+++ /dev/null
-/*
- * NUT (de)muxer based on initial draft
- * Copyright (c) 2003 Alex Beregszaszi
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt
- *
- * Compatible with draft version 20030906
- *
- */
-
-/*
- * TODO:
- * - checksumming
- * - correct rate denom/nom and sample_mul
- * - correct timestamp handling
- * - index writing
- * - info and index packet reading support
- * - startcode searching for broken streams
- * - subpacket support
- * - handling of codec specific headers
-*/
-
-//#define DEBUG 1
-
-#include "avformat.h"
-#include "mpegaudio.h"
-#include "avi.h"
-
-//from /dev/random
-
-#define MAIN_STARTCODE (0xF9526A6200000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'M')
-#define STREAM_STARTCODE (0xD667773F00000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'S')
-#define KEYFRAME_STARTCODE (0xCB86308700000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'K')
-#define INDEX_STARTCODE (0xEBFCDE0E00000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'X')
-#define INFO_STARTCODE (0xA37B643500000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'I')
-
-typedef struct {
- int curr_frame_start;
- int last_frame_size;
- int curr_frame_size;
-} NUTContext;
-
-static int bytes_left(ByteIOContext *bc)
-{
- return bc->buf_end - bc->buf_ptr;
-}
-
-static uint64_t get_v(ByteIOContext *bc)
-{
- uint64_t val = 0;
-
-// for (; bytes_left(s)*8 > 0; )
- for(; bytes_left(bc) > 0; )
- {
- int tmp = get_byte(bc);
-
- if (tmp&0x80)
- val= (val<<7) + tmp - 0x80;
- else
- return (val<<7) + tmp;
- }
- return -1;
-}
-
-static int64_t get_s(ByteIOContext *bc)
-{
- int64_t v = get_v(bc) + 1;
-
- if (v&1)
- return -(v>>1);
- else
- return (v>>1);
-}
-
-static int get_b(ByteIOContext *bc, char *data, int maxlen)
-{
- int i, len;
-
- len = get_v(bc);
- for (i = 0; i < len && i < maxlen; i++)
- data[i] = get_byte(bc);
- if (i < len)
- {
- len = i;
- for (i = 0; i < len; i++)
- get_byte(bc);
- }
-
- return 0;
-}
-
-static int get_bi(ByteIOContext *bc)
-{
- int i, len, val;
-
- len = get_v(bc);
- if(len > 4) return -1;
-
- val = 0;
- for (i = 0; i < len; i++) {
- val |= get_byte(bc) << (i * 8);
- }
-
- return val;
-}
-
-static int get_packetheader(NUTContext *nut, ByteIOContext *bc)
-{
- nut->curr_frame_start = url_ftell(bc);
- nut->curr_frame_size = get_v(bc);
- nut->last_frame_size = get_v(bc);
- dprintf("Packet: fwd: %d bwd: %d\n",
- nut->curr_frame_size, nut->last_frame_size);
-
- return 0;
-}
-
-/**
- *
- */
-static int get_length(uint64_t val){
- int i;
-
- for (i=7; ; i+=7)
- if ((val>>i) == 0)
- return i;
-
- return 7; //not reached
-}
-
-static int put_v(ByteIOContext *bc, uint64_t val)
-{
- int i;
-
-// if (bytes_left(s)*8 < 9)
-// return -1;
-
- if (bytes_left(bc) < 1)
- return -1;
-
- val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
- i= get_length(val);
-
- for (i-=7; i>0; i-=7){
- put_byte(bc, 0x80 | (val>>i));
- }
-
- put_byte(bc, val&0x7f);
-
- return 0;
-}
-
-static int put_s(ByteIOContext *bc, uint64_t val)
-{
- if (val<=0)
- return put_v(bc, -2*val);
- else
- return put_v(bc, 2*val-1);
-}
-
-static int put_b(ByteIOContext *bc, char *data, int len)
-{
- int i;
-
- put_v(bc, len);
- for (i = 0; i < len; i++)
