/*
* Copyright (c) 2013-2018 Andreas Unterweger
*
* 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
* Simple audio converter
*
* @example transcode_aac.c
* Convert an input audio file to AAC in an MP4 container using FFmpeg.
* Formats other than MP4 are supported based on the output file extension.
* @author Andreas Unterweger (dustsigns@gmail.com)
*/
#include <stdio.h>
#include "libavformat/avformat.h"
#include "libavformat/avio.h"
#include "libavcodec/avcodec.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/frame.h"
#include "libavutil/opt.h"
#include "libswresample/swresample.h"
/* The output bit rate in bit/s */
#define OUTPUT_BIT_RATE 96000
/* The number of output channels */
#define OUTPUT_CHANNELS 2
/**
* Open an input file and the required decoder.
* @param filename File to be opened
* @param[out] input_format_context Format context of opened file
* @param[out] input_codec_context Codec context of opened file
* @return Error code (0 if successful)
*/
static int open_input_file(const char *filename,
AVFormatContext **input_format_context,
AVCodecContext **input_codec_context)
{
AVCodecContext *avctx;
const AVCodec *input_codec;
int error;
/* Open the input file to read from it. */
if ((error = avformat_open_input(input_format_context, filename, NULL,
NULL)) < 0) {
fprintf(stderr, "Could not open input file '%s' (error '%s')\n",
filename, av_err2str(error));
*input_format_context = NULL;
return error;
}
/* Get information on the input file (number of streams etc.). */
if ((error = avformat_find_stream_info(*input_format_context, NULL)) < 0) {
fprintf(stderr, "Could not open find stream info (error '%s')\n",
av_err2str(error));
avformat_close_input(input_format_context);
return error;
}
/* Make sure that there is only one stream in the input file. */
if ((*input_format_context)->nb_streams != 1) {
fprintf(stderr, "Expected one audio input stream, but found %d\n",
(*input_format_context)->nb_streams);
avformat_close_input(input_format_context);
return AVERROR_EXIT;
}
/* Find a decoder for the audio stream. */
if (!(input_codec = avcodec_find_decoder((*input_format_context)->streams[0]->codecpar->codec_id))) {
fprintf(stderr, "Could not find input codec\n");
avformat_close_input(input_format_context);
return AVERROR_EXIT;
}
/* Allocate a new decoding context. */
avctx = avcodec_alloc_context3(input_codec);
if (!avctx) {
fprintf(stderr, "Could not allocate a decoding context\n");
avformat_close_input(input_format_context);
return AVERROR(ENOMEM);
}
/* Initialize the stream parameters with demuxer information. */
error = avcodec_parameters_to_context(avctx, (*input_format_context)->streams[0]->codecpar);
if (error < 0) {
avformat_close_input(input_format_context);
avcodec_free_context(&avctx);
return error;
}
/* Open the decoder for the audio stream to use it later. */
if ((error = avcodec_open2(avctx, input_codec, NULL)) < 0) {
fprintf(stderr, "Could not open input codec (error '%s')\n",
av_err2str(error));
avcodec_free_context(&avctx);
avformat_close_input(input_format_context);
return error;
}
/* Save the decoder context for easier access later. */
*input_codec_context = avctx;
return 0;
}
/**
* Open an output file and the required encoder.
* Also set some basic encoder parameters.
* Some of these parameters are based on the input file's parameters.
* @param filename File to be opened
* @param input_codec_context Codec context of input file
* @param[out] output_format_context Format context of output file
* @param[out] output_codec_context Codec context of output file
* @return Error code (0 if successful)
*/
static int open_output_file(const char *filename,
AVCodecContext *input_codec_context,
AVFormatContext **output_format_context,
AVCodecContext **output_codec_context)
{
AVCodecContext *avctx = NULL;
AVIOContext *output_io_context = NULL;
AVStream *stream = NULL;
const AVCodec *output_codec = NULL;
int error;
/* Open the output file to write to it. */
if ((error = avio_open(&output_io_context, filename,
AVIO_FLAG_WRITE)) < 0) {
fprintf(stderr, "Could not open output file '%s' (error '%s')\n",
filename, av_err2str(error));
return error;
}
/* Create a new format context for the output container format. */
if (!(*output_format_context = avformat_alloc_context())) {
fprintf(stderr, "Could not allocate output format context\n");
return AVERROR(ENOMEM);
}
/* Associate the output file (pointer) with the container format context. */
(*output_format_context)->pb = output_io_context;
/* Guess the desired container format based on the file extension. */
if (!((*output_format_context)->oformat = av_guess_format(NULL, filename,
NULL))) {
fprintf(stderr, "Could not find output file format\n");
goto cleanup;
}
if (!((*output_format_context)->url = av_strdup(filename))) {
fprintf(stderr, "Could not allocate url.\n");
error = AVERROR(ENOMEM);
goto cleanup;
}
/* Find the encoder to be used by its name. */
if (!(output_codec = avcodec_find_encoder(AV_CODEC_ID_AAC))) {
fprintf(stderr, "Could not find an AAC encoder.\n");
goto cleanup;
}
/* Create a new audio stream in the output file container. */
if (!(stream = avformat_new_stream(*output_format_context, NULL))) {
fprintf(stderr, "Could not create new stream\n");
error = AVERROR(ENOMEM);
goto cleanup;
}
avctx = avcodec_alloc_context3(output_codec);
if (!avctx) {
fprintf(stderr, "Could not allocate an encoding context\n");
error = AVERROR(ENOMEM);
goto cleanup;
}
/* Set the basic encoder parameters.
