                 av_log(nut->avf, AV_LOG_WARNING, "Multiple keyframes with same PTS\n");

  602.                 nus->keyframe_pts[j] = AV_NOPTS_VALUE;

  603.             }

  604. 

  605.             flag = (nus->keyframe_pts[j] != AV_NOPTS_VALUE) ^ (j+1 == nut->sp_count);

  606.             for (; j<nut->sp_count && (nus->keyframe_pts[j] != AV_NOPTS_VALUE) == flag; j++)

  607.                 n++;

  608. 

  609.             ff_put_v(bc, 1 + 2*flag + 4*n);

  610.             for (k= j - n; k<=j && k<nut->sp_count; k++) {

  611.                 if (nus->keyframe_pts[k] == AV_NOPTS_VALUE)

  612.                     continue;

  613.                 av_assert0(nus->keyframe_pts[k] > last_pts);

  614.                 ff_put_v(bc, nus->keyframe_pts[k] - last_pts);

  615.                 last_pts = nus->keyframe_pts[k];

  616.             }

  617.         }

  618.     }

  619. 

  620.     payload_size = avio_tell(bc) - startpos + 8 + 4;

  621. 

  622.     avio_wb64(bc, 8 + payload_size + av_log2(payload_size) / 7 + 1 + 4*(payload_size > 4096));

  623. 

  624.     return 0;

  625. }

  626. 

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

  628. {

  629.     NUTContext *nut = avctx->priv_data;

  630.     AVIOContext *dyn_bc;

  631.     int i, ret;

  632. 

  633.     ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);

  634. 

  635.     ret = avio_open_dyn_buf(&dyn_bc);

  636.     if (ret < 0)

  637.         return ret;

  638.     write_mainheader(nut, dyn_bc);

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

  640. 

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

  642.         ret = avio_open_dyn_buf(&dyn_bc);

  643.         if (ret < 0)

  644.             return ret;

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

  646.         if (ret < 0)

  647.             return ret;

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

  649.     }

  650. 

  651.     ret = avio_open_dyn_buf(&dyn_bc);

  652.     if (ret < 0)

  653.         return ret;

  654.     write_globalinfo(nut, dyn_bc);

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

  656. 

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

  658.         ret = avio_open_dyn_buf(&dyn_bc);

  659.         if (ret < 0)

  660.             return ret;

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

  662.         if (ret < 0)

  663.             return ret;

  664.         if (ret > 0)

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

  666.         else {

  667.             uint8_t *buf;

  668.             avio_close_dyn_buf(dyn_bc, &buf);

  669.             av_free(buf);

  670.         }

  671.     }

  672. 

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

  674.         ret = avio_open_dyn_buf(&dyn_bc);

  675.         if (ret < 0)

  676.             return ret;

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

  678.         if (ret < 0) {

  679.             uint8_t *buf;

  680.             avio_close_dyn_buf(dyn_bc, &buf);

  681.             av_freep(&buf);

  682.             return ret;

  683.         }

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

  685.     }

  686. 

  687.     nut->last_syncpoint_pos = INT_MIN;

  688.     nut->header_count++;

  689.     return 0;

  690. }

  691. 

  692. static int nut_write_header(AVFormatContext *s)

  693. {

  694.     NUTContext *nut = s->priv_data;

  695.     AVIOContext *bc = s->pb;

  696.     int i, j, ret;

  697. 

  698.     nut->avf = s;

  699. 

  700.     nut->version = FFMAX(NUT_STABLE_VERSION, 3 + !!nut->flags);

  701.     if (nut->version > 3 && s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {

  702.         av_log(s, AV_LOG_ERROR,

  703.                "The additional syncpoint modes require version %d, "

  704.                "that is currently not finalized, "

  705.                "please set -f_strict experimental in order to enable it.\n",

  706.                nut->version);

  707.         return AVERROR_EXPERIMENTAL;

  708.     }

  709. 

  710.     nut->stream   = av_calloc(s->nb_streams,  sizeof(*nut->stream ));

  711.     nut->chapter  = av_calloc(s->nb_chapters, sizeof(*nut->chapter));

  712.     nut->time_base= av_calloc(s->nb_streams +

  713.                               s->nb_chapters, sizeof(*nut->time_base));

  714.     if (!nut->stream || !nut->chapter || !nut->time_base) {

  715.         av_freep(&nut->stream);

  716.         av_freep(&nut->chapter);

  717.         av_freep(&nut->time_base);

  718.         return AVERROR(ENOMEM);

  719.     }

  720. 

