Add new function signatures needed for buffer allocation in Chrome.

chromium/avcodec-54.sigs

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # Functions from avcodec used in chromium code.
 
 AVCodecContext *avcodec_alloc_context(void);
 AVCodec *avcodec_find_decoder(enum CodecID id);
 AVFrame *avcodec_alloc_frame(void);
 int av_new_packet(AVPacket *pkt, int size);
 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples, int *frame_size_ptr, AVPacket *avpkt);
 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt);
 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
 int avcodec_close(AVCodecContext *avctx);
 void av_free_packet(AVPacket *pkt);
 void av_init_packet(AVPacket *pkt);
 int av_dup_packet(AVPacket *pkt);
 void avcodec_flush_buffers(AVCodecContext *avctx);
 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe);
 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
 void av_destruct_packet(AVPacket *pkt);
 int av_lockmgr_register(AVLockMgrOperation cb);
+int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);

[Ami GONE FROM CHROMIUM, 2012/05/28 18:30:01]

See my comments on the other CL; hopefully you can drop this and the next line
from this CL.

+void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
+void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
 
 # RDFT functions.
 RDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans);
 void av_rdft_calc(RDFTContext *s, FFTSample *data);
 void av_rdft_end(RDFTContext *s);