ffmpeg编译使用实例

/* * 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 */ /** * @file * multimedia converter based on the FFmpeg libraries */ #include "config.h" #include <ctype.h> #include <string.h> #include <math.h> #include <stdlib.h> #include <errno.h> #include <limits.h> #include <stdint.h> #include <stdarg.h> #if HAVE_ISATTY #if HAVE_IO_H #include <io.h> #endif #if HAVE_UNISTD_H #include <unistd.h> #endif #endif #include "libavformat/avformat.h" #include "libavdevice/avdevice.h" #include "libswresample/swresample.h" #include "libavutil/opt.h" #include "libavutil/channel_layout.h" #include "libavutil/parseutils.h" #include "libavutil/samplefmt.h" #include "libavutil/fifo.h" #include "libavutil/intreadwrite.h" #include "libavutil/dict.h" #include "libavutil/mathematics.h" #include "libavutil/pixdesc.h" #include "libavutil/avstring.h" #include "libavutil/libm.h" #include "libavutil/imgutils.h" #include "libavutil/timestamp.h" #include "libavutil/bprint.h" #include "libavutil/time.h" #include "libavutil/threadmessage.h" #include "libavformat/os_support.h" # include "libavfilter/avcodec.h" # include "libavfilter/avfilter.h" # include "libavfilter/buffersrc.h" # include "libavfilter/buffersink.h" #if HAVE_SYS_RESOURCE_H #include <sys/time.h> #include <sys/types.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 #if HAVE_PTHREADS #include <pthread.h> #endif #include <time.h> #include "ffmpeg.h" #include "cmdutils.h" #include "libavutil/avassert.h" const char program_name[] = "ffmpeg"; const int program_birth_year = 2000; static FILE *vstats_file; const char *const forced_keyframes_const_names[] = { "n", "n_forced", "prev_forced_n", "prev_forced_t", "t", NULL }; static void do_video_stats(OutputStream *ost, int frame_size); static int64_t getutime(void); static int64_t getmaxrss(void); static int run_as_daemon = 0; static int nb_frames_dup = 0; static int nb_frames_drop = 0; static int64_t decode_error_stat[2]; static int current_time; AVIOContext *progress_avio = NULL; static uint8_t *subtitle_out; #define DEFAULT_PASS_LOGFILENAME_PREFIX "ffmpeg2pass" InputStream **input_streams = NULL; int nb_input_streams = 0; InputFile **input_files = NULL; int nb_input_files = 0; OutputStream **output_streams = NULL; int nb_output_streams = 0; OutputFile **output_files = NULL; int nb_output_files = 0; FilterGraph **filtergraphs; int nb_filtergraphs; #if HAVE_TERMIOS_H /* init terminal so that we can grab keys */ static struct termios oldtty; static int restore_tty; #endif #if HAVE_PTHREADS static void free_input_threads(void); #endif /* sub2video hack: Convert subtitles to video with alpha to insert them in filter graphs. This is a temporary solution until libavfilter gets real subtitles support. */ static int sub2video_get_blank_frame(InputStream *ist) { int ret; AVFrame *frame = ist->sub2video.frame; av_frame_unref(frame); ist->sub2video.frame->width = ist->sub2video.w; ist->sub2video.frame->height = ist->sub2video.h; ist->sub2video.frame->format = AV_PIX_FMT_RGB32; if ((ret = av_frame_get_buffer(frame, 32)) < 0) return ret; memset(frame->data[0], 0, frame->height * frame->linesize[0]); return 0; } static void sub2video_copy_rect(uint8_t *dst, int dst_linesize, int w, int h, AVSubtitleRect *r) { uint32_t *pal, *dst2; uint8_t *src, *src2; int x, y; if (r->type != SUBTITLE_BITMAP) { av_log(NULL, AV_LOG_WARNING, "sub2video: non-bitmap subtitle\n"); return; } if (r->x < 0 || r->x + r->w > w || r->y < 0 || r->y + r->h > h) { av_log(NULL, AV_LOG_WARNING, "sub2video: rectangle overflowing\n"); return; } dst += r->y * dst_linesize + r->x * 4; src = r->pict.data[0]; pal = (uint32_t *)r->pict.data[1]; for (y = 0; y < r->h; y++) { dst2 = (uint32_t *)dst; src2 = src; for (x = 0; x < r->w; x++) *(dst2++) = pal[*(src2++)]; dst += dst_linesize; src += r->pict.linesize[0]; } } static void sub2video_push_ref(InputStream *ist, int64_t pts) { AVFrame *frame = ist->sub2video.frame; int i; av_assert1(frame->data[0]); ist->sub2video.last_pts = frame->pts = pts; for (i = 0; i < ist->nb_filters; i++) av_buffersrc_add_frame_flags(ist->filters[i]->filter, frame, AV_BUFFERSRC_FLAG_KEEP_REF | AV_BUFFERSRC_FLAG_PUSH); } static void sub2video_update(InputStream *ist, AVSubtitle *sub) { int w = ist->sub2video.w, h = ist->sub2video.h; AVFrame *frame = ist->sub2video.frame; int8_t *dst; int dst_linesize; int num_rects, i; int64_t pts, end_pts; if (!frame) return; if (sub) { pts = av_rescale_q(sub->pts + sub->start_display_time * 1000LL, AV_TIME_BASE_Q, ist->st->time_base); end_pts = av_rescale_q(sub->pts + sub->end_display_time * 1000LL, AV_TIME_BASE_Q, ist->st->time_base); num_rects = sub->num_rects; } else { pts = ist->sub2video.end_pts; end_pts = INT64_MAX; num_rects = 0; } if (sub2video_get_blank_frame(ist) < 0) { av_log(ist->dec_ctx, AV_LOG_ERROR, "Impossible to get a blank canvas.\n"); return; } dst = frame->data [0]; dst_linesize = frame->linesize[0]; for (i = 0; i < num_rects; i++) sub2video_copy_rect(dst, dst_linesize, w, h, sub->rects[i]); sub2video_push_ref(ist, pts); ist->sub2video.end_pts = end_pts; } static void sub2video_heartbeat(InputStream *ist, int64_t pts) { InputFile *infile = input_files[ist->file_index]; int i, j, nb_reqs; int64_t pts2; /* When a frame is read from a file, examine all sub2video streams in the same file and send the sub2video frame again. Otherwise, decoded video frames could be accumulating in the filter graph while a filter (possibly overlay) is desperately waiting for a subtitle frame. */ for (i = 0; i < infile->nb_streams; i++) { InputStream *ist2 = input_streams[infile->ist_index + i]; if (!ist2->sub2video.frame) continue; /* subtitles seem to be usually muxed ahead of other streams; if not, subtracting a larger time here is necessary */ pts2 = av_rescale_q(pts, ist->st->time_base, ist2->st->time_base) - 1; /* do not send the heartbeat frame if the subtitle is already ahead */ if (pts2 <= ist2->sub2video.last_pts) continue; if (pts2 >= ist2->sub2video.end_pts || !ist2->sub2video.frame->data[0]) sub2video_update(ist2, NULL); for (j = 0, nb_reqs = 0; j < ist2->nb_filters; j++) nb_reqs