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

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

  723.         int ssize;

  724.         AVRational time_base;

  725.         ff_parse_specific_params(st, &time_base.den, &ssize, &time_base.num);

  726. 

  727.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->sample_rate) {

  728.             time_base = (AVRational) {1, st->codec->sample_rate};

  729.         } else {

  730.             time_base = ff_choose_timebase(s, st, 48000);

  731.         }

  732. 

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

  734. 

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

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

  737.                 break;

  738.             }

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

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

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

  742.             nut->time_base_count++;

  743. 

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

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

  746.         else

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

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

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

  750.     }

  751. 

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

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

  754. 

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

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

  757.                 break;

  758. 

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

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

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

  762.             nut->time_base_count++;

  763.     }

  764. 

  765.     nut->max_distance = MAX_DISTANCE;

  766.     build_elision_headers(s);

  767.     build_frame_code(s);

  768.     av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);

  769. 

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

  771.     avio_w8(bc, 0);

  772. 

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

  774.         return ret;

  775. 

  776.     if (s->avoid_negative_ts < 0)

  777.         s->avoid_negative_ts = 1;

  778. 

  779.     avio_flush(bc);

  780. 

  781.     return 0;

  782. }

  783. 

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

  785.                             AVPacket *pkt)

  786. {

  787.     int flags = 0;

  788. 

  789.     if (pkt->flags & AV_PKT_FLAG_KEY)

  790.         flags |= FLAG_KEY;

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

  792.         flags |= FLAG_STREAM_ID;

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

  794.         flags |= FLAG_SIZE_MSB;

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

  796.         flags |= FLAG_CODED_PTS;

  797.     if (pkt->side_data_elems && nut->version > 3)

  798.         flags |= FLAG_SM_DATA;

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

  800.         flags |= FLAG_CHECKSUM;

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

  802.         flags |= FLAG_CHECKSUM;

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

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

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

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

  807.         flags |= FLAG_HEADER_IDX;

  808. 

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

  810. }

  811. 

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

  813. {

  814.     int i;

  815.     int best_i   = 0;

  816.     int best_len = 0;

  817. 

  818.     if (pkt->size > 4096)

  819.         return 0;

  820. 

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

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

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

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

  825.             best_i   = i;

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

  827.         }

  828.     return best_i;

  829. }

  830. 

  831. static int write_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta)

  832. {

  833.     int ret, i, dyn_size;

  834.     unsigned flags;

  835.     AVIOContext *dyn_bc;

  836.     int sm_data_count = 0;

  837.     uint8_t tmp[256];

  838.     uint8_t *dyn_buf;

  839. 

  840.     ret = avio_open_dyn_buf(&dyn_bc);

  841.     if (ret < 0)

  842.         return ret;

  843. 

  844.     for (i = 0; i<pkt->side_data_elems; i++) {

  845.         const uint8_t *data = pkt->side_data[i].data;

  846.         int size = pkt->side_data[i].size;

  847.         const uint8_t *data_end = data + size;

  848. 

  849.         if (is_meta) {

  850.             if (   pkt->side_data[i].type == AV_PKT_DATA_METADATA_UPDATE

  851.                 || pkt->side_data[i].type == AV_PKT_DATA_STRINGS_METADATA) {

  852.                 if (!size || data[size-1]) {

  853.                     ret = AVERROR(EINVAL);

  854.                     goto fail;

  855.                 }

  856.                 while (data < data_end) {

  857.                     const uint8_t *key = data;

  858.                     const uint8_t *val = data + strlen(key) + 1;

  859. 

