falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36155 Commits
32 Branches
1.0GB
Tree: 89b51b570d
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '89b51b570d'
${ noResults }
FFmpeg/libavformat/nutenc.c

960 lines
30KB
Raw Blame History 

  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 "libavutil/intreadwrite.h"

  23. #include "libavutil/mathematics.h"

  24. #include "libavutil/tree.h"

  25. #include "libavutil/dict.h"

  26. #include "libavcodec/mpegaudiodata.h"

  27. #include "nut.h"

  28. #include "internal.h"

  29. #include "avio_internal.h"

  30. #include "riff.h"

  31. 

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

  33.                                 uint8_t out[64])

  34. {

  35.     int sample_rate = c->sample_rate;

  36. 

  37.     if (size > 4096)

  38.         return 0;

  39. 

  40.     AV_WB24(out, 1);

  41. 

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

  43.         if (key_frame) {

  44.             return 3;

  45.         } else {

  46.             out[3] = 0xB6;

  47.             return 4;

  48.         }

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

  50.                c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {

  51.         return 3;

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

  53.         return 3;

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

  55.                c->codec_id == AV_CODEC_ID_MP2) {

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

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

  58.         unsigned int header = 0xFFF00000;

  59. 

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

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

  62.         sample_rate <<= lsf + mpeg25;

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

  64.             sample_rate_index = 2;

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

  66.             sample_rate_index = 0;

  67.         else

  68.             sample_rate_index = 1;

  69. 

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

  71. 

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

  73.             frame_size =

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

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

  76.                 (bitrate_index & 1);

  77. 

  78.             if (frame_size == size)

  79.                 break;

  80.         }

  81. 

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

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

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

  85.         AV_WB32(out, header);

  86.         if (size <= 0)

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

  88.         if (bitrate_index == 30)

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

  90. 

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

  92.         header |= sample_rate_index << 10;

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

  94. 

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

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

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

  98.     }

  99.     return 0;

  100. }

  101. 

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

  103.                            int frame_type)

  104. {

  105.     NUTContext *nut = s->priv_data;

  106.     uint8_t out[64];

  107.     int i;

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

  109. 

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

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

  112.             return i;

  113.         }

  114.     }

  115. 

  116.     return 0;

  117. }

  118. 

  119. static void build_elision_headers(AVFormatContext *s)

  120. {

  121.     NUTContext *nut = s->priv_data;

  122.     int i;

  123.     //FIXME this is lame

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

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

  126.         { 3, 0x00, 0x00, 0x01 },

  127.         { 4, 0x00, 0x00, 0x01, 0xB6},

  128.         { 2, 0xFF, 0xFA }, //mp3+crc

  129.         { 2, 0xFF, 0xFB }, //mp3

  130.         { 2, 0xFF, 0xFC }, //mp2+crc

  131.         { 2, 0xFF, 0xFD }, //mp2

  132.     };

  133. 

  134.     nut->header_count = 7;

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

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

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

  138.     }

  139. }

  140. 

  141. static void build_frame_code(AVFormatContext *s)

  142. {

  143.     NUTContext *nut = s->priv_data;

  144.     int key_frame, index, pred, stream_id;

  145.     int start = 1;

  146.     int end   = 254;

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

  148.     int pred_table[10];

  149.     FrameCode *ft;

  150. 

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

  152.     ft->flags     = FLAG_CODED;

  153.     ft->size_mul  = 1;

  154.     ft->pts_delta = 1;

  155.     start++;

  156. 

  157.     if (keyframe_0_esc) {

  158.         /* keyframe = 0 escape */

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

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

  161.         ft->size_mul = 1;

  162.         start++;

  163.     }

  164. 

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

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

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

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

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

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

  171.         int pred_count;

  172. 

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

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

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

  176.                 ft->flags     = FLAG_KEY * key_frame;

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

  178.                 ft->stream_id = stream_id;

  179.                 ft->size_mul  = 1;

  180.                 if (is_audio)

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

  182.                 start2++;

  183.             }

  184.         }

  185. 

  186.         key_frame = intra_only;

  187.         if (is_audio) {

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

  189.                               (8 * codec->sample_rate);

  190.             int pts;

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

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

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

  194.                     ft->flags      = FLAG_KEY * key_frame;

  195.                     ft->stream_id  = stream_id;

  196.                     ft->size_mul   = frame_bytes + 2;

  197.                     ft->size_lsb   = frame_bytes + pred;

  198.                     ft->pts_delta  = pts;

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

  200.                     start2++;

  201.                 }

  202.         } else {

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

  204.             ft->flags     = FLAG_KEY | FLAG_SIZE_MSB;

  205.             ft->stream_id = stream_id;

  206.             ft->size_mul  = 1;

  207.             ft->pts_delta = 1;

  208.             start2++;

  209.         }

  210. 

