/*
* 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.
* @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 kbit/s */
#define OUTPUT_BIT_RATE 96000
/** The number of output channels */
#define OUTPUT_CHANNELS 2
/**
* Convert an error code into a text message.
* @param error Error code to be converted
* @return Corresponding error text (not thread-safe)
*/
static const char *get_error_text(const int error)
{
static char error_buffer[255];
av_strerror(error, error_buffer, sizeof(error_buffer));
return error_buffer;
}
/** Open an input file and the required decoder. */
static int open_input_file(const char *filename,
AVFormatContext **input_format_context,
AVCodecContext **input_codec_context)
{
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, get_error_text(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",
get_error_text(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]->codec->codec_id))) {
fprintf(stderr, "Could not find input codec\n");
avformat_close_input(input_format_context);
return AVERROR_EXIT;
}
/** Open the decoder for the audio stream to use it later. */
if ((error = avcodec_open2((*input_format_context)->streams[0]->codec,
input_codec, NULL)) < 0) {
fprintf(stderr, "Could not open input codec (error '%s')\n",
get_error_text(error));
avformat_close_input(input_format_context);
return error;
}
/** Save the decoder context for easier access later. */
*input_codec_context = (*input_format_context)->streams[0]->codec;
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.
*/
static int open_output_file(const char *filename,
AVCodecContext *input_codec_context,
AVFormatContext **output_format_context,
AVCodecContext **output_codec_context)
{
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, get_error_text(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;
}
av_strlcpy((*output_format_context)->filename, filename,
sizeof((*output_format_context)->filename));
/** 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, output_codec))) {
fprintf(stderr, "Could not create new stream\n");
error = AVERROR(ENOMEM);
goto cleanup;
}
/** Save the encoder context for easier access later. */
*output_codec_context = stream->codec;
/**
* Set the basic encoder parameters.
* The input file's sample rate is used to avoid a sample rate conversion.
*/
(*output_codec_context)->channels = OUTPUT_CHANNELS;
(*output_codec_context)->channel_layout = av_get_default_channel_layout(OUTPUT_CHANNELS);
(*output_codec_context)->sample_rate = input_codec_context->sample_rate;
(*output_codec_context)->sample_fmt = output_codec->sample_fmts[0];
(*output_codec_context)->bit_rate = OUTPUT_BIT_RATE;
/** Allow the use of the experimental AAC encoder */
(*output_codec_context)->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.
*/
if ((*output_format_context)->oformat->flags & AVFMT_GLOBALHEADER)
(*output_codec_context)->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
/** Open the encoder for the audio stream to use it later. */
if ((error = avcodec_open2(*output_codec_context, output_codec, NULL)) < 0) {
fprintf(stderr, "Could not open output codec (error '%s')\n",
get_error_text(error));
goto cleanup;
}
return 0;
cleanup:
avio_closep(&(*output_format_context)->pb);
avformat_free_context(*output_format_context);
*output_format_context = NULL;
return error < 0 ? error : AVERROR_EXIT;
}
/** Initialize one data packet for reading or writing. */
static void init_packet(AVPacket *packet)
{
av_init_packet(packet);
/** Set the packet data and size so that it is recognized as being empty. */
packet->data = NULL;
pa
没有合适的资源?快使用搜索试试~ 我知道了~
Android上的ffmpeg
共423个文件
h:297个
c:51个
pc:24个
需积分: 10 9 下载量 101 浏览量
2016-08-10
18:48:19
上传
评论
收藏 54.87MB ZIP 举报
温馨提示
Android版本的ffmpeg,库已经编译进去,可以直接执行,支持X264
资源推荐
资源详情
资源评论
收起资源包目录
Android上的ffmpeg (423个子文件)
libavcodec.a 16.35MB
libavcodec.a 13.9MB
libavcodec.a 13.9MB
libavformat.a 3.54MB
libavformat.a 3.13MB
libavformat.a 3.13MB
libavfilter.a 2.49MB
libavfilter.a 2.3MB
libavfilter.a 2.3MB
libswscale.a 727KB
libavutil.a 643KB
libavutil.a 578KB
libavutil.a 578KB
libswscale.a 482KB
libswscale.a 482KB
libswresample.a 164KB
libpostproc.a 132KB
libswresample.a 111KB
libswresample.a 111KB
libavdevice.a 79KB
libavdevice.a 73KB
libavdevice.a 73KB
libpostproc.a 38KB
libpostproc.a 38KB
transcode_aac.c 28KB
transcode_aac.c 28KB
transcode_aac.c 28KB
muxing.c 21KB
muxing.c 21KB
muxing.c 21KB
transcoding.c 20KB
transcoding.c 20KB
transcoding.c 20KB
decoding_encoding.c 19KB
decoding_encoding.c 19KB
decoding_encoding.c 19KB
qsvdec.c 14KB
qsvdec.c 14KB
qsvdec.c 14KB
demuxing_decoding.c 14KB
demuxing_decoding.c 14KB
demuxing_decoding.c 14KB
filter_audio.c 12KB
filter_audio.c 12KB
filter_audio.c 12KB
filtering_audio.c 10KB
filtering_audio.c 10KB
filtering_audio.c 10KB
filtering_video.c 9KB
filtering_video.c 9KB
filtering_video.c 9KB
resampling_audio.c 8KB
resampling_audio.c 8KB
resampling_audio.c 8KB
extract_mvs.c 6KB
extract_mvs.c 6KB
extract_mvs.c 6KB
avio_dir_cmd.c 6KB
avio_dir_cmd.c 6KB
avio_dir_cmd.c 6KB
remuxing.c 5KB
remuxing.c 5KB
remuxing.c 5KB
http_multiclient.c 5KB
http_multiclient.c 5KB
http_multiclient.c 5KB
scaling_video.c 5KB
scaling_video.c 5KB
scaling_video.c 5KB
avio_reading.c 4KB
avio_reading.c 4KB
avio_reading.c 4KB
metadata.c 2KB
metadata.c 2KB
metadata.c 2KB
ffmpeg 20.88MB
ffmpeg 17.59MB
ffmpeg 17.59MB
libvpx-1080p.ffpreset 227B
libvpx-720p.ffpreset 227B
libvpx-720p50_60.ffpreset 227B
libvpx-1080p50_60.ffpreset 227B
libvpx-720p.ffpreset 227B
libvpx-720p50_60.ffpreset 227B
libvpx-1080p.ffpreset 227B
libvpx-1080p50_60.ffpreset 227B
libvpx-720p.ffpreset 227B
libvpx-1080p.ffpreset 227B
libvpx-720p50_60.ffpreset 227B
libvpx-1080p50_60.ffpreset 227B
libvpx-360p.ffpreset 219B
libvpx-360p.ffpreset 219B
libvpx-360p.ffpreset 219B
avcodec.h 173KB
avcodec.h 173KB
avcodec.h 173KB
avformat.h 108KB
avformat.h 108KB
avformat.h 108KB
avfilter.h 39KB
共 423 条
- 1
- 2
- 3
- 4
- 5
资源评论
TheSaviour
- 粉丝: 55
- 资源: 1
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功