ffmpeg 调整相片大小_使用ffmpeg进行图片格式转换和图片缩放—jpg to yuv420/.mp4 to yuv420 | 学步园...

//.h#ifndef _JPG_PROCESS_H

#define _JPG_PROCESS_H

#if !defined PRId64 || PRI_MACROS_BROKEN

# undef PRId64

# define PRId64 "lld"

#endif

#ifndef INT64_C

#define INT64_C

#define UINT64_C

#endif

#include

namespace ffmpeg{

extern "C"

{

#include

#include

#include

#include

#include

#include

}

}

using namespace ffmpeg;

struct JpgProcessParam

{

AVFormatContext *fmt_ctx;

AVCodecContext *video_dec_ctx, *audio_dec_ctx;

AVStream *video_stream, *audio_stream;

char *in_filename;

char *out_filename;

char *audio_dst_filename;

FILE *video_dst_file;

FILE *audio_dst_file;

uint8_t *video_dst_data[4];

int video_dst_linesize[4];

int video_dst_bufsize;

int video_stream_idx, audio_stream_idx;

AVFrame *frame;

AVPacket pkt;

int video_frame_count;

int audio_frame_count;

};

class JpgProcess

{

private:

int decode_packet(int *got_frame, int cached);

int open_codec_context(int *stream_idx, AVFormatContext *fmt_ctx, enum AVMediaType type);

int get_format_from_sample_fmt(const char **fmt, enum AVSampleFormat sample_fmt);

int main_jpg();

JpgProcessParam jpgProcessParam;

public:

bool jpgprocess(char *src_filename, char *dst_filename);

};

#endif

//.cpp

#include "jpgprocess.h"

bool JpgProcess::jpgprocess(char *src_filename, char *dst_filename)

{

if ((NULL == src_filename) || (NULL == dst_filename))

return false;

memset(&jpgProcessParam, 0x00, sizeof(jpgProcessParam));

jpgProcessParam.in_filename = src_filename;

jpgProcessParam.out_filename = dst_filename;

main_jpg();

return true;

}

int JpgProcess::main_jpg()

{

int ret = 0, got_frame;

/* register all formats and codecs */

av_register_all();

/* open input file, and allocate format context */

if (avformat_open_input(&jpgProcessParam.fmt_ctx, jpgProcessParam.in_filename, NULL, NULL) < 0) {

fprintf(stderr, "Could not open source file %s\n", jpgProcessParam.in_filename);

exit(1);

}

/* retrieve stream information */

if (avformat_find_stream_info(jpgProcessParam.fmt_ctx, NULL) < 0) {

fprintf(stderr, "Could not find stream information\n");

exit(1);

}

if (open_codec_context(&jpgProcessParam.video_stream_idx, jpgProcessParam.fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) {

jpgProcessParam.video_stream = jpgProcessParam.fmt_ctx->streams[jpgProcessParam.video_stream_idx];

jpgProcessParam.video_dec_ctx = jpgProcessParam.video_stream->codec;

jpgProcessParam.video_dst_file = fopen(jpgProcessParam.out_filename, "wb");

if (!jpgProcessParam.video_dst_file) {

fprintf(stderr, "Could not open destination file %s\n", jpgProcessParam.out_filename);

ret = 1;

goto end;

}

/* allocate image where the decoded image will be put */

ret = av_image_alloc(jpgProcessParam.video_dst_data, jpgProcessParam.video_dst_linesize,

jpgProcessParam.video_dec_ctx->width, jpgProcessParam.video_dec_ctx->height,

jpgProcessParam.video_dec_ctx->pix_fmt, 1);

if (ret < 0) {

fprintf(stderr, "Could not allocate raw video buffer\n");

goto end;

}

jpgProcessParam.video_dst_bufsize = ret;

}

if (open_codec_context(&jpgProcessParam.audio_stream_idx, jpgProcessParam.fmt_ctx, AVMEDIA_TYPE_AUDIO) >= 0) {

jpgProcessParam.audio_stream = jpgProcessParam.fmt_ctx->streams[jpgProcessParam.audio_stream_idx];

jpgProcessParam.audio_dec_ctx = jpgProcessParam.audio_stream->codec;

jpgProcessParam.audio_dst_file = fopen(jpgProcessParam.audio_dst_filename, "wb");

if (!jpgProcessParam.audio_dst_file) {

fprintf(stderr, "Could not open destination file %s\n", jpgProcessParam.out_filename);

ret = 1;

goto end;

}

}

/* dump input information to stderr */

av_dump_format(jpgProcessParam.fmt_ctx, 0, jpgProcessParam.in_filename, 0);

if (!jpgProcessParam.audio_stream && !jpgProcessParam.video_stream) {

fprintf(stderr, "Could not find audio or video stream in the input, aborting\n");

ret = 1;

goto end;

}

jpgProcessParam.frame = avcodec_alloc_frame();

if (!jpgProcessParam.frame) {

fprintf(stderr, "Could not allocate frame\n");

ret = AVERROR(ENOMEM);

goto end;

