x265 ffmeg编解码的实例

/* * Copyright (c) 2012 Stefano Sabatini * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /** * @file * Demuxing and decoding example. * * Show how to use the libavformat and libavcodec API to demux and * decode audio and video data. * @example demuxing_decoding.c */ #include <libavutil/imgutils.h> #include <libavutil/samplefmt.h> #include <libavutil/timestamp.h> #include <libavformat/avformat.h> static AVFormatContext *fmt_ctx = NULL; static AVCodecContext *dec_ctx = NULL; static AVCodecContext *video_dec_ctx = NULL, *audio_dec_ctx = NULL; static AVCodecContext *video_enc_ctx = NULL; static int width, height; static enum AVPixelFormat pix_fmt; static AVStream *video_stream = NULL, *audio_stream = NULL; static const char *src_filename = NULL; static const char *dst_filename = NULL; static const char *video_dst_filename = NULL; static const char *audio_dst_filename = NULL; static const char *video_re_encoded_filename = NULL; static FILE *video_dst_file = NULL; static FILE *audio_dst_file = NULL; static FILE *video_re_encode_file = NULL; static uint8_t *video_dst_data[4] = {NULL}; static int video_dst_linesize[4]; static int video_dst_bufsize; static int video_stream_idx = -1, audio_stream_idx = -1; static AVFrame *frame = NULL; static AVPacket pkt; static int video_frame_count = 0; static int audio_frame_count = 0; /* Enable or disable frame reference counting. You are not supposed to support * both paths in your application but pick the one most appropriate to your * needs. Look for the use of refcount in this example to see what are the * differences of API usage between them. */ static int refcount = 0; static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, char *filename) { return; FILE *f; int i; f = fopen(filename,"w"); fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255); for (i = 0; i < ysize; i++) fwrite(buf + i * wrap, 1, xsize, f); fclose(f); } static int decode(AVCodecContext *dec_ctx, AVFrame *frame, AVPacket *pkt, const char *filename) { int ret = 0; ret = avcodec_send_packet(dec_ctx, pkt); printf("avcodec_send_packet ret:%d\n", ret); if (ret < 0) { fprintf(stderr, "Error sending a packet for decoding\n"); return ret; } while (ret >= 0) { ret = avcodec_receive_frame(dec_ctx, frame); printf("avcodec_receive_frame ret:%d, AVERROR(EAGAIN):%d, AVERROR_EOF:%d\n", ret, AVERROR(EAGAIN), AVERROR_EOF); if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) return ret; else if (ret < 0) { fprintf(stderr, "Error during decoding\n"); return ret; } if (pkt->stream_index == video_stream_idx) { printf("Decoded video frame[%3d]\n", dec_ctx->frame_number); fflush(stdout); /* the picture is allocated by the decoder. no need to * free it */ char buf[1024]; snprintf(buf, sizeof(buf), "%s-%d", filename, dec_ctx->frame_number); pgm_save(frame->data[0], frame->linesize[0], frame->width, frame->height, buf); } else if (pkt->stream_index == audio_stream_idx) { printf("Decoded audio samples [%d]\n", frame->nb_samples); int data_size = av_get_bytes_per_sample(dec_ctx->sample_fmt); if (data_size < 0) { /* This should not occur, checking just for paranoia */ fprintf(stderr, "Failed to calculate data size\n"); return -1; } int i, ch; for (i = 0; i < frame->nb_samples; i++) for (ch = 0; ch < dec_ctx->channels; ch++) fwrite(frame->data[ch] + data_size*i, 1, data_size, audio_dst_file); } } return ret; } static int decode_packet(int *got_frame, int cached) { int ret = 0; int decoded = pkt.size; *got_frame = 0; if (pkt.stream_index == video_stream_idx) { /* decode video frame */ ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt); if (ret < 0) { fprintf(stderr, "Error decoding video frame (%s)\n", av_err2str(ret)); return ret; } if (*got_frame) { if (frame->width != width || frame->height != height || frame->format != pix_fmt) { /* To handle this change, one could call av_image_alloc again and * decode the following frames into another rawvideo file. */ fprintf(stderr, "Error: Width, height and pixel format have to be " "constant in a rawvideo file, but the width, height or " "pixel format of the input video changed:\n" "old: width = %d, height = %d, format = %s\n" "new: width = %d, height = %d, format = %s\n", width, height, av_get_pix_fmt_name(pix_fmt), frame->width, frame->height, av_get_pix_fmt_name(frame->format)); return -1; } printf("video_frame%s n:%d coded_n:%d\n", cached ? "(cached)" : "", video_frame_count++, frame->coded_picture_number); /* copy decoded frame to destination buffer: * this is required since rawvideo expects non aligned data */ av_image_copy(video_dst_data, video_dst_linesize, (const uint8_t **)(frame->data), frame->linesize, pix_fmt, width, height); /* write to rawvideo file */ fwrite(video_dst_data[0], 1, video_dst_bufsize, video_dst_file); } } else if (pkt.stream_index == audio_stream_idx) { /* decode audio frame */ ret = avcodec_decode_audio4(audio_dec_ctx, frame, got_frame, &pkt); if (ret < 0) { fprintf(stderr, "Error decoding audio frame (%s)\n", av_err2str(ret)); return ret; } /* Some audio decoders decode only part of the packet, and have to be * called again with the remainder of the packet data. * Sample: fate-suite/lossless-audio/luckynight-partial.shn * Also, some decoders might over-read the packet. */ decoded = FFMIN(ret, pkt.size); if (*got_frame) { size_t unpadded_linesize = frame->nb_samples * av_get_bytes_per_sample(frame->format); printf("audio_frame%s n:%d nb_samples:%d pts:%s\n", cached ? "(cached)" : "", audio_frame_count++, frame->nb_samples, av_ts2timestr(frame->pts, &audio_dec_ctx->time_base)); /* Write the raw audio data samples of the first plane. This works * fine for packed formats (e.g. AV_SAMPLE_FMT_S16). However, * most audio decoders ou