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Defines various common FLV format values between the FLV muxer and demuxer 

in a common flv.h.
patch by Allan Hsu  allan _at_ counterpop.net

Originally committed as revision 7231 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Allan Hsu Aurelien Jacobs 18 years ago
parent
e48dc873a4
commit
6cac3a3b08
3 changed files with 157 additions and 54 deletions
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  1. +108
    -0
      libavformat/flv.h
  2. +27
    -26
      libavformat/flvdec.c
  3. +22
    -28
      libavformat/flvenc.c

+ 108
- 0
libavformat/flv.h View File

@@ -0,0 +1,108 @@
/**
* @file flv.h
* FLV common header
*
* Copyright (c) 2006 The FFmpeg Project.
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef FLV_H
#define FLV_H

/* offsets for packed values */
#define FLV_AUDIO_SAMPLESSIZE_OFFSET 1
#define FLV_AUDIO_SAMPLERATE_OFFSET 2
#define FLV_AUDIO_CODECID_OFFSET 4

#define FLV_VIDEO_FRAMETYPE_OFFSET 4

/* bitmasks to isolate specific values */
#define FLV_AUDIO_CHANNEL_MASK 0x01
#define FLV_AUDIO_SAMPLESIZE_MASK 0x02
#define FLV_AUDIO_SAMPLERATE_MASK 0x0c
#define FLV_AUDIO_CODECID_MASK 0xf0

#define FLV_VIDEO_CODECID_MASK 0x0f
#define FLV_VIDEO_FRAMETYPE_MASK 0xf0

#define AMF_END_OF_OBJECT 0x09

enum {
FLV_HEADER_FLAG_HASVIDEO = 1,
FLV_HEADER_FLAG_HASAUDIO = 4,
};

enum {
FLV_TAG_TYPE_AUDIO = 0x08,
FLV_TAG_TYPE_VIDEO = 0x09,
FLV_TAG_TYPE_META = 0x12,
};

enum {
FLV_MONO = 0,
FLV_STEREO = 1,
};

enum {
FLV_SAMPLESSIZE_8BIT = 0,
FLV_SAMPLESSIZE_16BIT = 1 << FLV_AUDIO_SAMPLESSIZE_OFFSET,
};

enum {
FLV_SAMPLERATE_SPECIAL = 0, /**< signifies 5512Hz and 8000Hz in the case of NELLYMOSER */
FLV_SAMPLERATE_11025HZ = 1 << FLV_AUDIO_SAMPLERATE_OFFSET,
FLV_SAMPLERATE_22050HZ = 2 << FLV_AUDIO_SAMPLERATE_OFFSET,
FLV_SAMPLERATE_44100HZ = 3 << FLV_AUDIO_SAMPLERATE_OFFSET,
};

enum {
FLV_CODECID_PCM_BE = 0,
FLV_CODECID_ADPCM = 1 << FLV_AUDIO_CODECID_OFFSET,
FLV_CODECID_MP3 = 2 << FLV_AUDIO_CODECID_OFFSET,
FLV_CODECID_PCM_LE = 3 << FLV_AUDIO_CODECID_OFFSET,
FLV_CODECID_NELLYMOSER_8HZ_MONO = 5 << FLV_AUDIO_CODECID_OFFSET,
FLV_CODECID_NELLYMOSER = 6 << FLV_AUDIO_CODECID_OFFSET,
};

enum {
FLV_CODECID_H263 = 2,
FLV_CODECID_SCREEN = 3,
FLV_CODECID_VP6 = 4,
};

enum {
FLV_FRAME_KEY = 1 << FLV_VIDEO_FRAMETYPE_OFFSET,
FLV_FRAME_INTER = 2 << FLV_VIDEO_FRAMETYPE_OFFSET,
FLV_FRAME_DISP_INTER = 3 << FLV_VIDEO_FRAMETYPE_OFFSET,
};

typedef enum {
AMF_DATA_TYPE_NUMBER = 0x00,
AMF_DATA_TYPE_BOOL = 0x01,
AMF_DATA_TYPE_STRING = 0x02,
AMF_DATA_TYPE_OBJECT = 0x03,
AMF_DATA_TYPE_NULL = 0x05,
AMF_DATA_TYPE_UNDEFINED = 0x06,
AMF_DATA_TYPE_REFERENCE = 0x07,
AMF_DATA_TYPE_MIXEDARRAY = 0x08,
AMF_DATA_TYPE_ARRAY = 0x0a,
AMF_DATA_TYPE_DATE = 0x0b,
AMF_DATA_TYPE_UNSUPPORTED = 0x0d,
} AMFDataType;

