H264编解码，从ffmpeg库提取

/* * ffmpeg main * Copyright (c) 2000-2003 Fabrice Bellard * * 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 2.1 of the License, or (at your option) any later version. * * 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "config.h" #include <ctype.h> #include <string.h> #include <math.h> #include <stdlib.h> #include <errno.h> #include <signal.h> #include <limits.h> #include <unistd.h> #include "libavformat/avformat.h" #include "libavdevice/avdevice.h" #include "libswscale/swscale.h" #include "libavutil/opt.h" #include "libavcodec/audioconvert.h" #include "libavutil/audioconvert.h" #include "libavutil/parseutils.h" #include "libavutil/samplefmt.h" #include "libavutil/colorspace.h" #include "libavutil/fifo.h" #include "libavutil/intreadwrite.h" #include "libavutil/dict.h" #include "libavutil/pixdesc.h" #include "libavutil/avstring.h" #include "libavutil/libm.h" #include "libavformat/os_support.h" #include "libavformat/ffm.h" // not public API #if CONFIG_AVFILTER # include "libavfilter/avcodec.h" # include "libavfilter/avfilter.h" # include "libavfilter/avfiltergraph.h" # include "libavfilter/vsink_buffer.h" # include "libavfilter/vsrc_buffer.h" #endif #if HAVE_SYS_RESOURCE_H #include <sys/types.h> #include <sys/time.h> #include <sys/resource.h> #elif HAVE_GETPROCESSTIMES #include <windows.h> #endif #if HAVE_GETPROCESSMEMORYINFO #include <windows.h> #include <psapi.h> #endif #if HAVE_SYS_SELECT_H #include <sys/select.h> #endif #if HAVE_TERMIOS_H #include <fcntl.h> #include <sys/ioctl.h> #include <sys/time.h> #include <termios.h> #elif HAVE_KBHIT #include <conio.h> #endif #include <time.h> #include "cmdutils.h" #include "libavutil/avassert.h" const char program_name[] = "ffmpeg"; const int program_birth_year = 2000; /* select an input stream for an output stream */ typedef struct AVStreamMap { int file_index; int stream_index; int sync_file_index; int sync_stream_index; } AVStreamMap; /** * select an input file for an output file */ typedef struct AVMetaDataMap { int file; //< file index char type; //< type of metadata to copy -- (g)lobal, (s)tream, (c)hapter or (p)rogram int index; //< stream/chapter/program number } AVMetaDataMap; typedef struct AVChapterMap { int in_file; int out_file; } AVChapterMap; static const OptionDef options[]; #define MAX_FILES 100 #define MAX_STREAMS 1024 /* arbitrary sanity check value */ static const char *last_asked_format = NULL; static int64_t input_files_ts_offset[MAX_FILES]; static double *input_files_ts_scale[MAX_FILES] = {NULL}; static AVCodec **input_codecs = NULL; static int nb_input_codecs = 0; static int nb_input_files_ts_scale[MAX_FILES] = {0}; static AVFormatContext *output_files[MAX_FILES]; static int nb_output_files = 0; static AVStreamMap *stream_maps = NULL; static int nb_stream_maps; /* first item specifies output metadata, second is input */ static AVMetaDataMap (*meta_data_maps)[2] = NULL; static int nb_meta_data_maps; static int metadata_global_autocopy = 1; static int metadata_streams_autocopy = 1; static int metadata_chapters_autocopy = 1; static AVChapterMap *chapter_maps = NULL; static int nb_chapter_maps; /* indexed by output file stream index */ static int *streamid_map = NULL; static int nb_streamid_map = 0; static int frame_width = 0; static int frame_height = 0; static float frame_aspect_ratio = 0; static enum PixelFormat frame_pix_fmt = PIX_FMT_NONE; static int frame_bits_per_raw_sample = 0; static enum AVSampleFormat audio_sample_fmt = AV_SAMPLE_FMT_NONE; static int max_frames[4] = {INT_MAX, INT_MAX, INT_MAX, INT_MAX}; static AVRational frame_rate; static