/*
* 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/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;
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;
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 the encoder so that it behaves accordingly.
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收起资源包目录
Android FFmpeg 6.1+FFmpeg 4.0.2 (712个子文件)
ffmpeg-all.1 1.8MB
ffmpeg-all.1 1.8MB
ffprobe-all.1 1.43MB
ffprobe-all.1 1.43MB
ffmpeg-filters.1 1.02MB
ffmpeg-filters.1 1.02MB
ffmpeg-codecs.1 222KB
ffmpeg-codecs.1 222KB
ffmpeg-formats.1 179KB
ffmpeg-formats.1 179KB
ffmpeg.1 139KB
ffmpeg.1 139KB
ffmpeg-protocols.1 81KB
ffmpeg-protocols.1 81KB
ffprobe.1 43KB
ffprobe.1 43KB
ffmpeg-bitstream-filters.1 38KB
ffmpeg-bitstream-filters.1 38KB
ffmpeg-utils.1 37KB
ffmpeg-utils.1 37KB
ffmpeg-resampler.1 14KB
ffmpeg-resampler.1 14KB
ffmpeg-scaler.1 9KB
ffmpeg-scaler.1 9KB
libswresample.3 6KB
libswresample.3 6KB
libswscale.3 5KB
libswscale.3 5KB
libavutil.3 5KB
libavutil.3 5KB
libavcodec.3 5KB
libavcodec.3 5KB
libavformat.3 5KB
libavformat.3 5KB
libavfilter.3 5KB
libavfilter.3 5KB
libavcodec.a 110.86MB
libavcodec.a 107.26MB
libavcodec.a 92.46MB
libavcodec.a 67.46MB
libavformat.a 49.46MB
libavformat.a 38.45MB
libavformat.a 36.75MB
libavformat.a 32.9MB
libavfilter.a 30.62MB
libavfilter.a 28.16MB
libavfilter.a 20.2MB
libavfilter.a 12.84MB
libswscale.a 5.11MB
libswscale.a 3.61MB
libavutil.a 3.49MB
libswscale.a 3.01MB
libavutil.a 2.71MB
libswscale.a 2.68MB
libavutil.a 2.29MB
libavutil.a 1.55MB
libswresample.a 578KB
libswresample.a 458KB
libswresample.a 439KB
libswresample.a 396KB
transcode_aac.c 34KB
transcode_aac.c 34KB
transcode_aac.c 33KB
transcode_aac.c 33KB
transcode.c 23KB
transcode.c 23KB
transcoding.c 22KB
transcoding.c 22KB
muxing.c 21KB
muxing.c 21KB
mux.c 20KB
mux.c 20KB
qsv_transcode.c 15KB
qsv_transcode.c 15KB
demuxing_decoding.c 14KB
demuxing_decoding.c 14KB
demux_decode.c 13KB
demux_decode.c 13KB
filter_audio.c 12KB
filter_audio.c 12KB
filter_audio.c 12KB
filter_audio.c 12KB
decode_filter_audio.c 10KB
decode_filter_audio.c 10KB
filtering_audio.c 10KB
filtering_audio.c 10KB
vaapi_transcode.c 10KB
vaapi_transcode.c 10KB
vaapi_transcode.c 9KB
vaapi_transcode.c 9KB
filtering_video.c 9KB
filtering_video.c 9KB
decode_filter_video.c 9KB
decode_filter_video.c 9KB
qsvdec.c 8KB
qsvdec.c 8KB
resample_audio.c 8KB
resample_audio.c 8KB
hw_decode.c 8KB
hw_decode.c 8KB
共 712 条
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资源评论
- vuvuvu2024-04-24无法使用...在找到32位的ffmpeg不到1mb 我对改名为 ffmpeg.exe后 查询媒体信息后,约5秒返回了Program too big to fit in memory但我的内存并没有增加...中评吧,毕竟楼主辛苦了,但我下载后再测试也是很耽误时间呢 #参考意义不大 #内容缺失
javy_codercoder
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