/* * nut muxer * Copyright (c) 2004-2007 Michael Niedermayer * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" #include "libavutil/tree.h" #include "libavutil/dict.h" #include "libavutil/time.h" #include "libavutil/opt.h" #include "libavcodec/mpegaudiodata.h" #include "nut.h" #include "internal.h" #include "avio_internal.h" #include "riff.h" static int find_expected_header(AVCodecParameters *p, int size, int key_frame, uint8_t out[64]) { int sample_rate = p->sample_rate; if (size > 4096) return 0; AV_WB24(out, 1); if (p->codec_id == AV_CODEC_ID_MPEG4) { if (key_frame) { return 3; } else { out[3] = 0xB6; return 4; } } else if (p->codec_id == AV_CODEC_ID_MPEG1VIDEO || p->codec_id == AV_CODEC_ID_MPEG2VIDEO) { return 3; } else if (p->codec_id == AV_CODEC_ID_H264) { return 3; } else if (p->codec_id == AV_CODEC_ID_MP3 || p->codec_id == AV_CODEC_ID_MP2) { int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size; int layer = p->codec_id == AV_CODEC_ID_MP3 ? 3 : 2; unsigned int header = 0xFFF00000; lsf = sample_rate < (24000 + 32000) / 2; mpeg25 = sample_rate < (12000 + 16000) / 2; sample_rate <<= lsf + mpeg25; if (sample_rate < (32000 + 44100) / 2) sample_rate_index = 2; else if (sample_rate < (44100 + 48000) / 2) sample_rate_index = 0; else sample_rate_index = 1; sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) { frame_size = avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1]; frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index & 1); if (frame_size == size) break; } header |= (!lsf) << 19; header |= (4 - layer) << 17; header |= 1 << 16; //no crc AV_WB32(out, header); if (size <= 0) return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead if (bitrate_index == 30) return -1; //something is wrong ... header |= (bitrate_index >> 1) << 12; header |= sample_rate_index << 10; header |= (bitrate_index & 1) << 9; return 2; //FIXME actually put the needed ones in build_elision_headers() //return 3; //we guess that the private bit is not set //FIXME the above assumptions should be checked, if these turn out false too often something should be done } return 0; } static int find_header_idx(AVFormatContext *s, AVCodecParameters *p, int size, int frame_type) { NUTContext *nut = s->priv_data; uint8_t out[64]; int i; int len = find_expected_header(p, size, frame_type, out); for (i = 1; i < nut->header_count; i++) { if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) { return i; } } return 0; } static void build_elision_headers(AVFormatContext *s) { NUTContext *nut = s->priv_data; int i; //FIXME this is lame //FIXME write a 2pass mode to find the maximal headers static const uint8_t headers[][5] = { { 3, 0x00, 0x00, 0x01 }, { 4, 0x00, 0x00, 0x01, 0xB6}, { 2, 0xFF, 0xFA }, //mp3+crc { 2, 0xFF, 0xFB }, //mp3 { 2, 0xFF, 0xFC }, //mp2+crc { 2, 0xFF, 0xFD }, //mp2 }; nut->header_count = 7; for (i = 1; i < nut->header_count; i++) { nut->header_len[i] = headers[i - 1][0]; nut->header[i] = &headers[i - 1][1]; } } static void build_frame_code(AVFormatContext *s) { NUTContext *nut = s->priv_data; int key_frame, index, pred, stream_id; int start = 1; int end = 254; int keyframe_0_esc = s->nb_streams > 2; int pred_table[10]; FrameCode *ft; ft = &nut->frame_code[start]; ft->flags = FLAG_CODED; ft->size_mul = 1; ft->pts_delta = 1; start++; if (keyframe_0_esc) { /* keyframe = 0 escape */ FrameCode *ft = &nut->frame_code[start]; ft->flags = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS; ft->size_mul = 1; start++; } for (stream_id = 0; stream_id < s->nb_streams; stream_id++) { int start2 = start + (end - start) * stream_id / s->nb_streams; int end2 = start + (end - start) * (stream_id + 1) / s->nb_streams; AVCodecParameters *par = s->streams[stream_id]->codecpar; const AVCodecDescriptor *desc = avcodec_descriptor_get(par->codec_id); int is_audio = par->codec_type == AVMEDIA_TYPE_AUDIO; int intra_only = /*codec->intra_only || */ is_audio; int pred_count; for (key_frame = 0; key_frame < 2; key_frame++) { if (!intra_only || !keyframe_0_esc || key_frame != 0) { FrameCode *ft = &nut->frame_code[start2]; ft->flags = FLAG_KEY * key_frame; ft->flags |= FLAG_SIZE_MSB | FLAG_CODED_PTS; ft->stream_id = stream_id; ft->size_mul = 1; if (is_audio) ft->header_idx = find_header_idx(s, par, -1, key_frame); start2++; } } key_frame = intra_only; if (is_audio) { int frame_bytes; int pts; if (par->block_align > 0) { frame_bytes = par->block_align; } else { int frame_size = av_get_audio_frame_duration2(par, 0); frame_bytes = frame_size * (int64_t)par->bit_rate / (8 * par->sample_rate); } for (pts = 0; pts < 2; pts++) for (pred = 0; pred < 2; pred++) { FrameCode *ft = &nut->frame_code[start2]; ft->flags = FLAG_KEY * key_frame; ft->stream_id = stream_id; ft->size_mul = frame_bytes + 2; ft->size_lsb = frame_bytes + pred; ft->pts_delta = pts; ft->header_idx = find_header_idx(s, par, frame_bytes + pred, key_frame); start2++; } } else { FrameCode *ft = &nut->frame_code[start2]; ft->flags = FLAG_KEY | FLAG_SIZE_MSB; ft->stream_id = stream_id; ft->size_mul = 1; ft->pts_delta = 1; start2++; } if (desc && desc->props & AV_CODEC_PROP_REORDER) { pred_count = 5; pred_table[0] = -2; pred_table[1] = -1; pred_table[2] = 1; pred_table[3] = 3; pred_table[4] = 4; } else if (par->codec_id == AV_CODEC_ID_VORBIS) { pred_count = 3; pred_table[0] = 2; pred_table[1] = 9; pred_table[2] = 16; } else { pred_count = 1; pred_table[0] = 1; } for (pred = 0; pred < pred_count; pred++) { int start3 = start2 + (end2 - start2) * pred / pred_count; int end3 = start2 + (end2 - start2) * (pred + 1) / pred_count; for (index = start3; index < end3; index++) { FrameCode *ft = &nut->frame_code[index]; ft->flags = FLAG_KEY * key_frame; ft->flags |= FLAG_SIZE_MSB; ft->stream_id = stream_id; //FIXME use single byte size and pred from last ft->size_mul = end3 - start3; ft->size_lsb = index - start3; ft->pts_delta = pred_table[pred]; if (is_audio) ft->header_idx = find_header_idx(s, par, -1, key_frame); } } } memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'], sizeof(FrameCode) * (255 - 'N')); nut->frame_code[0].flags = nut->frame_code[255].flags = nut->frame_code['N'].flags = FLAG_INVALID; } static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val) { val *= nut->time_base_count; val += time_base - nut->time_base; ff_put_v(bc, val); } /** * Store a string as vb. */ static void put_str(AVIOContext *bc, const char *string) { int len = strlen(string); ff_put_v(bc, len); avio_write(bc, string, len); } static void put_s(AVIOContext *bc, int64_t val) { ff_put_v(bc, 2 * FFABS(val) - (val > 0)); } #ifdef TRACE static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file, const char *func, int line) { av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); ff_put_v(bc, v); } static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file, const char *func, int line) { av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); put_s(bc, v); } #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) #endif //FIXME remove calculate_checksum static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode) { uint8_t *dyn_buf = NULL; int dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); int forw_ptr = dyn_size + 4 * calculate_checksum; if (forw_ptr > 4096) ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); avio_wb64(bc, startcode); ff_put_v(bc, forw_ptr); if (forw_ptr > 4096) avio_wl32(bc, ffio_get_checksum(bc)); if (calculate_checksum) ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); avio_write(bc, dyn_buf, dyn_size); if (calculate_checksum) avio_wl32(bc, ffio_get_checksum(bc)); av_free(dyn_buf); } static void write_mainheader(NUTContext *nut, AVIOContext *bc) { int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx; int64_t tmp_match; ff_put_v(bc, nut->version); ff_put_v(bc, nut->avf->nb_streams); ff_put_v(bc, nut->max_distance); ff_put_v(bc, nut->time_base_count); for (i = 0; i < nut->time_base_count; i++) { ff_put_v(bc, nut->time_base[i].num); ff_put_v(bc, nut->time_base[i].den); } tmp_pts = 0; tmp_mul = 1; tmp_stream = 0; tmp_match = 1 - (1LL << 62); tmp_head_idx = 0; for (i = 0; i < 256; ) { tmp_fields = 0; tmp_size = 0; // tmp_res=0; if (tmp_pts != nut->frame_code[i].pts_delta) tmp_fields = 1; if (tmp_mul != nut->frame_code[i].size_mul) tmp_fields = 2; if (tmp_stream != nut->frame_code[i].stream_id) tmp_fields = 3; if (tmp_size != nut->frame_code[i].size_lsb) tmp_fields = 4; // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; if (tmp_head_idx != nut->frame_code[i].header_idx) tmp_fields = 8; tmp_pts = nut->frame_code[i].pts_delta; tmp_flags = nut->frame_code[i].flags; tmp_stream = nut->frame_code[i].stream_id; tmp_mul = nut->frame_code[i].size_mul; tmp_size = nut->frame_code[i].size_lsb; // tmp_res = nut->frame_code[i].res; tmp_head_idx = nut->frame_code[i].header_idx; for (j = 0; i < 256; j++, i++) { if (i == 'N') { j--; continue; } if (nut->frame_code[i].pts_delta != tmp_pts || nut->frame_code[i].flags != tmp_flags || nut->frame_code[i].stream_id != tmp_stream || nut->frame_code[i].size_mul != tmp_mul || nut->frame_code[i].size_lsb != tmp_size + j || // nut->frame_code[i].res != tmp_res || nut->frame_code[i].header_idx != tmp_head_idx) break; } if (j != tmp_mul - tmp_size) tmp_fields = 6; ff_put_v(bc, tmp_flags); ff_put_v(bc, tmp_fields); if (tmp_fields > 0) put_s(bc, tmp_pts); if (tmp_fields > 1) ff_put_v(bc, tmp_mul); if (tmp_fields > 2) ff_put_v(bc, tmp_stream); if (tmp_fields > 3) ff_put_v(bc, tmp_size); if (tmp_fields > 4) ff_put_v(bc, 0 /*tmp_res*/); if (tmp_fields > 5) ff_put_v(bc, j); if (tmp_fields > 6) ff_put_v(bc, tmp_match); if (tmp_fields > 7) ff_put_v(bc, tmp_head_idx); } ff_put_v(bc, nut->header_count - 1); for (i = 1; i < nut->header_count; i++) { ff_put_v(bc, nut->header_len[i]); avio_write(bc, nut->header[i], nut->header_len[i]); } // flags had been effectively introduced in version 4 if (nut->version > NUT_STABLE_VERSION) ff_put_v(bc, nut->flags); } static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i) { NUTContext *nut = avctx->priv_data; AVCodecParameters *par = st->codecpar; const AVCodecDescriptor *desc = avcodec_descriptor_get(par->codec_id); unsigned codec_tag = av_codec_get_tag(ff_nut_codec_tags, par->codec_id); ff_put_v(bc, i); switch (par->codec_type) { case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break; case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break; case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break; default: ff_put_v(bc, 3); break; } ff_put_v(bc, 4); if (av_codec_get_id(ff_nut_codec_tags, par->codec_tag) == par->codec_id || !codec_tag || par->codec_id == AV_CODEC_ID_RAWVIDEO) codec_tag = par->codec_tag; if (codec_tag) { avio_wl32(bc, codec_tag); } else { av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i); return AVERROR(EINVAL); } ff_put_v(bc, nut->stream[i].time_base - nut->time_base); ff_put_v(bc, nut->stream[i].msb_pts_shift); ff_put_v(bc, nut->stream[i].max_pts_distance); ff_put_v(bc, (desc && desc->props & AV_CODEC_PROP_REORDER) ? 16 : 0); avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ ff_put_v(bc, par->extradata_size); avio_write(bc, par->extradata, par->extradata_size); switch (par->codec_type) { case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, par->sample_rate); ff_put_v(bc, 1); ff_put_v(bc, par->channels); break; case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, par->width); ff_put_v(bc, par->height); if (st->sample_aspect_ratio.num <= 0 || st->sample_aspect_ratio.den <= 0) { ff_put_v(bc, 0); ff_put_v(bc, 0); } else { ff_put_v(bc, st->sample_aspect_ratio.num); ff_put_v(bc, st->sample_aspect_ratio.den); } ff_put_v(bc, 0); /* csp type -- unknown */ break; default: break; } return 0; } static int add_info(AVIOContext *bc, const char *type, const char *value) { put_str(bc, type); put_s(bc, -1); put_str(bc, value); return 1; } static int write_globalinfo(NUTContext *nut, AVIOContext *bc) { AVFormatContext *s = nut->avf; AVDictionaryEntry *t = NULL; AVIOContext *dyn_bc; uint8_t *dyn_buf = NULL; int count = 0, dyn_size; int ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) count += add_info(dyn_bc, t->key, t->value); ff_put_v(bc, 