- put_byte(bc, data[i]);
-
- return 0;
-}
-
-static int put_bi(ByteIOContext *bc, int val)
-{
- put_v(bc, 4);
- put_le32(bc, val);
- return 0;
-}
-
-static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size)
-{
- put_flush_packet(bc);
- nut->curr_frame_start = url_ftell(bc);
- nut->curr_frame_size = max_size;
-
- /* packet header */
- put_v(bc, nut->curr_frame_size); /* forward ptr */
- put_v(bc, nut->last_frame_size); /* backward ptr */
- dprintf("Packet: fwd: %d, bwd: %d\n",
- nut->curr_frame_size, nut->last_frame_size);
-
- nut->last_frame_size = nut->curr_frame_size;
-
- return 0;
-}
-
-static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size){
- offset_t start= nut->curr_frame_start;
- offset_t cur= url_ftell(bc);
- int size= cur - start + additional_size;
-
- assert( size <= nut->curr_frame_size );
-
- url_fseek(bc, start, SEEK_SET);
- put_v(bc, size);
- if(get_length(size) < get_length(nut->curr_frame_size))
- put_byte(bc, 0x80);
- nut->curr_frame_size= size;
- dprintf("Packet update: size: %d\n", size);
-
- url_fseek(bc, cur, SEEK_SET);
-
- return 0;
-}
-
-static int nut_write_header(AVFormatContext *s)
-{
- NUTContext *nut = s->priv_data;
- ByteIOContext *bc = &s->pb;
- AVCodecContext *codec;
- int i;
- int stream_length = 0;
-
- for (i = 0; i < s->nb_streams; i++)
- {
- if (stream_length < (s->streams[i]->duration * (AV_TIME_BASE / 1000)))
- stream_length = s->streams[i]->duration * (AV_TIME_BASE / 1000);
- }
-
- /* main header */
- put_be64(bc, MAIN_STARTCODE);
- put_packetheader(nut, bc, 120);
- put_v(bc, 0); /* version */
- put_v(bc, s->nb_streams);
- put_v(bc, 0); /* file size */
- put_v(bc, stream_length); /* len in msec */
- put_be32(bc, 0); /* FIXME: checksum */
-
- update_packetheader(nut, bc, 0);
-
- /* stream headers */
- for (i = 0; i < s->nb_streams; i++)
- {
- codec = &s->streams[i]->codec;
-
- put_be64(bc, STREAM_STARTCODE);
- put_packetheader(nut, bc, 120);
- put_v(bc, i /*s->streams[i]->index*/);
- put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
- if (codec->codec_tag)
- put_bi(bc, codec->codec_tag);
- else if (codec->codec_type == CODEC_TYPE_VIDEO)
- {
- int tmp = codec_get_bmp_tag(codec->codec_id);
- put_bi(bc, tmp);
- }
- else if (codec->codec_type == CODEC_TYPE_AUDIO)
- {
- int tmp = codec_get_wav_tag(codec->codec_id);
- put_bi(bc, tmp);
- }
- put_v(bc, codec->bit_rate);
- put_v(bc, 0); /* no language code */
- put_v(bc, codec->frame_rate_base);
- put_v(bc, codec->frame_rate);
- put_v(bc, 0); /* timestamp_shift */
- put_v(bc, 0); /* shuffle type */
- put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
-
- put_v(bc, 0); /* no codec specific headers */
-
- switch(codec->codec_type)
- {
- case CODEC_TYPE_AUDIO:
- put_v(bc, codec->sample_rate / (double)(codec->frame_rate_base / codec->frame_rate));
- put_v(bc, codec->channels);
- put_be32(bc, 0); /* FIXME: checksum */
- break;
- case CODEC_TYPE_VIDEO:
- put_v(bc, codec->width);
- put_v(bc, codec->height);
- put_v(bc, 0); /* aspected w */
- put_v(bc, 0); /* aspected h */
- put_v(bc, 0); /* csp type -- unknown */
- put_be32(bc, 0); /* FIXME: checksum */
- break;
- default:
- break;
- }
- update_packetheader(nut, bc, 0);