}

/* initialize packet, set data to NULL, let the demuxer fill it */

av_init_packet(&jpgProcessParam.pkt);

jpgProcessParam.pkt.data = NULL;

jpgProcessParam.pkt.size = 0;

if (jpgProcessParam.video_stream)

printf("Demuxing video from file '%s' into '%s'\n", jpgProcessParam.in_filename, jpgProcessParam.out_filename);

if (jpgProcessParam.audio_stream)

printf("Demuxing audio from file '%s' into '%s'\n", jpgProcessParam.in_filename, jpgProcessParam.audio_dst_filename);

/* read frames from the file */

while (av_read_frame(jpgProcessParam.fmt_ctx, &jpgProcessParam.pkt) >= 0) {

AVPacket orig_pkt = jpgProcessParam.pkt;

do {

ret = decode_packet(&got_frame, 0);

if (ret < 0)

break;

jpgProcessParam.pkt.data += ret;

jpgProcessParam.pkt.size -= ret;

} while (jpgProcessParam.pkt.size > 0);

av_free_packet(&orig_pkt);

}

/* flush cached frames */

jpgProcessParam.pkt.data = NULL;

jpgProcessParam.pkt.size = 0;

do {

decode_packet(&got_frame, 1);

} while (got_frame);

printf("Demuxing succeeded.\n");

if (jpgProcessParam.video_stream) {

printf("Play the output video file with the command:\n"

"ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n",

av_get_pix_fmt_name(jpgProcessParam.video_dec_ctx->pix_fmt), jpgProcessParam.video_dec_ctx->width, jpgProcessParam.video_dec_ctx->height,

jpgProcessParam.out_filename);

}

if (jpgProcessParam.audio_stream) {

enum AVSampleFormat sfmt = jpgProcessParam.audio_dec_ctx->sample_fmt;

int n_channels = jpgProcessParam.audio_dec_ctx->channels;

const char *fmt;

if (av_sample_fmt_is_planar(sfmt)) {

const char *packed = av_get_sample_fmt_name(sfmt);

printf("Warning: the sample format the decoder produced is planar "

"(%s). This example will output the first channel only.\n",

packed ? packed : "?");

sfmt = av_get_packed_sample_fmt(sfmt);

n_channels = 1;

}

if ((ret = get_format_from_sample_fmt(&fmt, sfmt)) < 0)

goto end;

printf("Play the output audio file with the command:\n"

"ffplay -f %s -ac %d -ar %d %s\n",

fmt, n_channels, jpgProcessParam.audio_dec_ctx->sample_rate,

jpgProcessParam.audio_dst_filename);

}

end:

if (jpgProcessParam.video_dec_ctx)

avcodec_close(jpgProcessParam.video_dec_ctx);

if (jpgProcessParam.audio_dec_ctx)

avcodec_close(jpgProcessParam.audio_dec_ctx);

avformat_close_input(&jpgProcessParam.fmt_ctx);

if (jpgProcessParam.video_dst_file)

fclose(jpgProcessParam.video_dst_file);

if (jpgProcessParam.audio_dst_file)

fclose(jpgProcessParam.audio_dst_file);

av_free(jpgProcessParam.frame);

av_free(jpgProcessParam.video_dst_data[0]);

return ret < 0;

}

int JpgProcess::decode_packet(int *got_frame, int cached)

{

int ret = 0;

int decoded = jpgProcessParam.pkt.size;

if (jpgProcessParam.pkt.stream_index == jpgProcessParam.video_stream_idx) {

/* decode video frame */

ret = avcodec_decode_video2(jpgProcessParam.video_dec_ctx, jpgProcessParam.frame, got_frame, &jpgProcessParam.pkt);

if (ret < 0) {

fprintf(stderr, "Error decoding video frame\n");

return ret;

}

if (*got_frame) {

printf("video_frame%s n:%d coded_n:%d pts:%s\n",

cached ? "(cached)" : "",

jpgProcessParam.video_frame_count++, jpgProcessParam.frame->coded_picture_number,

av_ts2timestr(jpgProcessParam.frame->pts, &jpgProcessParam.video_dec_ctx->time_base));

/* copy decoded frame to destination buffer:

* this is required since rawvideo expects non aligned data */

av_image_copy(jpgProcessParam.video_dst_data, jpgProcessParam.video_dst_linesize,

(const uint8_t **)(jpgProcessParam.frame->data), jpgProcessParam.frame->linesize,

jpgProcessParam.video_dec_ctx->pix_fmt, jpgProcessParam.video_dec_ctx->width, jpgProcessParam.video_dec_ctx->height);

/* write to rawvideo file */

// fwrite(jpgProcessParam.video_dst_data[0], 1, jpgProcessParam.video_dst_bufsize, jpgProcessParam.video_dst_file);

//ÍŒÏñËõС³Écif

{

uint8_t *dst_data[4];

int dst_linesize[4];

int dst_w = 352, dst_h = 288;

enum AVPixelFormat dst_pix_fmt = AV_PIX_FMT_YUV420P;

int dst_bufsize;

struct SwsContext *sws_ctx;

sws_ctx = sws_getContext(jpgProcessParam.video_dec_ctx->width,

jpgProcessParam.video_dec_ctx->height,

jpgProcessParam.video_dec_ctx->pix_fmt,

dst_w, dst_h, dst_pix_fmt,

SWS_BICUBIC, NULL, NULL, NULL);

if (!sws_ctx) {

fprintf(stderr,

"Impossible to create scale context for the conversion "

