Chiebot-Mirror/FFmpeg - FFmpeg - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Omer Osman	b01a2204b5	libfdk-aacdec: Enable Decoder Downmix including Downmix Metadata Support The FDK decoder is capable of producing mono and stereo downmix from multichannel streams. These streams may contain metadata that control the downmix process. The decoder requires an Ancillary Buffer in order to correctly apply downmix in streams containing downmix Metadata. The decoder does not have an API interface to inform of the presence of Metadata in the stream, and therefore the Ancillary Buffer is always allocated whenever a downmix is requested. When downmixing multichannel streams, the decoder requires the output buffer in aacDecoder_DecodeFrame call to be of fixed size in order to hold the actual number of channels contained in the stream. For example, for a 5.1ch to stereo downmix, the decoder requires that the output buffer is allocated for 6 channels, regardless of the fact that the output is in fact two channels. Due to this requirement, the output buffer is allocated for the maximum output buffer size in case a downmix is requested (and also during decoder init). When a downmix is requested, the buffer used for output during init will also be used for the entire duration the decoder is open. Otherwise, the initial decoder output buffer is freed and the decoder decodes straight into the output AVFrame. Signed-off-by: Martin Storsjö <martin@martin.st>	10 years ago
Omer Osman	1e9a93bfca	libfdk-aacdec: Decode the first AAC frame to reliably identify the bitstream For implicit signaling cases (as possible for Spectral Band Replication and Parametric Stereo Tools), the decoder must decode the first frame to correctly identify the stream configuration (as called from avformat_find_stream_info). The mechanism for this is built-in and only requires adding CODEC_CAP_CHANNEL_CONF to the libfdk-aacdec AVCodec struct. Signed-off-by: Omer Osman <omer.osman@iis.fraunhofer.de> Signed-off-by: Martin Storsjö <martin@martin.st>	11 years ago
Omer Osman	e0bfe34ea8	libfdk-aacdec: Reduce the default decoder delay by one frame The default error concealment method if none is set via aacDecoder_SetParam(AAC_CONCEAL_METHOD) is set in CConcealment_InitCommonData within the fdk-aac library and is set to Energy Interpolation. This method requires one frame delay to the output. To reduce the default decoder output delay and avoid missing the last frame in file based decoding, use Noise Substitution as the default concealment method. Signed-off-by: Omer Osman <omer.osman@iis.fraunhofer.de> Signed-off-by: Martin Storsjö <martin@martin.st>	11 years ago
Martin Storsjö	2f7065190a	libfdk-aac: Relicense the library wrappers to the ISC license This reduces the number of different licenses used within libav, and is preferrable since it has less ambiguous wordings than the BSD license with respect to the duties of the user of the code. Fraunhofer have now indicated that they're allowed to contribute code under this license as well. Signed-off-by: Martin Storsjö <martin@martin.st>	11 years ago
Martin Storsjö	3828eb8519	libfdk-aac: Relicense the library wrappers to 2-clause BSD This should make it possible for Fraunhofer to contribute to these wrappers - they didn't want to contribute to code under LGPL2.1 with the "or any later version" clause (which allowed using the code under the LGPL3 license). Signed-off-by: Martin Storsjö <martin@martin.st>	11 years ago
Diego Biurrun	84784c297f	libfdk-aacdec: formatting cosmetics	11 years ago
Martin Storsjö	4f2b469da5	Add a libfdk-aac decoder This can be useful for decoding AAC object types that are not supported by the native AAC decoder, e.g. AAC-LD and AAC-ELD.	11 years ago