  211.         if (codec->has_b_frames) {

  212.             pred_count    = 5;

  213.             pred_table[0] = -2;

  214.             pred_table[1] = -1;

  215.             pred_table[2] = 1;

  216.             pred_table[3] = 3;

  217.             pred_table[4] = 4;

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

  219.             pred_count    = 3;

  220.             pred_table[0] = 2;

  221.             pred_table[1] = 9;

  222.             pred_table[2] = 16;

  223.         } else {

  224.             pred_count    = 1;

  225.             pred_table[0] = 1;

  226.         }

  227. 

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

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

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

  231. 

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

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

  234.                 ft->flags     = FLAG_KEY * key_frame;

  235.                 ft->flags    |= FLAG_SIZE_MSB;

  236.                 ft->stream_id = stream_id;

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

  238.                 ft->size_mul  = end3 - start3;

  239.                 ft->size_lsb  = index - start3;

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

  241.                 if (is_audio)

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

  243.             }

  244.         }

  245.     }

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

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

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

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

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

  251. }

  252. 

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

  254.                    uint64_t val)

  255. {

  256.     val *= nut->time_base_count;

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

  258.     ff_put_v(bc, val);

  259. }

  260. /**

  261.  * Store a string as vb.

  262.  */

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

  264. {

  265.     int len = strlen(string);

  266. 

  267.     ff_put_v(bc, len);

  268.     avio_write(bc, string, len);

  269. }

  270. 

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

  272. {

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

  274. }

  275. 

  276. #ifdef TRACE

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

  278.                                   const char *func, int line)

  279. {

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

  281. 

  282.     ff_put_v(bc, v);

  283. }

  284. 

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

  286.                                const char *func, int line)

  287. {

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

  289. 

  290.     put_s(bc, v);

  291. }

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

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

  294. #endif

  295. 

  296. //FIXME remove calculate_checksum

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

  298.                        int calculate_checksum, uint64_t startcode)

  299. {

  300.     uint8_t *dyn_buf = NULL;

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

  302.     int forw_ptr     = dyn_size + 4 * calculate_checksum;

  303. 

  304.     if (forw_ptr > 4096)

  305.         ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  306.     avio_wb64(bc, startcode);

  307.     ff_put_v(bc, forw_ptr);

  308.     if (forw_ptr > 4096)

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

  310. 

  311.     if (calculate_checksum)

  312.         ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  313.     avio_write(bc, dyn_buf, dyn_size);

  314.     if (calculate_checksum)

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

  316. 

  317.     av_free(dyn_buf);

  318. }

  319. 

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

  321. {

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

  323.         tmp_head_idx;

  324.     int64_t tmp_match;

  325. 

  326.     ff_put_v(bc, 3); /* version */

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

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

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

  330. 

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

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

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

  334.     }

  335. 

  336.     tmp_pts      = 0;

  337.     tmp_mul      = 1;

  338.     tmp_stream   = 0;

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

  340.     tmp_head_idx = 0;

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

  342.         tmp_fields = 0;

  343.         tmp_size   = 0;

  344. //        tmp_res=0;

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

  346.             tmp_fields = 1;

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

  348.             tmp_fields = 2;

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

  350.             tmp_fields = 3;

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

  352.             tmp_fields = 4;

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

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

  355.             tmp_fields = 8;

  356. 

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

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

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

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

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

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

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

  364. 

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

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

  367.                 j--;

  368.                 continue;

  369.             }

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

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

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

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

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

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

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

  377.                 break;

  378.         }

  379.         if (j != tmp_mul - tmp_size)

  380.             tmp_fields = 6;

  381. 

  382.         ff_put_v(bc, tmp_flags);

  383.         ff_put_v(bc, tmp_fields);

  384.         if (tmp_fields > 0)

  385.             put_s(bc, tmp_pts);

  386.         if (tmp_fields > 1)

  387.             ff_put_v(bc, tmp_mul);

  388.         if (tmp_fields > 2)

  389.             ff_put_v(bc, tmp_stream);

  390.         if (tmp_fields > 3)

  391.             ff_put_v(bc, tmp_size);

  392.         if (tmp_fields > 4)

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

  394.         if (tmp_fields > 5)

  395.             ff_put_v(bc, j);

  396.         if (tmp_fields > 6)

  397.             ff_put_v(bc, tmp_match);

  398.         if (tmp_fields > 7)

  399.             ff_put_v(bc, tmp_head_idx);

  400.     }

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

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

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

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

  405.     }

  406. }

  407. 

