/*
- * FLV encoder.
+ * FLV demuxer
* Copyright (c) 2003 The FFmpeg Project.
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ *
+ * This demuxer will generate a 1 byte extradata for VP6F content.
+ * It is composed of:
+ * - upper 4bits: difference between encoded width and visible width
+ * - lower 4bits: difference between encoded height and visible height
*/
#include "avformat.h"
-
-unsigned int get_be24(ByteIOContext *s)
-{
- unsigned int val;
- val = get_byte(s) << 16;
- val |= get_byte(s) << 8;
- val |= get_byte(s);
- return val;
-}
+#include "flv.h"
static int flv_probe(AVProbeData *p)
{
return 0;
}
+static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
+ AVCodecContext *acodec = astream->codec;
+ switch(flv_codecid) {
+ //no distinction between S16 and S8 PCM codec flags
+ case FLV_CODECID_PCM_BE:
+ acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16BE; break;
+ case FLV_CODECID_PCM_LE:
+ acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
+ case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
+ case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = 1 ; break;
+ case FLV_CODECID_NELLYMOSER_8HZ_MONO:
+ acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
+ case FLV_CODECID_NELLYMOSER:
+ default:
+ av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
+ acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
+ }
+}
+
+static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
+ AVCodecContext *vcodec = vstream->codec;
+ switch(flv_codecid) {
+ case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
+ case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
+ case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
+ if(vcodec->extradata_size != 1) {
+ vcodec->extradata_size = 1;
+ vcodec->extradata = av_malloc(1);
+ }
+ vcodec->extradata[0] = get_byte(&s->pb);
+ return 1; // 1 byte body size adjustment for flv_read_packet()
+ default:
+ av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
+ vcodec->codec_tag = flv_codecid;
+ }
+
+ return 0;
+}
+
+static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
+ int length = get_be16(ioc);
+ if(length >= buffsize) {
+ url_fskip(ioc, length);
+ return -1;
+ }
+
+ get_buffer(ioc, buffer, length);
+
+ buffer[length] = '\0';
+
+ return length;
+}
+
+static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, unsigned int max_pos, int depth) {
+ AVCodecContext *acodec, *vcodec;
+ ByteIOContext *ioc;
+ AMFDataType amf_type;
+ char str_val[256];
+ double num_val;
+
+ num_val = 0;
+ ioc = &s->pb;
+
+ amf_type = get_byte(ioc);
+
+ switch(amf_type) {
+ case AMF_DATA_TYPE_NUMBER:
+ num_val = av_int2dbl(get_be64(ioc)); break;
+ case AMF_DATA_TYPE_BOOL:
+ num_val = get_byte(ioc); break;
+ case AMF_DATA_TYPE_STRING:
+ if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
+ return -1;
+ break;
+ case AMF_DATA_TYPE_OBJECT: {
+ unsigned int keylen;
+
+ while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
+ url_fskip(ioc, keylen); //skip key string
+ if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
+ return -1; //if we couldn't skip, bomb out.
+ }
+ if(get_byte(ioc) != AMF_END_OF_OBJECT)
+ return -1;
+ }
+ break;
+ case AMF_DATA_TYPE_NULL:
+ case AMF_DATA_TYPE_UNDEFINED:
+ case AMF_DATA_TYPE_UNSUPPORTED:
+ break; //these take up no additional space
+ case AMF_DATA_TYPE_MIXEDARRAY:
+ url_fskip(ioc, 4); //skip 32-bit max array index
+ while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
+ //this is the only case in which we would want a nested parse to not skip over the object
+ if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
+ return -1;
+ }
+ if(get_byte(ioc) != AMF_END_OF_OBJECT)
+ return -1;
+ break;
+ case AMF_DATA_TYPE_ARRAY: {
+ unsigned int arraylen, i;
+
+ arraylen = get_be32(ioc);
+ for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
+ if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
+ return -1; //if we couldn't skip, bomb out.
+ }
+ }
+ break;
+ case AMF_DATA_TYPE_DATE:
+ url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
+ break;
+ default: //unsupported type, we couldn't skip
+ return -1;
+ }
+
+ if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
+ acodec = astream ? astream->codec : NULL;
+ vcodec = vstream ? vstream->codec : NULL;
+
+ if(amf_type == AMF_DATA_TYPE_BOOL) {
+ if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1;
+ } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
+ if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
+ else if(!strcmp(key, "width") && vcodec && num_val > 0) vcodec->width = num_val;
+ else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val;
+ else if(!strcmp(key, "audiocodecid") && acodec) flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
+ else if(!strcmp(key, "videocodecid") && vcodec) flv_set_video_codec(s, vstream, (int)num_val);
+ else if(!strcmp(key, "audiosamplesize") && acodec && num_val >= 0) {
+ acodec->bits_per_sample = num_val;
+ //we may have to rewrite a previously read codecid because FLV only marks PCM endianness.
