static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)
{
    InputStream *ist = s->opaque;
    const enum AVPixelFormat *p;
    int ret;
    for (p = pix_fmts; *p != -1; p++) {
        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p);
        const HWAccel *hwaccel;
        if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
            break;
        hwaccel = get_hwaccel(*p);
        if (!hwaccel ||
            (ist->active_hwaccel_id && ist->active_hwaccel_id != hwaccel->id) ||
            (ist->hwaccel_id != HWACCEL_AUTO && ist->hwaccel_id != hwaccel->id))
            continue;
        ret = hwaccel->init(s);
        if (ret < 0) {
            if (ist->hwaccel_id == hwaccel->id) {
                av_log(NULL, AV_LOG_FATAL,
                       "%s hwaccel requested for input stream #%d:%d, "
                       "but cannot be initialized.\n", hwaccel->name,
                       ist->file_index, ist->st->index);
                exit_program(1);
            }
            continue;
        }
        ist->active_hwaccel_id = hwaccel->id;
        ist->hwaccel_pix_fmt   = *p;
        break;
    }
    return *p;
}
['static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)\n{\n    InputStream *ist = s->opaque;\n    const enum AVPixelFormat *p;\n    int ret;\n    for (p = pix_fmts; *p != -1; p++) {\n        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p);\n        const HWAccel *hwaccel;\n        if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))\n            break;\n        hwaccel = get_hwaccel(*p);\n        if (!hwaccel ||\n            (ist->active_hwaccel_id && ist->active_hwaccel_id != hwaccel->id) ||\n            (ist->hwaccel_id != HWACCEL_AUTO && ist->hwaccel_id != hwaccel->id))\n            continue;\n        ret = hwaccel->init(s);\n        if (ret < 0) {\n            if (ist->hwaccel_id == hwaccel->id) {\n                av_log(NULL, AV_LOG_FATAL,\n                       "%s hwaccel requested for input stream #%d:%d, "\n                       "but cannot be initialized.\\n", hwaccel->name,\n                       ist->file_index, ist->st->index);\n                exit_program(1);\n            }\n            continue;\n        }\n        ist->active_hwaccel_id = hwaccel->id;\n        ist->hwaccel_pix_fmt   = *p;\n        break;\n    }\n    return *p;\n}', 'const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)\n{\n    if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)\n        return NULL;\n    return &av_pix_fmt_descriptors[pix_fmt];\n}']