  860.                     if(val >= data_end) {

  861.                         ret = AVERROR(EINVAL);

  862.                         goto fail;

  863.                     }

  864.                     put_str(dyn_bc, key);

  865.                     put_s(dyn_bc, -1);

  866.                     put_str(dyn_bc, val);

  867.                     data = val + strlen(val) + 1;

  868.                     sm_data_count++;

  869.                 }

  870.             }

  871.         } else {

  872.             switch (pkt->side_data[i].type) {

  873.             case AV_PKT_DATA_PALETTE:

  874.             case AV_PKT_DATA_NEW_EXTRADATA:

  875.             case AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL:

  876.             default:

  877.                 if (pkt->side_data[i].type == AV_PKT_DATA_PALETTE) {

  878.                     put_str(dyn_bc, "Palette");

  879.                 } else if(pkt->side_data[i].type == AV_PKT_DATA_NEW_EXTRADATA) {

  880.                     put_str(dyn_bc, "Extradata");

  881.                 } else if(pkt->side_data[i].type == AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL) {

  882.                     snprintf(tmp, sizeof(tmp), "CodecSpecificSide%"PRId64"", AV_RB64(data));

  883.                     put_str(dyn_bc, tmp);

  884.                 } else {

  885.                     snprintf(tmp, sizeof(tmp), "UserData%s-SD-%d",

  886.                             (s->flags & AVFMT_FLAG_BITEXACT) ? "Lavf" : LIBAVFORMAT_IDENT,

  887.                             pkt->side_data[i].type);

  888.                     put_str(dyn_bc, tmp);

  889.                 }

  890.                 put_s(dyn_bc, -2);

  891.                 put_str(dyn_bc, "bin");

  892.                 ff_put_v(dyn_bc, pkt->side_data[i].size);

  893.                 avio_write(dyn_bc, data, pkt->side_data[i].size);

  894.                 sm_data_count++;

  895.                 break;

  896.             case AV_PKT_DATA_PARAM_CHANGE:

  897.                 flags = bytestream_get_le32(&data);

  898.                 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {

  899.                     put_str(dyn_bc, "Channels");

  900.                     put_s(dyn_bc, bytestream_get_le32(&data));

  901.                     sm_data_count++;

  902.                 }

  903.                 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {

  904.                     put_str(dyn_bc, "ChannelLayout");

  905.                     put_s(dyn_bc, -2);

  906.                     put_str(dyn_bc, "u64");

  907.                     ff_put_v(bc, 8);

  908.                     avio_write(dyn_bc, data, 8); data+=8;

  909.                     sm_data_count++;

  910.                 }

  911.                 if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {

  912.                     put_str(dyn_bc, "SampleRate");

  913.                     put_s(dyn_bc, bytestream_get_le32(&data));

  914.                     sm_data_count++;

  915.                 }

  916.                 if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {

  917.                     put_str(dyn_bc, "Width");

  918.                     put_s(dyn_bc, bytestream_get_le32(&data));

  919.                     put_str(dyn_bc, "Height");

  920.                     put_s(dyn_bc, bytestream_get_le32(&data));

  921.                     sm_data_count+=2;

  922.                 }

  923.                 break;

  924.             case AV_PKT_DATA_SKIP_SAMPLES:

  925.                 if (AV_RL32(data)) {

  926.                     put_str(dyn_bc, "SkipStart");

  927.                     put_s(dyn_bc, (unsigned)AV_RL32(data));

  928.                     sm_data_count++;

  929.                 }

  930.                 if (AV_RL32(data+4)) {

  931.                     put_str(dyn_bc, "SkipEnd");

  932.                     put_s(dyn_bc, (unsigned)AV_RL32(data+4));

  933.                     sm_data_count++;

  934.                 }

  935.                 break;

  936.             case AV_PKT_DATA_METADATA_UPDATE:

  937.             case AV_PKT_DATA_STRINGS_METADATA:

  938.                 // belongs into meta, not side data

  939.                 break;

  940.             }

  941.         }

  942.     }

  943. 

  944. fail:

  945.     ff_put_v(bc, sm_data_count);

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

  947.     avio_write(bc, dyn_buf, dyn_size);

  948.     av_freep(&dyn_buf);

  949. 

  950.     return ret;

  951. }

  952. 

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

  954. {

  955.     NUTContext *nut    = s->priv_data;

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

  957.     AVIOContext *bc    = s->pb, *dyn_bc, *sm_bc = NULL;

  958.     FrameCode *fc;

  959.     int64_t coded_pts;

  960.     int best_length, frame_code, flags, needed_flags, i, header_idx;

  961.     int best_header_idx;

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

  963.     int store_sp  = 0;

  964.     int ret = 0;

  965.     int sm_size = 0;

  966.     int data_size = pkt->size;

  967.     uint8_t *sm_buf = NULL;

  968. 