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

  409.                               AVStream *st, int i)

  410. {

  411.     NUTContext *nut       = avctx->priv_data;

  412.     AVCodecContext *codec = st->codec;

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

  414. 

  415.     ff_put_v(bc, i);

  416.     switch (codec->codec_type) {

  417.     case AVMEDIA_TYPE_VIDEO:

  418.         ff_put_v(bc, 0);

  419.         break;

  420.     case AVMEDIA_TYPE_AUDIO:

  421.         ff_put_v(bc, 1);

  422.         break;

  423.     case AVMEDIA_TYPE_SUBTITLE:

  424.         ff_put_v(bc, 2);

  425.         break;

  426.     default:

  427.         ff_put_v(bc, 3);

  428.         break;

  429.     }

  430.     ff_put_v(bc, 4);

  431. 

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

  433.         codec_tag = codec->codec_tag;

  434. 

  435.     if (codec_tag) {

  436.         avio_wl32(bc, codec_tag);

  437.     } else {

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

  439.         return AVERROR(EINVAL);

  440.     }

  441. 

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

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

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

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

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

  447. 

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

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

  450. 

  451.     switch (codec->codec_type) {

  452.     case AVMEDIA_TYPE_AUDIO:

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

  454.         ff_put_v(bc, 1);

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

  456.         break;

  457.     case AVMEDIA_TYPE_VIDEO:

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

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

  460. 

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

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

  463.             ff_put_v(bc, 0);

  464.             ff_put_v(bc, 0);

  465.         } else {

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

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

  468.         }

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

  470.         break;

  471.     default:

  472.         break;

  473.     }

  474.     return 0;

  475. }

  476. 

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

  478. {

  479.     put_str(bc, type);

  480.     put_s(bc, -1);

  481.     put_str(bc, value);

  482.     return 1;

  483. }

  484. 

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

  486. {

  487.     AVFormatContext *s   = nut->avf;

  488.     AVDictionaryEntry *t = NULL;

  489.     AVIOContext *dyn_bc;

  490.     uint8_t *dyn_buf = NULL;

  491.     int count        = 0, dyn_size;

  492.     int ret          = avio_open_dyn_buf(&dyn_bc);

  493.     if (ret < 0)

  494.         return ret;

  495. 

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

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

  498. 

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

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

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

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

  503. 

  504.     ff_put_v(bc, count);

  505. 

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

  507.     avio_write(bc, dyn_buf, dyn_size);

  508.     av_free(dyn_buf);

  509.     return 0;

  510. }

  511. 

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

  513.     AVFormatContext *s= nut->avf;

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

  515.     AVIOContext *dyn_bc;

  516.     uint8_t *dyn_buf=NULL;

  517.     int count=0, dyn_size, i;

  518.     int ret = avio_open_dyn_buf(&dyn_bc);

  519.     if(ret < 0)

  520.         return ret;

  521. 

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

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

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

  525.     }

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

  527. 

  528.     if (count) {

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

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

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

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

  533. 

  534.         ff_put_v(bc, count);

  535. 

  536.         avio_write(bc, dyn_buf, dyn_size);

  537.     }

  538. 

  539.     av_free(dyn_buf);

  540.     return count;

  541. }

  542. 

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

  544. {

  545.     AVIOContext *dyn_bc;

  546.     uint8_t *dyn_buf     = NULL;

  547.     AVDictionaryEntry *t = NULL;

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

  549.     int ret, dyn_size, count = 0;

  550. 

  551.     ret = avio_open_dyn_buf(&dyn_bc);

  552.     if (ret < 0)

  553.         return ret;

  554. 

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

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

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

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

  559. 

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

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

  562. 

  563.     ff_put_v(bc, count);

  564. 

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

  566.     avio_write(bc, dyn_buf, dyn_size);

  567.     av_freep(&dyn_buf);

  568.     return 0;

  569. }

  570. 

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

  572. {

  573.     NUTContext *nut = avctx->priv_data;

  574.     AVIOContext *dyn_bc;

  575.     int i, ret;

  576. 

  577.     ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);

  578. 