+ if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE))
+ acodec->codec_id = CODEC_ID_PCM_S8;
+ }
+ else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) {
+ //some tools, like FLVTool2, write consistently approximate metadata sample rates
+ switch((int)num_val) {
+ case 44000: acodec->sample_rate = 44100 ; break;
+ case 22000: acodec->sample_rate = 22050 ; break;
+ case 11000: acodec->sample_rate = 11025 ; break;
+ case 5000 : acodec->sample_rate = 5512 ; break;
+ default : acodec->sample_rate = num_val;
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int flv_read_metabody(AVFormatContext *s, unsigned int next_pos) {
+ AMFDataType type;
+ AVStream *stream, *astream, *vstream;
+ ByteIOContext *ioc;
+ int i, keylen;
+ char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
+
+ astream = NULL;
+ vstream = NULL;
+ keylen = 0;
+ ioc = &s->pb;
+
+ //first object needs to be "onMetaData" string
+ type = get_byte(ioc);
+ if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
+ return -1;
+
+ //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
+ for(i = 0; i < s->nb_streams; i++) {
+ stream = s->streams[i];
+ if (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
+ else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
+ }
+
+ //parse the second object (we want a mixed array)
+ if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
+ return -1;
+
+ return 0;
+}
+
static int flv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
int offset, flags;
AVStream *st;
-
- s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ...
url_fskip(&s->pb, 4);
flags = get_byte(&s->pb);
+ if(flags & FLV_HEADER_FLAG_HASVIDEO){
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+ st->codec->codec_type = CODEC_TYPE_VIDEO;
+ av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
+ }
+ if(flags & FLV_HEADER_FLAG_HASAUDIO){
+ st = av_new_stream(s, 1);
+ if (!st)
+ return AVERROR_NOMEM;
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+ av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
+ }
+
offset = get_be32(&s->pb);
url_fseek(&s->pb, offset, SEEK_SET);
+ s->start_time = 0;
+
return 0;
}
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
- int ret, i, type, size, pts, flags, is_audio;
- AVStream *st;
-
+ int ret, i, type, size, pts, flags, is_audio, next, pos;
+ AVStream *st = NULL;
+
for(;;){
+ pos = url_ftell(&s->pb);
url_fskip(&s->pb, 4); /* size of previous packet */
type = get_byte(&s->pb);
size = get_be24(&s->pb);
return AVERROR_IO;
url_fskip(&s->pb, 4); /* reserved */
flags = 0;
-
+
if(size == 0)
continue;
-
- if (type == 8) {
+
+ next= size + url_ftell(&s->pb);
+
+ if (type == FLV_TAG_TYPE_AUDIO) {
is_audio=1;
flags = get_byte(&s->pb);
- size--;
- } else if (type == 9) {
+ } else if (type == FLV_TAG_TYPE_VIDEO) {
is_audio=0;
flags = get_byte(&s->pb);
- size--;
} else {
- /* skip packet */
- av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
- url_fskip(&s->pb, size);
+ if (type == FLV_TAG_TYPE_META && size > 13+1+4)
+ flv_read_metabody(s, next);
+ else /* skip packet */
+ av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
+ url_fseek(&s->pb, next, SEEK_SET);
continue;
}
break;
}
if(i == s->nb_streams){
- st = av_new_stream(s, is_audio);
- if (!st)
- return AVERROR_NOMEM;
-
- av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
- st->codec.frame_rate_base= 0;
+ av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
+ url_fseek(&s->pb, next, SEEK_SET);
+ continue;
+ }
+// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
+ 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 & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
+ av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
break;
}
+ // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
+ if(!url_is_streamed(&s->pb) && s->duration==AV_NOPTS_VALUE){
+ int size;
+ const int pos= url_ftell(&s->pb);
+ const int fsize= url_fsize(&s->pb);
+ url_fseek(&s->pb, fsize-4, SEEK_SET);
+ size= get_be32(&s->pb);
+ url_fseek(&s->pb, fsize-3-size, SEEK_SET);
+ if(size == get_be24(&s->pb) + 11){
+ s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
+ }
+ url_fseek(&s->pb, pos, SEEK_SET);
+ }
+
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.sample_rate= 8000;
+ if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
+ 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 2: st->codec.codec_id = CODEC_ID_MP3; break;
- default:
- st->codec.codec_tag= (flags >> 4);
- }
+ st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
+ st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
+ flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
}
}else{
- if(st->codec.frame_rate_base == 0){
- st->codec.codec_type = CODEC_TYPE_VIDEO;
- //guess the frame rate
- if(pts){
- st->codec.frame_rate_base=1;
- st->codec.frame_rate= (1000 + pts/2)/pts;
- }
- switch(flags & 0xF){
- case 2: st->codec.codec_id = CODEC_ID_FLV1; break;
- default:
- st->codec.codec_tag= flags & 0xF;
- }
- }
+ size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
}
- if (av_new_packet(pkt, size) < 0)
- return AVERROR_IO;
-
- ret = get_buffer(&s->pb, pkt->data, size);
+ ret= av_get_packet(&s->pb, pkt, size - 1);
if (ret <= 0) {
- av_free_packet(pkt);
return AVERROR_IO;
}
/* note: we need to modify the packet size here to handle the last
pkt->size = ret;
pkt->pts = pts;
pkt->stream_index = st->index;
-
- if (!is_audio && ((flags >> 4)==1))
- pkt->flags |= PKT_FLAG_KEY;
-
+
+ if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
+ pkt->flags |= PKT_FLAG_KEY;
+
return ret;
}
return 0;
}
-AVInputFormat flv_iformat = {
+static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+ AVStream *st = s->streams[stream_index];
+ int index = av_index_search_timestamp(st, timestamp, flags);
+ if (index < 0)
+ return -1;
+ url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
+
+ return 0;
+}
+
+AVInputFormat flv_demuxer = {
"flv",
"flv format",
0,
flv_read_header,
flv_read_packet,
flv_read_close,
+ flv_read_seek,
.extensions = "flv",
.value = CODEC_ID_FLV1,
};
-
-int flvdec_init(void)
-{
- av_register_input_format(&flv_iformat);
- return 0;
-}
projects / ffmpeg / blobdiff