Getting “field has incomplete type” and “conflicting types”

问题

I'm trying build pjsip from source with video support by gcc on ubuntu. After i success full run ./configure and make dep, i run make and i have error below:

../src/pjmedia/ffmpeg_util.c:46:18: error: field ‘codec_id’ has incomplete type
../src/pjmedia/ffmpeg_util.c:148:13: error: conflicting types for ‘pjmedia_format_id_to_CodecID’
../src/pjmedia/ffmpeg_util.h:23:13: note: previous declaration of ‘pjmedia_format_id_to_CodecID’ was here
../src/pjmedia/ffmpeg_util.c: In function ‘pjmedia_format_id_to_CodecID’:
../src/pjmedia/ffmpeg_util.c:154:35: warning: comparison between pointer and integer [enabled by default]
../src/pjmedia/ffmpeg_util.c:155:6: error: dereferencing pointer to incomplete type
../src/pjmedia/ffmpeg_util.c:155:6: warning: statement with no effect [-Wunused-value]
../src/pjmedia/ffmpeg_util.c:160:5: error: dereferencing pointer to incomplete type
../src/pjmedia/ffmpeg_util.c:160:5: warning: statement with no effect [-Wunused-value]
../src/pjmedia/ffmpeg_util.c: At top level:
../src/pjmedia/ffmpeg_util.c:164:55: error: parameter 1 (‘codec_id’) has incomplete type

Here is the code in ffmpeg_util.h and ffmpeg_util.c

ffmpeg_util.h

#ifndef __PJMEDIA_FFMPEG_UTIL_H__
#define __PJMEDIA_FFMPEG_UTIL_H__

#include <pjmedia/format.h>

#ifdef _MSC_VER
#   ifndef __cplusplus
#   define inline _inline
#   endif
#   pragma warning(disable:4244) /* possible loss of data */
#endif

#include <libavutil/avutil.h>
#include <libavcodec/avcodec.h>

void pjmedia_ffmpeg_add_ref();
void pjmedia_ffmpeg_dec_ref();

pj_status_t pjmedia_format_id_to_PixelFormat(pjmedia_format_id fmt_id,
                         enum PixelFormat *pixel_format);

pj_status_t PixelFormat_to_pjmedia_format_id(enum PixelFormat pf,
                         pjmedia_format_id *fmt_id);

pj_status_t pjmedia_format_id_to_CodecID(pjmedia_format_id fmt_id,
                     enum CodecID *codec_id);

pj_status_t CodecID_to_pjmedia_format_id(enum CodecID codec_id,
                     pjmedia_format_id *fmt_id);

#endif /* __PJMEDIA_FFMPEG_UTIL_H__ */

ffmpeg_util.c

#include <pjmedia/types.h>
#include <pj/errno.h>
#include <pj/log.h>
#include <pj/string.h>

#if PJMEDIA_HAS_LIBAVFORMAT && PJMEDIA_HAS_LIBAVUTIL

#include "ffmpeg_util.h"
#include <libavformat/avformat.h>

#define MAKE_VER(mj,mn,mi)  ((mj << 16) | (mn << 8) | (mi << 0))
#define VER_AT_LEAST(mj,mn,mi)  (MAKE_VER(LIBAVUTIL_VERSION_MAJOR, \
                                          LIBAVUTIL_VERSION_MINOR, \
                                          LIBAVUTIL_VERSION_MICRO) >= \
                                 MAKE_VER(mj,mn,mi))



/* Conversion table between pjmedia_format_id and PixelFormat */
static const struct ffmpeg_fmt_table_t
{
    pjmedia_format_id   id;
    enum PixelFormat    pf;
} ffmpeg_fmt_table[] =
{
    { PJMEDIA_FORMAT_RGBA, PIX_FMT_RGBA},
    { PJMEDIA_FORMAT_RGB24,PIX_FMT_BGR24},
    { PJMEDIA_FORMAT_BGRA, PIX_FMT_BGRA},
#if VER_AT_LEAST(51,20,1)
    { PJMEDIA_FORMAT_GBRP, PIX_FMT_GBR24P},
#endif

    { PJMEDIA_FORMAT_AYUV, PIX_FMT_NONE},
    { PJMEDIA_FORMAT_YUY2, PIX_FMT_YUYV422},
    { PJMEDIA_FORMAT_UYVY, PIX_FMT_UYVY422},
    { PJMEDIA_FORMAT_I420, PIX_FMT_YUV420P},
    //{ PJMEDIA_FORMAT_YV12, PIX_FMT_YUV420P},
    { PJMEDIA_FORMAT_I422, PIX_FMT_YUV422P},
    { PJMEDIA_FORMAT_I420JPEG, PIX_FMT_YUVJ420P},
    { PJMEDIA_FORMAT_I422JPEG, PIX_FMT_YUVJ422P},
};