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

  970.         av_log(s, AV_LOG_ERROR,

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

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

  973.         if (pkt->pts == AV_NOPTS_VALUE)

  974.             av_log(s, AV_LOG_ERROR, "Try to enable the genpts flag\n");

  975.         return AVERROR(EINVAL);

  976.     }

  977. 

  978.     if (pkt->side_data_elems && nut->version > 3) {

  979.         ret = avio_open_dyn_buf(&sm_bc);

  980.         if (ret < 0)

  981.             return ret;

  982.         ret = write_sm_data(s, sm_bc, pkt, 0);

  983.         if (ret >= 0)

  984.             ret = write_sm_data(s, sm_bc, pkt, 1);

  985.         sm_size = avio_close_dyn_buf(sm_bc, &sm_buf);

  986.         if (ret < 0)

  987.             goto fail;

  988.         data_size += sm_size;

  989.     }

  990. 

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

  992.         write_headers(s, bc);

  993. 

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

  995.         store_sp = 1;

  996. 

  997.     if (data_size + 30 /*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)

  998.         store_sp = 1;

  999. 

  1000. //FIXME: Ensure store_sp is 1 in the first place.

  1001. 

  1002.     if (store_sp &&

  1003.         (!(nut->flags & NUT_PIPE) || nut->last_syncpoint_pos == INT_MIN)) {

  1004.         int64_t sp_pos = INT64_MAX;

  1005. 

  1006.         ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);

  1007.         for (i = 0; i < s->nb_streams; i++) {

  1008.             AVStream *st   = s->streams[i];

  1009.             int64_t dts_tb = av_rescale_rnd(pkt->dts,

  1010.                 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,

  1011.                 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,

  1012.                 AV_ROUND_DOWN);

  1013.             int index = av_index_search_timestamp(st, dts_tb,

  1014.                                                   AVSEEK_FLAG_BACKWARD);

  1015.             if (index >= 0) {

  1016.                 sp_pos = FFMIN(sp_pos, st->index_entries[index].pos);

  1017.                 if (!nut->write_index && 2*index > st->nb_index_entries) {

  1018.                     memmove(st->index_entries,

  1019.                             st->index_entries + index,

  1020.                             sizeof(*st->index_entries) * (st->nb_index_entries - index));

  1021.                     st->nb_index_entries -=  index;

  1022.                 }

  1023.             }

  1024.         }

  1025. 

  1026.         nut->last_syncpoint_pos = avio_tell(bc);

  1027.         ret                     = avio_open_dyn_buf(&dyn_bc);

  1028.         if (ret < 0)

  1029.             goto fail;

  1030.         put_tt(nut, nus->time_base, dyn_bc, pkt->dts);

  1031.         ff_put_v(dyn_bc, sp_pos != INT64_MAX ? (nut->last_syncpoint_pos - sp_pos) >> 4 : 0);

  1032. 

  1033.         if (nut->flags & NUT_BROADCAST) {

  1034.             put_tt(nut, nus->time_base, dyn_bc,

  1035.                    av_rescale_q(av_gettime(), AV_TIME_BASE_Q, *nus->time_base));

  1036.         }

  1037.         put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);

  1038. 

  1039.         if (nut->write_index) {

  1040.         if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts)) < 0)

  1041.             goto fail;

  1042. 

  1043.         if ((1ll<<60) % nut->sp_count == 0)

  1044.             for (i=0; i<s->nb_streams; i++) {

  1045.                 int j;

  1046.                 StreamContext *nus = &nut->stream[i];

  1047.                 av_reallocp_array(&nus->keyframe_pts, 2*nut->sp_count, sizeof(*nus->keyframe_pts));

  1048.                 if (!nus->keyframe_pts) {

  1049.                     ret = AVERROR(ENOMEM);

  1050.                     goto fail;

  1051.                 }

  1052.                 for (j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)

  1053.                     nus->keyframe_pts[j] = AV_NOPTS_VALUE;

  1054.         }

  1055.         }

  1056.     }

  1057.     av_assert0(nus->last_pts != AV_NOPTS_VALUE);

  1058. 

