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• libavutils : Add parse_r helper for MIPS

  18 juillet 2020, par Jiaxun Yang

  libavutils : Add parse_r helper for MIPS
  That helper grab from kernel code can allow us to inline
  
  newer instructions (not implemented by the assembler) in
  
  a elegant manner.
  Signed-off-by : Jiaxun Yang <jiaxun.yang@flygoat.com>
  
  Reviewed-by : Shiyou Yin <yinshiyou-hf@loongson.cn>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/mips/asmdefs.h

• When using libva* (ffmpeg) encoded GIF images, an error is reported when compiling the demo

  10 août 2023, par yangjinhui2936

  issuse : I need to use the GIF encoding feature in FFMPEG to encode argb images as gifs.Because the encoding effect of using GIF library is not as good as the effect of FFMPEG.
However, several libraries like avcodec were too bulky, so I did some cropping.I just want to keep the functionality of GIF encoding.
Below is my makefile for cropping ffmpeg :

  


  #!/bin/sh
# ./configure --prefix=$(pwd)/output --arch=arm --target-os=linux --enable-cross-compile --disable-asm --cross-prefix=arm-linux-gnueabihf- 
./configure --prefix=$(pwd)/output --target-os=linux --disable-asm \
--disable-gpl --enable-nonfree --enable-error-resilience --enable-debug --enable-shared --enable-small --enable-zlib \
--disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-programs --disable-symver\
 --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-decoder=h264 --enable-avformat \
 --disable-txtpages --enable-avcodec --enable-avutil \
 --disable-avresample --disable-avfilter --disable-avdevice --disable-postproc \
 --disable-swscale --enable-decoder=gif --enable-demuxer=gif --enable-muxer=gif --disable-iconv \
 --disable-v4l2-m2m --disable-indevs --disable-outdevs

make clean
make -j8

make install


  


  Then link the compiled so to the gif demo.
Blew is gif demo code(He was automatically generated by chatgpt, and I want to verify it) :

  


  #include 
// #include "output/include/imgutils.h"
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavutil/avutil.h"

int main() {
    AVCodec *enc_codec;
    AVCodecContext *enc_ctx = NULL;
    AVStream *stream = NULL;
    int ret;

    AVFormatContext *fmt_ctx = avformat_alloc_context();
    if (!fmt_ctx) {
        fprintf(stderr, "Could not allocate format context\n");
        return 1;
    }
    
    AVInputFormat *input_fmt = av_find_input_format("image2");
    if ((ret = avformat_open_input(&fmt_ctx, "input.bmp", input_fmt, NULL)) < 0) {
        fprintf(stderr, "Could not open input file %d\n", ret);
        return ret;
    }

    AVCodec *dec_codec = avcodec_find_decoder(AV_CODEC_ID_BMP);
    if (!dec_codec) {
        fprintf(stderr, "Decoder not found\n");
        return 1;
    }
    
    AVCodecContext *dec_ctx = avcodec_alloc_context3(dec_codec);
    if (!dec_ctx) {
        fprintf(stderr, "Could not allocate decoder context\n");
        return 1;
    }

    if ((ret = avcodec_open2(dec_ctx, dec_codec, NULL)) < 0) {
        fprintf(stderr, "Could not open decoder\n");
        return 1;
    }

    AVOutputFormat *out_fmt = av_guess_format("gif", NULL, NULL);
    if (!out_fmt) {
        fprintf(stderr, "Could not find output format\n");
        return 1;
    }

    AVFormatContext *out_ctx = NULL;
    if ((ret = avformat_alloc_output_context2(&out_ctx, out_fmt, NULL, NULL)) < 0) {
        fprintf(stderr, "Could not allocate output context\n");
        return 1;
    }

    stream = avformat_new_stream(out_ctx, NULL);
    if (!stream) {
        fprintf(stderr, "Could not create new stream\n");
        return 1;
    }

    enc_codec = avcodec_find_encoder(AV_CODEC_ID_GIF);
    if (!enc_codec) {
        fprintf(stderr, "Encoder not found\n");
        return 1;
    }

    enc_ctx = avcodec_alloc_context3(enc_codec);
    if (!enc_ctx) {
        fprintf(stderr, "Could not allocate encoder context\n");
        return 1;
    }

    if ((ret = avcodec_parameters_from_context(stream->codecpar, dec_ctx)) < 0) {
        fprintf(stderr, "Could not copy decoder parameters\n");
        return 1;
    }

    if ((ret = avcodec_open2(enc_ctx, enc_codec, NULL)) < 0) {
        fprintf(stderr, "Could not open encoder\n");
        return 1;
    }
    
    enc_ctx->pix_fmt = AV_PIX_FMT_RGB8; 
    enc_ctx->width = dec_ctx->width; 
    enc_ctx->height = dec_ctx->height; 
    enc_ctx->time_base = (AVRational){1, 25}; 

    avformat_init_output(out_ctx, NULL);

    if (!(out_fmt->flags & AVFMT_NOFILE)) {
        if ((ret = avio_open(&out_ctx->pb, "output.gif", AVIO_FLAG_WRITE)) < 0) {
            fprintf(stderr, "Could not open output file\n");
            return ret;
        }
    }

    avformat_write_header(out_ctx, NULL);