#endif /* FLV_H */

+ 27
- 26
libavformat/flvdec.c View File

@@ -25,6 +25,7 @@
* - lower 4bits: difference between encoded height and visible height
*/
#include "avformat.h"
#include "flv.h"

static int flv_probe(AVProbeData *p)
{
@@ -90,13 +91,13 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)

next= size + url_ftell(&s->pb);

if (type == 8) {
if (type == FLV_TAG_TYPE_AUDIO) {
is_audio=1;
flags = get_byte(&s->pb);
} else if (type == 9) {
} else if (type == FLV_TAG_TYPE_VIDEO) {
is_audio=0;
flags = get_byte(&s->pb);
} else if (type == 18 && size > 13+1+4) {
} else if (type == FLV_TAG_TYPE_META && size > 13+1+4) {
url_fskip(&s->pb, 13); //onMetaData blah
if(get_byte(&s->pb) == 8){
url_fskip(&s->pb, 4);
@@ -113,17 +114,17 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
tmp[len]=0;

type= get_byte(&s->pb);
if(type==0){
if(type == AMF_DATA_TYPE_NUMBER){
d= av_int2dbl(get_be64(&s->pb));
}else if(type==2){
}else if(type == AMF_DATA_TYPE_STRING){
len= get_be16(&s->pb);
if(len >= sizeof(tmp))
break;
url_fskip(&s->pb, len);
}else if(type==8){
}else if(type == AMF_DATA_TYPE_MIXEDARRAY){
//array
break;
}else if(type==11){
}else if(type == AMF_DATA_TYPE_DATE){
d= av_int2dbl(get_be64(&s->pb));
get_be16(&s->pb);
}
@@ -158,14 +159,14 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
st->codec->time_base= (AVRational){1,1000};
}
// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
if( (st->discard >= AVDISCARD_NONKEY && !((flags >> 4)==1 || is_audio))
||(st->discard >= AVDISCARD_BIDIR && ((flags >> 4)==3 && !is_audio))
if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
|| st->discard >= AVDISCARD_ALL
){
url_fseek(&s->pb, next, SEEK_SET);
continue;
}
if ((flags >> 4)==1)
if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
break;
}
@@ -173,31 +174,31 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
if(is_audio){
if(st->codec->sample_rate == 0){
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->channels = (flags&1)+1;
if((flags >> 4) == 5)
st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
st->codec->sample_rate= 8000;
else
st->codec->sample_rate = (44100<<((flags>>2)&3))>>3;
switch(flags >> 4){/* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
case 0: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16BE;
st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
switch(flags & FLV_AUDIO_CODECID_MASK) {
case FLV_CODECID_PCM_BE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16BE;
else st->codec->codec_id = CODEC_ID_PCM_S8; break;
case 1: st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
case 2: st->codec->codec_id = CODEC_ID_MP3; st->need_parsing = 1; break;
case FLV_CODECID_ADPCM : st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
case FLV_CODECID_MP3 : st->codec->codec_id = CODEC_ID_MP3 ; st->need_parsing = 1; break;
// this is not listed at FLV but at SWF, strange...
case 3: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16LE;
case FLV_CODECID_PCM_LE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16LE;
else st->codec->codec_id = CODEC_ID_PCM_S8; break;
default:
av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
st->codec->codec_tag= (flags >> 4);
}
st->codec->bits_per_sample = (flags & 2) ? 16 : 8;
st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
}
}else{
st->codec->codec_type = CODEC_TYPE_VIDEO;
switch(flags & 0xF){
case 2: st->codec->codec_id = CODEC_ID_FLV1; break;
case 3: st->codec->codec_id = CODEC_ID_FLASHSV; break;
case 4:
switch(flags & FLV_VIDEO_CODECID_MASK){
case FLV_CODECID_H263 : st->codec->codec_id = CODEC_ID_FLV1 ; break;
case FLV_CODECID_SCREEN: st->codec->codec_id = CODEC_ID_FLASHSV; break;
case FLV_CODECID_VP6 :
st->codec->codec_id = CODEC_ID_VP6F;
if (st->codec->extradata_size != 1) {
st->codec->extradata_size = 1;
@@ -208,8 +209,8 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
size--;
break;
default:
av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & 0xf);
st->codec->codec_tag= flags & 0xF;
av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & FLV_VIDEO_CODECID_MASK);
st->codec->codec_tag = flags & FLV_VIDEO_CODECID_MASK;
}
}

@@ -223,7 +224,7 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
pkt->pts = pts;
pkt->stream_index = st->index;

if (is_audio || ((flags >> 4)==1))
if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
pkt->flags |= PKT_FLAG_KEY;

return ret;


+ 22
- 28
libavformat/flvenc.c View File

@@ -19,6 +19,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "flv.h"