  1059.     coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1);

  1060.     if (ff_lsb2full(nus, coded_pts) != pkt->pts)

  1061.         coded_pts = pkt->pts + (1 << nus->msb_pts_shift);

  1062. 

  1063.     best_header_idx = find_best_header_idx(nut, pkt);

  1064. 

  1065.     best_length = INT_MAX;

  1066.     frame_code  = -1;

  1067.     for (i = 0; i < 256; i++) {

  1068.         int length    = 0;

  1069.         FrameCode *fc = &nut->frame_code[i];

  1070.         int flags     = fc->flags;

  1071. 

  1072.         if (flags & FLAG_INVALID)

  1073.             continue;

  1074.         needed_flags = get_needed_flags(nut, nus, fc, pkt);

  1075. 

  1076.         if (flags & FLAG_CODED) {

  1077.             length++;

  1078.             flags = needed_flags;

  1079.         }

  1080. 

  1081.         if ((flags & needed_flags) != needed_flags)

  1082.             continue;

  1083. 

  1084.         if ((flags ^ needed_flags) & FLAG_KEY)

  1085.             continue;

  1086. 

  1087.         if (flags & FLAG_STREAM_ID)

  1088.             length += ff_get_v_length(pkt->stream_index);

  1089. 

  1090.         if (data_size % fc->size_mul != fc->size_lsb)

  1091.             continue;

  1092.         if (flags & FLAG_SIZE_MSB)

  1093.             length += ff_get_v_length(data_size / fc->size_mul);

  1094. 

  1095.         if (flags & FLAG_CHECKSUM)

  1096.             length += 4;

  1097. 

  1098.         if (flags & FLAG_CODED_PTS)

  1099.             length += ff_get_v_length(coded_pts);

  1100. 

  1101.         if (   (flags & FLAG_CODED)

  1102.             && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx] + 1) {

  1103.             flags |= FLAG_HEADER_IDX;

  1104.         }

  1105. 

  1106.         if (flags & FLAG_HEADER_IDX) {

  1107.             length += 1 - nut->header_len[best_header_idx];

  1108.         } else {

  1109.             length -= nut->header_len[fc->header_idx];

  1110.         }

  1111. 

  1112.         length *= 4;

  1113.         length += !(flags & FLAG_CODED_PTS);

  1114.         length += !(flags & FLAG_CHECKSUM);

  1115. 

  1116.         if (length < best_length) {

  1117.             best_length = length;

  1118.             frame_code  = i;

  1119.         }

  1120.     }

  1121.     av_assert0(frame_code != -1);

  1122.     fc           = &nut->frame_code[frame_code];

  1123.     flags        = fc->flags;

  1124.     needed_flags = get_needed_flags(nut, nus, fc, pkt);

  1125.     header_idx   = fc->header_idx;

  1126. 

  1127.     ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  1128.     avio_w8(bc, frame_code);

  1129.     if (flags & FLAG_CODED) {

  1130.         ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED));

  1131.         flags = needed_flags;

  1132.     }

  1133.     if (flags & FLAG_STREAM_ID)  ff_put_v(bc, pkt->stream_index);

  1134.     if (flags & FLAG_CODED_PTS)  ff_put_v(bc, coded_pts);

  1135.     if (flags & FLAG_SIZE_MSB )  ff_put_v(bc, data_size / fc->size_mul);

  1136.     if (flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx = best_header_idx);

  1137. 

  1138.     if (flags & FLAG_CHECKSUM)   avio_wl32(bc, ffio_get_checksum(bc));

  1139.     else                         ffio_get_checksum(bc);

  1140. 

  1141.     if (flags & FLAG_SM_DATA) {

  1142.         avio_write(bc, sm_buf, sm_size);

  1143.     }

  1144.     avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);

  1145. 

  1146.     nus->last_flags = flags;

  1147.     nus->last_pts   = pkt->pts;

  1148. 