    AVFrame *frame = av_frame_alloc();
    AVPacket pkt;
    int frame_count = 0;

    while (av_read_frame(fmt_ctx, &pkt) >= 0) {
        avcodec_send_packet(dec_ctx, &pkt);
        while (avcodec_receive_frame(dec_ctx, frame) == 0) {
            avcodec_send_frame(enc_ctx, frame);
            while (avcodec_receive_packet(enc_ctx, &pkt) == 0) {
                pkt.stream_index = stream->index;
                av_interleaved_write_frame(out_ctx, &pkt);
                av_packet_unref(&pkt);
            }

            frame_count++;
            printf("Encoded frame %d\n", frame_count);
        }
        av_packet_unref(&pkt);
    }

    av_write_trailer(out_ctx);

    avcodec_close(enc_ctx);
    avcodec_free_context(&enc_ctx);
    avcodec_close(dec_ctx);
    avcodec_free_context(&dec_ctx);
    av_frame_free(&frame);

    avformat_close_input(&fmt_ctx);
    avformat_free_context(fmt_ctx);
    avio_close(out_ctx->pb);
    avformat_free_context(out_ctx);

    return 0;
}



  


  Belw is shell of compile script for gif :

  


  #!/bin/sh
gcc -o x2gif x2gif.c -L ./output/lib/ -l:libavformat.a -l:libavcodec.a -l:libavutil.a -lz -I ./output/include/


  


  Unfortunately, the compilation did not pass.
How can I troubleshoot and resolve this issue ?

  


  ./output/lib/libavutil.a(lfg.o): In function `av_bmg_get':
/data1/yang/tool/ffmpeg-3.4.4/libavutil/lfg.c:59: undefined reference to `log'
./output/lib/libavutil.a(hwcontext_cuda.o): In function `cuda_free_functions':
/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:175: undefined reference to `dlclose'
./output/lib/libavutil.a(hwcontext_cuda.o): In function `cuda_load_functions':
/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:192: undefined reference to `dlopen'
/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:194: undefined reference to `dlsym'
/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:195: undefined reference to `dlsym'
/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:196: undefined reference to `dlsym'
/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:197: undefined reference to `dlsym'
/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:198: undefined reference to `dlsym'
./output/lib/libavutil.a(hwcontext_cuda.o):/data1/yang/tool/ffmpeg-3.4.4/./compat/cuda/dynlink_loader.h:199: more undefined references to `dlsym' follow
./output/lib/libavutil.a(rational.o): In function `av_d2q':
/data1/yang/tool/ffmpeg-3.4.4/libavutil/rational.c:120: undefined reference to `floor'
./output/lib/libavutil.a(eval.o): In function `eval_expr':
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:184: undefined reference to `exp'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:185: undefined reference to `exp'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:189: undefined reference to `floor'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:190: undefined reference to `ceil'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:191: undefined reference to `trunc'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:192: undefined reference to `round'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:263: undefined reference to `pow'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:300: undefined reference to `floor'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:309: undefined reference to `pow'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:315: undefined reference to `hypot'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:316: undefined reference to `atan2'
./output/lib/libavutil.a(eval.o): In function `ff_exp10':
/data1/yang/tool/ffmpeg-3.4.4/libavutil/ffmath.h:44: undefined reference to `exp2'
./output/lib/libavutil.a(eval.o): In function `parse_primary':
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:417: undefined reference to `sinh'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:418: undefined reference to `cosh'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:419: undefined reference to `tanh'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:420: undefined reference to `sin'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:421: undefined reference to `cos'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:422: undefined reference to `tan'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:423: undefined reference to `atan'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:424: undefined reference to `asin'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:425: undefined reference to `acos'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:426: undefined reference to `exp'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:427: undefined reference to `log'
/data1/yang/tool/ffmpeg-3.4.4/libavutil/eval.c:428: undefined reference to `fabs'


  


• Anomalie #4513 (Fermé) : Undefined au post d’un message de forum public

  6 juillet 2021, par cedric -

  Corrigé par https://git.spip.net/spip/forum/commit/e9a254c4638853e0cde99391adfdebec94c20017 donc