0); //stream_if_plus1 ff_put_v(bc, 0); //chapter_id ff_put_v(bc, 0); //timestamp_start ff_put_v(bc, 0); //length ff_put_v(bc, count); dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); avio_write(bc, dyn_buf, dyn_size); av_free(dyn_buf); return 0; } static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){ AVFormatContext *s= nut->avf; AVStream* st = s->streams[stream_id]; AVIOContext *dyn_bc; uint8_t *dyn_buf=NULL; int count=0, dyn_size, i; int ret = avio_open_dyn_buf(&dyn_bc); if(ret < 0) return ret; for (i=0; ff_nut_dispositions[i].flag; ++i) { if (st->disposition & ff_nut_dispositions[i].flag) count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str); } dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); if (count) { ff_put_v(bc, stream_id + 1); //stream_id_plus1 ff_put_v(bc, 0); //chapter_id ff_put_v(bc, 0); //timestamp_start ff_put_v(bc, 0); //length ff_put_v(bc, count); avio_write(bc, dyn_buf, dyn_size); } av_free(dyn_buf); return count; } static int write_chapter(NUTContext *nut, AVIOContext *bc, int id) { AVIOContext *dyn_bc; uint8_t *dyn_buf = NULL; AVDictionaryEntry *t = NULL; AVChapter *ch = nut->avf->chapters[id]; int ret, dyn_size, count = 0; ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; ff_put_v(bc, 0); // stream_id_plus1 put_s(bc, id + 1); // chapter_id put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start ff_put_v(bc, ch->end - ch->start); // chapter_len while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) count += add_info(dyn_bc, t->key, t->value); ff_put_v(bc, count); dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); avio_write(bc, dyn_buf, dyn_size); av_freep(&dyn_buf); return 0; } static int write_headers(AVFormatContext *avctx, AVIOContext *bc) { NUTContext *nut = avctx->priv_data; AVIOContext *dyn_bc; int i, ret; ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL); ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; write_mainheader(nut, dyn_bc); put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE); for (i = 0; i < nut->avf->nb_streams; i++) { ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i); if (ret < 0) return ret; put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE); } ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; write_globalinfo(nut, dyn_bc); put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); for (i = 0; i < nut->avf->nb_streams; i++) { ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; ret = write_streaminfo(nut, dyn_bc, i); if (ret < 0) return ret; if (ret > 0) put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); else ffio_free_dyn_buf(&dyn_bc); } for (i = 0; i < nut->avf->nb_chapters; i++) { ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; ret = write_chapter(nut, dyn_bc, i); if (ret < 0) { ffio_free_dyn_buf(&dyn_bc); return ret; } put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); } nut->last_syncpoint_pos = INT_MIN; nut->header_count++; return 0; } static int nut_write_header(AVFormatContext *s) { NUTContext *nut = s->priv_data; AVIOContext *bc = s->pb; int i, j, ret; nut->avf = s; nut->version = NUT_STABLE_VERSION + !!nut->flags; if (nut->flags && s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) { av_log(s, AV_LOG_ERROR, "The additional syncpoint modes require version %d, " "that is currently not finalized, " "please set -f_strict experimental in order to enable it.\n", nut->version); return AVERROR_EXPERIMENTAL; } nut->stream = av_mallocz(sizeof(StreamContext) * s->nb_streams); if (s->nb_chapters) nut->chapter = av_mallocz(sizeof(ChapterContext) * s->nb_chapters); nut->time_base = av_mallocz(sizeof(AVRational) * (s->nb_streams + s->nb_chapters)); if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) { av_freep(&nut->stream); av_freep(&nut->chapter); av_freep(&nut->time_base); return AVERROR(ENOMEM); } for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; int ssize; AVRational time_base; ff_parse_specific_params(st, &time_base.den, &ssize, &time_base.num); avpriv_set_pts_info(st, 