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ffmpeg/libavformat/nutenc.c

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/*
* 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 "libavcodec/mpegaudiodata.h"
#include "nut.h"
#include "internal.h"
#include "avio_internal.h"
#include "riff.h"
static int find_expected_header(AVCodecContext *c, int size, int key_frame,
uint8_t out[64])
{
int sample_rate = c->sample_rate;
if (size > 4096)
return 0;
AV_WB24(out, 1);
if (c->codec_id == AV_CODEC_ID_MPEG4) {
if (key_frame) {
return 3;
} else {
out[3] = 0xB6;
return 4;
}
} else if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
return 3;
} else if (c->codec_id == AV_CODEC_ID_H264) {
return 3;
} else if (c->codec_id == AV_CODEC_ID_MP3 ||
c->codec_id == AV_CODEC_ID_MP2) {
int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
int layer = c->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, AVCodecContext *c, int size,
int frame_type)
{
NUTContext *nut = s->priv_data;
uint8_t out[64];
int i;
int len = find_expected_header(c, 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;
AVCodecContext *codec = s->streams[stream_id]->codec;
int is_audio = codec->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, codec, -1, key_frame);
start2++;
}
}
key_frame = intra_only;
if (is_audio) {
int frame_bytes = codec->frame_size * (int64_t)codec->bit_rate /
(8 * codec->sample_rate);
int pts;
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, codec, 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 (codec->has_b_frames) {
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 (codec->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, codec, -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]);
}
}
static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc,
AVStream *st, int i)
{
NUTContext *nut = avctx->priv_data;
AVCodecContext *codec = st->codec;
unsigned codec_tag = av_codec_get_tag(ff_nut_codec_tags, codec->codec_id);
ff_put_v(bc, i);
switch (codec->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 (!codec_tag || codec->codec_id == AV_CODEC_ID_RAWVIDEO)
codec_tag = codec->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, codec->has_b_frames);
avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
ff_put_v(bc, codec->extradata_size);
avio_write(bc, codec->extradata, codec->extradata_size);
switch (codec->codec_type) {
case AVMEDIA_TYPE_AUDIO:
ff_put_v(bc, codec->sample_rate);
ff_put_v(bc, 1);
ff_put_v(bc, codec->channels);
break;
case AVMEDIA_TYPE_VIDEO:
ff_put_v(bc, codec->width);
ff_put_v(bc, codec->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 {
uint8_t *buf;
avio_close_dyn_buf(dyn_bc, &buf);
av_free(buf);
}
}
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) {
uint8_t *buf;
avio_close_dyn_buf(dyn_bc, &buf);
av_freep(&buf);
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->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->codec, &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) {
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);
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;
}
}
assert(frame_code != -1);
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)
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;
}
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,
};
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