- }
-
-#if 0
- /* info header */
- put_be64(bc, INFO_STARTCODE);
- put_packetheader(nut, bc, 16+strlen(s->author)+strlen(s->title)+
- strlen(s->comment)+strlen(s->copyright));
- if (s->author[0])
- {
- put_v(bc, 5); /* type */
- put_b(bc, s->author, strlen(s->author));
- }
- if (s->title[0])
- {
- put_v(bc, 6); /* type */
- put_b(bc, s->title, strlen(s->title));
- }
- if (s->comment[0])
- {
- put_v(bc, 7); /* type */
- put_b(bc, s->comment, strlen(s->comment));
- }
- if (s->copyright[0])
- {
- put_v(bc, 8); /* type */
- put_b(bc, s->copyright, strlen(s->copyright));
- }
- /* encoder */
- put_v(bc, 9); /* type */
- put_b(bc, LIBAVFORMAT_IDENT "\0", strlen(LIBAVFORMAT_IDENT));
-
- put_v(bc, 0); /* eof info */
-
- put_be32(bc, 0); /* FIXME: checksum */
- update_packetheader(nut, bc, 0);
-#endif
-
- put_flush_packet(bc);
-
- return 0;
-}
-
-static int nut_write_packet(AVFormatContext *s, int stream_index,
- const uint8_t *buf, int size, int64_t pts)
-{
- NUTContext *nut = s->priv_data;
- ByteIOContext *bc = &s->pb;
- int key_frame = 0;
- int flags;
- AVCodecContext *enc;
-
- if (stream_index > s->nb_streams)
- return 1;
-
- enc = &s->streams[stream_index]->codec;
- key_frame = enc->coded_frame->key_frame;
-
- if (key_frame)
- put_be64(bc, KEYFRAME_STARTCODE);
-
- flags=0;
- flags<<=2; flags|=1; //priority
- flags<<=1; flags|=0; //checksum
- flags<<=1; flags|=0; //msb_timestamp_flag
- flags<<=2; flags|=1; //subpacket_type
- flags<<=1; flags|=0; //reserved
-
- put_byte(bc, flags);
-
- put_packetheader(nut, bc, size+20);
- put_v(bc, stream_index);
- put_s(bc, pts); /* lsb_timestamp */
- update_packetheader(nut, bc, size);
-
- put_buffer(bc, buf, size);
-
- put_flush_packet(bc);
-
- return 0;
-}
-
-static int nut_write_trailer(AVFormatContext *s)
-{
- ByteIOContext *bc = &s->pb;
-#if 0
- int i;
-
- /* WRITE INDEX */
-
- for (i = 0; s->nb_streams; i++)
- {
- put_be64(bc, INDEX_STARTCODE);
- put_packetheader(nut, bc, 64);
- put_v(bc, s->streams[i]->id);
- put_v(bc, ...);
- put_be32(bc, 0); /* FIXME: checksum */
- update_packetheader(nut, bc, 0);
- }
-#endif
-
- put_flush_packet(bc);
-
- return 0;
-}
-
-static int nut_probe(AVProbeData *p)
-{
- int i;
- uint64_t code;
-
- code = 0xff;
- for (i = 0; i < p->buf_size; i++) {
- int c = p->buf[i];
- code = (code << 8) | c;
- if (code == MAIN_STARTCODE)
- return AVPROBE_SCORE_MAX;
- }
- return 0;
-}
-
-static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
-{
- NUTContext *nut = s->priv_data;
- ByteIOContext *bc = &s->pb;
- uint64_t tmp;
- int cur_stream, nb_streams;
-
- /* main header */
- tmp = get_be64(bc);
- if (tmp != MAIN_STARTCODE)
- fprintf(stderr, "damaged? startcode!=1 (%Ld)\n", tmp);
- get_packetheader(nut, bc);
-
- tmp = get_v(bc);
- if (tmp != 0)
- fprintf(stderr, "bad version (%Ld)\n", tmp);
-
- nb_streams = get_v(bc);
-
- s->file_size = get_v(bc);
- s->duration = get_v(bc) / (AV_TIME_BASE / 1000);
-
- get_be32(bc); /* checkusm */
-
- s->bit_rate = 0;
-
- /* stream header */
- for (cur_stream = 0; cur_stream < nb_streams; cur_stream++)
- {
- int class;
- AVStream *st;
-
- tmp = get_be64(bc);
- if (tmp != STREAM_STARTCODE)
- fprintf(stderr, "damaged? startcode!=1 (%Ld)\n", tmp);