64, time_base.num, time_base.den); for (j = 0; j < nut->time_base_count; j++) if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) { break; } nut->time_base[j] = time_base; nut->stream[i].time_base = &nut->time_base[j]; if (j == nut->time_base_count) nut->time_base_count++; if (INT64_C(1000) * time_base.num >= time_base.den) nut->stream[i].msb_pts_shift = 7; else nut->stream[i].msb_pts_shift = 14; nut->stream[i].max_pts_distance = FFMAX(time_base.den, time_base.num) / time_base.num; } for (i = 0; i < s->nb_chapters; i++) { AVChapter *ch = s->chapters[i]; for (j = 0; j < nut->time_base_count; j++) if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational))) break; nut->time_base[j] = ch->time_base; nut->chapter[i].time_base = &nut->time_base[j]; if (j == nut->time_base_count) nut->time_base_count++; } nut->max_distance = MAX_DISTANCE; build_elision_headers(s); build_frame_code(s); assert(nut->frame_code['N'].flags == FLAG_INVALID); avio_write(bc, ID_STRING, strlen(ID_STRING)); avio_w8(bc, 0); if ((ret = write_headers(s, bc)) < 0) return ret; avio_flush(bc); //FIXME index return 0; } static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt) { int flags = 0; if (pkt->flags & AV_PKT_FLAG_KEY) flags |= FLAG_KEY; if (pkt->stream_index != fc->stream_id) flags |= FLAG_STREAM_ID; if (pkt->size / fc->size_mul) flags |= FLAG_SIZE_MSB; if (pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS; if (pkt->size > 2 * nut->max_distance) flags |= FLAG_CHECKSUM; if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance) flags |= FLAG_CHECKSUM; if (pkt->size < nut->header_len[fc->header_idx] || (pkt->size > 4096 && fc->header_idx) || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx])) flags |= FLAG_HEADER_IDX; return flags | (fc->flags & FLAG_CODED); } static int find_best_header_idx(NUTContext *nut, AVPacket *pkt) { int i; int best_i = 0; int best_len = 0; if (pkt->size > 4096) return 0; for (i = 1; i < nut->header_count; i++) if (pkt->size >= nut->header_len[i] && nut->header_len[i] > best_len && !memcmp(pkt->data, nut->header[i], nut->header_len[i])) { best_i = i; best_len = nut->header_len[i]; } return best_i; } static int nut_write_packet(AVFormatContext *s, AVPacket *pkt) { NUTContext *nut = s->priv_data; StreamContext *nus = &nut->stream[pkt->stream_index]; AVIOContext *bc = s->pb, *dyn_bc; FrameCode *fc; int64_t coded_pts; int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx; int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY); int store_sp = 0; int ret; if (pkt->pts < 0) { av_log(s, AV_LOG_ERROR, "Negative pts not supported stream %d, pts %"PRId64"\n", pkt->stream_index, pkt->pts); return AVERROR_INVALIDDATA; } if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc)) write_headers(s, bc); if (key_frame && !(nus->last_flags & FLAG_KEY)) store_sp = 1; if (pkt->size + 30 /*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance) store_sp = 1; //FIXME: Ensure store_sp is 1 in the first place. if (store_sp && (!(nut->flags & NUT_PIPE) || nut->last_syncpoint_pos == INT_MIN)) { Syncpoint *sp, dummy = { .pos = INT64_MAX }; ff_nut_reset_ts(nut, *nus->time_base, pkt->dts); for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; int64_t dts_tb = av_rescale_rnd(pkt->dts, nus->time_base->num * (int64_t)nut->stream[i].time_base->den, nus->time_base->den * (int64_t)nut->stream[i].time_base->num, AV_ROUND_DOWN); int index = av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD); if (index >= 0) dummy.pos = FFMIN(dummy.pos, st->index_entries[index].pos); } if (dummy.pos == INT64_MAX) dummy.pos = 0; sp = av_tree_find(nut->syncpoints, &dummy, (void *)ff_nut_sp_pos_cmp, NULL); nut->last_syncpoint_pos = avio_tell(bc); ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; put_tt(nut, nus->time_base, dyn_bc, pkt->dts); ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos) >> 4 : 0); if (nut->flags & NUT_BROADCAST) { put_tt(nut, nus->time_base, dyn_bc, av_rescale_q(av_gettime(), AV_TIME_BASE_Q, *nus->time_base)); } put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE); if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts)) < 