  579.     ret = avio_open_dyn_buf(&dyn_bc);

  580.     if (ret < 0)

  581.         return ret;

  582.     write_mainheader(nut, dyn_bc);

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

  584. 

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

  586.         ret = avio_open_dyn_buf(&dyn_bc);

  587.         if (ret < 0)

  588.             return ret;

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

  590.         if (ret < 0)

  591.             return ret;

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

  593.     }

  594. 

  595.     ret = avio_open_dyn_buf(&dyn_bc);

  596.     if (ret < 0)

  597.         return ret;

  598.     write_globalinfo(nut, dyn_bc);

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

  600. 

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

  602.         ret = avio_open_dyn_buf(&dyn_bc);

  603.         if (ret < 0)

  604.             return ret;

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

  606.         if (ret < 0)

  607.             return ret;

  608.         if (ret > 0)

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

  610.         else {

  611.             uint8_t *buf;

  612.             avio_close_dyn_buf(dyn_bc, &buf);

  613.             av_free(buf);

  614.         }

  615.     }

  616. 

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

  618.         ret = avio_open_dyn_buf(&dyn_bc);

  619.         if (ret < 0)

  620.             return ret;

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

  622.         if (ret < 0) {

  623.             uint8_t *buf;

  624.             avio_close_dyn_buf(dyn_bc, &buf);

  625.             av_freep(&buf);

  626.             return ret;

  627.         }

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

  629.     }

  630. 

  631.     nut->last_syncpoint_pos = INT_MIN;

  632.     nut->header_count++;

  633.     return 0;

  634. }

  635. 

  636. static int nut_write_header(AVFormatContext *s)

  637. {

  638.     NUTContext *nut = s->priv_data;

  639.     AVIOContext *bc = s->pb;

  640.     int i, j, ret;

  641. 

  642.     nut->avf = s;

  643. 

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

  645.     if (s->nb_chapters)

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

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

  648.                                                       s->nb_chapters));

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

  650.         av_freep(&nut->stream);

  651.         av_freep(&nut->chapter);

  652.         av_freep(&nut->time_base);

  653.         return AVERROR(ENOMEM);

  654.     }

  655. 

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

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

  658.         int ssize;

  659.         AVRational time_base;

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

  661.                                  &time_base.num);

  662. 

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

  664. 

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

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

  667.                 break;

  668.             }

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

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

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

  672.             nut->time_base_count++;

  673. 

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

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

  676.         else

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

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

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

  680.     }

  681. 

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

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

  684. 

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

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

  687.                 break;

  688. 

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

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

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

  692.             nut->time_base_count++;

  693.     }

  694. 

  695.     nut->max_distance = MAX_DISTANCE;

  696.     build_elision_headers(s);

  697.     build_frame_code(s);

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

  699. 

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

  701.     avio_w8(bc, 0);

  702. 

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

  704.         return ret;

  705. 

  706.     avio_flush(bc);

  707. 

  708.     //FIXME index

  709. 

  710.     return 0;

  711. }

  712. 

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

  714.                             AVPacket *pkt)

  715. {

  716.     int flags = 0;

  717. 

  718.     if (pkt->flags & AV_PKT_FLAG_KEY)

  719.         flags |= FLAG_KEY;

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

  721.         flags |= FLAG_STREAM_ID;

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

  723.         flags |= FLAG_SIZE_MSB;

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

  725.         flags |= FLAG_CODED_PTS;

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

  727.         flags |= FLAG_CHECKSUM;

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

  729.         flags |= FLAG_CHECKSUM;

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

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

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

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

  734.         flags |= FLAG_HEADER_IDX;

  735. 

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

  737. }

  738. 

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

  740. {

  741.     int i;

  742.     int best_i   = 0;

  743.     int best_len = 0;

  744. 

  745.     if (pkt->size > 4096)

  746.         return 0;

  747. 

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

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

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

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

  752.             best_i   = i;

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

  754.         }

  755.     return best_i;

  756. }

  757. 

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

  759. {

  760.     NUTContext *nut    = s->priv_data;

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

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

  763.     FrameCode *fc;

  764.     int64_t coded_pts;

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

  766.         best_header_idx;

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

  768.     int store_sp  = 0;

  769.     int ret;

  770. 

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

  772.         av_log(s, AV_LOG_ERROR,

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

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

  775.         return AVERROR_INVALIDDATA;

  776.     }

  777. 

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

  779.         write_headers(s, bc);

  780. 

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

  782.         store_sp = 1;

  783. 

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

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

  786.         store_sp = 1;

  787. 