#undef NDEBUG
#include <assert.h>
@@ -33,21 +34,21 @@ typedef struct FLVContext {
} FLVContext;

static int get_audio_flags(AVCodecContext *enc){
int flags = (enc->bits_per_sample == 16) ? 0x2 : 0x0;
int flags = (enc->bits_per_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;

switch (enc->sample_rate) {
case 44100:
flags |= 0x0C;
flags |= FLV_SAMPLERATE_44100HZ;
break;
case 22050:
flags |= 0x08;
flags |= FLV_SAMPLERATE_22050HZ;
break;
case 11025:
flags |= 0x04;
flags |= FLV_SAMPLERATE_11025HZ;
break;
case 8000: //nellymoser only
case 5512: //not mp3
flags |= 0x00;
flags |= FLV_SAMPLERATE_SPECIAL;
break;
default:
av_log(enc, AV_LOG_ERROR, "flv doesnt support that sample rate, choose from (44100, 22050, 11025)\n");
@@ -55,23 +56,24 @@ static int get_audio_flags(AVCodecContext *enc){
}

if (enc->channels > 1) {
flags |= 0x01;
flags |= FLV_STEREO;
}

switch(enc->codec_id){
case CODEC_ID_MP3:
flags |= 0x20 | 0x2;
flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
break;
case CODEC_ID_PCM_S8:
flags |= FLV_CODECID_PCM_BE | FLV_SAMPLESSIZE_8BIT;
break;
case CODEC_ID_PCM_S16BE:
flags |= 0x2;
flags |= FLV_CODECID_PCM_BE | FLV_SAMPLESSIZE_16BIT;
break;
case CODEC_ID_PCM_S16LE:
flags |= 0x30 | 0x2;
flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
break;
case CODEC_ID_ADPCM_SWF:
flags |= 0x10;
flags |= FLV_CODECID_ADPCM;
break;
case 0:
flags |= enc->codec_tag<<4;
@@ -84,14 +86,6 @@ static int get_audio_flags(AVCodecContext *enc){
return flags;
}

#define AMF_DOUBLE 0
#define AMF_BOOLEAN 1
#define AMF_STRING 2
#define AMF_OBJECT 3
#define AMF_MIXED_ARRAY 8
#define AMF_ARRAY 10
#define AMF_DATE 11

static void put_amf_string(ByteIOContext *pb, const char *str)
{
size_t len = strlen(str);
@@ -101,7 +95,7 @@ static void put_amf_string(ByteIOContext *pb, const char *str)

static void put_amf_double(ByteIOContext *pb, double d)
{
put_byte(pb, AMF_DOUBLE);
put_byte(pb, AMF_DATA_TYPE_NUMBER);
put_be64(pb, av_dbl2int(d));
}

@@ -160,11 +154,11 @@ static int flv_write_header(AVFormatContext *s)
/* now data of data_size size */

/* first event name as a string */
put_byte(pb, AMF_STRING); // 1 byte
put_byte(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, "onMetaData"); // 12 bytes

/* mixed array (hash) with size and string/type/data tuples */
put_byte(pb, AMF_MIXED_ARRAY);
put_byte(pb, AMF_DATA_TYPE_MIXEDARRAY);
put_be32(pb, 4*flv->hasVideo + flv->hasAudio + 2); // +2 for duration and file size

put_amf_string(pb, "duration");
@@ -195,7 +189,7 @@ static int flv_write_header(AVFormatContext *s)
put_amf_double(pb, 0); // delayed write

put_amf_string(pb, "");
put_byte(pb, 9); // end marker 1 byte
put_byte(pb, AMF_END_OF_OBJECT);

/* write total size of tag */
data_size= url_ftell(pb) - metadata_size_pos - 10;
@@ -216,8 +210,8 @@ static int flv_write_trailer(AVFormatContext *s)
FLVContext *flv = s->priv_data;

file_size = url_ftell(pb);
flags |= flv->hasAudio ? 4 : 0;
flags |= flv->hasVideo ? 1 : 0;
flags |= flv->hasAudio ? FLV_HEADER_FLAG_HASAUDIO : 0;
flags |= flv->hasVideo ? FLV_HEADER_FLAG_HASVIDEO : 0;
url_fseek(pb, 4, SEEK_SET);
put_byte(pb,flags);

@@ -242,16 +236,16 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
// av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);

if (enc->codec_type == CODEC_TYPE_VIDEO) {
put_byte(pb, 9);
flags = 2; // choose h263
flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator
put_byte(pb, FLV_TAG_TYPE_VIDEO);
flags = FLV_CODECID_H263;
flags |= pkt->flags & PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
} else {
assert(enc->codec_type == CODEC_TYPE_AUDIO);
flags = get_audio_flags(enc);

assert(size);

put_byte(pb, 8);
put_byte(pb, FLV_TAG_TYPE_AUDIO);
}

put_be24(pb,size+1); // include flags


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