0) return ret; } assert(nus->last_pts != AV_NOPTS_VALUE); coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1); if (ff_lsb2full(nus, coded_pts) != pkt->pts) coded_pts = pkt->pts + (1 << nus->msb_pts_shift); best_header_idx = find_best_header_idx(nut, pkt); best_length = INT_MAX; frame_code = -1; for (i = 0; i < 256; i++) { int length = 0; FrameCode *fc = &nut->frame_code[i]; int flags = fc->flags; if (flags & FLAG_INVALID) continue; needed_flags = get_needed_flags(nut, nus, fc, pkt); if (flags & FLAG_CODED) { length++; flags = needed_flags; } if ((flags & needed_flags) != needed_flags) continue; if ((flags ^ needed_flags) & FLAG_KEY) continue; if (flags & FLAG_STREAM_ID) length += ff_get_v_length(pkt->stream_index); if (pkt->size % fc->size_mul != fc->size_lsb) continue; if (flags & FLAG_SIZE_MSB) length += ff_get_v_length(pkt->size / fc->size_mul); if (flags & FLAG_CHECKSUM) length += 4; if (flags & FLAG_CODED_PTS) length += ff_get_v_length(coded_pts); if ((flags & FLAG_CODED) && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx] + 1) { flags |= FLAG_HEADER_IDX; } if (flags & FLAG_HEADER_IDX) { length += 1 - nut->header_len[best_header_idx]; } else { length -= nut->header_len[fc->header_idx]; } length *= 4; length += !(flags & FLAG_CODED_PTS); length += !(flags & FLAG_CHECKSUM); if (length < best_length) { best_length = length; frame_code = i; } } if (frame_code < 0) return AVERROR_BUG; fc = &nut->frame_code[frame_code]; flags = fc->flags; needed_flags = get_needed_flags(nut, nus, fc, pkt); header_idx = fc->header_idx; ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); avio_w8(bc, frame_code); if (flags & FLAG_CODED) { ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED)); flags = needed_flags; } if (flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index); if (flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts); if (flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul); if (flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx = best_header_idx); if (flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc)); else ffio_get_checksum(bc); avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]); nus->last_flags = flags; nus->last_pts = pkt->pts; //FIXME just store one per syncpoint if (flags & FLAG_KEY && !(nut->flags & NUT_PIPE)) av_add_index_entry( s->streams[pkt->stream_index], nut->last_syncpoint_pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME); return 0; } static int nut_write_trailer(AVFormatContext *s) { NUTContext *nut = s->priv_data; AVIOContext *bc = s->pb; while (nut->header_count < 3) write_headers(s, bc); ff_nut_free_sp(nut); av_freep(&nut->stream); av_freep(&nut->chapter); av_freep(&nut->time_base); return 0; } #define OFFSET(x) offsetof(NUTContext, x) #define E AV_OPT_FLAG_ENCODING_PARAM static const AVOption options[] = { { "syncpoints", "NUT syncpoint behaviour", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, E, "syncpoints" }, { "default", "", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, E, "syncpoints" }, { "none", "Disable syncpoints, low overhead and unseekable", 0, AV_OPT_TYPE_CONST, {.i64 = NUT_PIPE}, INT_MIN, INT_MAX, E, "syncpoints" }, { "timestamped", "Extend syncpoints with a wallclock timestamp", 0, AV_OPT_TYPE_CONST, {.i64 = NUT_BROADCAST}, INT_MIN, INT_MAX, E, "syncpoints" }, { NULL }, }; static const AVClass class = { .class_name = "nutenc", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVOutputFormat ff_nut_muxer = { .name = "nut", .long_name = NULL_IF_CONFIG_SMALL("NUT"), .mime_type = "video/x-nut", .extensions = "nut", .priv_data_size = sizeof(NUTContext), .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS : CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2, .video_codec = AV_CODEC_ID_MPEG4, .write_header = nut_write_header, .write_packet = nut_write_packet, .write_trailer = nut_write_trailer, .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, .codec_tag = ff_nut_codec_tags, .priv_class = &class, };