/* Conversion table between pjmedia_format_id and CodecID */
static const struct ffmpeg_codec_table_t
{
    pjmedia_format_id   id;
    enum CodecID    codec_id;
} ffmpeg_codec_table[] =
{
    {PJMEDIA_FORMAT_H261,   CODEC_ID_H261},
    {PJMEDIA_FORMAT_H263,   CODEC_ID_H263},
    {PJMEDIA_FORMAT_H263P,  CODEC_ID_H263P},
    {PJMEDIA_FORMAT_H264,   CODEC_ID_H264},
    {PJMEDIA_FORMAT_MPEG1VIDEO, CODEC_ID_MPEG1VIDEO},
    {PJMEDIA_FORMAT_MPEG2VIDEO, CODEC_ID_MPEG2VIDEO},
    {PJMEDIA_FORMAT_MPEG4,  CODEC_ID_MPEG4},
    {PJMEDIA_FORMAT_MJPEG,  CODEC_ID_MJPEG}
};

static int pjmedia_ffmpeg_ref_cnt;

static void ffmpeg_log_cb(void* ptr, int level, const char* fmt, va_list vl);

void pjmedia_ffmpeg_add_ref()
{
    if (pjmedia_ffmpeg_ref_cnt++ == 0) {
    av_log_set_level(AV_LOG_ERROR);
    av_log_set_callback(&ffmpeg_log_cb);
    av_register_all();
    }
}

void pjmedia_ffmpeg_dec_ref()
{
    if (pjmedia_ffmpeg_ref_cnt-- == 1) {
    /* How to shutdown ffmpeg? */
    }

    if (pjmedia_ffmpeg_ref_cnt < 0) pjmedia_ffmpeg_ref_cnt = 0;
}


static void ffmpeg_log_cb(void* ptr, int level, const char* fmt, va_list vl)
{
    const char *LOG_SENDER = "ffmpeg";
    enum { LOG_LEVEL = 5 };
    char buf[100];
    int bufsize = sizeof(buf), len;
    pj_str_t fmt_st;

    /* Custom callback needs to filter log level by itself */
    if (level > av_log_get_level())
    return;

    /* Add original ffmpeg sender to log format */
    if (ptr) {
    AVClass* avc = *(AVClass**)ptr;
    len = pj_ansi_snprintf(buf, bufsize, "%s: ", avc->item_name(ptr));
    bufsize -= len;
    }

    /* Copy original log format */
    len = pj_ansi_strlen(fmt);
    if (len > bufsize-1)
    len = bufsize-1;
    pj_memcpy(buf+sizeof(buf)-bufsize, fmt, len);
    bufsize -= len;

    /* Trim log format */
    pj_strset(&fmt_st, buf, sizeof(buf)-bufsize);
    pj_strrtrim(&fmt_st);
    buf[fmt_st.slen] = '\0';

    pj_log(LOG_SENDER, LOG_LEVEL, buf, vl);
}


pj_status_t pjmedia_format_id_to_PixelFormat(pjmedia_format_id fmt_id,
                         enum PixelFormat *pixel_format)
{
    unsigned i;
    for (i=0; i<PJ_ARRAY_SIZE(ffmpeg_fmt_table); ++i) {
    const struct ffmpeg_fmt_table_t *t = &ffmpeg_fmt_table[i];
    if (t->id==fmt_id && t->pf != PIX_FMT_NONE) {
        *pixel_format = t->pf;
        return PJ_SUCCESS;
    }
    }

    *pixel_format = PIX_FMT_NONE;
    return PJ_ENOTFOUND;
}

pj_status_t PixelFormat_to_pjmedia_format_id(enum PixelFormat pf,
                         pjmedia_format_id *fmt_id)
{
    unsigned i;
    for (i=0; i<PJ_ARRAY_SIZE(ffmpeg_fmt_table); ++i) {
    const struct ffmpeg_fmt_table_t *t = &ffmpeg_fmt_table[i];
    if (t->pf == pf) {
        if (fmt_id) *fmt_id = t->id;
        return PJ_SUCCESS;
    }
    }

    return PJ_ENOTFOUND;
}

pj_status_t pjmedia_format_id_to_CodecID(pjmedia_format_id fmt_id,
                     enum CodecID *codec_id)
{
    unsigned i;
    for (i=0; i<PJ_ARRAY_SIZE(ffmpeg_codec_table); ++i) {
    const struct ffmpeg_codec_table_t *t = &ffmpeg_codec_table[i];
    if (t->id==fmt_id && t->codec_id != PIX_FMT_NONE) {
        *codec_id = t->codec_id;
        return PJ_SUCCESS;
    }
    }

    *codec_id = PIX_FMT_NONE;
    return PJ_ENOTFOUND;
}

pj_status_t CodecID_to_pjmedia_format_id(enum CodecID codec_id,
                     pjmedia_format_id *fmt_id)
{
    unsigned i;
    for (i=0; i<PJ_ARRAY_SIZE(ffmpeg_codec_table); ++i) {
    const struct ffmpeg_codec_table_t *t = &ffmpeg_codec_table[i];
    if (t->codec_id == codec_id) {
        if (fmt_id) *fmt_id = t->id;
        return PJ_SUCCESS;
    }
    }

    return PJ_ENOTFOUND;
}


#ifdef _MSC_VER
#   pragma comment( lib, "avformat.lib")
#   pragma comment( lib, "avutil.lib")
#endif

#endif  /* #if PJMEDIA_HAS_LIBAVFORMAT && PJMEDIA_HAS_LIBAVUTIL */

Help me fix this error!

回答1:

Looks like most of errors you are seeing are rooted in the fact enum CodecID is not found. Not sure where it might be in your source, but this commit discusses renaming it to AVCodecID. Are you sure you have an up-to-date source?

来源：https://stackoverflow.com/questions/19770164/getting-field-has-incomplete-type-and-conflicting-types