- get_packetheader(nut, bc);
- st = av_new_stream(s, get_v(bc));
- if (!st)
- return AVERROR_NOMEM;
- class = get_v(bc);
- tmp = get_bi(bc);
- switch(class)
- {
- case 0:
- st->codec.codec_type = CODEC_TYPE_VIDEO;
- st->codec.codec_id = codec_get_bmp_id(tmp);
- if (st->codec.codec_id == CODEC_ID_NONE)
- fprintf(stderr, "Unknown codec?!\n");
- break;
- case 32:
- st->codec.codec_type = CODEC_TYPE_AUDIO;
- st->codec.codec_id = codec_get_wav_id(tmp);
- if (st->codec.codec_id == CODEC_ID_NONE)
- fprintf(stderr, "Unknown codec?!\n");
- break;
- default:
- fprintf(stderr, "Unknown stream class (%d)\n", class);
- return -1;
- }
- s->bit_rate += get_v(bc);
- get_b(bc, NULL, 0); /* language code */
- st->codec.frame_rate_base = get_v(bc);
- st->codec.frame_rate = get_v(bc);
- get_v(bc); /* FIXME: msb timestamp base */
- get_v(bc); /* shuffle type */
- get_byte(bc); /* flags */
-
- get_v(bc); /* FIXME: codec specific data headers */
-
- if (class == 0) /* VIDEO */
- {
- st->codec.width = get_v(bc);
- st->codec.height = get_v(bc);
- get_v(bc); /* aspected w */
- get_v(bc); /* aspected h */
- get_v(bc); /* csp type */
- get_be32(bc); /* checksum */
- }
- if (class == 32) /* AUDIO */
- {
- st->codec.sample_rate = get_v(bc) * (double)(st->codec.frame_rate_base / st->codec.frame_rate);
- st->codec.channels = get_v(bc);
- get_be32(bc); /* checksum */
- }
- }
-
- return 0;
-}
-
-static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
- NUTContext *nut = s->priv_data;
- ByteIOContext *bc = &s->pb;
- int id, timestamp, size;
- int key_frame = 0;
- uint64_t tmp;
-
-
- if (url_feof(bc))
- return -1;
-
- tmp = get_byte(bc);
- if (tmp & 0x80) /* zero bit set? */
- {
- tmp<<=8 ; tmp |= get_byte(bc);
- tmp<<=16; tmp |= get_be16(bc);
- tmp<<=32; tmp |= get_be32(bc);
- if (tmp == KEYFRAME_STARTCODE)
- {
- key_frame = 1;
- tmp = get_byte(bc); /* flags */
- }
- else
- fprintf(stderr, "error in zero bit / startcode %LX\n", tmp);
- }
- get_packetheader(nut, bc);
-#if 0
- if (((tmp & 0x60)>>5) > 3) /* priority <= 3 */
- fprintf(stderr, "sanity check failed!\n");
-#endif
- id = get_v(bc);
- timestamp = get_s(bc);
-
- size = (nut->curr_frame_size - (url_ftell(bc)-nut->curr_frame_start));
- dprintf("flags: 0x%Lx, timestamp: %d, packet size: %d\n", tmp, timestamp, size);
-
- if (size < 0)
- return -1;
-
- av_new_packet(pkt, size);
- get_buffer(bc, pkt->data, size);
- pkt->stream_index = id;
- if (key_frame)
- pkt->flags |= PKT_FLAG_KEY;
- pkt->pts = timestamp;
-
- return 0;
-}
-
-static AVInputFormat nut_iformat = {
- "nut",
- "nut format",
- sizeof(NUTContext),
- nut_probe,
- nut_read_header,
- nut_read_packet,
-// nut_read_close,
-// nut_read_seek,
- .extensions = "nut",
-};
-
-static AVOutputFormat nut_oformat = {
- "nut",
- "nut format",
- "video/x-nut",
- "nut",
- sizeof(NUTContext),
-#ifdef CONFIG_VORBIS
- CODEC_ID_VORBIS,
-#elif defined(CONFIG_MP3LAME)
- CODEC_ID_MP3,
-#else
- CODEC_ID_MP2, /* AC3 needs liba52 decoder */
-#endif
- CODEC_ID_MPEG4,
- nut_write_header,
- nut_write_packet,
- nut_write_trailer,
-};
-
-int nut_init(void)
-{
- av_register_input_format(&nut_iformat);
- av_register_output_format(&nut_oformat);
- return 0;
-}
projects / synfig.git / blobdiff