FFmpeg Summer Of Code 2009: Difference between revisions
Line 29: | Line 29: | ||
primary goals: | primary goals: | ||
* stream copy of ALS frames in MP4 files from reference encoder | * stream copy of ALS frames in MP4 files from reference encoder | ||
* detect codec_id | |||
* preserve extradata | |||
* write the decoder based on the ISO specification | * write the decoder based on the ISO specification | ||
* ISO/IEC 14496-3:2005/Amd.2:2006 and related corrigenda | |||
* decode files with basic ALS features | * decode files with basic ALS features | ||
* integer samples | |||
* LPC | |||
* rice coding | |||
* joint-stereo | |||
secondary goals: | secondary goals: | ||
* decode files with more advanced ALS features | * decode files with more advanced ALS features | ||
* floating-point samples | |||
* block switching | |||
* LTP (long term prediction) | |||
* BGMC (arithmetic coding) | |||
* MCC (advanced multi-channel) | |||
* RLSLMS (backward-adaptive prediction) | |||
* pass the ISO conformance tests | * pass the ISO conformance tests | ||
* handle anything the reference encoder can come up with | * handle anything the reference encoder can come up with |
Revision as of 11:01, 14 March 2009
Current Status
This list is still a work-in-progress, please see also the Talk Page.
Qualification tasks
For us to consider your application for SoC we require a completed qualification task. Choose a task from the Small Tasks list, send an email to FFmpeg-devel mailing list to inform that you are working on it (to avoid duplicated work) and when it is ready submit it for review at FFmpeg-devel. The task is considered completed when your patch is accepted to our main SVN tree.
1st Tier Project Proposals
1st tier project proposals are project ideas that are reasonably well defined AND have a mentor volunteered.
S/PDIF muxer
- Implement a muxer capable to mux:
- DTS, all 3 packing modes and the usable HD extensions
- AC3, eAC3 also
- MLP
- PCM
- WMApro
- AAC
- Mpeg-audio, layer 2 and 3
Mentor: Benjamin Larsson
Flash Screen video 2 codec
- Implement a flashsv2 decoder and encoder. And extend the current flashsv encoder to support optimal 2-pass encoding.
Mentor: Benjamin Larsson
MPEG-4 ALS decoder
primary goals:
- stream copy of ALS frames in MP4 files from reference encoder
* detect codec_id * preserve extradata
- write the decoder based on the ISO specification
* ISO/IEC 14496-3:2005/Amd.2:2006 and related corrigenda
- decode files with basic ALS features
* integer samples * LPC * rice coding * joint-stereo
secondary goals:
- decode files with more advanced ALS features
* floating-point samples * block switching * LTP (long term prediction) * BGMC (arithmetic coding) * MCC (advanced multi-channel) * RLSLMS (backward-adaptive prediction)
- pass the ISO conformance tests
- handle anything the reference encoder can come up with
Mentor: Justin Ruggles
2nd Tier Project Proposals
All that separates these proposals from their 1st tier brethren is a mentor.
Implement a better regressions test system
- Split up the current regtests
- Add tests for all the missing formats and codecs to FATE
libvo
- Port MPlayer's libvo to ffplay
- Note that this does not just mean to produce a working hack so that ffplay can use xv, but a clean and acceptable wrapper for (most of) libvo.
GStreamer input
- Like we have vfw input we could have a gstreamer input format also. This would enable support of wmapro and wmalossless until these formats are RE'd.
Mentor: Christian Schaller
AMR-WB Decoder
- Specification: http://www.3gpp.org/ftp/Specs/html-info/26-series.htm
- Samples: http://samples.mplayerhq.hu/A-codecs/amr/
Also see AMR.
GSM Decoder
- Specification + sample implementation: http://kbs.cs.tu-berlin.de/~jutta/toast.html
- Samples: http://samples.mplayerhq.hu/A-codecs/GSM/
Also see GSM.
Sipr Decoder
- Specification: will be provided
- Samples: http://samples.mplayerhq.hu/real/AC-sipr/
Also see RealAudio sipr and this patch.
Speex Decoder
- Specification: http://speex.org/docs/
- Samples: http://samples.mplayerhq.hu/A-codecs/speex/
Also see Speex.
AMR-NB Encoder
- Specification: http://www.3gpp.org/ftp/Specs/html-info/26-series.htm
- Samples: http://samples.mplayerhq.hu/A-codecs/amr/
Also see AMR.
VP6 Encoder
- Specification: On2 VP6
- Samples: http://samples.mplayerhq.hu/V-codecs/VP6/
WMV3 Encoder
- Clearly defined task
- Primary goal: Encode video sequences such that they can be decoded by a Windows Media player.
This could either be done by improving this patch or by writing the encoder from scratch.
Improve subtitle support
- Add text-to-bitmap conversion functions
- One with hard-coded bitmaps for characters
- One that utilizes freetype
- Function used will be chosen upon compilation
Adjust existing subtitle support to new ABI
AACS implementation
- Add the ability to encode and decode using Advanced Access Content System to FFmpeg.
VC-1 Interlaced Support
- Add support for interlaced streams as used in Bluray recordings to the VC-1 decoder.
- This includes fixing some reference streams
Improve Ratecontrol
- Primary goal 1: Fast heuristic VBV compliant per macroblock ratecontrol which has a better PSNR/bitrate and better subjective quality/bitrate than the current code.
- Primary goal 2: VBV compliant, rate distortion optimal per macroblock ratecontrol using the viterbi algorithm.
- Secondary goal 1: Fast heuristic scene change detection which detects scene changes more accurately, has better PSNR/bitrate and subjective quality/bitrate than the current heuristic.
- Secondary goal 2: Rate distortion optimal (for the current picture) scene change detection.
- Secondary goal 3: B frames decision which is faster and or has a higher PSNR/bitrate and subjective quality/bitrate than the current code.
WMA lossless
- Implement a decoder for WMA lossless (0x0163)
- Reuse as much libavcodec code as possible
- Samples: http://samples.mplayerhq.hu/A-codecs/WMA9/wma_0x163.wma http://samples.mplayerhq.hu/A-codecs/lossless/luckynight.wma