[gst-devel] MPEG-2 TS Muxing
Kshitij Gupta
gupta.kshi at gmail.com
Thu Mar 26 07:46:25 CET 2009
Hi,
I was able to solve the problem in the follwing way. The aac
encoder must produce an adts output stream for this way to work,
1. Modify the mpegtsmux_aac.c to not insert adts header on it's own
GstBuffer * flutsmux_prepare_aac (GstBuffer * buf, FluTsPadData * data,
FluTsMux * mux)
{
//guint8 * adts_header = g_malloc0 (7);
//GstBuffer * out_buf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) + 7);
GstBuffer * out_buf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf));
gsize out_offset = 0;
guint8 rate_idx = 0, channels = 0, obj_type = 0;
GST_DEBUG_OBJECT (mux, "Preparing AAC buffer for output");
/* We want the same metadata */
gst_buffer_copy_metadata (out_buf, buf, GST_BUFFER_COPY_ALL);
#if 0
/* Generate ADTS header */
obj_type = (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data)) & 0xC) >> 2;
obj_type++;
rate_idx = (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data)) & 0x3) << 1;
rate_idx |=
(GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + 1) & 0x80) >> 7;
channels =
(GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + 1) & 0x78) >> 3;
GST_DEBUG_OBJECT (mux, "Rate index %u, channels %u, object type %u", rate_idx,
channels, obj_type);
/* Sync point over a full byte */
adts_header[0] = 0xFF;
/* Sync point continued over first 4 bits + static 4 bits
* (ID, layer, protection)*/
adts_header[1] = 0xF1;
/* Object type over first 2 bits */
adts_header[2] = obj_type << 6;
/* rate index over next 4 bits */
adts_header[2] |= (rate_idx << 2);
/* channels over last 2 bits */
adts_header[2] |= (channels & 0x4) >> 2;
/* channels continued over next 2 bits + 4 bits at zero */
adts_header[3] = (channels & 0x3) << 6;
/* frame size over last 2 bits */
adts_header[3] |= (GST_BUFFER_SIZE (out_buf) & 0x1800) >> 11;
/* frame size continued over full byte */
adts_header[4] = (GST_BUFFER_SIZE (out_buf) & 0x1FF8) >> 3;
/* frame size continued first 3 bits */
adts_header[5] = (GST_BUFFER_SIZE (out_buf) & 0x7) << 5;
/* buffer fullness (0x7FF for VBR) over 5 last bits*/
adts_header[5] |= 0x1F;
/* buffer fullness (0x7FF for VBR) continued over 6 first bits + 2 zeros for
* number of raw data blocks */
adts_header[6] = 0xFC;
/* Insert ADTS header */
memcpy (GST_BUFFER_DATA (out_buf) + out_offset, adts_header, 7);
g_free (adts_header);
out_offset += 7;
#endif
/* Now copy complete frame */
//memcpy (GST_BUFFER_DATA (out_buf) + out_offset, GST_BUFFER_DATA
(buf), GST_BUFFER_SIZE (buf));
memcpy (GST_BUFFER_DATA (out_buf) , GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
return out_buf;
}
The above code snippet is from flumpegtsmux_aac.c which is exactly
same as mpegtsmux_aac.c except the variable names etc.
regards
Kshitij
On Fri, Mar 20, 2009 at 8:54 AM, yangsb <yangsb05 at gmail.com> wrote:
>
> I meet the same problem as you.
> Also , I tried the tsmuxer in gst-plugin-bad-0.10.9 ,but still no audio.
> Hope to get some advice.
> Thanks
> Best regards.
>
>
> Kshitij Gupta-2 wrote:
>>
>> Hi,
>> I am trying a similar gst pipeline to transcode a file in mp2ts file
>> format with h264 and aac as codecs. Using the following pipeline
>>
>> gst-launch -v filesrc location=/home/kgupta/testflv/limca.flv ! decodebin
>> name=d ! queue ! videorate ! ffmpegcolorspace ! videoscale !
>> video/x-raw-yuv,height=144,width=176,framerate=\(fraction\)15/1 !
>> ffenc_h264
>> ! flutsmux name=mux ! filesink location=limca_aac_h264_faacadts.ts d. !
>> queue ! audioconvert ! audioresample ! audio/x-raw-int, endianness=1234,
>> signed=\(boolean\)true, width=\(int\)16, depth=\(int\)16,
>> rate=\(int\)16000,channels=\(int\)1 ! faac bitrate=16000 ! mux.
>>
>> Now I am trying to play this file with vlc. The video plays good but no
>> audio. Are there some obvious mistakes in my approach ??
>>
>> I am using the following versions
>> gst-fluendo-mpegmux-0.10.4
>> libtsmux-0.3.0
>>
>> Thanx
>> Kshitij
>>
>> On Fri, May 30, 2008 at 2:34 PM, Peter Maersk-Moller <
>> peter at maersk-moller.net> wrote:
>>
>>> Just a little remark for others wanting to test or hack. This command
>>> will get you the lot.
>>>
>>> svn co https://core.fluendo.com/gstreamer/svn/trunk
>>>
>>> Thanks
>>>
>>> Peter Maersk-Moller
>>>
>>> Julien Moutte wrote:
>>> > Fluendo has a MPEG TS muxer. We recently introduced support M2TS 192.
>>> > https://core.fluendo.com/gstreamer/svn/trunk/gst-fluendo-mpegmux/
>>> >
>>> > Best regards,
>>> >
>>> > Julien Moutte,
>>> > FLUENDO S.A.
>>> >
>>> > Peter Maersk-Moller wrote:
>>> >> Hi
>>> >>
>>> >> Trying to see if I can get gstreamer to encode a a/v source into a
>>> >> H.264/aac MPEG-2 TS stream. A/V encoding seems to work well, but the
>>> TS
>>> >> encoding part seems not to be supported.
>>> >>
>>> >> I'm looking into copy some code from VLC to create a TS mux plugin,
>>> but
>>> >> would like to ask first, if anyone else is working on something like
>>> >> that ? As I see it, we need to convert the two ES streams into to PES
>>> >> packet stream into a TS packet stream, which then could use either a
>>> UDP
>>> >> output plugin, a http server plugin (when finished) or a RTSP server
>>> >> plugin (if planned). So ES in PES in TS is needed. ES in PES in TS in
>>> >> RTP seems not to be widely used, so thsi is skipped.
>>> >>
>>> >> However, we would also need to create PAT and PMT to make the stream
>>> >> useful for many applications (such as Set Top Boxes not quite as
>>> clever
>>> >> as Mplayer).
>>> >>
>>> >> Best regards
>>> >>
>>> >> Peter Maersk-Moller
>>> >>
>>> >>
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