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

  789. 

  790.     if (store_sp) {

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

  792. 

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

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

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

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

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

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

  799.                 AV_ROUND_DOWN);

  800.             int index = av_index_search_timestamp(st, dts_tb,

  801.                                                   AVSEEK_FLAG_BACKWARD);

  802.             if (index >= 0)

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

  804.         }

  805.         if (dummy.pos == INT64_MAX)

  806.             dummy.pos = 0;

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

  808.                           NULL);

  809. 

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

  811.         ret                     = avio_open_dyn_buf(&dyn_bc);

  812.         if (ret < 0)

  813.             return ret;

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

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

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

  817. 

  818.         ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts);

  819.     }

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

  821. 

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

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

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

  825. 

  826.     best_header_idx = find_best_header_idx(nut, pkt);

  827. 

  828.     best_length = INT_MAX;

  829.     frame_code  = -1;

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

  831.         int length    = 0;

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

  833.         int flags     = fc->flags;

  834. 

  835.         if (flags & FLAG_INVALID)

  836.             continue;

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

  838. 

  839.         if (flags & FLAG_CODED) {

  840.             length++;

  841.             flags = needed_flags;

  842.         }

  843. 

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

  845.             continue;

  846. 

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

  848.             continue;

  849. 

  850.         if (flags & FLAG_STREAM_ID)

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

  852. 

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

  854.             continue;

  855.         if (flags & FLAG_SIZE_MSB)

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

  857. 

  858.         if (flags & FLAG_CHECKSUM)

  859.             length += 4;

  860. 

  861.         if (flags & FLAG_CODED_PTS)

  862.             length += ff_get_v_length(coded_pts);

  863. 

  864.         if ((flags & FLAG_CODED)

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

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

  867.             flags |= FLAG_HEADER_IDX;

  868.         }

  869. 

  870.         if (flags & FLAG_HEADER_IDX) {

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

  872.         } else {

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

  874.         }

  875. 

  876.         length *= 4;

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

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

  879. 

  880.         if (length < best_length) {

  881.             best_length = length;

  882.             frame_code  = i;

  883.         }

  884.     }

  885.     assert(frame_code != -1);

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

  887.     flags        = fc->flags;

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

  889.     header_idx   = fc->header_idx;

  890. 

  891.     ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);

  892.     avio_w8(bc, frame_code);

  893.     if (flags & FLAG_CODED) {

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

  895.         flags = needed_flags;

  896.     }

  897.     if (flags & FLAG_STREAM_ID)

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

  899.     if (flags & FLAG_CODED_PTS)

  900.         ff_put_v(bc, coded_pts);

  901.     if (flags & FLAG_SIZE_MSB)

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

  903.     if (flags & FLAG_HEADER_IDX)

  904.         ff_put_v(bc, header_idx = best_header_idx);

  905. 

  906.     if (flags & FLAG_CHECKSUM)

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

  908.     else

  909.         ffio_get_checksum(bc);

  910. 

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

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

  913.     nus->last_flags = flags;

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

  915. 

  916.     //FIXME just store one per syncpoint

  917.     if (flags & FLAG_KEY)

  918.         av_add_index_entry(

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

  920.             nut->last_syncpoint_pos,

  921.             pkt->pts,

  922.             0,

  923.             0,

  924.             AVINDEX_KEYFRAME);

  925. 

  926.     return 0;

  927. }

  928. 

  929. static int nut_write_trailer(AVFormatContext *s)

  930. {

  931.     NUTContext *nut = s->priv_data;

  932.     AVIOContext *bc = s->pb;

  933. 

  934.     while (nut->header_count < 3)

  935.         write_headers(s, bc);

  936. 

  937.     ff_nut_free_sp(nut);

  938.     av_freep(&nut->stream);

  939.     av_freep(&nut->chapter);

  940.     av_freep(&nut->time_base);

  941. 

  942.     return 0;

  943. }

  944. 

  945. AVOutputFormat ff_nut_muxer = {

  946.     .name           = "nut",

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

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

  949.     .extensions     = "nut",

  950.     .priv_data_size = sizeof(NUTContext),

  951.     .audio_codec    = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :

  952.                       CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,

  953.     .video_codec    = AV_CODEC_ID_MPEG4,

  954.     .write_header   = nut_write_header,

  955.     .write_packet   = nut_write_packet,

  956.     .write_trailer  = nut_write_trailer,

  957.     .flags          = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,

  958.     .codec_tag      = ff_nut_codec_tags,

  959. };