  1149.     //FIXME just store one per syncpoint

  1150.     if (flags & FLAG_KEY && !(nut->flags & NUT_PIPE)) {

  1151.         av_add_index_entry(

  1152.             s->streams[pkt->stream_index],

  1153.             nut->last_syncpoint_pos,

  1154.             pkt->pts,

  1155.             0,

  1156.             0,

  1157.             AVINDEX_KEYFRAME);

  1158.         if (nus->keyframe_pts && nus->keyframe_pts[nut->sp_count] == AV_NOPTS_VALUE)

  1159.             nus->keyframe_pts[nut->sp_count] = pkt->pts;

  1160.     }

  1161. 

  1162.     if (!nut->max_pts_tb || av_compare_ts(nut->max_pts, *nut->max_pts_tb, pkt->pts, *nus->time_base) < 0) {

  1163.         nut->max_pts = pkt->pts;

  1164.         nut->max_pts_tb = nus->time_base;

  1165.     }

  1166. 

  1167. fail:

  1168.     av_freep(&sm_buf);

  1169. 

  1170.     return ret;

  1171. }

  1172. 

  1173. static int nut_write_trailer(AVFormatContext *s)

  1174. {

  1175.     NUTContext *nut = s->priv_data;

  1176.     AVIOContext *bc = s->pb, *dyn_bc;

  1177.     int i, ret;

  1178. 

  1179.     while (nut->header_count < 3)

  1180.         write_headers(s, bc);

  1181. 

  1182.     ret = avio_open_dyn_buf(&dyn_bc);

  1183.     if (ret >= 0 && nut->sp_count) {

  1184.         av_assert1(nut->write_index);

  1185.         write_index(nut, dyn_bc);

  1186.         put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);

  1187.     }

  1188. 

  1189.     ff_nut_free_sp(nut);

  1190.     for (i=0; i<s->nb_streams; i++)

  1191.         av_freep(&nut->stream[i].keyframe_pts);

  1192. 

  1193.     av_freep(&nut->stream);

  1194.     av_freep(&nut->chapter);

  1195.     av_freep(&nut->time_base);

  1196. 

  1197.     return 0;

  1198. }

  1199. 

  1200. #define OFFSET(x) offsetof(NUTContext, x)

  1201. #define E AV_OPT_FLAG_ENCODING_PARAM

  1202. static const AVOption options[] = {

  1203.     { "syncpoints",  "NUT syncpoint behaviour",                         OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0},             INT_MIN, INT_MAX, E, "syncpoints" },

  1204.     { "default",     "",                                                0,             AV_OPT_TYPE_CONST, {.i64 = 0},             INT_MIN, INT_MAX, E, "syncpoints" },

  1205.     { "none",        "Disable syncpoints, low overhead and unseekable", 0,             AV_OPT_TYPE_CONST, {.i64 = NUT_PIPE},      INT_MIN, INT_MAX, E, "syncpoints" },

  1206.     { "timestamped", "Extend syncpoints with a wallclock timestamp",    0,             AV_OPT_TYPE_CONST, {.i64 = NUT_BROADCAST}, INT_MIN, INT_MAX, E, "syncpoints" },

  1207.     { "write_index", "Write index",                               OFFSET(write_index), AV_OPT_TYPE_INT,   {.i64 = 1},                   0,       1, E, },

  1208.     { NULL },

  1209. };

  1210. 

  1211. static const AVClass class = {

  1212.     .class_name = "nutenc",

  1213.     .item_name  = av_default_item_name,

  1214.     .option     = options,

  1215.     .version    = LIBAVUTIL_VERSION_INT,

  1216. };

  1217. 

  1218. AVOutputFormat ff_nut_muxer = {

  1219.     .name           = "nut",

  1220.     .long_name      = NULL_IF_CONFIG_SMALL("NUT"),

  1221.     .mime_type      = "video/x-nut",

  1222.     .extensions     = "nut",

  1223.     .priv_data_size = sizeof(NUTContext),

  1224.     .audio_codec    = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :

  1225.                       CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,

  1226.     .video_codec    = AV_CODEC_ID_MPEG4,

  1227.     .write_header   = nut_write_header,

  1228.     .write_packet   = nut_write_packet,

  1229.     .write_trailer  = nut_write_trailer,

  1230.     .flags          = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,

  1231.     .codec_tag      = ff_nut_codec_tags,

  1232.     .priv_class     = &class,

  1233. };