* The input file's sample rate is used to avoid a sample rate conversion. */
avctx->channels = OUTPUT_CHANNELS;
avctx->channel_layout = av_get_default_channel_layout(OUTPUT_CHANNELS);
avctx->sample_rate = input_codec_context->sample_rate;
avctx->sample_fmt = output_codec->sample_fmts[0];
avctx->bit_rate = OUTPUT_BIT_RATE;
/* Allow the use of the experimental AAC encoder. */
avctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
/* Set the sample rate for the container. */
stream->time_base.den = input_codec_context->sample_rate;
stream->time_base.num = 1;
/* Some container formats (like MP4) require global headers to be present.
* Mark
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qt整合ffmpeg实现点击按钮显示ffmpeg版本
共216个文件
h:127个
c:23个
1:15个
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qt整合ffmpeg实现点击按钮显示ffmpeg版本 (216个子文件)
ffmpeg-all.1 1.75MB
ffprobe-all.1 1.4MB
ffplay-all.1 1.39MB
ffmpeg-filters.1 923KB
ffmpeg-codecs.1 198KB
ffmpeg-formats.1 176KB
ffmpeg.1 126KB
ffmpeg-devices.1 79KB
ffmpeg-protocols.1 76KB
ffprobe.1 43KB
ffmpeg-bitstream-filters.1 36KB
ffmpeg-utils.1 36KB
ffplay.1 32KB
ffmpeg-resampler.1 14KB
ffmpeg-scaler.1 9KB
libavcodec.so.59.23.100 12.57MB
libavfilter.so.8.27.100 3.68MB
libavutil.so.57.23.100 813KB
libswscale.so.6.5.100 634KB
libswresample.so.4.4.100 114KB
libavdevice.so.59.5.100 75KB
libavformat.so.59.18.101 2.45MB
libswresample.3 6KB
libswscale.3 5KB
libavutil.3 5KB
libavcodec.3 5KB
libavformat.3 5KB
libavdevice.3 5KB
libavfilter.3 5KB
libswresample.so.4 114KB
libavutil.so.57 813KB
libavcodec.so.59 12.57MB
libavformat.so.59 2.45MB
libavdevice.so.59 75KB
libswscale.so.6 634KB
libavfilter.so.8 3.68MB
transcode_aac.c 34KB
transcoding.c 22KB
muxing.c 21KB
demuxing_decoding.c 13KB
filter_audio.c 12KB
filtering_audio.c 10KB
vaapi_transcode.c 10KB
filtering_video.c 9KB
hw_decode.c 8KB
resampling_audio.c 8KB
decode_audio.c 7KB
qsvdec.c 7KB
vaapi_encode.c 7KB
encode_audio.c 6KB
encode_video.c 6KB
remuxing.c 6KB
extract_mvs.c 6KB
decode_video.c 5KB
http_multiclient.c 5KB
scaling_video.c 5KB
avio_list_dir.c 4KB
avio_reading.c 4KB
metadata.c 2KB
mainwindow.cpp 623B
main.cpp 197B
ffmpeg 257KB
ffplay 121KB
libvpx-1080p.ffpreset 227B
libvpx-1080p50_60.ffpreset 227B
libvpx-720p.ffpreset 227B
libvpx-720p50_60.ffpreset 227B
libvpx-360p.ffpreset 219B
ffprobe 149KB
avcodec.h 110KB
avformat.h 110KB
avfilter.h 42KB
pixfmt.h 36KB
opt.h 36KB
frame.h 31KB
avio.h 30KB
hwcontext.h 24KB
packet.h 23KB
mem.h 23KB
swresample.h 21KB
intreadwrite.h 18KB
avdevice.h 18KB
codec.h 17KB
common.h 17KB
codec_id.h 17KB
swscale.h 15KB
avstring.h 15KB
pixdesc.h 15KB
fifo.h 15KB
imgutils.h 13KB
log.h 12KB
hdr_dynamic_metadata.h 12KB
buffer.h 12KB
bsf.h 11KB
channel_layout.h 10KB
samplefmt.h 10KB
avutil.h 9KB
hwcontext_vulkan.h 9KB
film_grain_params.h 8KB
hash.h 8KB
共 216 条
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