float video_qscale = 0; static uint16_t *intra_matrix = NULL; static uint16_t *inter_matrix = NULL; static const char *video_rc_override_string=NULL; static int video_disable = 0; static int video_discard = 0; static char *video_codec_name = NULL; static unsigned int video_codec_tag = 0; static char *video_language = NULL; static int same_quality = 0; static int do_deinterlace = 0; static int top_field_first = -1; static int me_threshold = 0; static int intra_dc_precision = 8; static int loop_input = 0; static int loop_output = AVFMT_NOOUTPUTLOOP; static int qp_hist = 0; #if CONFIG_AVFILTER static char *vfilters = NULL; #endif static int intra_only = 0; static int audio_sample_rate = 0; static int64_t channel_layout = 0; #define QSCALE_NONE -99999 static float audio_qscale = QSCALE_NONE; static int audio_disable = 0; static int audio_channels = 0; static char *audio_codec_name = NULL; static unsigned int audio_codec_tag = 0; static char *audio_language = NULL; static int subtitle_disable = 0; static char *subtitle_codec_name = NULL; static char *subtitle_language = NULL; static unsigned int subtitle_codec_tag = 0; static int data_disable = 0; static char *data_codec_name = NULL; static unsigned int data_codec_tag = 0; static float mux_preload= 0.5; static float mux_max_delay= 0.7; static int64_t recording_time = INT64_MAX; static int64_t start_time = 0; static int64_t recording_timestamp = 0; static int64_t input_ts_offset = 0; static int file_overwrite = 0; static AVDictionary *metadata; static int do_benchmark = 0; static int do_hex_dump = 0; static int do_pkt_dump = 0; static int do_psnr = 0; static int do_pass = 0; static const char *pass_logfilename_prefix; static int audio_stream_copy = 0; static int video_stream_copy = 0; static int subtitle_stream_copy = 0; static int data_stream_copy = 0; static int video_sync_method= -1; static int audio_sync_method= 0; static float audio_drift_threshold= 0.1; static int copy_ts= 0; static int copy_tb= 0; static int opt_shortest = 0; static char *vstats_filename; static FILE *vstats_file; static int opt_programid = 0; static int copy_initial_nonkeyframes = 0; static int rate_emu = 0; static int video_channel = 0; static char *video_standard; static int audio_volume = 256; static int exit_on_error = 0; static int using_stdin = 0; static int verbose = 1; static int run_as_daemon = 0; static int thread_count= 1; static int q_pressed = 0; static int64_t video_size = 0; static int64_t audio_size = 0; static int64_t extra_size = 0; static int nb_frames_dup = 0; static int nb_frames_drop = 0; static int input_sync; static uint64_t limit_filesize = 0; static int force_fps = 0; static char *forced_key_frames = NULL; static float dts_delta_threshold = 10; static int64_t timer_start; static uint8_t *audio_buf; static uint8_t *audio_out; static unsigned int allocated_audio_out_size, allocated_audio_buf_size; static short *samples; static AVBitStreamFilterContext *video_bitstream_filters=NULL; static AVBitStreamFilterContext *audio_bitstream_filters=NULL; static AVBitStreamFilterContext *subtitle_bitstream_filters=NULL; #define DEFAULT_PASS_LOGFILENAME_PREFIX "ffmpeg2pass" struct AVInputStream; typedef struct AVOutputStream { int file_index; /* file index */ int index; /* stream index in the output file */ int source_index; /* AVInputStream index */ AVStream *st; /* stream in the output file */ int encoding_needed; /* true if encoding needed for this stream */ int frame_number; /* input pts and corresponding output pts for A/V sync */ //double sync_ipts; /* dts from the AVPacket of the demuxer in second units */ stru