"fmt:%s s:%dx%d -> fmt:%s s:%dx%d\n",

av_get_pix_fmt_name(jpgProcessParam.video_dec_ctx->pix_fmt),

jpgProcessParam.video_dec_ctx->width,

jpgProcessParam.video_dec_ctx->height,

av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h);

ret = AVERROR(EINVAL);

exit(1);

}

/* allocate source and destination image buffers */

/*

if ((ret = av_image_alloc(src_data, src_linesize,

jpgProcessParam.video_dec_ctx->width, jpgProcessParam.video_dec_ctx->height, src_pix_fmt, 16)) < 0) {

fprintf(stderr, "Could not allocate source image\n");

exit(1);

}

*/

/* buffer is going to be written to rawvideo file, no alignment */

if ((ret = av_image_alloc(dst_data, dst_linesize,

dst_w, dst_h, dst_pix_fmt, 1)) < 0) {

fprintf(stderr, "Could not allocate destination image\n");

exit(1);

}

dst_bufsize = ret;

/* convert to destination format */

sws_scale(sws_ctx, (const uint8_t * const*)jpgProcessParam.video_dst_data,

jpgProcessParam.video_dst_linesize, 0, jpgProcessParam.video_dec_ctx->width, dst_data, dst_linesize);

fwrite(dst_data[0], 1, dst_bufsize, jpgProcessParam.video_dst_file);

av_freep(&dst_data[0]);

sws_freeContext(sws_ctx);

}

}

} else if (jpgProcessParam.pkt.stream_index == jpgProcessParam.audio_stream_idx) {

/* decode audio frame */

ret = avcodec_decode_audio4(jpgProcessParam.audio_dec_ctx, jpgProcessParam.frame, got_frame, &jpgProcessParam.pkt);

if (ret < 0) {

fprintf(stderr, "Error decoding audio frame\n");

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, jpgProcessParam.pkt.size);

if (*got_frame) {

size_t unpadded_linesize = jpgProcessParam.frame->nb_samples * av_get_bytes_per_sample((AVSampleFormat)jpgProcessParam.frame->format);

printf("audio_frame%s n:%d nb_samples:%d pts:%s\n",

cached ? "(cached)" : "",

jpgProcessParam.audio_frame_count++, jpgProcessParam.frame->nb_samples,

av_ts2timestr(jpgProcessParam.frame->pts, &jpgProcessParam.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 output planar audio, which uses a separate

* plane of audio samples for each channel (e.g. AV_SAMPLE_FMT_S16P).

* In other words, this code will write only the first audio channel

* in these cases.

* You should use libswresample or libavfilter to convert the frame

* to packed data. */

fwrite(jpgProcessParam.frame->extended_data[0], 1, unpadded_linesize, jpgProcessParam.audio_dst_file);

}

}

return decoded;

}

int JpgProcess::open_codec_context(int *stream_idx, AVFormatContext *fmt_ctx, enum AVMediaType type)

{

int ret;

AVStream *st;

AVCodecContext *dec_ctx = NULL;

AVCodec *dec = NULL;

ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0);

if (ret < 0) {

fprintf(stderr, "Could not find %s stream in input file '%s'\n",

av_get_media_type_string(type), jpgProcessParam.in_filename);

return ret;

} else {

*stream_idx = ret;

st = fmt_ctx->streams[*stream_idx];

/* find decoder for the stream */

dec_ctx = st->codec;

dec = avcodec_find_decoder(dec_ctx->codec_id);

if (!dec) {

fprintf(stderr, "Failed to find %s codec\n",

av_get_media_type_string(type));

return ret;

}

if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0) {

fprintf(stderr, "Failed to open %s codec\n",

av_get_media_type_string(type));

return ret;

}

}

return 0;

}

int JpgProcess::get_format_from_sample_fmt(const char **fmt, enum AVSampleFormat sample_fmt)

{

int i;

struct sample_fmt_entry {

enum AVSampleFormat sample_fmt; const char *fmt_be, *fmt_le;

} sample_fmt_entries[] = {

{ AV_SAMPLE_FMT_U8, "u8", "u8" },

{ AV_SAMPLE_FMT_S16, "s16be", "s16le" },

{ AV_SAMPLE_FMT_S32, "s32be", "s32le" },

{ AV_SAMPLE_FMT_FLT, "f32be", "f32le" },

{ AV_SAMPLE_FMT_DBL, "f64be", "f64le" },

};

*fmt = NULL;

for (i = 0; i < FF_ARRAY_ELEMS(sample_fmt_entries); i++) {

struct sample_fmt_entry *entry = &sample_fmt_entries[i];

if (sample_fmt == entry->sample_fmt) {

*fmt = AV_NE(entry->fmt_be, entry->fmt_le);

return 0;

}

}

fprintf(stderr,

"sample format %s is not supported as output format\n",

av_get_sample_fmt_name(sample_fmt));

return -1;

}